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/*
* Copyright (C) 2018 René Korthaus
* Copyright (C) 2018 Konstantinos Kolelis
* Copyright (C) 2018 Tobias Hommel
* Rohde & Schwarz Cybersecurity GmbH
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "botan_crypter.h"
#include <botan/build.h>
#if defined(BOTAN_HAS_AES) && defined(BOTAN_HAS_MODE_CBC)
#include <botan/ffi.h>
typedef struct private_botan_crypter_t private_botan_crypter_t;
/**
* Private data of botan_crypter_t
*/
struct private_botan_crypter_t {
/**
* Public part of this class
*/
botan_crypter_t public;
/**
* The key
*/
chunk_t key;
/**
* The cipher name
*/
const char* cipher_name;
};
/**
* Do the actual en/decryption
*/
static bool crypt(private_botan_crypter_t *this, chunk_t data, chunk_t iv,
chunk_t *dst, uint32_t init_flag)
{
botan_cipher_t cipher;
size_t output_written = 0;
size_t input_consumed = 0;
uint8_t *in, *out;
bool success = FALSE;
in = data.ptr;
if (dst)
{
*dst = chunk_alloc(data.len);
out = dst->ptr;
}
else
{
out = data.ptr;
}
if (botan_cipher_init(&cipher, this->cipher_name, init_flag))
{
return FALSE;
}
if (!botan_cipher_set_key(cipher, this->key.ptr, this->key.len) &&
!botan_cipher_start(cipher, iv.ptr, iv.len) &&
!botan_cipher_update(cipher, BOTAN_CIPHER_UPDATE_FLAG_FINAL, out,
data.len, &output_written, in, data.len,
&input_consumed) &&
(output_written == input_consumed))
{
success = TRUE;
}
botan_cipher_destroy(cipher);
return success;
}
METHOD(crypter_t, decrypt, bool,
private_botan_crypter_t *this, chunk_t data, chunk_t iv, chunk_t *dst)
{
return crypt(this, data, iv, dst, BOTAN_CIPHER_INIT_FLAG_DECRYPT);
}
METHOD(crypter_t, encrypt, bool,
private_botan_crypter_t *this, chunk_t data, chunk_t iv, chunk_t *dst)
{
return crypt(this, data, iv, dst, BOTAN_CIPHER_INIT_FLAG_ENCRYPT);
}
METHOD(crypter_t, get_block_size, size_t,
private_botan_crypter_t *this)
{
return AES_BLOCK_SIZE;
}
METHOD(crypter_t, get_iv_size, size_t,
private_botan_crypter_t *this)
{
return AES_BLOCK_SIZE;
}
METHOD(crypter_t, get_key_size, size_t,
private_botan_crypter_t *this)
{
return this->key.len;
}
METHOD(crypter_t, set_key, bool,
private_botan_crypter_t *this, chunk_t key)
{
memcpy(this->key.ptr, key.ptr, min(key.len, this->key.len));
return TRUE;
}
METHOD(crypter_t, destroy, void,
private_botan_crypter_t *this)
{
chunk_clear(&this->key);
free(this);
}
/*
* Described in header
*/
botan_crypter_t *botan_crypter_create(encryption_algorithm_t algo,
size_t key_size)
{
private_botan_crypter_t *this;
INIT(this,
.public = {
.crypter = {
.encrypt = _encrypt,
.decrypt = _decrypt,
.get_block_size = _get_block_size,
.get_iv_size = _get_iv_size,
.get_key_size = _get_key_size,
.set_key = _set_key,
.destroy = _destroy,
},
},
);
switch (algo)
{
case ENCR_AES_CBC:
switch (key_size)
{
case 16:
/* AES 128 */
this->cipher_name = "AES-128/CBC/NoPadding";
break;
case 24:
/* AES-192 */
this->cipher_name = "AES-192/CBC/NoPadding";
break;
case 32:
/* AES-256 */
this->cipher_name = "AES-256/CBC/NoPadding";
break;
default:
free(this);
return NULL;
}
break;
default:
free(this);
return NULL;
}
this->key = chunk_alloc(key_size);
return &this->public;
}
#endif
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