From b950289736287275307f1b5579d82c3bd2271db9 Mon Sep 17 00:00:00 2001
From: Lars Thorsen <lars@erlang.org>
Date: Thu, 22 Jun 2017 13:13:09 +0200
Subject: [crypto] Add support for loading an alternative Engine

Add support to plug in alternative implementations for
some or all of the cryptographic operations supported by
the OpenSSL Engine API.
When configured appropriately, OpenSSL calls the engine's
implementation of these operations instead of its own.
---
 lib/crypto/c_src/Makefile.in       |  25 +-
 lib/crypto/c_src/crypto.c          | 790 +++++++++++++++++++++++++++++++++++--
 lib/crypto/c_src/otp_test_engine.c | 177 +++++++++
 lib/crypto/doc/src/Makefile        |  18 +-
 lib/crypto/doc/src/crypto.xml      | 165 ++++++--
 lib/crypto/doc/src/engine_load.xml | 110 ++++++
 lib/crypto/doc/src/usersguide.xml  |   6 +-
 lib/crypto/src/Makefile            |  18 +-
 lib/crypto/src/crypto.erl          | 261 +++++++++++-
 lib/crypto/test/Makefile           |   7 +-
 lib/crypto/test/crypto_SUITE.erl   |   2 +-
 lib/crypto/test/engine_SUITE.erl   | 312 +++++++++++++++
 12 files changed, 1782 insertions(+), 109 deletions(-)
 create mode 100644 lib/crypto/c_src/otp_test_engine.c
 create mode 100644 lib/crypto/doc/src/engine_load.xml
 create mode 100644 lib/crypto/test/engine_SUITE.erl

diff --git a/lib/crypto/c_src/Makefile.in b/lib/crypto/c_src/Makefile.in
index af7c209c75..31124ba477 100644
--- a/lib/crypto/c_src/Makefile.in
+++ b/lib/crypto/c_src/Makefile.in
@@ -1,7 +1,7 @@
 #
 # %CopyrightBegin%
 #
-# Copyright Ericsson AB 1999-2016. All Rights Reserved.
+# Copyright Ericsson AB 1999-2017. All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -78,12 +78,16 @@ CRYPTO_STATIC_OBJS = $(OBJDIR)/crypto_static$(TYPEMARKER).o\
 
 NIF_ARCHIVE = $(LIBDIR)/crypto$(TYPEMARKER).a
 
+TEST_ENGINE_OBJS = $(OBJDIR)/otp_test_engine$(TYPEMARKER).o
+
 ifeq ($(findstring win32,$(TARGET)), win32)
 NIF_LIB = $(LIBDIR)/crypto$(TYPEMARKER).dll
 CALLBACK_LIB = $(LIBDIR)/crypto_callback$(TYPEMARKER).dll
+TEST_ENGINE_LIB = $(LIBDIR)/otp_test_engine$(TYPEMARKER).dll
 else
 NIF_LIB = $(LIBDIR)/crypto$(TYPEMARKER).so
 CALLBACK_LIB = $(LIBDIR)/crypto_callback$(TYPEMARKER).so
+TEST_ENGINE_LIB = $(LIBDIR)/otp_test_engine$(TYPEMARKER).so
 endif
 
 ifeq ($(HOST_OS),)
@@ -129,10 +133,22 @@ ALL_STATIC_CFLAGS = $(DED_STATIC_CFLAGS) $(INCLUDES)
 
 _create_dirs := $(shell mkdir -p $(OBJDIR) $(LIBDIR))
 
-debug opt valgrind: $(NIF_LIB) $(CALLBACK_LIB)
+debug opt valgrind: $(NIF_LIB) $(CALLBACK_LIB) $(TEST_ENGINE_LIB) 
 
 static_lib: $(NIF_ARCHIVE)
 
+$(OBJDIR)/otp_test_engine$(TYPEMARKER).o: otp_test_engine.c
+	$(V_at)$(INSTALL_DIR) $(OBJDIR)
+	$(V_CC) -c -o $@ $(ALL_CFLAGS) $<
+
+$(LIBDIR)/otp_test_engine$(TYPEMARKER).so: $(TEST_ENGINE_OBJS)
+	$(V_at)$(INSTALL_DIR) $(LIBDIR)
+	$(V_LD) $(LDFLAGS) -o $@ $^ $(LDLIBS) $(CRYPTO_LINK_LIB)
+
+$(LIBDIR)/otp_test_engine$(TYPEMARKER).dll: $(TEST_ENGINE_OBJS)
+	$(V_at)$(INSTALL_DIR) $(LIBDIR)
+	$(V_LD) $(LDFLAGS) -o $@  $(SSL_DED_LD_RUNTIME_LIBRARY_PATH) -L$(SSL_LIBDIR) $(TEST_ENGINE_OBJS) -l$(SSL_CRYPTO_LIBNAME) -l$(SSL_SSL_LIBNAME)
+
 $(OBJDIR)/%$(TYPEMARKER).o: %.c
 	$(V_at)$(INSTALL_DIR) $(OBJDIR)
 	$(V_CC) -c -o $@ $(ALL_CFLAGS) $<
@@ -170,6 +186,7 @@ ifeq ($(findstring win32,$(TARGET)), win32)
 	rm -f $(LIBDIR)/crypto.debug.dll
 	rm -f $(LIBDIR)/crypto_callback.dll
 	rm -f $(LIBDIR)/crypto_callback.debug.dll
+	rm -f $(LIBDIR)/otp_test_engine.dll
 else
 	rm -f $(LIBDIR)/crypto.so
 	rm -f $(LIBDIR)/crypto.debug.so
@@ -177,6 +194,7 @@ else
 	rm -f $(LIBDIR)/crypto_callback.so
 	rm -f $(LIBDIR)/crypto_callback.debug.so
 	rm -f $(LIBDIR)/crypto_callback.valgrind.so
+	rm -f $(LIBDIR)/otp_test_engine.so
 endif
 	rm -f $(OBJDIR)/crypto.o
 	rm -f $(OBJDIR)/crypto_static.o
@@ -187,6 +205,7 @@ endif
 	rm -f $(OBJDIR)/crypto_callback.o
 	rm -f $(OBJDIR)/crypto_callback.debug.o
 	rm -f $(OBJDIR)/crypto_callback.valgrind.o
+	rm -f $(OBJDIR)/otp_test_engine.o
 	rm -f core *~
 
 docs:
@@ -206,6 +225,8 @@ ifeq ($(DYNAMIC_CRYPTO_LIB),yes)
 	$(INSTALL_PROGRAM) $(CALLBACK_OBJS) "$(RELSYSDIR)/priv/obj"
 	$(INSTALL_PROGRAM) $(CALLBACK_LIB) "$(RELSYSDIR)/priv/lib"
 endif
+	$(INSTALL_PROGRAM) $(TEST_ENGINE_OBJS) "$(RELSYSDIR)/priv/obj"
+	$(INSTALL_PROGRAM) $(TEST_ENGINE_LIB) "$(RELSYSDIR)/priv/lib"
 
 release_docs_spec:
 
diff --git a/lib/crypto/c_src/crypto.c b/lib/crypto/c_src/crypto.c
index c4e80e3153..0f07a862d2 100644
--- a/lib/crypto/c_src/crypto.c
+++ b/lib/crypto/c_src/crypto.c
@@ -1,4 +1,4 @@
-/* 
+/*
  * %CopyrightBegin%
  *
  * Copyright Ericsson AB 2010-2017. All Rights Reserved.
@@ -19,8 +19,8 @@
  */
 
 /*
- * Purpose:  Dynamically loadable NIF library for cryptography. 
- * Based on OpenSSL. 
+ * Purpose:  Dynamically loadable NIF library for cryptography.
+ * Based on OpenSSL.
  */
 
 #ifdef __WIN32__
@@ -60,6 +60,8 @@
 #include <openssl/rand.h>
 #include <openssl/evp.h>
 #include <openssl/hmac.h>
+#include <openssl/engine.h>
+#include <openssl/err.h>
 
 /* Helper macro to construct a OPENSSL_VERSION_NUMBER.
  * See openssl/opensslv.h
@@ -79,9 +81,9 @@
  *
  * Therefor works tests like this as intendend:
  *     OPENSSL_VERSION_NUMBER >= PACKED_OPENSSL_VERSION_PLAIN(1,0,0)
- * (The test is for example "2.4.2" >= "1.0.0" although the test 
+ * (The test is for example "2.4.2" >= "1.0.0" although the test
  *  with the cloned OpenSSL test would be "1.0.1" >= "1.0.0")
- *     
+ *
  * But tests like this gives wrong result:
  *     OPENSSL_VERSION_NUMBER < PACKED_OPENSSL_VERSION_PLAIN(1,1,0)
  * (The test is false since "2.4.2" < "1.1.0".  It should have been
@@ -119,6 +121,10 @@
 #include <openssl/modes.h>
 #endif
 
+#if OPENSSL_VERSION_NUMBER >= PACKED_OPENSSL_VERSION(0,9,8,'h')
+#define HAS_ENGINE_SUPPORT
+#endif
+
 #include "crypto_callback.h"
 
 #if OPENSSL_VERSION_NUMBER >= PACKED_OPENSSL_VERSION_PLAIN(0,9,8)	\
@@ -240,7 +246,7 @@
 
 /* This shall correspond to the similar macro in crypto.erl */
 /* Current value is: erlang:system_info(context_reductions) * 10 */
-#define MAX_BYTES_TO_NIF 20000 
+#define MAX_BYTES_TO_NIF 20000
 
 #define CONSUME_REDS(NifEnv, Ibin)			\
 do {							\
@@ -466,6 +472,22 @@ static ERL_NIF_TERM aes_gcm_decrypt_NO_EVP(ErlNifEnv* env, int argc, const ERL_N
 static ERL_NIF_TERM chacha20_poly1305_encrypt(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
 static ERL_NIF_TERM chacha20_poly1305_decrypt(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
 
+static int get_engine_load_cmd_list(ErlNifEnv* env, const ERL_NIF_TERM term, char **cmds, int i);
+static ERL_NIF_TERM engine_by_id_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
+static ERL_NIF_TERM engine_init_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
+static ERL_NIF_TERM engine_finish_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
+static ERL_NIF_TERM engine_free_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
+static ERL_NIF_TERM engine_load_dynamic_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
+static ERL_NIF_TERM engine_ctrl_cmd_strings_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
+static ERL_NIF_TERM engine_register_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
+static ERL_NIF_TERM engine_unregister_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
+static ERL_NIF_TERM engine_add_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
+static ERL_NIF_TERM engine_remove_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
+static ERL_NIF_TERM engine_get_first_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
+static ERL_NIF_TERM engine_get_next_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
+static ERL_NIF_TERM engine_get_id_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
+static ERL_NIF_TERM engine_get_all_methods_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
+
 /* helpers */
 static void init_algorithms_types(ErlNifEnv*);
 static void init_digest_types(ErlNifEnv* env);
@@ -529,12 +551,27 @@ static ErlNifFunc nif_funcs[] = {
     {"aes_gcm_decrypt", 5, aes_gcm_decrypt},
 
     {"chacha20_poly1305_encrypt", 4, chacha20_poly1305_encrypt},
-    {"chacha20_poly1305_decrypt", 5, chacha20_poly1305_decrypt}
+    {"chacha20_poly1305_decrypt", 5, chacha20_poly1305_decrypt},
+
+    {"engine_by_id_nif", 1, engine_by_id_nif},
+    {"engine_init_nif", 1, engine_init_nif},
+    {"engine_finish_nif", 1, engine_finish_nif},
+    {"engine_free_nif", 1, engine_free_nif},
+    {"engine_load_dynamic_nif", 0, engine_load_dynamic_nif},
+    {"engine_ctrl_cmd_strings_nif", 2, engine_ctrl_cmd_strings_nif},
+    {"engine_register_nif", 2, engine_register_nif},
+    {"engine_unregister_nif", 2, engine_unregister_nif},
+    {"engine_add_nif", 1, engine_add_nif},
+    {"engine_remove_nif", 1, engine_remove_nif},
+    {"engine_get_first_nif", 0, engine_get_first_nif},
+    {"engine_get_next_nif", 1, engine_get_next_nif},
+    {"engine_get_id_nif", 1, engine_get_id_nif},
+    {"engine_get_all_methods_nif", 0, engine_get_all_methods_nif}
+
 };
 
 ERL_NIF_INIT(crypto,nif_funcs,load,NULL,upgrade,unload)
 
-
 #define MD5_CTX_LEN       (sizeof(MD5_CTX))
 #define MD4_CTX_LEN       (sizeof(MD4_CTX))
 #define RIPEMD160_CTX_LEN (sizeof(RIPEMD160_CTX))
@@ -603,8 +640,30 @@ static ERL_NIF_TERM atom_sha512;
 static ERL_NIF_TERM atom_md5;
 static ERL_NIF_TERM atom_ripemd160;
 
-
-
+#ifdef HAS_ENGINE_SUPPORT
+static ERL_NIF_TERM atom_bad_engine;
+static ERL_NIF_TERM atom_bad_engine_method;
+static ERL_NIF_TERM atom_bad_engine_id;
+static ERL_NIF_TERM atom_ctrl_cmd_failed;
+static ERL_NIF_TERM atom_engine_init_failed;
+static ERL_NIF_TERM atom_register_engine_failed;
+static ERL_NIF_TERM atom_add_engine_failed;
+static ERL_NIF_TERM atom_remove_engine_failed;
+static ERL_NIF_TERM atom_engine_method_not_supported;
+
+static ERL_NIF_TERM atom_engine_method_rsa;
+static ERL_NIF_TERM atom_engine_method_dsa;
+static ERL_NIF_TERM atom_engine_method_dh;
+static ERL_NIF_TERM atom_engine_method_rand;
+static ERL_NIF_TERM atom_engine_method_ecdh;
+static ERL_NIF_TERM atom_engine_method_ecdsa;
+static ERL_NIF_TERM atom_engine_method_ciphers;
+static ERL_NIF_TERM atom_engine_method_digests;
+static ERL_NIF_TERM atom_engine_method_store;
+static ERL_NIF_TERM atom_engine_method_pkey_meths;
+static ERL_NIF_TERM atom_engine_method_pkey_asn1_meths;
+static ERL_NIF_TERM atom_engine_method_ec;
+#endif
 static ErlNifResourceType* hmac_context_rtype;
 struct hmac_context
 {
@@ -728,11 +787,13 @@ static struct cipher_type_t cipher_types[] =
 
 static struct cipher_type_t* get_cipher_type(ERL_NIF_TERM type, size_t key_len);
 
+
 /*
 #define PRINTF_ERR0(FMT) enif_fprintf(stderr, FMT "\n")
 #define PRINTF_ERR1(FMT, A1) enif_fprintf(stderr, FMT "\n", A1)
 #define PRINTF_ERR2(FMT, A1, A2) enif_fprintf(stderr, FMT "\n", A1, A2)
 */
+
 #define PRINTF_ERR0(FMT)
 #define PRINTF_ERR1(FMT,A1)
 #define PRINTF_ERR2(FMT,A1,A2)
@@ -758,6 +819,23 @@ static void evp_cipher_ctx_dtor(ErlNifEnv* env, struct evp_cipher_ctx* ctx) {
 }
 #endif
 
+// Engine
+#ifdef HAS_ENGINE_SUPPORT
+static ErlNifResourceType* engine_ctx_rtype;
+struct engine_ctx {
+    ENGINE *engine;
+    char *id;
+};
+static void engine_ctx_dtor(ErlNifEnv* env, struct engine_ctx* ctx) {
+    PRINTF_ERR0("engine_ctx_dtor");
+    if(ctx->id) {
+        PRINTF_ERR1("  non empty ctx->id=%s", ctx->id);
+        enif_free(ctx->id);
+    } else
+         PRINTF_ERR0("  empty ctx->id=NULL");
+}
+#endif
+
 static int verify_lib_version(void)
 {
     const unsigned long libv = SSLeay();
@@ -793,7 +871,7 @@ static char crypto_callback_name[] = "crypto_callback";
 static int change_basename(ErlNifBinary* bin, char* buf, int bufsz, const char* newfile)
 {
     int i;
-    
+
     for (i = bin->size; i > 0; i--) {
 	if (bin->data[i-1] == '/')
 	    break;
@@ -869,12 +947,23 @@ static int initialize(ErlNifEnv* env, ERL_NIF_TERM load_info)
         return __LINE__;
     }
 #endif
+#ifdef HAS_ENGINE_SUPPORT
+    engine_ctx_rtype = enif_open_resource_type(env, NULL, "ENGINE_CTX",
+                                                   (ErlNifResourceDtor*) engine_ctx_dtor,
+                                                   ERL_NIF_RT_CREATE|ERL_NIF_RT_TAKEOVER,
+                                                   NULL);
+    if (!engine_ctx_rtype) {
+        PRINTF_ERR0("CRYPTO: Could not open resource type 'ENGINE_CTX'");
+        return __LINE__;
+    }
+
     if (library_refc > 0) {
 	/* Repeated loading of this library (module upgrade).
 	 * Atoms and callbacks are already set, we are done.
 	 */
 	return 0;
     }
+#endif 
 
     atom_true  = enif_make_atom(env,"true");
     atom_false = enif_make_atom(env,"false");
@@ -952,6 +1041,30 @@ static int initialize(ErlNifEnv* env, ERL_NIF_TERM load_info)
     atom_md5 = enif_make_atom(env,"md5");
     atom_ripemd160 = enif_make_atom(env,"ripemd160");
 
+#ifdef HAS_ENGINE_SUPPORT
+    atom_bad_engine = enif_make_atom(env,"bad_engine");
+    atom_bad_engine_method = enif_make_atom(env,"bad_engine_method");
+    atom_bad_engine_id = enif_make_atom(env,"bad_engine_id");
+    atom_ctrl_cmd_failed = enif_make_atom(env,"ctrl_cmd_failed");
+    atom_engine_init_failed = enif_make_atom(env,"engine_init_failed");
+    atom_engine_method_not_supported = enif_make_atom(env,"engine_method_not_supported");
+    atom_add_engine_failed = enif_make_atom(env,"add_engine_failed");
+    atom_remove_engine_failed = enif_make_atom(env,"remove_engine_failed");
+
+    atom_engine_method_rsa = enif_make_atom(env,"engine_method_rsa");
+    atom_engine_method_dsa = enif_make_atom(env,"engine_method_dsa");
+    atom_engine_method_dh = enif_make_atom(env,"engine_method_dh");
+    atom_engine_method_rand = enif_make_atom(env,"engine_method_rand");
+    atom_engine_method_ecdh = enif_make_atom(env,"engine_method_ecdh");
+    atom_engine_method_ecdsa = enif_make_atom(env,"engine_method_ecdsa");
+    atom_engine_method_store = enif_make_atom(env,"engine_method_store");
+    atom_engine_method_ciphers = enif_make_atom(env,"engine_method_ciphers");
+    atom_engine_method_digests = enif_make_atom(env,"engine_method_digests");
+    atom_engine_method_pkey_meths = enif_make_atom(env,"engine_method_pkey_meths");
+    atom_engine_method_pkey_asn1_meths = enif_make_atom(env,"engine_method_pkey_asn1_meths");
+    atom_engine_method_ec = enif_make_atom(env,"engine_method_ec");
+#endif
+
     init_digest_types(env);
     init_cipher_types(env);
     init_algorithms_types(env);
@@ -973,24 +1086,24 @@ static int initialize(ErlNifEnv* env, ERL_NIF_TERM load_info)
 #else /* !HAVE_DYNAMIC_CRYPTO_LIB */
     funcp = &get_crypto_callbacks;
 #endif
-    
+
 #ifdef OPENSSL_THREADS
     enif_system_info(&sys_info, sizeof(sys_info));
     if (sys_info.scheduler_threads > 1) {
-	nlocks = CRYPTO_num_locks(); 
+	nlocks = CRYPTO_num_locks();
     }
     /* else no need for locks */
 #endif
-    
+
     ccb = (*funcp)(nlocks);
-    
+
     if (!ccb || ccb->sizeof_me != sizeof(*ccb)) {
 	PRINTF_ERR0("Invalid 'crypto_callbacks'");
 	return __LINE__;
     }
-    
+
     CRYPTO_set_mem_functions(ccb->crypto_alloc, ccb->crypto_realloc, ccb->crypto_free);
-    
+
 #ifdef OPENSSL_THREADS
     if (nlocks > 0) {
 	CRYPTO_set_locking_callback(ccb->locking_function);
@@ -1186,11 +1299,11 @@ static ERL_NIF_TERM info_lib(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]
      * Version string is still from library though.
      */
 
-    memcpy(enif_make_new_binary(env, name_sz, &name_term), libname, name_sz);    
+    memcpy(enif_make_new_binary(env, name_sz, &name_term), libname, name_sz);
     memcpy(enif_make_new_binary(env, ver_sz, &ver_term), ver, ver_sz);
 
     return enif_make_list1(env, enif_make_tuple3(env, name_term,
-						 enif_make_int(env, ver_num),						 
+						 enif_make_int(env, ver_num),
 						 ver_term));
 }
 
@@ -1225,6 +1338,8 @@ static ERL_NIF_TERM enable_fips_mode(ErlNifEnv* env, int argc, const ERL_NIF_TER
     }
 }
 
+
+#if defined(HAVE_EC)
 static ERL_NIF_TERM make_badarg_maybe(ErlNifEnv* env)
 {
     ERL_NIF_TERM reason;
@@ -1233,6 +1348,7 @@ static ERL_NIF_TERM make_badarg_maybe(ErlNifEnv* env)
     else
 	return enif_make_badarg(env);
 }
+#endif
 
 static ERL_NIF_TERM hash_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
 {/* (Type, Data) */
@@ -1668,7 +1784,7 @@ static ERL_NIF_TERM hmac_update_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM
 {/* (Context, Data) */
     ErlNifBinary data;
     struct hmac_context* obj;
-    
+
     if (!enif_get_resource(env, argv[0], hmac_context_rtype, (void**)&obj)
 	|| !enif_inspect_iolist_as_binary(env, argv[1], &data)) {
 	return enif_make_badarg(env);
@@ -1704,13 +1820,13 @@ static ERL_NIF_TERM hmac_final_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM
 	enif_mutex_unlock(obj->mtx);
 	return enif_make_badarg(env);
     }
-    
+
     HMAC_Final(obj->ctx, mac_buf, &mac_len);
     HMAC_CTX_free(obj->ctx);
     obj->alive = 0;
     enif_mutex_unlock(obj->mtx);
 
-    if (argc == 2 && req_len < mac_len) { 
+    if (argc == 2 && req_len < mac_len) {
         /* Only truncate to req_len bytes if asked. */
         mac_len = req_len;
     }
@@ -2021,7 +2137,7 @@ static ERL_NIF_TERM aes_ctr_stream_init(ErlNifEnv* env, int argc, const ERL_NIF_
 }
 
 static ERL_NIF_TERM aes_ctr_stream_encrypt(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
-{/* ({Key, IVec, ECount, Num}, Data) */    
+{/* ({Key, IVec, ECount, Num}, Data) */
     ErlNifBinary key_bin, ivec_bin, text_bin, ecount_bin;
     AES_KEY aes_key;
     unsigned int num;
@@ -2042,14 +2158,14 @@ static ERL_NIF_TERM aes_ctr_stream_encrypt(ErlNifEnv* env, int argc, const ERL_N
         return enif_make_badarg(env);
     }
 
-    ivec2_buf = enif_make_new_binary(env, ivec_bin.size, &ivec2_term); 
+    ivec2_buf = enif_make_new_binary(env, ivec_bin.size, &ivec2_term);
     ecount2_buf = enif_make_new_binary(env, ecount_bin.size, &ecount2_term);
-    
+
     memcpy(ivec2_buf, ivec_bin.data, 16);
     memcpy(ecount2_buf, ecount_bin.data, ecount_bin.size);
 
     AES_ctr128_encrypt((unsigned char *) text_bin.data,
-		       enif_make_new_binary(env, text_bin.size, &cipher_term), 
+		       enif_make_new_binary(env, text_bin.size, &cipher_term),
 		       text_bin.size, &aes_key, ivec2_buf, ecount2_buf, &num);
 
     num2_term = enif_make_uint(env, num);
@@ -2352,7 +2468,7 @@ out_err:
 }
 
 static ERL_NIF_TERM strong_rand_bytes_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
-{/* (Bytes) */     
+{/* (Bytes) */
     unsigned bytes;
     unsigned char* data;
     ERL_NIF_TERM ret;
@@ -2446,7 +2562,7 @@ static ERL_NIF_TERM rand_uniform_nif(ErlNifEnv* env, int argc, const ERL_NIF_TER
 
     bn_to = BN_new();
     BN_sub(bn_to, bn_rand, bn_from);
-    BN_pseudo_rand_range(bn_rand, bn_to);      
+    BN_pseudo_rand_range(bn_rand, bn_to);
     BN_add(bn_rand, bn_rand, bn_from);
     dlen = BN_num_bytes(bn_rand);
     data = enif_make_new_binary(env, dlen+4, &ret);
@@ -2464,7 +2580,7 @@ static ERL_NIF_TERM mod_exp_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM arg
     BIGNUM *bn_base=NULL, *bn_exponent=NULL, *bn_modulo=NULL, *bn_result;
     BN_CTX *bn_ctx;
     unsigned char* ptr;
-    unsigned dlen;      
+    unsigned dlen;
     unsigned bin_hdr; /* return type: 0=plain binary, 4: mpint */
     unsigned extra_byte;
     ERL_NIF_TERM ret;
@@ -2485,7 +2601,7 @@ static ERL_NIF_TERM mod_exp_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM arg
     dlen = BN_num_bytes(bn_result);
     extra_byte = bin_hdr && BN_is_bit_set(bn_result, dlen*8-1);
     ptr = enif_make_new_binary(env, bin_hdr+extra_byte+dlen, &ret);
-    if (bin_hdr) {	
+    if (bin_hdr) {
 	put_int32(ptr, extra_byte+dlen);
 	ptr[4] = 0; /* extra zeroed byte to ensure a positive mpint */
 	ptr += bin_hdr + extra_byte;
@@ -2545,6 +2661,7 @@ static struct cipher_type_t* get_cipher_type(ERL_NIF_TERM type, size_t key_len)
     return NULL;
 }
 
+
 static ERL_NIF_TERM do_exor(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
 {/* (Data1, Data2) */
     ErlNifBinary d1, d2;
@@ -2578,7 +2695,7 @@ static ERL_NIF_TERM rc4_set_key(ErlNifEnv* env, int argc, const ERL_NIF_TERM arg
 	return enif_make_badarg(env);
     }
     RC4_set_key((RC4_KEY*)enif_make_new_binary(env, sizeof(RC4_KEY), &ret),
-		key.size, key.data);        
+		key.size, key.data);
     return ret;
 #else
     return enif_raise_exception(env, atom_notsup);
@@ -2871,7 +2988,7 @@ static ERL_NIF_TERM dh_generate_parameters_nif(ErlNifEnv* env, int argc, const E
     BN_bn2bin(dh_g, g_ptr);
     ERL_VALGRIND_MAKE_MEM_DEFINED(p_ptr, p_len);
     ERL_VALGRIND_MAKE_MEM_DEFINED(g_ptr, g_len);
-    return enif_make_list2(env, ret_p, ret_g);    
+    return enif_make_list2(env, ret_p, ret_g);
 }
 
 static ERL_NIF_TERM dh_check(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
@@ -2881,9 +2998,9 @@ static ERL_NIF_TERM dh_check(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]
     ERL_NIF_TERM ret, head, tail;
     BIGNUM *dh_p, *dh_g;
 
-    if (!enif_get_list_cell(env, argv[0], &head, &tail)   
+    if (!enif_get_list_cell(env, argv[0], &head, &tail)
 	|| !get_bn_from_bin(env, head, &dh_p)
-	|| !enif_get_list_cell(env, tail, &head, &tail)   
+	|| !enif_get_list_cell(env, tail, &head, &tail)
 	|| !get_bn_from_bin(env, head, &dh_g)
 	|| !enif_is_empty_list(env,tail)) {
 
@@ -2900,12 +3017,12 @@ static ERL_NIF_TERM dh_check(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]
 	else if (i & DH_NOT_SUITABLE_GENERATOR)	ret = atom_not_suitable_generator;
 	else ret = enif_make_tuple2(env, atom_unknown, enif_make_uint(env, i));
     }
-    else { /* Check Failed */       
+    else { /* Check Failed */
 	ret = enif_make_tuple2(env, atom_error, atom_check_failed);
     }
     DH_free(dh_params);
     return ret;
-}   
+}
 
 static ERL_NIF_TERM dh_generate_key_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
 {/* (PrivKey|undefined, DHParams=[P,G], Mpint, Len|0) */
@@ -3007,7 +3124,7 @@ static ERL_NIF_TERM dh_compute_key_nif(ErlNifEnv* env, int argc, const ERL_NIF_T
 	i = DH_compute_key(ret_bin.data, other_pub_key, dh_params);
 	if (i > 0) {
 	    if (i != ret_bin.size) {
-		enif_realloc_binary(&ret_bin, i); 
+		enif_realloc_binary(&ret_bin, i);
 	    }
 	    ret = enif_make_binary(env, &ret_bin);
 	}
@@ -3965,7 +4082,7 @@ printf("\r\n");
     }
 
 #ifdef HAS_EVP_PKEY_CTX
-/* printf("EVP interface\r\n"); 
+/* printf("EVP interface\r\n");
  */
     ctx = EVP_PKEY_CTX_new(pkey, NULL);
     if (!ctx) goto badarg;
@@ -4095,7 +4212,7 @@ static ERL_NIF_TERM pkey_verify_nif(ErlNifEnv *env, int argc, const ERL_NIF_TERM
     }
 
 #ifdef HAS_EVP_PKEY_CTX
-/* printf("EVP interface\r\n"); 
+/* printf("EVP interface\r\n");
  */
     ctx = EVP_PKEY_CTX_new(pkey, NULL);
     if (!ctx) goto badarg;
@@ -4554,3 +4671,598 @@ static ERL_NIF_TERM rand_seed_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM a
     RAND_seed(seed_bin.data,seed_bin.size);
     return atom_ok;
 }
+
+/*================================================================*/
+/* Engine */
+/*================================================================*/
+static ERL_NIF_TERM engine_by_id_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
+{/* (EngineId) */
+#ifdef HAS_ENGINE_SUPPORT
+    ERL_NIF_TERM ret;
+    ErlNifBinary engine_id_bin;
+    unsigned int engine_id_len = 0;
+    char *engine_id;
+    ENGINE *engine;
+    struct engine_ctx *ctx;
+
+    // Get Engine Id
+    if(!enif_inspect_binary(env, argv[0], &engine_id_bin)) {
+        PRINTF_ERR0("engine_by_id_nif Leaved: badarg");
+        return enif_make_badarg(env);
+    } else {
+        engine_id_len = engine_id_bin.size+1;
+        engine_id = enif_alloc(engine_id_len);
+        (void) memcpy(engine_id, engine_id_bin.data, engine_id_len);
+        engine_id[engine_id_len-1] = '\0';
+    }
+
+    engine = ENGINE_by_id(engine_id);
+    if(!engine) {
+        PRINTF_ERR0("engine_by_id_nif Leaved: {error, bad_engine_id}");
+        return enif_make_tuple2(env, atom_error, atom_bad_engine_id);
+    }
+
+    ctx = enif_alloc_resource(engine_ctx_rtype, sizeof(struct engine_ctx));
+    ctx->engine = engine;
+    ctx->id = engine_id;
+
+    ret = enif_make_resource(env, ctx);
+    enif_release_resource(ctx);
+
+    return enif_make_tuple2(env, atom_ok, ret);
+#else
+    return atom_notsup;
+#endif
+}
+
+static ERL_NIF_TERM engine_init_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
+{/* (Engine) */
+#ifdef HAS_ENGINE_SUPPORT
+    ERL_NIF_TERM ret = atom_ok;
+    struct engine_ctx *ctx;
+
+    // Get Engine
+    if (!enif_get_resource(env, argv[0], engine_ctx_rtype, (void**)&ctx)) {
+        PRINTF_ERR0("engine_init_nif Leaved: Parameter not an engine resource object");
+        return enif_make_badarg(env);
+    }
+    if (!ENGINE_init(ctx->engine)) {
+        //ERR_print_errors_fp(stderr);
+        PRINTF_ERR0("engine_init_nif Leaved: {error, engine_init_failed}");
+        return enif_make_tuple2(env, atom_error, atom_engine_init_failed);
+    }
+
+    return ret;
+#else
+    return atom_notsup;
+#endif
+}
+
+static ERL_NIF_TERM engine_free_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
+{/* (Engine) */
+#ifdef HAS_ENGINE_SUPPORT
+    struct engine_ctx *ctx;
+
+    // Get Engine
+    if (!enif_get_resource(env, argv[0], engine_ctx_rtype, (void**)&ctx)) {
+        PRINTF_ERR0("engine_free_nif Leaved: Parameter not an engine resource object");
+        return enif_make_badarg(env);
+    }
+
+    ENGINE_free(ctx->engine);
+    return atom_ok;
+#else
+    return atom_notsup;
+#endif
+}
+
+static ERL_NIF_TERM engine_finish_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
+{/* (Engine) */
+#ifdef HAS_ENGINE_SUPPORT
+    struct engine_ctx *ctx;
+
+    // Get Engine
+    if (!enif_get_resource(env, argv[0], engine_ctx_rtype, (void**)&ctx)) {
+        PRINTF_ERR0("engine_finish_nif Leaved: Parameter not an engine resource object");
+        return enif_make_badarg(env);
+    }
+
+    ENGINE_finish(ctx->engine);
+    return atom_ok;
+#else
+    return atom_notsup;
+#endif
+}
+
+static ERL_NIF_TERM engine_load_dynamic_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
+{/* () */
+#ifdef HAS_ENGINE_SUPPORT
+    ENGINE_load_dynamic();
+    return atom_ok;
+#else
+    return atom_notsup;
+#endif
+}
+
+static ERL_NIF_TERM engine_ctrl_cmd_strings_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
+{/* (Engine, Commands) */
+#ifdef HAS_ENGINE_SUPPORT
+    ERL_NIF_TERM ret = atom_ok;
+    unsigned int cmds_len = 0;
+    char **cmds = NULL;
+    struct engine_ctx *ctx;
+    int i;
+
+    // Get Engine
+    if (!enif_get_resource(env, argv[0], engine_ctx_rtype, (void**)&ctx)) {
+        PRINTF_ERR0("engine_ctrl_cmd_strings_nif Leaved: Parameter not an engine resource object");
+        return enif_make_badarg(env);
+    }
+
+    PRINTF_ERR1("Engine Id:  %s\r\n", ENGINE_get_id(ctx->engine));
+
+    // Get Command List
+    if(!enif_get_list_length(env, argv[1], &cmds_len)) {
+        PRINTF_ERR0("engine_ctrl_cmd_strings_nif Leaved: Bad Command List");
+        return enif_make_badarg(env);
+    } else {
+        cmds_len *= 2; // Key-Value list from erlang
+        cmds = enif_alloc((cmds_len+1)*sizeof(char*));
+        if(get_engine_load_cmd_list(env, argv[1], cmds, 0)) {
+            PRINTF_ERR0("engine_ctrl_cmd_strings_nif Leaved: Couldn't read Command List");
+            ret = enif_make_badarg(env);
+            goto error;
+        }
+    }
+
+    for(i = 0; i < cmds_len; i+=2) {
+        PRINTF_ERR2("Cmd:  %s:%s\r\n",
+                   cmds[i] ? cmds[i] : "(NULL)",
+                   cmds[i+1] ? cmds[i+1] : "(NULL)");
+        if(!ENGINE_ctrl_cmd_string(ctx->engine, cmds[i], cmds[i+1], 0)) {
+            PRINTF_ERR2("Command failed:  %s:%s\r\n",
+                        cmds[i] ? cmds[i] : "(NULL)",
+                        cmds[i+1] ? cmds[i+1] : "(NULL)");
+            //ENGINE_free(ctx->engine);
+            ret = enif_make_tuple2(env, atom_error, atom_ctrl_cmd_failed);
+            PRINTF_ERR0("engine_ctrl_cmd_strings_nif Leaved: {error, ctrl_cmd_failed}");
+            goto error;
+        }
+}
+
+ error:
+    for(i = 0; cmds != NULL && cmds[i] != NULL; i++)
+        enif_free(cmds[i]);
+    return ret;
+#else
+    return atom_notsup;
+#endif
+}
+
+static ERL_NIF_TERM engine_add_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
+{/* (Engine) */
+#ifdef HAS_ENGINE_SUPPORT
+    struct engine_ctx *ctx;
+
+    // Get Engine
+    if (!enif_get_resource(env, argv[0], engine_ctx_rtype, (void**)&ctx)) {
+        PRINTF_ERR0("engine_add_nif Leaved: Parameter not an engine resource object");
+        return enif_make_badarg(env);
+    }
+
+    if (!ENGINE_add(ctx->engine)) {
+        PRINTF_ERR0("engine_add_nif Leaved: {error, add_engine_failed}");
+        return enif_make_tuple2(env, atom_error, atom_add_engine_failed);
+    }
+    return atom_ok;
+#else
+    return atom_notsup;
+#endif
+}
+
+static ERL_NIF_TERM engine_remove_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
+{/* (Engine) */
+#ifdef HAS_ENGINE_SUPPORT
+    struct engine_ctx *ctx;
+
+    // Get Engine
+    if (!enif_get_resource(env, argv[0], engine_ctx_rtype, (void**)&ctx)) {
+        PRINTF_ERR0("engine_remove_nif Leaved: Parameter not an engine resource object");
+        return enif_make_badarg(env);
+    }
+
+    if (!ENGINE_remove(ctx->engine)) {
+        PRINTF_ERR0("engine_remove_nif Leaved: {error, remove_engine_failed}");
+        return enif_make_tuple2(env, atom_error, atom_remove_engine_failed);
+    }
+    return atom_ok;
+#else
+    return atom_notsup;
+#endif
+}
+
+static ERL_NIF_TERM engine_register_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
+{/* (Engine, EngineMethod) */
+#ifdef HAS_ENGINE_SUPPORT
+    struct engine_ctx *ctx;
+    unsigned int method;
+
+    // Get Engine
+    if (!enif_get_resource(env, argv[0], engine_ctx_rtype, (void**)&ctx)) {
+        PRINTF_ERR0("engine_register_nif Leaved: Parameter not an engine resource object");
+        return enif_make_badarg(env);
+    }
+    // Get Method
+    if (!enif_get_uint(env, argv[1], &method)) {
+        PRINTF_ERR0("engine_register_nif Leaved: Parameter Method not an uint");
+        return enif_make_badarg(env);
+    }
+
+    switch(method)
+    {
+#ifdef ENGINE_METHOD_RSA
+    case ENGINE_METHOD_RSA:
+        if (!ENGINE_register_RSA(ctx->engine))
+            return enif_make_tuple2(env, atom_error, atom_register_engine_failed);
+        break;
+#endif
+#ifdef ENGINE_METHOD_DSA
+    case ENGINE_METHOD_DSA:
+        if (!ENGINE_register_DSA(ctx->engine))
+            return enif_make_tuple2(env, atom_error, atom_register_engine_failed);
+        break;
+#endif
+#ifdef ENGINE_METHOD_DH
+    case ENGINE_METHOD_DH:
+        if (!ENGINE_register_DH(ctx->engine))
+            return enif_make_tuple2(env, atom_error, atom_register_engine_failed);
+        break;
+#endif
+#ifdef ENGINE_METHOD_RAND
+    case ENGINE_METHOD_RAND:
+        if (!ENGINE_register_RAND(ctx->engine))
+            return enif_make_tuple2(env, atom_error, atom_register_engine_failed);
+        break;
+#endif
+#ifdef ENGINE_METHOD_ECDH
+    case ENGINE_METHOD_ECDH:
+        if (!ENGINE_register_ECDH(ctx->engine))
+            return enif_make_tuple2(env, atom_error, atom_register_engine_failed);
+        break;
+#endif
+#ifdef ENGINE_METHOD_ECDSA
+    case ENGINE_METHOD_ECDSA:
+        if (!ENGINE_register_ECDSA(ctx->engine))
+            return enif_make_tuple2(env, atom_error, atom_register_engine_failed);
+        break;
+#endif
+#ifdef ENGINE_METHOD_STORE
+    case ENGINE_METHOD_STORE:
+        if (!ENGINE_register_STORE(ctx->engine))
+            return enif_make_tuple2(env, atom_error, atom_register_engine_failed);
+        break;
+#endif
+#ifdef ENGINE_METHOD_CIPHERS
+    case ENGINE_METHOD_CIPHERS:
+        if (!ENGINE_register_ciphers(ctx->engine))
+            return enif_make_tuple2(env, atom_error, atom_register_engine_failed);
+        break;
+#endif
+#ifdef ENGINE_METHOD_DIGESTS
+    case ENGINE_METHOD_DIGESTS:
+        if (!ENGINE_register_digests(ctx->engine))
+            return enif_make_tuple2(env, atom_error, atom_register_engine_failed);
+        break;
+#endif
+#ifdef ENGINE_METHOD_PKEY_METHS
+    case ENGINE_METHOD_PKEY_METHS:
+        if (!ENGINE_register_pkey_meths(ctx->engine))
+            return enif_make_tuple2(env, atom_error, atom_register_engine_failed);
+        break;
+#endif
+#ifdef ENGINE_METHOD_PKEY_ASN1_METHS
+    case ENGINE_METHOD_PKEY_ASN1_METHS:
+        if (!ENGINE_register_pkey_asn1_meths(ctx->engine))
+            return enif_make_tuple2(env, atom_error, atom_register_engine_failed);
+        break;
+#endif
+#ifdef ENGINE_METHOD_EC
+    case ENGINE_METHOD_EC:
+        if (!ENGINE_register_EC(ctx->engine))
+            return enif_make_tuple2(env, atom_error, atom_register_engine_failed);
+        break;
+#endif
+    default:
+        return  enif_make_tuple2(env, atom_error, atom_engine_method_not_supported);
+        break;
+    }
+    return atom_ok;
+#else
+    return atom_notsup;
+#endif
+}
+
+static ERL_NIF_TERM engine_unregister_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
+{/* (Engine, EngineMethod) */
+#ifdef HAS_ENGINE_SUPPORT
+    struct engine_ctx *ctx;
+    unsigned int method;
+
+    // Get Engine
+    if (!enif_get_resource(env, argv[0], engine_ctx_rtype, (void**)&ctx)) {
+        PRINTF_ERR0("engine_unregister_nif Leaved: Parameter not an engine resource object");
+        return enif_make_badarg(env);
+    }
+    // Get Method
+    if (!enif_get_uint(env, argv[1], &method)) {
+        PRINTF_ERR0("engine_unregister_nif Leaved: Parameter Method not an uint");
+        return enif_make_badarg(env);
+    }
+
+    switch(method)
+    {
+#ifdef ENGINE_METHOD_RSA
+    case ENGINE_METHOD_RSA:
+        ENGINE_unregister_RSA(ctx->engine);
+        break;
+#endif
+#ifdef ENGINE_METHOD_DSA
+    case ENGINE_METHOD_DSA:
+        ENGINE_unregister_DSA(ctx->engine);
+        break;
+#endif
+#ifdef ENGINE_METHOD_DH
+    case ENGINE_METHOD_DH:
+        ENGINE_unregister_DH(ctx->engine);
+        break;
+#endif
+#ifdef ENGINE_METHOD_RAND
+    case ENGINE_METHOD_RAND:
+        ENGINE_unregister_RAND(ctx->engine);
+        break;
+#endif
+#ifdef ENGINE_METHOD_ECDH
+    case ENGINE_METHOD_ECDH:
+        ENGINE_unregister_ECDH(ctx->engine);
+        break;
+#endif
+#ifdef ENGINE_METHOD_ECDSA
+    case ENGINE_METHOD_ECDSA:
+        ENGINE_unregister_ECDSA(ctx->engine);
+        break;
+#endif
+#ifdef ENGINE_METHOD_STORE
+    case ENGINE_METHOD_STORE:
+        ENGINE_unregister_STORE(ctx->engine);
+        break;
+#endif
+#ifdef ENGINE_METHOD_CIPHERS
+    case ENGINE_METHOD_CIPHERS:
+        ENGINE_unregister_ciphers(ctx->engine);
+        break;
+#endif
+#ifdef ENGINE_METHOD_DIGESTS
+    case ENGINE_METHOD_DIGESTS:
+        ENGINE_unregister_digests(ctx->engine);
+        break;
+#endif
+#ifdef ENGINE_METHOD_PKEY_METHS
+    case ENGINE_METHOD_PKEY_METHS:
+        ENGINE_unregister_pkey_meths(ctx->engine);
+        break;
+#endif
+#ifdef ENGINE_METHOD_PKEY_ASN1_METHS
+    case ENGINE_METHOD_PKEY_ASN1_METHS:
+        ENGINE_unregister_pkey_asn1_meths(ctx->engine);
+        break;
+#endif
+#ifdef ENGINE_METHOD_EC
+    case ENGINE_METHOD_EC:
+        ENGINE_unregister_EC(ctx->engine);
+        break;
+#endif
+    default:
+        break;
+    }
+    return atom_ok;
+#else
+    return atom_notsup;
+#endif
+}
+
+static ERL_NIF_TERM engine_get_first_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
+{/* (Engine) */
+#ifdef HAS_ENGINE_SUPPORT
+    ERL_NIF_TERM ret;
+    ENGINE *engine;
+    ErlNifBinary engine_bin;
+    struct engine_ctx *ctx;
+
+    engine = ENGINE_get_first();
+    if(!engine) {
+        enif_alloc_binary(0, &engine_bin);
+        engine_bin.size = 0;
+        return enif_make_tuple2(env, atom_ok, enif_make_binary(env, &engine_bin));
+    }
+
+    ctx = enif_alloc_resource(engine_ctx_rtype, sizeof(struct engine_ctx));
+    ctx->engine = engine;
+    ctx->id = NULL;
+
+    ret = enif_make_resource(env, ctx);
+    enif_release_resource(ctx);
+
+    return enif_make_tuple2(env, atom_ok, ret);
+#else
+    return atom_notsup;
+#endif
+}
+
+static ERL_NIF_TERM engine_get_next_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
+{/* (Engine) */
+#ifdef HAS_ENGINE_SUPPORT
+    ERL_NIF_TERM ret;
+    ENGINE *engine;
+    ErlNifBinary engine_bin;
+    struct engine_ctx *ctx, *next_ctx;
+
+    // Get Engine
+    if (!enif_get_resource(env, argv[0], engine_ctx_rtype, (void**)&ctx)) {
+        PRINTF_ERR0("engine_get_next_nif Leaved: Parameter not an engine resource object");
+        return enif_make_badarg(env);
+    }
+    engine = ENGINE_get_next(ctx->engine);
+    if (!engine) {
+        enif_alloc_binary(0, &engine_bin);
+        engine_bin.size = 0;
+        return enif_make_tuple2(env, atom_ok, enif_make_binary(env, &engine_bin));
+    }
+
+    next_ctx = enif_alloc_resource(engine_ctx_rtype, sizeof(struct engine_ctx));
+    next_ctx->engine = engine;
+    next_ctx->id = NULL;
+
+    ret = enif_make_resource(env, next_ctx);
+    enif_release_resource(next_ctx);
+
+    return enif_make_tuple2(env, atom_ok, ret);
+#else
+    return atom_notsup;
+#endif
+}
+
+static ERL_NIF_TERM engine_get_id_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
+{/* (Engine) */
+#ifdef HAS_ENGINE_SUPPORT
+    ErlNifBinary engine_id_bin;
+    const char *engine_id;
+    int size;
+    struct engine_ctx *ctx;
+
+    // Get Engine
+    if (!enif_get_resource(env, argv[0], engine_ctx_rtype, (void**)&ctx)) {
+        PRINTF_ERR0("engine_get_id_nif Leaved: Parameter not an engine resource object");
+        return enif_make_badarg(env);
+    }
+
+    engine_id = ENGINE_get_id(ctx->engine);
+    if (!engine_id) {
+        enif_alloc_binary(0, &engine_id_bin);
+        engine_id_bin.size = 0;
+        return enif_make_tuple2(env, atom_ok, enif_make_binary(env, &engine_id_bin));
+    }
+
+    size = strlen(engine_id);
+    enif_alloc_binary(size, &engine_id_bin);
+    engine_id_bin.size = size;
+    memcpy(engine_id_bin.data, engine_id, size);
+
+    return enif_make_tuple2(env, atom_ok, enif_make_binary(env, &engine_id_bin));
+#else
+    return atom_notsup;
+#endif
+}
+
+static int get_engine_load_cmd_list(ErlNifEnv* env, const ERL_NIF_TERM term, char **cmds, int i)
+{
+#ifdef HAS_ENGINE_SUPPORT
+    ERL_NIF_TERM head, tail;
+    const ERL_NIF_TERM *tmp_tuple;
+    ErlNifBinary tmpbin;
+    int arity;
+    char* tmpstr;
+    int tmplen = 0;
+
+    if(!enif_is_empty_list(env, term)) {
+        if(!enif_get_list_cell(env, term, &head, &tail)) {
+            cmds[i] = NULL;
+            return -1;
+        } else {
+            if(!enif_get_tuple(env, head, &arity, &tmp_tuple)  || arity != 2) {
+                cmds[i] = NULL;
+                return -1;
+            } else {
+                if(!enif_inspect_binary(env, tmp_tuple[0], &tmpbin)) {
+                    cmds[i] = NULL;
+                    return -1;
+                } else {
+                    tmplen = tmpbin.size+1;
+                    tmpstr = enif_alloc(tmplen);
+                    (void) memcpy(tmpstr, tmpbin.data, tmplen);
+                    tmpstr[tmplen-1] = '\0';
+                    cmds[i++] = tmpstr;
+                }
+                if(!enif_inspect_binary(env, tmp_tuple[1], &tmpbin)) {
+                    cmds[i] = NULL;
+                    return -1;
+                } else {
+                    if(tmpbin.size == 0)
+                        cmds[i++] = NULL;
+                    else {
+                        tmplen = tmpbin.size+1;
+                        tmpstr = enif_alloc(tmplen);
+                        (void) memcpy(tmpstr, tmpbin.data, tmplen);
+                        tmpstr[tmplen-1] = '\0';
+                        cmds[i++] = tmpstr;
+                    }
+                }
+                return get_engine_load_cmd_list(env, tail, cmds, i);
+            }
+        }
+    } else {
+        cmds[i] = NULL;
+        return 0;
+    }
+#else
+    return atom_notsup;
+#endif
+}
+
+static ERL_NIF_TERM engine_get_all_methods_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
+{/* () */
+#ifdef HAS_ENGINE_SUPPORT
+    ERL_NIF_TERM method_array[12];
+    int i = 0;
+
+#ifdef ENGINE_METHOD_RSA
+    method_array[i++] = atom_engine_method_rsa;
+#endif
+#ifdef ENGINE_METHOD_DSA
+    method_array[i++] = atom_engine_method_dsa;
+#endif
+#ifdef ENGINE_METHOD_DH
+    method_array[i++] = atom_engine_method_dh;
+#endif
+#ifdef ENGINE_METHOD_RAND
+    method_array[i++] = atom_engine_method_rand;
+#endif
+#ifdef ENGINE_METHOD_ECDH
+    method_array[i++] = atom_engine_method_ecdh;
+#endif
+#ifdef ENGINE_METHOD_ECDSA
+    method_array[i++] = atom_engine_method_ecdsa;
+#endif
+#ifdef ENGINE_METHOD_STORE
+    method_array[i++] = atom_engine_method_store;
+#endif
+#ifdef ENGINE_METHOD_CIPHERS
+    method_array[i++] = atom_engine_method_ciphers;
+#endif
+#ifdef ENGINE_METHOD_DIGESTS
+    method_array[i++] = atom_engine_method_digests;
+#endif
+#ifdef ENGINE_METHOD_PKEY_METHS
+    method_array[i++] = atom_engine_method_pkey_meths;
+#endif
+#ifdef ENGINE_METHOD_PKEY_ASN1_METHS
+    method_array[i++] = atom_engine_method_pkey_asn1_meths;
+#endif
+#ifdef ENGINE_METHOD_EC
+    method_array[i++] = atom_engine_method_ec;
+#endif
+
+    return enif_make_list_from_array(env, method_array, i);
+#else
+    return atom_notsup;
+#endif
+}
diff --git a/lib/crypto/c_src/otp_test_engine.c b/lib/crypto/c_src/otp_test_engine.c
new file mode 100644
index 0000000000..414e89c0f6
--- /dev/null
+++ b/lib/crypto/c_src/otp_test_engine.c
@@ -0,0 +1,177 @@
+/*
+ * %CopyrightBegin%
+ *
+ * Copyright Ericsson AB 2017-2017. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * %CopyrightEnd%
+ */
+
+#ifdef _WIN32
+#define OPENSSL_OPT_WINDLL
+#endif
+#include <stdio.h>
+#include <string.h>
+
+#include <openssl/engine.h>
+#include <openssl/md5.h>
+
+#define PACKED_OPENSSL_VERSION(MAJ, MIN, FIX, P)	\
+    ((((((((MAJ << 8) | MIN) << 8 ) | FIX) << 8) | (P-'a'+1)) << 4) | 0xf)
+
+#define PACKED_OPENSSL_VERSION_PLAIN(MAJ, MIN, FIX) \
+    PACKED_OPENSSL_VERSION(MAJ,MIN,FIX,('a'-1))
+
+#if OPENSSL_VERSION_NUMBER < PACKED_OPENSSL_VERSION_PLAIN(1,1,0) \
+    || defined(LIBRESSL_VERSION_NUMBER)
+#define OLD
+#endif
+
+static const char *test_engine_id = "MD5";
+static const char *test_engine_name = "MD5 test engine";
+
+static int test_init(ENGINE *e) {
+    printf("OTP Test Engine Initializatzion!\r\n");
+    return 111;
+}
+
+static void add_test_data(unsigned char *md, unsigned int len)
+{
+    unsigned int i;
+
+    for (i=0; i<len; i++) {
+        md[i] = (unsigned char)(i & 0xff);
+    }
+}
+
+/* MD5 part */
+#undef data
+#ifdef OLD
+#define data(ctx) ((MD5_CTX *)ctx->md_data)
+#endif
+
+static int test_engine_md5_init(EVP_MD_CTX *ctx) {
+    fprintf(stderr, "MD5 initialized\r\n");
+#ifdef OLD
+    return MD5_Init(data(ctx));
+#else
+    return 1;
+#endif
+}
+
+static int test_engine_md5_update(EVP_MD_CTX *ctx,const void *data, size_t count)
+{
+    fprintf(stderr, "MD5 update\r\n");
+#ifdef OLD
+    return MD5_Update(data(ctx), data, (size_t)count);
+#else
+    return 1;
+#endif
+}
+
+static int test_engine_md5_final(EVP_MD_CTX *ctx,unsigned char *md) {
+#ifdef OLD
+    int ret;
+
+    fprintf(stderr, "MD5 final size of EVP_MD: %lu\r\n", sizeof(EVP_MD));
+    ret = MD5_Final(md, data(ctx));
+
+    if (ret > 0) {
+         add_test_data(md, MD5_DIGEST_LENGTH);
+    }
+    return ret;
+#else
+    fprintf(stderr, "MD5 final\r\n");
+    add_test_data(md, MD5_DIGEST_LENGTH);
+    return 1;
+#endif
+}
+
+#ifdef OLD
+static EVP_MD test_engine_md5_method=  {
+        NID_md5,                      /* The name ID for MD5 */
+        NID_undef,                    /* IGNORED: MD5 with private key encryption NID */
+        MD5_DIGEST_LENGTH,            /* Size of MD5 result, in bytes */
+        0,                            /* Flags */
+        test_engine_md5_init,         /* digest init */
+        test_engine_md5_update,       /* digest update */
+        test_engine_md5_final,        /* digest final */
+        NULL,                         /* digest copy */
+        NULL,                         /* digest cleanup */
+        EVP_PKEY_NULL_method,         /* IGNORED: pkey methods */
+        MD5_CBLOCK,                   /* Internal blocksize, see rfc1321/md5.h */
+        sizeof(EVP_MD *) + sizeof(MD5_CTX),
+        NULL,                          /* IGNORED: control function */
+};
+#endif
+
+static int test_digest_ids[] = {NID_md5};
+
+static int test_engine_digest_selector(ENGINE *e, const EVP_MD **digest,
+        const int **nids, int nid) {
+    int ok = 1;
+    if (!digest) {
+        *nids = test_digest_ids;
+        fprintf(stderr, "Digest is empty! Nid:%d\r\n", nid);
+        return 2;
+    }
+    fprintf(stderr, "Digest no %d requested\r\n",nid);
+    if (nid == NID_md5) {
+#ifdef OLD
+        *digest = &test_engine_md5_method;
+#else
+        EVP_MD *md = EVP_MD_meth_new(NID_md5, NID_undef);
+        if (!md ||
+            !EVP_MD_meth_set_result_size(md, MD5_DIGEST_LENGTH) ||
+            !EVP_MD_meth_set_flags(md, 0) ||
+            !EVP_MD_meth_set_init(md,  test_engine_md5_init) ||
+            !EVP_MD_meth_set_update(md,  test_engine_md5_update) ||
+            !EVP_MD_meth_set_final(md,  test_engine_md5_final) ||
+            !EVP_MD_meth_set_copy(md,  NULL) ||
+            !EVP_MD_meth_set_cleanup(md,  NULL) ||
+            !EVP_MD_meth_set_input_blocksize(md, MD5_CBLOCK) ||
+            !EVP_MD_meth_set_app_datasize(md, sizeof(EVP_MD *) + sizeof(MD5_CTX)) ||
+            !EVP_MD_meth_set_ctrl(md, NULL))
+            {
+                ok = 0;
+                *digest = NULL;
+            } else
+            {
+                *digest = md;
+            }
+#endif
+    }
+    else {
+        ok = 0;
+        *digest = NULL;
+    }
+    return ok;
+}
+
+
+static int bind_helper(ENGINE * e, const char *id)
+{
+    if (!ENGINE_set_id(e, test_engine_id) ||
+        !ENGINE_set_name(e, test_engine_name) ||
+        !ENGINE_set_init_function(e, test_init) ||
+        !ENGINE_set_digests(e, &test_engine_digest_selector)
+        )
+        return 0;
+
+    return 1;
+}
+
+IMPLEMENT_DYNAMIC_CHECK_FN();
+
+IMPLEMENT_DYNAMIC_BIND_FN(bind_helper);
diff --git a/lib/crypto/doc/src/Makefile b/lib/crypto/doc/src/Makefile
index 9c503b8fe0..937bb1419f 100644
--- a/lib/crypto/doc/src/Makefile
+++ b/lib/crypto/doc/src/Makefile
@@ -9,11 +9,11 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-# 
+#
 # The Initial Developer of the Original Code is Ericsson Utvecklings AB.
 # Portions created by Ericsson are Copyright 1999, Ericsson Utvecklings
 # AB. All Rights Reserved.''
-# 
+#
 #     $Id$
 #
 include $(ERL_TOP)/make/target.mk
@@ -39,12 +39,12 @@ XML_REF3_FILES = crypto.xml
 XML_REF6_FILES = crypto_app.xml
 
 XML_PART_FILES = release_notes.xml usersguide.xml
-XML_CHAPTER_FILES = notes.xml licenses.xml fips.xml
+XML_CHAPTER_FILES = notes.xml licenses.xml fips.xml engine_load.xml
 
 BOOK_FILES = book.xml
 
 XML_FILES = $(BOOK_FILES) $(XML_APPLICATION_FILES) $(XML_REF3_FILES)  $(XML_REF6_FILES) \
-            $(XML_PART_FILES) $(XML_CHAPTER_FILES) 
+            $(XML_PART_FILES) $(XML_CHAPTER_FILES)
 
 GIF_FILES =
 
@@ -63,9 +63,9 @@ HTML_REF_MAN_FILE = $(HTMLDIR)/index.html
 TOP_PDF_FILE = $(PDFDIR)/$(APPLICATION)-$(VSN).pdf
 
 # ----------------------------------------------------
-# FLAGS 
+# FLAGS
 # ----------------------------------------------------
-XML_FLAGS += 
+XML_FLAGS +=
 
 # ----------------------------------------------------
 # Targets
@@ -73,7 +73,6 @@ XML_FLAGS +=
 $(HTMLDIR)/%.gif: %.gif
 	$(INSTALL_DATA) $< $@
 
-
 docs: pdf html man
 
 $(TOP_PDF_FILE): $(XML_FILES)
@@ -86,7 +85,7 @@ man: $(MAN3_FILES) $(MAN6_FILES)
 
 gifs: $(GIF_FILES:%=$(HTMLDIR)/%)
 
-debug opt valgrind: 
+debug opt valgrind:
 
 clean clean_docs clean_tex:
 	rm -rf $(HTMLDIR)/*
@@ -97,7 +96,7 @@ clean clean_docs clean_tex:
 
 # ----------------------------------------------------
 # Release Target
-# ---------------------------------------------------- 
+# ----------------------------------------------------
 include $(ERL_TOP)/make/otp_release_targets.mk
 
 release_docs_spec: docs
@@ -114,4 +113,3 @@ release_docs_spec: docs
 
 
 release_spec:
-
diff --git a/lib/crypto/doc/src/crypto.xml b/lib/crypto/doc/src/crypto.xml
index 5b2c46a004..c0f85945a7 100644
--- a/lib/crypto/doc/src/crypto.xml
+++ b/lib/crypto/doc/src/crypto.xml
@@ -11,7 +11,7 @@
       Licensed under the Apache License, Version 2.0 (the "License");
       you may not use this file except in compliance with the License.
       You may obtain a copy of the License at
- 
+
           http://www.apache.org/licenses/LICENSE-2.0
 
       Unless required by applicable law or agreed to in writing, software
@@ -19,7 +19,6 @@
       WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
       See the License for the specific language governing permissions and
       limitations under the License.
-
     </legalnotice>
 
     <title>crypto</title>
@@ -68,11 +67,11 @@
 
  <section>
     <title>DATA TYPES </title>
-    
-    <code>key_value()  = integer() | binary() </code>
+
+    <code>key_value() = integer() | binary() </code>
     <p>Always <c>binary()</c> when used as return value</p>
 
-    <code>rsa_public()  = [key_value()] = [E, N]  </code>
+    <code>rsa_public() = [key_value()] = [E, N]  </code>
     <p> Where E is the public exponent and N is public modulus. </p>
 
     <code>rsa_private() = [key_value()] = [E, N, D] | [E, N, D, P1, P2, E1, E2, C] </code>
@@ -85,7 +84,7 @@
     <code>dss_public() = [key_value()] = [P, Q, G, Y] </code>
     <p>Where P, Q and G are the dss parameters and Y is the public key.</p>
 
-    <code>dss_private() =  [key_value()] = [P, Q, G, X] </code>
+    <code>dss_private() = [key_value()] = [P, Q, G, X] </code>
     <p>Where P, Q and G are the dss parameters and X is the private key.</p>
 
     <code>srp_public() = key_value() </code>
@@ -109,15 +108,16 @@
 
     <code>ecdh_private() = key_value() </code>
 
-    <code>ecdh_params() =  ec_named_curve() | ec_explicit_curve()</code>
+    <code>ecdh_params() = ec_named_curve() | ec_explicit_curve()</code>
 
     <code>ec_explicit_curve() =
-    {ec_field(), Prime :: key_value(), Point :: key_value(), Order :: integer(), CoFactor :: none | integer()} </code>
+    {ec_field(), Prime :: key_value(), Point :: key_value(), Order :: integer(),
+     CoFactor :: none | integer()} </code>
 
     <code>ec_field() = {prime_field, Prime :: integer()} |
     {characteristic_two_field, M :: integer(), Basis :: ec_basis()}</code>
 
-    <code>ec_basis() =  {tpbasis, K :: non_neg_integer()} |
+    <code>ec_basis() = {tpbasis, K :: non_neg_integer()} |
     {ppbasis, K1 :: non_neg_integer(), K2 :: non_neg_integer(), K3 :: non_neg_integer()} |
     onbasis</code>
 
@@ -138,14 +138,14 @@
 
      <code>stream_cipher() = rc4 | aes_ctr </code>
 
-     <code>block_cipher() =  aes_cbc | aes_cfb8 | aes_cfb128 | aes_ige256 | blowfish_cbc |
+     <code>block_cipher() = aes_cbc | aes_cfb8 | aes_cfb128 | aes_ige256 | blowfish_cbc |
      blowfish_cfb64 | des_cbc | des_cfb | des3_cbc | des3_cfb | des_ede3 | rc2_cbc </code>
 
-     <code>aead_cipher() =  aes_gcm | chacha20_poly1305 </code>
+     <code>aead_cipher() = aes_gcm | chacha20_poly1305 </code>
 
-     <code>stream_key() =  aes_key() | rc4_key() </code>
+     <code>stream_key() = aes_key() | rc4_key() </code>
 
-     <code>block_key() =  aes_key() |  blowfish_key() | des_key()| des3_key() </code>
+     <code>block_key() = aes_key() |  blowfish_key() | des_key()| des3_key() </code>
 
      <code>aes_key() = iodata() </code> <p>Key length is 128, 192 or 256 bits</p>
 
@@ -174,13 +174,17 @@
      Note that both md4 and md5 are recommended only for compatibility with existing applications.
      </p>
      <code> cipher_algorithms() = aes_cbc | aes_cfb8 | aes_cfb128 | aes_ctr | aes_gcm |
-     aes_ige256 | blowfish_cbc | blowfish_cfb64 | chacha20_poly1305 | des_cbc | des_cfb |
-     des3_cbc | des3_cfb | des_ede3 | rc2_cbc | rc4 </code>
-     <code> mac_algorithms() =   hmac | cmac</code>
-     <code> public_key_algorithms() =   rsa |dss | ecdsa | dh | ecdh | ec_gf2m</code>
+     aes_ige256 | blowfish_cbc | blowfish_cfb64 | chacha20_poly1305 | des_cbc |
+     des_cfb | des3_cbc | des3_cfb | des_ede3 | rc2_cbc | rc4 </code>
+     <code> mac_algorithms() = hmac | cmac</code>
+     <code> public_key_algorithms() = rsa |dss | ecdsa | dh | ecdh | ec_gf2m</code>
      <p>Note that ec_gf2m is not strictly a public key algorithm, but a restriction on what curves are supported
      with ecdsa and ecdh.
      </p>
+     <code>engine_method_type() = engine_method_rsa | engine_method_dsa | engine_method_dh |
+     engine_method_rand | engine_method_ecdh | engine_method_ecdsa |
+     engine_method_ciphers | engine_method_digests | engine_method_store |
+     engine_method_pkey_meths | engine_method_pkey_asn1_meths</code>
 
  </section>
 
@@ -261,13 +265,13 @@
 	is not supported by the underlying OpenSSL implementation.</p>
       </desc>
     </func>
-    
+
      <func>
       <name>bytes_to_integer(Bin) -> Integer </name>
       <fsummary>Convert binary representation, of an integer, to an Erlang integer.</fsummary>
       <type>
 	<v>Bin = binary() - as returned by crypto functions</v>
-	
+
         <v>Integer = integer() </v>
       </type>
       <desc>
@@ -439,7 +443,7 @@
       </type>
       <desc>
         <p>Updates the HMAC represented by <c>Context</c> using the given <c>Data</c>. <c>Context</c>
-        must have been generated using an HMAC init function (such as 
+        must have been generated using an HMAC init function (such as
         <seealso marker="#hmac_init-2">hmac_init</seealso>). <c>Data</c> can be any length. <c>NewContext</c>
         must be passed into the next call to <c>hmac_update</c>
 	or to one of the functions <seealso marker="#hmac_final-1">hmac_final</seealso> and
@@ -594,7 +598,7 @@
 	</p>
       </desc>
     </func>
-    
+
     <func>
       <name>private_encrypt(Type, PlainText, PrivateKey, Padding) -> CipherText</name>
       <fsummary>Encrypts PlainText using the private Key.</fsummary>
@@ -905,6 +909,124 @@ _FloatValue = rand:uniform().     % [0.0; 1.0[</pre>
       </desc>
     </func>
 
+    <!-- Engine functions -->
+    <func>
+      <name>engine_get_all_methods() -> Result</name>
+      <fsummary>Return list of all possible engine methods</fsummary>
+      <type>
+	<v>Result = [EngineMethod::atom()]</v>
+      </type>
+      <desc>
+	<p>
+	  Returns a list of all possible engine methods.
+	</p>
+	<p>	  
+	  May throw exception notsup in case there is 
+	  no engine support in the underlying OpenSSL implementation.
+	</p>
+	<p>
+	  See also the chapter <seealso marker="crypto:engine_load#engine_load">Engine Load</seealso>
+	  in the User's Guide.
+	</p>
+      </desc>
+    </func>
+
+    <func>
+      <name>engine_load(EngineId, PreCmds, PostCmds) -> Result</name>
+      <fsummary>Dynamical load an encryption engine</fsummary>
+      <type>
+	<v>EngineId = unicode:chardata()</v>
+	<v>PreCmds, PostCmds = [{unicode:chardata(), unicode:chardata()}]</v>
+	<v>Result = {ok, Engine::term()} | {error, Reason::term()}</v>
+      </type>
+      <desc>
+	<p>
+	  Loads the OpenSSL engine given by <c>EngineId</c> if it is available and then returns ok and
+	  an engine handle. This function is the same as calling <c>engine_load/4</c> with 
+	  <c>EngineMethods</c> set to a list of all the possible methods.  An error tuple is 
+	  returned if the engine can't be loaded.
+	</p>
+	<p>
+	  The function throws a badarg if the parameters are in wrong format.
+	  It may also throw the exception notsup in case there is 
+	  no engine support in the underlying OpenSSL implementation.
+	</p>
+	<p>
+	  See also the chapter <seealso marker="crypto:engine_load#engine_load">Engine Load</seealso>
+	  in the User's Guide.
+	</p>
+      </desc>
+    </func>
+
+    <func>
+      <name>engine_load(EngineId, PreCmds, PostCmds, EngineMethods) -> Result</name>
+      <fsummary>Dynamical load an encryption engine</fsummary>
+      <type>
+	<v>EngineId = unicode:chardata()</v>
+	<v>PreCmds, PostCmds = [{unicode:chardata(), unicode:chardata()}]</v>
+	<v>EngineMethods = [engine_method_type()]</v>
+	<v>Result = {ok, Engine::term()} | {error, Reason::term()}</v>
+      </type>
+      <desc>
+	<p>
+	  Loads the OpenSSL engine given by <c>EngineId</c> if it is available and then returns ok and
+	  an engine handle. An error tuple is returned if the engine can't be loaded.
+	</p>
+	<p>
+	  The function throws a badarg if the parameters are in wrong format.
+	  It may also throw the exception notsup in case there is 
+	  no engine support in the underlying OpenSSL implementation.
+	</p>
+	<p>
+	  See also the chapter <seealso marker="crypto:engine_load#engine_load">Engine Load</seealso>
+	  in the User's Guide.
+	</p>
+      </desc>
+    </func>
+
+    <func>
+      <name>engine_unload(Engine) -> Result</name>
+      <fsummary>Dynamical load an encryption engine</fsummary>
+      <type>
+	<v>Engine = term()</v>
+	<v>Result = ok | {error, Reason::term()}</v>
+      </type>
+      <desc>
+	<p>
+	  Unloads the OpenSSL engine given by <c>EngineId</c>.
+	  An error tuple is returned if the engine can't be unloaded.
+	</p>
+	<p>
+	  The function throws a badarg if the parameter is in wrong format.
+	  It may also throw the exception notsup in case there is 
+	  no engine support in the underlying OpenSSL implementation.
+	</p>
+	<p>
+	  See also the chapter <seealso marker="crypto:engine_load#engine_load">Engine Load</seealso>
+	  in the User's Guide.
+	</p>
+      </desc>
+    </func>
+
+    <func>
+      <name>engine_list() -> Result</name>
+      <fsummary>List the known engine ids</fsummary>
+      <type>
+	<v>Result = [EngineId::unicode:chardata()]</v>
+      </type>
+      <desc>
+	<p>List the id's of all engines in OpenSSL's internal list.</p>
+	<p>
+	  It may also throw the exception notsup in case there is 
+	  no engine support in the underlying OpenSSL implementation.
+	</p>
+	<p>
+	  See also the chapter <seealso marker="crypto:engine_load#engine_load">Engine Load</seealso> 
+	  in the User's Guide.
+	</p>
+      </desc>
+    </func>
+
  </funcs>
 
   <!-- Maybe put this in the users guide -->
@@ -979,4 +1101,3 @@ _FloatValue = rand:uniform().     % [0.0; 1.0[</pre>
   <!--   </p> -->
   <!-- </section> -->
 </erlref>
-
diff --git a/lib/crypto/doc/src/engine_load.xml b/lib/crypto/doc/src/engine_load.xml
new file mode 100644
index 0000000000..e5c3f5d561
--- /dev/null
+++ b/lib/crypto/doc/src/engine_load.xml
@@ -0,0 +1,110 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<!DOCTYPE chapter SYSTEM "chapter.dtd">
+
+<chapter>
+  <header>
+    <copyright>
+      <year>2017</year><year>2017</year>
+      <holder>Ericsson AB. All Rights Reserved.</holder>
+    </copyright>
+    <legalnotice>
+      The contents of this file are subject to the Erlang Public License,
+      Version 1.1, (the "License"); you may not use this file except in
+      compliance with the License. You should have received a copy of the
+      Erlang Public License along with this software. If not, it can be
+      retrieved online at http://www.erlang.org/.
+
+      Software distributed under the License is distributed on an "AS IS"
+      basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+      the License for the specific language governing rights and limitations
+      under the License.
+    </legalnotice>
+    <title>Engine Load</title>
+    <prepared>Lars Thorsén</prepared>
+    <date>2017-08-22</date>
+    <file>engine_load.xml</file>
+  </header>
+  <p>
+    <marker id="engine_load"></marker>
+    This chapter describes the support for loading encryption engines in the crypto application.
+  </p>
+
+  <section>
+    <title>Background</title>
+    <p>
+      OpenSSL exposes an Engine API, which makes it possible to plug in alternative
+      implementations for some or all of the cryptographic operations implemented by OpenSSL.
+      When configured appropriately, OpenSSL calls the engine's implementation of these
+      operations instead of its own.
+    </p>
+    <p>
+      Typically, OpenSSL engines provide a hardware implementation of specific cryptographic
+      operations. The hardware implementation usually offers improved performance over its
+      software-based counterpart, which is known as cryptographic acceleration.
+    </p>
+  </section>
+
+  <section>
+    <title>Use Cases</title>
+    <section>
+      <title>Dynamically load an engine from default directory</title>
+      <p>
+	If the engine is located in the OpenSSL/LibreSSL installation <c>engines</c> directory.
+      </p>
+      <code>
+1> {ok, Engine} = crypto:engine_load(&lt;&lt;"otp_test_engine">>, [], []).
+ {ok, #Ref}</code>
+       <note>
+	<p>The file name requirement on the engine dynamic library can differ between SSL versions.</p>
+      </note>
+    </section>
+
+    <section>
+      <title>Load an engine with the dynamic engine</title>
+      <p>
+	Load an engine with the help of the dynamic engine by giving the path to the library.
+      </p>
+      <code>
+ 2> {ok, Engine} = crypto:engine_load(&lt;&lt;"dynamic">>,
+                                      [{&lt;&lt;"SO_PATH">>,
+                                        &lt;&lt;"/some/path/otp_test_engine.so">>},
+                                       {&lt;&lt;"ID">>, &lt;&lt;"MD5">>},
+                                       &lt;&lt;"LOAD">>],
+                                      []).
+ {ok, #Ref}</code>
+      <note>
+	<p>The dynamic engine is not supported in LibreSSL from version 2.2.1</p>
+      </note>
+    </section>
+
+    <section>
+      <title>Load an engine and replace some methods</title>
+      <p>
+	Load an engine with the help of the dynamic engine and just
+	replace some engine methods.
+      </p>
+      <code>
+ 3> Methods = crypto:engine_get_all_methods() -- [engine_method_dh,engine_method_rand,
+engine_method_ciphers,engine_method_digests, engine_method_store,
+engine_method_pkey_meths, engine_method_pkey_asn1_meths].
+[engine_method_rsa,engine_method_dsa,
+ engine_method_ecdh,engine_method_ecdsa]
+ 4> {ok, Engine} = crypto:engine_load(&lt;&lt;"dynamic">>,
+                                      [{&lt;&lt;"SO_PATH">>,
+                                        &lt;&lt;"/some/path/otp_test_engine.so">>},
+                                       {&lt;&lt;"ID">>, &lt;&lt;"MD5">>},
+                                       &lt;&lt;"LOAD">>],
+                                      [],
+		                      Methods).
+ {ok, #Ref}</code>
+    </section>
+
+    <section>
+      <title>List all engines currently loaded</title>
+      <code>
+ 5> crypto:engine_list().
+[&lt;&lt;"dynamic">>, &lt;&lt;"MD5">>]</code>
+    </section>
+
+  </section>
+</chapter>
diff --git a/lib/crypto/doc/src/usersguide.xml b/lib/crypto/doc/src/usersguide.xml
index 7971aefff4..f637a1db79 100644
--- a/lib/crypto/doc/src/usersguide.xml
+++ b/lib/crypto/doc/src/usersguide.xml
@@ -11,7 +11,7 @@
       Licensed under the Apache License, Version 2.0 (the "License");
       you may not use this file except in compliance with the License.
       You may obtain a copy of the License at
- 
+
           http://www.apache.org/licenses/LICENSE-2.0
 
       Unless required by applicable law or agreed to in writing, software
@@ -19,7 +19,7 @@
       WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
       See the License for the specific language governing permissions and
       limitations under the License.
-    
+
     </legalnotice>
 
     <title>Crypto User's Guide</title>
@@ -48,5 +48,5 @@
   </description>
   <xi:include href="licenses.xml"/>
   <xi:include href="fips.xml"/>
+  <xi:include href="engine_load.xml"/>
 </part>
-
diff --git a/lib/crypto/src/Makefile b/lib/crypto/src/Makefile
index aea8a5a71c..edad0e6b61 100644
--- a/lib/crypto/src/Makefile
+++ b/lib/crypto/src/Makefile
@@ -39,8 +39,7 @@ MODULES= \
 	crypto \
 	crypto_ec_curves
 
-HRL_FILES= 
-
+HRL_FILES=
 ERL_FILES= $(MODULES:%=%.erl)
 
 TARGET_FILES= $(MODULES:%=$(EBIN)/%.$(EMULATOR))
@@ -56,16 +55,16 @@ APPUP_TARGET= $(EBIN)/$(APPUP_FILE)
 # ----------------------------------------------------
 # FLAGS
 # ----------------------------------------------------
-ERL_COMPILE_FLAGS += -DCRYPTO_VSN=\"$(VSN)\" -Werror
+ERL_COMPILE_FLAGS += -DCRYPTO_VSN=\"$(VSN)\" -Werror -I../include
 
 # ----------------------------------------------------
 # Targets
 # ----------------------------------------------------
 
-debug opt valgrind: $(TARGET_FILES) $(APP_TARGET) $(APPUP_TARGET) 
+debug opt valgrind: $(TARGET_FILES) $(APP_TARGET) $(APPUP_TARGET)
 
 clean:
-	rm -f $(TARGET_FILES) $(APP_TARGET) $(APPUP_TARGET) 
+	rm -f $(TARGET_FILES) $(APP_TARGET) $(APPUP_TARGET)
 	rm -f errs core *~
 
 $(APP_TARGET): $(APP_SRC) ../vsn.mk
@@ -78,7 +77,7 @@ docs:
 
 # ----------------------------------------------------
 # Release Target
-# ---------------------------------------------------- 
+# ----------------------------------------------------
 include $(ERL_TOP)/make/otp_release_targets.mk
 
 release_spec: opt
@@ -89,10 +88,3 @@ release_spec: opt
 		$(APPUP_TARGET) "$(RELSYSDIR)/ebin"
 
 release_docs_spec:
-
-
-
-
-
-
-
diff --git a/lib/crypto/src/crypto.erl b/lib/crypto/src/crypto.erl
index f9c4f7b71d..9eba4561e1 100644
--- a/lib/crypto/src/crypto.erl
+++ b/lib/crypto/src/crypto.erl
@@ -44,10 +44,18 @@
 -export([dh_generate_parameters/2, dh_check/1]). %% Testing see
 -export([ec_curve/1, ec_curves/0]).
 -export([rand_seed/1]).
+%% Engine
+-export([
+         engine_get_all_methods/0,
+         engine_load/3,
+         engine_load/4,
+         engine_unload/1,
+         engine_list/0
+        ]).
 
-%% Private. For tests.
--export([packed_openssl_version/4]).
 
+%% Private. For tests.
+-export([packed_openssl_version/4, engine_methods_convert_to_bitmask/2, get_test_engine/0]).
 
 -deprecated({rand_uniform, 2, next_major_release}).
 
@@ -568,10 +576,143 @@ compute_key(ecdh, Others, My, Curve) ->
 			 nif_curve_params(Curve),
 			 ensure_int_as_bin(My)).
 
+%%======================================================================
+%% Engine functions
+%%======================================================================
+%%----------------------------------------------------------------------
+%% Function: engine_get_all_methods/0
+%%----------------------------------------------------------------------
+-type engine_method_type() :: engine_method_rsa | engine_method_dsa | engine_method_dh |
+                              engine_method_rand | engine_method_ecdh | engine_method_ecdsa |
+                              engine_method_ciphers | engine_method_digests | engine_method_store |
+                              engine_method_pkey_meths | engine_method_pkey_asn1_meths | 
+                              engine_method_ec.
+
+-spec engine_get_all_methods() ->
+    [engine_method_type()].
+engine_get_all_methods() ->
+     notsup_to_error(engine_get_all_methods_nif()).
+
+%%----------------------------------------------------------------------
+%% Function: engine_load/3
+%%----------------------------------------------------------------------
+-spec engine_load(EngineId::unicode:chardata(),
+                  PreCmds::[{unicode:chardata(), unicode:chardata()}],
+                  PostCmds::[{unicode:chardata(), unicode:chardata()}]) ->
+    {ok, Engine::term()} | {error, Reason::term()}.
+engine_load(EngineId, PreCmds, PostCmds) when is_list(PreCmds), is_list(PostCmds) ->
+    engine_load(EngineId, PreCmds, PostCmds, engine_get_all_methods()).
+
+%%----------------------------------------------------------------------
+%% Function: engine_load/4
+%%----------------------------------------------------------------------
+-spec engine_load(EngineId::unicode:chardata(),
+                  PreCmds::[{unicode:chardata(), unicode:chardata()}],
+                  PostCmds::[{unicode:chardata(), unicode:chardata()}],
+                  EngineMethods::[engine_method_type()]) ->
+    {ok, Engine::term()} | {error, Reason::term()}.
+engine_load(EngineId, PreCmds, PostCmds, EngineMethods) when is_list(PreCmds),
+                                                             is_list(PostCmds) ->
+    try
+        ok = notsup_to_error(engine_load_dynamic_nif()),
+        case notsup_to_error(engine_by_id_nif(ensure_bin_chardata(EngineId))) of
+            {ok, Engine} ->
+                ok = engine_load_1(Engine, PreCmds, PostCmds, EngineMethods),
+                {ok, Engine};
+            {error, Error1} ->
+                {error, Error1}
+        end
+    catch
+       throw:Error2 ->
+          Error2
+    end.
+
+engine_load_1(Engine, PreCmds, PostCmds, EngineMethods) ->
+    try
+        ok = engine_nif_wrapper(engine_ctrl_cmd_strings_nif(Engine, ensure_bin_cmds(PreCmds))),
+        ok = engine_nif_wrapper(engine_add_nif(Engine)),
+        ok = engine_nif_wrapper(engine_init_nif(Engine)),
+        engine_load_2(Engine, PostCmds, EngineMethods),
+        ok
+    catch
+       throw:Error ->
+          %% The engine couldn't initialise, release the structural reference
+          ok = engine_free_nif(Engine),
+          throw(Error)
+    end.
+
+engine_load_2(Engine, PostCmds, EngineMethods) ->
+    try
+        ok = engine_nif_wrapper(engine_ctrl_cmd_strings_nif(Engine, ensure_bin_cmds(PostCmds))),
+        [ok = engine_nif_wrapper(engine_register_nif(Engine, engine_method_atom_to_int(Method))) ||
+            Method <- EngineMethods],
+        ok
+    catch
+       throw:Error ->
+          %% The engine registration failed, release the functional reference
+          ok = engine_finish_nif(Engine),
+          throw(Error)
+    end.
+
+%%----------------------------------------------------------------------
+%% Function: engine_unload/1
+%%----------------------------------------------------------------------
+-spec engine_unload(Engine::term()) ->
+    ok | {error, Reason::term()}.
+engine_unload(Engine) ->
+    engine_unload(Engine, engine_get_all_methods()).
+
+-spec engine_unload(Engine::term(), EngineMethods::[engine_method_type()]) ->
+    ok | {error, Reason::term()}.
+engine_unload(Engine, EngineMethods) ->
+    try
+        [ok = engine_nif_wrapper(engine_unregister_nif(Engine, engine_method_atom_to_int(Method))) ||
+            Method <- EngineMethods],
+        ok = engine_nif_wrapper(engine_remove_nif(Engine)),
+        %% Release the functional reference from engine_init_nif
+        ok = engine_nif_wrapper(engine_finish_nif(Engine)),
+        %% Release the structural reference from engine_by_id_nif
+        ok = engine_nif_wrapper(engine_free_nif(Engine))
+    catch
+       throw:Error ->
+          Error
+    end.
+
+%%----------------------------------------------------------------------
+%% Function: engine_list/0
+%%----------------------------------------------------------------------
+-spec engine_list() ->
+    [EngineId::binary()].
+engine_list() ->
+    case notsup_to_error(engine_get_first_nif()) of
+        {ok, <<>>} ->
+            [];
+        {ok, Engine} ->
+            case notsup_to_error(engine_get_id_nif(Engine)) of
+                {ok, <<>>} ->
+                    engine_list(Engine, []);
+                {ok, EngineId} ->
+                    engine_list(Engine, [EngineId])
+            end
+    end.
+
+engine_list(Engine0, IdList) ->
+    case notsup_to_error(engine_get_next_nif(Engine0)) of
+        {ok, <<>>} ->
+            lists:reverse(IdList);
+        {ok, Engine1} ->
+            case notsup_to_error(engine_get_id_nif(Engine1)) of
+                {ok, <<>>} ->
+                    engine_list(Engine1, IdList);
+                {ok, EngineId} ->
+                    engine_list(Engine1, [EngineId |IdList])
+            end
+    end.
+
+
 %%--------------------------------------------------------------------
 %%% On load
 %%--------------------------------------------------------------------
-
 on_load() ->
     LibBaseName = "crypto",
     PrivDir = code:priv_dir(crypto),
@@ -631,12 +772,12 @@ path2bin(Path) when is_list(Path) ->
     end.
 
 %%--------------------------------------------------------------------
-%%% Internal functions 
+%%% Internal functions
 %%--------------------------------------------------------------------
 max_bytes() ->
     ?MAX_BYTES_TO_NIF.
 
-notsup_to_error(notsup) ->
+notsup_to_error(notsup) -> 
     erlang:error(notsup);
 notsup_to_error(Other) ->
     Other.
@@ -760,7 +901,7 @@ do_stream_decrypt({rc4, State0}, Data) ->
 
 
 %%
-%% AES - in counter mode (CTR) with state maintained for multi-call streaming 
+%% AES - in counter mode (CTR) with state maintained for multi-call streaming
 %%
 -type ctr_state() :: { iodata(), binary(), binary(), integer() } | binary().
 
@@ -769,11 +910,11 @@ do_stream_decrypt({rc4, State0}, Data) ->
 				 { ctr_state(), binary() }.
 -spec aes_ctr_stream_decrypt(ctr_state(), binary()) ->
 				 { ctr_state(), binary() }.
- 
+
 aes_ctr_stream_init(_Key, _IVec) -> ?nif_stub.
 aes_ctr_stream_encrypt(_State, _Data) -> ?nif_stub.
 aes_ctr_stream_decrypt(_State, _Cipher) -> ?nif_stub.
-     
+
 %%
 %% RC4 - symmetric stream cipher
 %%
@@ -858,22 +999,22 @@ pkey_verify_nif(_Algorithm, _Type, _Data, _Signature, _Key, _Options) -> ?nif_st
 rsa_generate_key_nif(_Bits, _Exp) -> ?nif_stub.
 
 %% DH Diffie-Hellman functions
-%% 
+%%
 
 %% Generate (and check) Parameters is not documented because they are implemented
 %% for testing (and offline parameter generation) only.
-%% From the openssl doc: 
+%% From the openssl doc:
 %%  DH_generate_parameters() may run for several hours before finding a suitable prime.
-%% Thus dh_generate_parameters may in this implementation block 
+%% Thus dh_generate_parameters may in this implementation block
 %% the emulator for several hours.
 %%
-%% usage: dh_generate_parameters(1024, 2 or 5) -> 
+%% usage: dh_generate_parameters(1024, 2 or 5) ->
 %%    [Prime=mpint(), SharedGenerator=mpint()]
 dh_generate_parameters(PrimeLen, Generator) ->
     case dh_generate_parameters_nif(PrimeLen, Generator) of
 	error -> erlang:error(generation_failed, [PrimeLen,Generator]);
 	Ret -> Ret
-    end.  
+    end.
 
 dh_generate_parameters_nif(_PrimeLen, _Generator) -> ?nif_stub.
 
@@ -985,7 +1126,7 @@ pkey_crypt_nif(_Algorithm, _In, _Key, _Options, _IsPrivate, _IsEncrypt) -> ?nif_
 %% MP representaion  (SSH2)
 mpint(X) when X < 0 -> mpint_neg(X);
 mpint(X) -> mpint_pos(X).
- 
+
 -define(UINT32(X),   X:32/unsigned-big-integer).
 
 
@@ -993,7 +1134,7 @@ mpint_neg(X) ->
     Bin = int_to_bin_neg(X, []),
     Sz = byte_size(Bin),
     <<?UINT32(Sz), Bin/binary>>.
-    
+
 mpint_pos(X) ->
     Bin = int_to_bin_pos(X, []),
     <<MSB,_/binary>> = Bin,
@@ -1015,7 +1156,6 @@ erlint(<<MPIntSize:32/integer,MPIntValue/binary>>) ->
 %%
 mod_exp_nif(_Base,_Exp,_Mod,_bin_hdr) -> ?nif_stub.
 
-
 %%%----------------------------------------------------------------
 %% 9470495 == V(0,9,8,zh).
 %% 268435615 == V(1,0,0,i).
@@ -1026,3 +1166,92 @@ packed_openssl_version(MAJ, MIN, FIX, P0) ->
     P1 = atom_to_list(P0),
     P = lists:sum([C-$a||C<-P1]),
     ((((((((MAJ bsl 8) bor MIN) bsl 8 ) bor FIX) bsl 8) bor (P+1)) bsl 4) bor 16#f).
+
+%%--------------------------------------------------------------------
+%% Engine nifs
+engine_by_id_nif(_EngineId) -> ?nif_stub.
+engine_init_nif(_Engine) -> ?nif_stub.
+engine_finish_nif(_Engine) -> ?nif_stub.
+engine_free_nif(_Engine) -> ?nif_stub.
+engine_load_dynamic_nif() -> ?nif_stub.
+engine_ctrl_cmd_strings_nif(_Engine, _Cmds) -> ?nif_stub.
+engine_add_nif(_Engine)  -> ?nif_stub.
+engine_remove_nif(_Engine)  -> ?nif_stub.
+engine_register_nif(_Engine, _EngineMethod) -> ?nif_stub.
+engine_unregister_nif(_Engine, _EngineMethod) -> ?nif_stub.
+engine_get_first_nif() -> ?nif_stub.
+engine_get_next_nif(_Engine) -> ?nif_stub.
+engine_get_id_nif(_Engine) -> ?nif_stub.
+engine_get_all_methods_nif() -> ?nif_stub.
+
+%%--------------------------------------------------------------------
+%% Engine internals
+engine_nif_wrapper(ok) ->
+    ok;
+engine_nif_wrapper(notsup) ->
+    erlang:error(notsup);
+engine_nif_wrapper({error, Error}) ->
+    throw({error, Error}).
+
+ensure_bin_chardata(CharData) when is_binary(CharData) ->
+    CharData;
+ensure_bin_chardata(CharData) ->
+    unicode:characters_to_binary(CharData).
+
+ensure_bin_cmds(CMDs) ->
+    ensure_bin_cmds(CMDs, []).
+
+ensure_bin_cmds([], Acc) ->
+    lists:reverse(Acc);
+ensure_bin_cmds([{Key, Value} |CMDs], Acc) ->
+    ensure_bin_cmds(CMDs, [{ensure_bin_chardata(Key), ensure_bin_chardata(Value)} | Acc]);
+ensure_bin_cmds([Key | CMDs], Acc) ->
+    ensure_bin_cmds(CMDs, [{ensure_bin_chardata(Key), <<"">>} | Acc]).
+
+engine_methods_convert_to_bitmask([], BitMask) ->
+    BitMask;
+engine_methods_convert_to_bitmask(engine_method_all, _BitMask) ->
+    16#FFFF;
+engine_methods_convert_to_bitmask(engine_method_none, _BitMask) ->
+    16#0000;
+engine_methods_convert_to_bitmask([M |Ms], BitMask) ->
+    engine_methods_convert_to_bitmask(Ms, BitMask bor engine_method_atom_to_int(M)).
+
+engine_method_atom_to_int(engine_method_rsa) -> 16#0001;
+engine_method_atom_to_int(engine_method_dsa) -> 16#0002;
+engine_method_atom_to_int(engine_method_dh) -> 16#0004;
+engine_method_atom_to_int(engine_method_rand) -> 16#0008;
+engine_method_atom_to_int(engine_method_ecdh) -> 16#0010;
+engine_method_atom_to_int(engine_method_ecdsa) -> 16#0020;
+engine_method_atom_to_int(engine_method_ciphers) -> 16#0040;
+engine_method_atom_to_int(engine_method_digests) -> 16#0080;
+engine_method_atom_to_int(engine_method_store) -> 16#0100;
+engine_method_atom_to_int(engine_method_pkey_meths) -> 16#0200;
+engine_method_atom_to_int(engine_method_pkey_asn1_meths) -> 16#0400;
+engine_method_atom_to_int(engine_method_ec) -> 16#0800;
+engine_method_atom_to_int(X) ->
+    erlang:error(badarg, [X]).
+
+get_test_engine() ->
+    Type = erlang:system_info(system_architecture),
+    LibDir = filename:join([code:priv_dir(crypto), "lib"]),
+    ArchDir = filename:join([LibDir, Type]),
+    case filelib:is_dir(ArchDir) of        
+	true  -> check_otp_test_engine(ArchDir);
+	false -> check_otp_test_engine(LibDir)
+    end.
+
+check_otp_test_engine(LibDir) ->
+    case filelib:wildcard("otp_test_engine*", LibDir) of
+        [] ->
+            {error, notexist};
+        [LibName] ->
+            LibPath = filename:join(LibDir,LibName),
+            case filelib:is_file(LibPath) of
+                true ->
+                    {ok, unicode:characters_to_binary(LibPath)};
+                false ->
+                    {error, notexist}
+            end
+    end.
+            
diff --git a/lib/crypto/test/Makefile b/lib/crypto/test/Makefile
index 138081d386..e046a25338 100644
--- a/lib/crypto/test/Makefile
+++ b/lib/crypto/test/Makefile
@@ -7,7 +7,8 @@ include $(ERL_TOP)/make/$(TARGET)/otp.mk
 
 MODULES = \
 	blowfish_SUITE \
-	crypto_SUITE
+	crypto_SUITE \
+	engine_SUITE
 
 ERL_FILES= $(MODULES:%=%.erl)
 
@@ -27,7 +28,7 @@ RELSYSDIR = $(RELEASE_PATH)/crypto_test
 # FLAGS
 # ----------------------------------------------------
 ERL_MAKE_FLAGS += 
-ERL_COMPILE_FLAGS +=
+ERL_COMPILE_FLAGS += +nowarn_export_all
 
 EBIN = .
 MAKE_EMAKE = $(wildcard $(ERL_TOP)/make/make_emakefile)
@@ -77,7 +78,7 @@ release_spec:
 release_tests_spec: $(TEST_TARGET)
 	$(INSTALL_DIR) "$(RELSYSDIR)"
 	$(INSTALL_DATA) crypto.spec crypto.cover $(RELTEST_FILES) "$(RELSYSDIR)"
-	@tar cfh - crypto_SUITE_data | (cd "$(RELSYSDIR)"; tar xf -)
+	@tar cfh - *_SUITE_data | (cd "$(RELSYSDIR)"; tar xf -)
 	chmod -R u+w "$(RELSYSDIR)"
 
 release_docs_spec:
diff --git a/lib/crypto/test/crypto_SUITE.erl b/lib/crypto/test/crypto_SUITE.erl
index 69f02d3da6..6dab459df6 100644
--- a/lib/crypto/test/crypto_SUITE.erl
+++ b/lib/crypto/test/crypto_SUITE.erl
@@ -198,7 +198,7 @@ init_per_suite(Config) ->
 		    %% This is NOT how you want to do seeding, it is just here
 		    %% to make the tests pass. Check your OS manual for how you
 		    %% really want to seed.
-		    {H,M,L} = erlang:now(),
+		    {H,M,L} = erlang:timestamp(),
 		    Bin = <<H:24,M:20,L:20>>,
 		    crypto:rand_seed(<< <<Bin/binary>> || _ <- lists:seq(1,16) >>),
 		    Config
diff --git a/lib/crypto/test/engine_SUITE.erl b/lib/crypto/test/engine_SUITE.erl
new file mode 100644
index 0000000000..5f74304fe7
--- /dev/null
+++ b/lib/crypto/test/engine_SUITE.erl
@@ -0,0 +1,312 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2017-2017. All Rights Reserved.
+%%
+%% Licensed under the Apache License, Version 2.0 (the "License");
+%% you may not use this file except in compliance with the License.
+%% You may obtain a copy of the License at
+%%
+%%     http://www.apache.org/licenses/LICENSE-2.0
+%%
+%% Unless required by applicable law or agreed to in writing, software
+%% distributed under the License is distributed on an "AS IS" BASIS,
+%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+%% See the License for the specific language governing permissions and
+%% limitations under the License.
+%%
+%% %CopyrightEnd%
+%%
+%%
+
+-module(engine_SUITE).
+
+-include_lib("common_test/include/ct.hrl").
+
+%% Note: This directive should only be used in test suites.
+-compile(export_all).
+
+%%--------------------------------------------------------------------
+%% Common Test interface functions -----------------------------------
+%%--------------------------------------------------------------------
+suite() ->
+    [{ct_hooks,[ts_install_cth]},
+     {timetrap,{seconds, 10}}
+    ].
+
+all() ->
+    [
+     get_all_possible_methods,
+     engine_load_all_methods,
+     engine_load_some_methods,
+     bad_arguments,
+     unknown_engine,
+     pre_command_fail_bad_value,
+     pre_command_fail_bad_key,
+     failed_engine_init
+    ].
+
+init_per_suite(Config) ->    
+    try crypto:start() of
+	ok ->
+            Config;
+        {error,{already_started,crypto}} ->
+            Config
+    catch _:_ ->
+	    {skip, "Crypto did not start"}
+    end.
+end_per_suite(_Config) ->
+    ok.
+
+%%--------------------------------------------------------------------
+init_per_group(_Group, Config0) ->
+    Config0.
+
+end_per_group(_, _) ->
+    ok.
+
+%%--------------------------------------------------------------------
+init_per_testcase(_Case, Config) ->
+    Config.
+end_per_testcase(_Case, _Config) ->
+    ok.
+
+%%-------------------------------------------------------------------------
+%% Test cases starts here.
+%%-------------------------------------------------------------------------
+get_all_possible_methods() ->
+    [{doc, "Just fetch all possible engine methods supported."}].
+
+get_all_possible_methods(Config) when is_list(Config) ->
+    try
+        List = crypto:engine_get_all_methods(),
+        ct:log("crypto:engine_get_all_methods() -> ~p\n", [List]),
+        ok
+    catch
+        error:notsup ->
+            {skip, "Engine not supported on this OpenSSL version"}
+    end.
+
+engine_load_all_methods()->
+    [{doc, "Use a dummy md5 engine that does not implement md5"
+      "but rather returns a static binary to test that crypto:engine_load "
+      "functions works."}].
+
+engine_load_all_methods(Config) when is_list(Config) ->
+    case crypto:get_test_engine() of
+        {error, notexist} ->
+            {skip, "OTP Test engine not found"};
+        {ok, Engine} ->
+            try 
+                Md5Hash1 =  <<106,30,3,246,166,222,229,158,244,217,241,179,50,232,107,109>>,
+                Md5Hash1 = crypto:hash(md5, "Don't panic"),
+                Md5Hash2 =  <<0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15>>,
+                case crypto:engine_load(<<"dynamic">>,
+                                        [{<<"SO_PATH">>, Engine},
+                                         {<<"ID">>, <<"MD5">>},
+                                         <<"LOAD">>],
+                                        []) of
+                    {ok, E} ->
+                        case crypto:hash(md5, "Don't panic") of
+                            Md5Hash1 ->
+                                ct:fail(fail_to_load_still_original_engine);
+                            Md5Hash2 ->
+                                ok;
+                            _ ->
+                                ct:fail(fail_to_load_engine)
+                        end,
+                        ok = crypto:engine_unload(E),
+                        case crypto:hash(md5, "Don't panic") of
+                            Md5Hash2 ->
+                                ct:fail(fail_to_unload_still_test_engine);
+                            Md5Hash1 ->
+                                ok;
+                            _ ->
+                                ct:fail(fail_to_unload_engine)
+                        end;
+                    {error, bad_engine_id} ->
+                        {skip, "Dynamic Engine not supported"}
+                end
+           catch
+               error:notsup ->
+                  {skip, "Engine not supported on this OpenSSL version"}
+           end
+    end.
+
+engine_load_some_methods()->
+    [{doc, "Use a dummy md5 engine that does not implement md5"
+      "but rather returns a static binary to test that crypto:engine_load "
+      "functions works."}].
+
+engine_load_some_methods(Config) when is_list(Config) ->
+    case crypto:get_test_engine() of
+        {error, notexist} ->
+            {skip, "OTP Test engine not found"};
+        {ok, Engine} ->
+            try 
+                Md5Hash1 =  <<106,30,3,246,166,222,229,158,244,217,241,179,50,232,107,109>>,
+                Md5Hash1 = crypto:hash(md5, "Don't panic"),
+                Md5Hash2 =  <<0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15>>,
+                EngineMethods = crypto:engine_get_all_methods() --
+                    [engine_method_dh,engine_method_rand,
+                     engine_method_ciphers, engine_method_store,
+                     engine_method_pkey_meths, engine_method_pkey_asn1_meths],
+                case crypto:engine_load(<<"dynamic">>,
+                                        [{<<"SO_PATH">>, Engine},
+                                         {<<"ID">>, <<"MD5">>},
+                                         <<"LOAD">>],
+                                        [],
+                                        EngineMethods) of
+                    {ok, E} ->        
+                        case crypto:hash(md5, "Don't panic") of
+                            Md5Hash1 ->
+                                ct:fail(fail_to_load_engine_still_original);
+                            Md5Hash2 ->
+                                ok;
+                            _ ->
+                                ct:fail(fail_to_load_engine)
+                        end,
+                        ok = crypto:engine_unload(E),
+                        case crypto:hash(md5, "Don't panic") of
+                            Md5Hash2 ->
+                                ct:fail(fail_to_unload_still_test_engine);
+                            Md5Hash1 ->
+                                ok;
+                            _ ->
+                                ct:fail(fail_to_unload_engine)
+                        end;
+                    {error, bad_engine_id} ->
+                    {skip, "Dynamic Engine not supported"}
+                end
+           catch
+               error:notsup ->
+                  {skip, "Engine not supported on this OpenSSL version"}
+           end
+    end.
+
+%%-------------------------------------------------------------------------
+%% Error cases
+bad_arguments()->
+    [{doc, "Test different arguments in bad format."}].
+
+bad_arguments(Config) when is_list(Config) ->
+    case crypto:get_test_engine() of
+        {error, notexist} ->
+            {skip, "OTP Test engine not found"};
+        {ok, Engine} ->
+            try 
+                try
+                    crypto:engine_load(fail_engine, [], [])
+                catch
+                    error:badarg ->
+                       ok
+                end,
+                try
+                    crypto:engine_load(<<"dynamic">>,
+                                       [{<<"SO_PATH">>, Engine},
+                                        1,
+                                        {<<"ID">>, <<"MD5">>},
+                                        <<"LOAD">>],
+                                       [])
+                catch
+                    error:badarg ->
+                       ok
+                end,
+                try
+                    crypto:engine_load(<<"dynamic">>,
+                                       [{<<"SO_PATH">>, Engine},
+                                        {'ID', <<"MD5">>},
+                                        <<"LOAD">>],
+                                       [])
+                catch
+                    error:badarg ->
+                       ok
+                end
+          catch
+              error:notsup ->
+                 {skip, "Engine not supported on this OpenSSL version"}
+          end
+    end.
+
+unknown_engine() ->
+    [{doc, "Try to load a non existent engine."}].
+
+unknown_engine(Config) when is_list(Config) ->
+    try
+        {error, bad_engine_id} = crypto:engine_load(<<"fail_engine">>, [], []),
+        ok
+    catch
+        error:notsup ->
+           {skip, "Engine not supported on this OpenSSL version"}
+    end.
+
+pre_command_fail_bad_value() ->
+    [{doc, "Test pre command due to bad value"}].
+
+pre_command_fail_bad_value(Config) when is_list(Config) ->
+    DataDir = unicode:characters_to_binary(code:priv_dir(crypto)),
+    try
+        case crypto:engine_load(<<"dynamic">>,
+                                [{<<"SO_PATH">>,
+                                  <<DataDir/binary, <<"/libfail_engine.so">>/binary >>},
+                                 {<<"ID">>, <<"MD5">>},
+                                 <<"LOAD">>],
+                                []) of
+            {error, ctrl_cmd_failed} ->
+                ok;
+            {error, bad_engine_id} ->
+                {skip, "Dynamic Engine not supported"}
+        end
+    catch
+        error:notsup ->
+           {skip, "Engine not supported on this OpenSSL version"}
+    end.
+
+pre_command_fail_bad_key() ->
+    [{doc, "Test pre command due to bad key"}].
+
+pre_command_fail_bad_key(Config) when is_list(Config) ->
+    try
+        case crypto:get_test_engine() of
+            {error, notexist} ->
+                {skip, "OTP Test engine not found"};
+            {ok, Engine} ->
+                case crypto:engine_load(<<"dynamic">>,
+                                        [{<<"SO_WRONG_PATH">>, Engine},
+                                         {<<"ID">>, <<"MD5">>},
+                                         <<"LOAD">>],
+                                        []) of
+                    {error, ctrl_cmd_failed} ->
+                        ok;
+                    {error, bad_engine_id} ->
+                        {skip, "Dynamic Engine not supported"}
+                end
+        end
+   catch 
+       error:notsup ->
+          {skip, "Engine not supported on this OpenSSL version"}
+   end.
+
+failed_engine_init()->
+    [{doc, "Test failing engine init due to missed pre command"}].
+
+failed_engine_init(Config) when is_list(Config) ->
+    try
+        case crypto:get_test_engine() of
+            {error, notexist} ->
+                {skip, "OTP Test engine not found"};
+            {ok, Engine} ->
+                case crypto:engine_load(<<"dynamic">>,
+                                        [{<<"SO_PATH">>, Engine},
+                                         {<<"ID">>, <<"MD5">>}],
+                                        []) of
+                    {error, add_engine_failed} ->
+                        ok;
+                    {error, bad_engine_id} ->
+                        {skip, "Dynamic Engine not supported"}
+                end
+        end
+   catch 
+       error:notsup ->
+          {skip, "Engine not supported on this OpenSSL version"}
+   end.
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