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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 "chacha20.h"
#include "cipher.h"
ERL_NIF_TERM chacha20_stream_init(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{/* (Key, IV) */
#if defined(HAVE_CHACHA20)
ErlNifBinary key_bin, ivec_bin;
struct evp_cipher_ctx *ctx = NULL;
const EVP_CIPHER *cipher;
ERL_NIF_TERM ret;
ASSERT(argc == 2);
if (!enif_inspect_iolist_as_binary(env, argv[0], &key_bin))
goto bad_arg;
if (key_bin.size != 32)
goto bad_arg;
if (!enif_inspect_binary(env, argv[1], &ivec_bin))
goto bad_arg;
if (ivec_bin.size != 16)
goto bad_arg;
cipher = EVP_chacha20();
if ((ctx = enif_alloc_resource(evp_cipher_ctx_rtype, sizeof(struct evp_cipher_ctx))) == NULL)
goto err;
if ((ctx->ctx = EVP_CIPHER_CTX_new()) == NULL)
goto err;
if (EVP_CipherInit_ex(ctx->ctx, cipher, NULL,
key_bin.data, ivec_bin.data, 1) != 1)
goto err;
if (EVP_CIPHER_CTX_set_padding(ctx->ctx, 0) != 1)
goto err;
ret = enif_make_resource(env, ctx);
goto done;
bad_arg:
return enif_make_badarg(env);
err:
ret = enif_make_badarg(env);
done:
if (ctx)
enif_release_resource(ctx);
return ret;
#else
return enif_raise_exception(env, atom_notsup);
#endif
}
ERL_NIF_TERM chacha20_stream_crypt(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{/* (State, Data) */
#if defined(HAVE_CHACHA20)
struct evp_cipher_ctx *ctx = NULL, *new_ctx = NULL;
ErlNifBinary data_bin;
ERL_NIF_TERM ret, cipher_term;
unsigned char *out;
int outl = 0;
ASSERT(argc == 2);
if (!enif_get_resource(env, argv[0], evp_cipher_ctx_rtype, (void**)&ctx))
goto bad_arg;
if (!enif_inspect_iolist_as_binary(env, argv[1], &data_bin))
goto bad_arg;
if (data_bin.size > INT_MAX)
goto bad_arg;
if ((new_ctx = enif_alloc_resource(evp_cipher_ctx_rtype, sizeof(struct evp_cipher_ctx))) == NULL)
goto err;
if ((new_ctx->ctx = EVP_CIPHER_CTX_new()) == NULL)
goto err;
if (EVP_CIPHER_CTX_copy(new_ctx->ctx, ctx->ctx) != 1)
goto err;
if ((out = enif_make_new_binary(env, data_bin.size, &cipher_term)) == NULL)
goto err;
if (EVP_CipherUpdate(new_ctx->ctx, out, &outl, data_bin.data, (int)data_bin.size) != 1)
goto err;
ASSERT(outl >= 0 && (size_t)outl == data_bin.size);
ret = enif_make_tuple2(env, enif_make_resource(env, new_ctx), cipher_term);
CONSUME_REDS(env, data_bin);
goto done;
bad_arg:
return enif_make_badarg(env);
err:
ret = enif_make_badarg(env);
done:
if (new_ctx)
enif_release_resource(new_ctx);
return ret;
#else
return enif_raise_exception(env, atom_notsup);
#endif
}
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