1 files changed, 73 insertions, 0 deletions
diff --git a/lib/crypto/c_src/cmac.c b/lib/crypto/c_src/cmac.c
new file mode 100644
index 0000000000..a1564f6661
--- /dev/null
+++ b/lib/crypto/c_src/cmac.c
@@ -0,0 +1,73 @@
+/*
+ * %CopyrightBegin%
+ *
+ * Copyright Ericsson AB 2010-2018. 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%
+ */
+
+#include "common.h"
+
+/*****************************************************************
+ *
+ * This file has functions for compatibility with cryptolibs
+ * lacking the EVP_Digest API.
+ *
+ * See mac.c for the implementation using the EVP interface.
+ *
+ ****************************************************************/
+
+#if defined(HAVE_CMAC) && !defined(HAVE_EVP_PKEY_new_CMAC_key)
+
+#include "cmac.h"
+
+int cmac_low_level(ErlNifEnv* env,
+                   ErlNifBinary key_bin, const EVP_CIPHER* cipher, ErlNifBinary text,
+                   ErlNifBinary *ret_bin, int *ret_bin_alloc, ERL_NIF_TERM *return_term)
+{
+    CMAC_CTX *ctx = NULL;
+    size_t size;
+
+    if ((ctx = CMAC_CTX_new()) == NULL)
+        goto local_err;
+
+    if (!CMAC_Init(ctx, key_bin.data, key_bin.size, cipher, NULL))
+        goto local_err;
+
+    if (!CMAC_Update(ctx, text.data, text.size))
+        goto local_err;
+
+    if ((size = (size_t)EVP_CIPHER_block_size(cipher)) < 0)
+        goto local_err;
+
+    if (!enif_alloc_binary(size, ret_bin))
+        goto local_err;
+    *ret_bin_alloc = 1;
+                
+    if (!CMAC_Final(ctx, ret_bin->data, &ret_bin->size))
+        goto local_err;
+
+    CMAC_CTX_free(ctx);
+    return 1;
+
+ local_err:
+    if (ctx)
+        CMAC_CTX_free(ctx);
+
+    *return_term = EXCP_ERROR(env,"Compat cmac");
+    return 0;
+}
+
+#endif