69 lines
2.3 KiB
C
69 lines
2.3 KiB
C
|
// Copyright (c) 2017, Google Inc.
|
||
|
|
//
|
||
|
|
// Permission to use, copy, modify, and/or distribute this software for any
|
||
|
|
// purpose with or without fee is hereby granted, provided that the above
|
||
|
|
// copyright notice and this permission notice appear in all copies.
|
||
|
|
//
|
||
|
|
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
||
|
|
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
||
|
|
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
|
||
|
|
// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
||
|
|
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
|
||
|
|
// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
|
||
|
|
// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
|
||
|
|
|
||
|
|
#include <openssl/cipher.h>
|
||
|
|
|
||
|
|
#include <string.h>
|
||
|
|
|
||
|
|
#include <openssl/aes.h>
|
||
|
|
#include <openssl/obj.h>
|
||
|
|
|
||
|
|
#include "../../crypto/internal.h"
|
||
|
|
|
||
|
|
typedef struct {
|
||
|
|
AES_KEY ks;
|
||
|
|
} EVP_CFB_CTX;
|
||
|
|
|
||
|
|
static int aes_cfb_init_key(EVP_CIPHER_CTX *ctx, const uint8_t *key,
|
||
|
|
const uint8_t *iv, int enc) {
|
||
|
|
if (key) {
|
||
|
|
EVP_CFB_CTX *cfb_ctx = ctx->cipher_data;
|
||
|
|
AES_set_encrypt_key(key, ctx->key_len * 8, &cfb_ctx->ks);
|
||
|
|
}
|
||
|
|
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int aes_cfb128_cipher(EVP_CIPHER_CTX *ctx, uint8_t *out,
|
||
|
|
const uint8_t *in, size_t len) {
|
||
|
|
if (!out || !in) {
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
EVP_CFB_CTX *cfb_ctx = ctx->cipher_data;
|
||
|
|
int num = ctx->num;
|
||
|
|
AES_cfb128_encrypt(in, out, len, &cfb_ctx->ks, ctx->iv, &num,
|
||
|
|
ctx->encrypt ? AES_ENCRYPT : AES_DECRYPT);
|
||
|
|
ctx->num = num;
|
||
|
|
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const EVP_CIPHER aes_128_cfb128 = {
|
||
|
|
NID_aes_128_cfb128, 1 /* block_size */, 16 /* key_size */,
|
||
|
|
16 /* iv_len */, sizeof(EVP_CFB_CTX), EVP_CIPH_CFB_MODE,
|
||
|
|
NULL /* app_data */, aes_cfb_init_key, aes_cfb128_cipher,
|
||
|
|
NULL /* cleanup */, NULL /* ctrl */,
|
||
|
|
};
|
||
|
|
|
||
|
|
static const EVP_CIPHER aes_256_cfb128 = {
|
||
|
|
NID_aes_256_cfb128, 1 /* block_size */, 32 /* key_size */,
|
||
|
|
16 /* iv_len */, sizeof(EVP_CFB_CTX), EVP_CIPH_CFB_MODE,
|
||
|
|
NULL /* app_data */, aes_cfb_init_key, aes_cfb128_cipher,
|
||
|
|
NULL /* cleanup */, NULL /* ctrl */,
|
||
|
|
};
|
||
|
|
|
||
|
|
const EVP_CIPHER *EVP_aes_128_cfb128(void) { return &aes_128_cfb128; }
|
||
|
|
const EVP_CIPHER *EVP_aes_256_cfb128(void) { return &aes_256_cfb128; }
|