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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 "block.h"
#include "aes.h"
#include "cipher.h"
ERL_NIF_TERM block_crypt_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{/* (Type, Key, Ivec, Text, IsEncrypt) or (Type, Key, Text, IsEncrypt) */
const struct cipher_type_t *cipherp;
const EVP_CIPHER *cipher;
ErlNifBinary key, ivec, text;
EVP_CIPHER_CTX *ctx = NULL;
ERL_NIF_TERM ret;
unsigned char *out;
int ivec_size, out_size = 0;
int cipher_len;
ASSERT(argc == 4 || argc == 5);
if (!enif_inspect_iolist_as_binary(env, argv[1], &key))
goto bad_arg;
if (key.size > INT_MAX)
goto bad_arg;
if ((cipherp = get_cipher_type(argv[0], key.size)) == NULL)
goto bad_arg;
if (cipherp->flags & (NON_EVP_CIPHER | AEAD_CIPHER))
goto bad_arg;
if (!enif_inspect_iolist_as_binary(env, argv[argc - 2], &text))
goto bad_arg;
if (text.size > INT_MAX)
goto bad_arg;
if (FORBIDDEN_IN_FIPS(cipherp))
return enif_raise_exception(env, atom_notsup);
if ((cipher = cipherp->cipher.p) == NULL)
return enif_raise_exception(env, atom_notsup);
if (cipherp->flags & AES_CFBx) {
if (argv[0] == atom_aes_cfb8
&& (key.size == 24 || key.size == 32)) {
/* Why do EVP_CIPHER_CTX_set_key_length() fail on these key sizes?
* Fall back on low level API
*/
return aes_cfb_8_crypt(env, argc-1, argv+1);
}
else if (argv[0] == atom_aes_cfb128
&& (key.size == 24 || key.size == 32)) {
/* Why do EVP_CIPHER_CTX_set_key_length() fail on these key sizes?
* Fall back on low level API
*/
return aes_cfb_128_crypt_nif(env, argc-1, argv+1);
}
}
ivec_size = EVP_CIPHER_iv_length(cipher);
#ifdef HAVE_ECB_IVEC_BUG
if (cipherp->flags & ECB_BUG_0_9_8L)
ivec_size = 0; /* 0.9.8l returns faulty ivec_size */
#endif
if (ivec_size < 0)
goto bad_arg;
if ((cipher_len = EVP_CIPHER_block_size(cipher)) < 0)
goto bad_arg;
if (text.size % (size_t)cipher_len != 0)
goto bad_arg;
if (ivec_size == 0) {
if (argc != 4)
goto bad_arg;
} else {
if (argc != 5)
goto bad_arg;
if (!enif_inspect_iolist_as_binary(env, argv[2], &ivec))
goto bad_arg;
if (ivec.size != (size_t)ivec_size)
goto bad_arg;
}
if ((out = enif_make_new_binary(env, text.size, &ret)) == NULL)
goto err;
if ((ctx = EVP_CIPHER_CTX_new()) == NULL)
goto err;
if (!EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL,
(argv[argc - 1] == atom_true)))
goto err;
if (!EVP_CIPHER_CTX_set_key_length(ctx, (int)key.size))
goto err;
if (EVP_CIPHER_type(cipher) == NID_rc2_cbc) {
if (key.size > INT_MAX / 8)
goto err;
if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_SET_RC2_KEY_BITS, (int)key.size * 8, NULL))
goto err;
}
if (!EVP_CipherInit_ex(ctx, NULL, NULL, key.data,
ivec_size ? ivec.data : NULL, -1))
goto err;
if (!EVP_CIPHER_CTX_set_padding(ctx, 0))
goto err;
/* OpenSSL 0.9.8h asserts text.size > 0 */
if (text.size > 0) {
if (!EVP_CipherUpdate(ctx, out, &out_size, text.data, (int)text.size))
goto err;
if (ASSERT(out_size == text.size), 0)
goto err;
if (!EVP_CipherFinal_ex(ctx, out + out_size, &out_size))
goto err;
}
ASSERT(out_size == 0);
CONSUME_REDS(env, text);
goto done;
bad_arg:
ret = enif_make_badarg(env);
goto done;
err:
ret = enif_raise_exception(env, atom_notsup);
done:
if (ctx)
EVP_CIPHER_CTX_free(ctx);
return ret;
}
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