blob: 441ebe63f4a31edd5ed9d187ac6db26bf081629d [file] [log] [blame]
// 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; }