Move poly1305 functionality to a new file

1 files changed, 58 insertions, 0 deletions

diff --git a/lib/crypto/c_src/poly1305.c b/lib/crypto/c_src/poly1305.c
new file mode 100644
index 0000000000..c28deae34b
--- /dev/null
+++ b/lib/crypto/c_src/poly1305.c
@@ -0,0 +1,58 @@
+#include "poly1305.h"
+
+/* For OpenSSL >= 1.1.1 the hmac_nif and cmac_nif could be integrated into poly1305 (with 'type' as parameter) */
+ERL_NIF_TERM poly1305_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
+{/* (Key, Text) */
+#ifdef HAVE_POLY1305
+    ErlNifBinary key_bin, text, ret_bin;
+    ERL_NIF_TERM ret = atom_error;
+    EVP_PKEY *key = NULL;
+    EVP_MD_CTX *mctx = NULL;
+    EVP_PKEY_CTX *pctx = NULL;
+    const EVP_MD *md = NULL;
+    size_t size;
+    int type;
+
+    type = EVP_PKEY_POLY1305;
+
+    if (!enif_inspect_binary(env, argv[0], &key_bin) ||
+        !(key_bin.size == 32) ) {
+        return enif_make_badarg(env);
+    }
+
+    if (!enif_inspect_binary(env, argv[1], &text) ) {
+        return enif_make_badarg(env);
+    }
+
+    key = EVP_PKEY_new_raw_private_key(type, /*engine*/ NULL, key_bin.data,  key_bin.size);
+
+    if (!key ||
+        !(mctx = EVP_MD_CTX_new()) ||
+        !EVP_DigestSignInit(mctx, &pctx, md, /*engine*/ NULL, key) ||
+        !EVP_DigestSignUpdate(mctx, text.data, text.size)) {
+        goto err;
+    }
+
+    if (!EVP_DigestSignFinal(mctx, NULL, &size) ||
+        !enif_alloc_binary(size, &ret_bin) ||
+        !EVP_DigestSignFinal(mctx, ret_bin.data, &size)) {
+        goto err;
+    }
+
+    if ((size != ret_bin.size) &&
+        !enif_realloc_binary(&ret_bin, size)) {
+        goto err;
+    }
+
+    ret = enif_make_binary(env, &ret_bin);
+
+ err:
+    EVP_MD_CTX_free(mctx);
+    EVP_PKEY_free(key);
+    return ret;
+
+#else
+    return atom_notsup;
+#endif
+}
+