blob: 0ac32288cfac1652c11785a154b0eee9b5015212 [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/fipsmodule/cipher/internal.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 = NID_aes_128_cfb128,
.block_size = 1,
.key_len = 16,
.iv_len = 16,
.ctx_size = sizeof(EVP_CFB_CTX),
.flags = EVP_CIPH_CFB_MODE,
.init = aes_cfb_init_key,
.cipher = aes_cfb128_cipher,
};
static const EVP_CIPHER aes_192_cfb128 = {
.nid = NID_aes_192_cfb128,
.block_size = 1,
.key_len = 24,
.iv_len = 16,
.ctx_size = sizeof(EVP_CFB_CTX),
.flags = EVP_CIPH_CFB_MODE,
.init = aes_cfb_init_key,
.cipher = aes_cfb128_cipher,
};
static const EVP_CIPHER aes_256_cfb128 = {
.nid = NID_aes_256_cfb128,
.block_size = 1,
.key_len = 32,
.iv_len = 16,
.ctx_size = sizeof(EVP_CFB_CTX),
.flags = EVP_CIPH_CFB_MODE,
.init = aes_cfb_init_key,
.cipher = aes_cfb128_cipher,
};
const EVP_CIPHER *EVP_aes_128_cfb128(void) { return &aes_128_cfb128; }
const EVP_CIPHER *EVP_aes_128_cfb(void) { return &aes_128_cfb128; }
const EVP_CIPHER *EVP_aes_192_cfb128(void) { return &aes_192_cfb128; }
const EVP_CIPHER *EVP_aes_192_cfb(void) { return &aes_192_cfb128; }
const EVP_CIPHER *EVP_aes_256_cfb128(void) { return &aes_256_cfb128; }
const EVP_CIPHER *EVP_aes_256_cfb(void) { return &aes_256_cfb128; }