1 files changed, 84 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..196b7476e3
--- /dev/null
+++ b/lib/crypto/c_src/cmac.c
@@ -0,0 +1,84 @@
+/*
+ * %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 "cmac.h"
+#include "cipher.h"
+
+ERL_NIF_TERM cmac_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
+{/* (Type, Key, Data) */
+#if defined(HAVE_CMAC)
+    struct cipher_type_t *cipherp = NULL;
+    const EVP_CIPHER     *cipher;
+    CMAC_CTX             *ctx = NULL;
+    ErlNifBinary         key;
+    ErlNifBinary         data;
+    ERL_NIF_TERM         ret;
+    size_t               ret_size;
+    unsigned char       *outp;
+    int                  cipher_len;
+
+    ASSERT(argc == 3);
+
+    if (!enif_inspect_iolist_as_binary(env, argv[1], &key))
+        goto bad_arg;
+    if ((cipherp = get_cipher_type(argv[0], key.size)) == NULL)
+        goto bad_arg;
+    if (!enif_inspect_iolist_as_binary(env, argv[2], &data))
+        goto bad_arg;
+
+    if ((cipher = cipherp->cipher.p) == NULL)
+        return enif_raise_exception(env, atom_notsup);
+
+    if ((ctx = CMAC_CTX_new()) == NULL)
+        goto err;
+    if (!CMAC_Init(ctx, key.data, key.size, cipher, NULL))
+        goto err;
+    if (!CMAC_Update(ctx, data.data, data.size))
+        goto err;
+    if ((cipher_len = EVP_CIPHER_block_size(cipher)) < 0)
+        goto err;
+    if ((outp = enif_make_new_binary(env, (size_t)cipher_len, &ret)) == NULL)
+        goto err;
+    if (!CMAC_Final(ctx, outp, &ret_size))
+        goto err;
+
+    ASSERT(ret_size == (unsigned)EVP_CIPHER_block_size(cipher));
+    CONSUME_REDS(env, data);
+    goto done;
+
+ bad_arg:
+    return enif_make_badarg(env);
+
+ err:
+    ret = atom_notsup;
+
+ done:
+    if (ctx)
+        CMAC_CTX_free(ctx);
+    return ret;
+
+#else
+    /* The CMAC functionality was introduced in OpenSSL 1.0.1
+     * Although OTP requires at least version 0.9.8, the versions 0.9.8 and 1.0.0 are
+     * no longer maintained. */
+    return atom_notsup;
+#endif
+}
+