e64ef27cbe
Change-Id: I37a438b5b4b18d18756ba4aeb9f8548caa333981 Reviewed-on: https://boringssl-review.googlesource.com/20384 Reviewed-by: David Benjamin <davidben@google.com> Commit-Queue: David Benjamin <davidben@google.com> CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
61 lines
1.9 KiB
C
61 lines
1.9 KiB
C
// Copyright (c) 2017, Google Inc.
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice appear in all copies.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
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#include <openssl/cipher.h>
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#include <string.h>
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#include <openssl/aes.h>
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#include <openssl/obj.h>
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#include "../../crypto/internal.h"
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typedef struct {
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AES_KEY ks;
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} EVP_CFB_CTX;
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static int aes_cfb_init_key(EVP_CIPHER_CTX *ctx, const uint8_t *key,
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const uint8_t *iv, int enc) {
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if (key) {
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EVP_CFB_CTX *cfb_ctx = ctx->cipher_data;
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AES_set_encrypt_key(key, ctx->key_len * 8, &cfb_ctx->ks);
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}
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return 1;
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}
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static int aes_cfb128_cipher(EVP_CIPHER_CTX *ctx, uint8_t *out,
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const uint8_t *in, size_t len) {
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if (!out || !in) {
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return 0;
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}
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EVP_CFB_CTX *cfb_ctx = ctx->cipher_data;
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int num = ctx->num;
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AES_cfb128_encrypt(in, out, len, &cfb_ctx->ks, ctx->iv, &num,
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ctx->encrypt ? AES_ENCRYPT : AES_DECRYPT);
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ctx->num = num;
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return 1;
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}
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static const EVP_CIPHER aes_128_cfb128 = {
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NID_aes_128_cfb128, 1 /* block_size */, 16 /* key_size */,
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16 /* iv_len */, sizeof(EVP_CFB_CTX), EVP_CIPH_CFB_MODE,
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NULL /* app_data */, aes_cfb_init_key, aes_cfb128_cipher,
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NULL /* cleanup */, NULL /* ctrl */,
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};
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const EVP_CIPHER *EVP_aes_128_cfb128(void) { return &aes_128_cfb128; }
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