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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 "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;
EVP_PKEY *key = NULL;
EVP_MD_CTX *mctx = NULL;
EVP_PKEY_CTX *pctx = NULL;
const EVP_MD *md = NULL;
size_t size;
int ret_bin_alloc = 0;
ASSERT(argc == 2);
if (!enif_inspect_binary(env, argv[0], &key_bin))
goto bad_arg;
if (key_bin.size != 32)
goto bad_arg;
if (!enif_inspect_binary(env, argv[1], &text))
goto bad_arg;
if ((key = EVP_PKEY_new_raw_private_key(EVP_PKEY_POLY1305, /*engine*/ NULL, key_bin.data, key_bin.size)) == NULL)
goto err;
if ((mctx = EVP_MD_CTX_new()) == NULL)
goto err;
if (EVP_DigestSignInit(mctx, &pctx, md, /*engine*/ NULL, key) != 1)
goto err;
if (EVP_DigestSignUpdate(mctx, text.data, text.size) != 1)
goto err;
if (EVP_DigestSignFinal(mctx, NULL, &size) != 1)
goto err;
if (!enif_alloc_binary(size, &ret_bin))
goto err;
ret_bin_alloc = 1;
if (EVP_DigestSignFinal(mctx, ret_bin.data, &size) != 1)
goto err;
if (size != ret_bin.size) {
if (!enif_realloc_binary(&ret_bin, size))
goto err;
}
ret = enif_make_binary(env, &ret_bin);
ret_bin_alloc = 0;
goto done;
bad_arg:
return enif_make_badarg(env);
err:
if (ret_bin_alloc)
enif_release_binary(&ret_bin);
ret = atom_error;
done:
if (mctx)
EVP_MD_CTX_free(mctx);
if (key)
EVP_PKEY_free(key);
return ret;
#else
return enif_raise_exception(env, atom_notsup);
#endif
}
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