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// Copyright 2017 The BoringSSL Authors
//
// 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
//
// https://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.
#include <contrib/restricted/google/boringssl/include/openssl/cipher.h>
#include <string.h>
#include <contrib/restricted/google/boringssl/include/openssl/aes.h>
#include <contrib/restricted/google/boringssl/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 = reinterpret_cast<EVP_CFB_CTX *>(ctx->cipher_data);
AES_set_encrypt_key(key, ctx->key_len * 8, &cfb_ctx->ks);
}
return 1;
}
static int aes_cfb128_cipher_update(EVP_CIPHER_CTX *ctx, uint8_t *out,
const uint8_t *in, size_t len) {
if (!out || !in) {
return 0;
}
EVP_CFB_CTX *cfb_ctx = reinterpret_cast<EVP_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_update= */ aes_cfb128_cipher_update,
/* cipher_final= */ nullptr,
/* update_aad= */ nullptr,
/* cleanup= */ nullptr,
/* ctrl= */ nullptr,
};
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_update= */ aes_cfb128_cipher_update,
/* cipher_final= */ nullptr,
/* update_aad= */ nullptr,
/* cleanup= */ nullptr,
/* ctrl= */ nullptr,
};
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_update,
/* cipher_final= */ nullptr,
/* update_aad= */ nullptr,
/* cleanup= */ nullptr,
/* ctrl= */ nullptr,
};
const EVP_CIPHER *EVP_aes_128_cfb128() { return &aes_128_cfb128; }
const EVP_CIPHER *EVP_aes_128_cfb() { return &aes_128_cfb128; }
const EVP_CIPHER *EVP_aes_192_cfb128() { return &aes_192_cfb128; }
const EVP_CIPHER *EVP_aes_192_cfb() { return &aes_192_cfb128; }
const EVP_CIPHER *EVP_aes_256_cfb128() { return &aes_256_cfb128; }
const EVP_CIPHER *EVP_aes_256_cfb() { return &aes_256_cfb128; }
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