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-rw-r--r--lib/crypto/c_src/cmac.c70
1 files changed, 70 insertions, 0 deletions
diff --git a/lib/crypto/c_src/cmac.c b/lib/crypto/c_src/cmac.c
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+++ b/lib/crypto/c_src/cmac.c
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+/*
+ * %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;
+ ErlNifBinary key;
+ ErlNifBinary data;
+ ERL_NIF_TERM ret;
+ size_t ret_size;
+
+ if (!enif_inspect_iolist_as_binary(env, argv[1], &key)
+ || !(cipherp = get_cipher_type(argv[0], key.size))
+ || !enif_inspect_iolist_as_binary(env, argv[2], &data)) {
+ return enif_make_badarg(env);
+ }
+ cipher = cipherp->cipher.p;
+ if (!cipher) {
+ return enif_raise_exception(env, atom_notsup);
+ }
+
+ ctx = CMAC_CTX_new();
+ if (!CMAC_Init(ctx, key.data, key.size, cipher, NULL)) {
+ CMAC_CTX_free(ctx);
+ return atom_notsup;
+ }
+
+ if (!CMAC_Update(ctx, data.data, data.size) ||
+ !CMAC_Final(ctx,
+ enif_make_new_binary(env, EVP_CIPHER_block_size(cipher), &ret),
+ &ret_size)) {
+ CMAC_CTX_free(ctx);
+ return atom_notsup;
+ }
+ ASSERT(ret_size == (unsigned)EVP_CIPHER_block_size(cipher));
+
+ CMAC_CTX_free(ctx);
+ CONSUME_REDS(env, data);
+ 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+ * no longer maintained.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
+}
+