// 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 #include #include #include #include "../../internal.h" #include "../../fipsmodule/cipher/internal.h" // MAXBITCHUNK is used in |aes_cfb1_cipher| to avoid overflow because // |AES_cfb1_encrypt| operates data on bit level. #define MAXBITCHUNK ((size_t)1<<(sizeof(size_t)*8-4)) 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 = (EVP_CFB_CTX *)ctx->cipher_data; AES_set_encrypt_key(key, ctx->key_len * 8, &cfb_ctx->ks); } return 1; } static int aes_cfb1_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 = (EVP_CFB_CTX *)ctx->cipher_data; if (ctx->flags & EVP_CIPH_FLAG_LENGTH_BITS) { int num = ctx->num; AES_cfb1_encrypt(in, out, len, &cfb_ctx->ks, ctx->iv, &num, ctx->encrypt ? AES_ENCRYPT : AES_DECRYPT); ctx->num = num; return 1; } while (len >= MAXBITCHUNK) { int num = ctx->num; AES_cfb1_encrypt(in, out, MAXBITCHUNK * 8, &cfb_ctx->ks, ctx->iv, &num, ctx->encrypt ? AES_ENCRYPT : AES_DECRYPT); ctx->num = num; len -= MAXBITCHUNK; out += MAXBITCHUNK; in += MAXBITCHUNK; } if (len) { int num = ctx->num; AES_cfb1_encrypt(in, out, len * 8, &cfb_ctx->ks, ctx->iv, &num, ctx->encrypt ? AES_ENCRYPT : AES_DECRYPT); ctx->num = num; } return 1; } static int aes_cfb8_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 = (EVP_CFB_CTX *)ctx->cipher_data; int num = ctx->num; AES_cfb8_encrypt(in, out, len, &cfb_ctx->ks, ctx->iv, &num, ctx->encrypt ? AES_ENCRYPT : AES_DECRYPT); ctx->num = num; 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 = (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_cfb1 = { NID_aes_128_cfb1, 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_cfb1_cipher, NULL /* cleanup */, NULL /* ctrl */, }; static const EVP_CIPHER aes_128_cfb8 = { NID_aes_128_cfb8, 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_cfb8_cipher, NULL /* cleanup */, NULL /* ctrl */, }; 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_192_cfb1 = { NID_aes_192_cfb1, 1 /* block_size */, 24 /* key_size */, 16 /* iv_len */, sizeof(EVP_CFB_CTX), EVP_CIPH_CFB_MODE, NULL /* app_data */, aes_cfb_init_key, aes_cfb1_cipher, NULL /* cleanup */, NULL /* ctrl */, }; static const EVP_CIPHER aes_192_cfb8 = { NID_aes_192_cfb8, 1 /* block_size */, 24 /* key_size */, 16 /* iv_len */, sizeof(EVP_CFB_CTX), EVP_CIPH_CFB_MODE, NULL /* app_data */, aes_cfb_init_key, aes_cfb8_cipher, NULL /* cleanup */, NULL /* ctrl */, }; static const EVP_CIPHER aes_192_cfb128 = { NID_aes_192_cfb128, 1 /* block_size */, 24 /* 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_cfb1 = { NID_aes_256_cfb1, 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_cfb1_cipher, NULL /* cleanup */, NULL /* ctrl */, }; static const EVP_CIPHER aes_256_cfb8 = { NID_aes_256_cfb8, 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_cfb8_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_cfb1(void) { return &aes_128_cfb1; } const EVP_CIPHER *EVP_aes_128_cfb8(void) { return &aes_128_cfb8; } 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_cfb1(void) { return &aes_192_cfb1; } const EVP_CIPHER *EVP_aes_192_cfb8(void) { return &aes_192_cfb8; } 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_cfb1(void) { return &aes_256_cfb1; } const EVP_CIPHER *EVP_aes_256_cfb8(void) { return &aes_256_cfb8; } const EVP_CIPHER *EVP_aes_256_cfb128(void) { return &aes_256_cfb128; } const EVP_CIPHER *EVP_aes_256_cfb(void) { return &aes_256_cfb128; }