| /* |
| * AES-CTR cipher |
| * Copyright (c) 2015 Eran Kornblau <erankor at gmail dot com> |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #ifndef AVUTIL_AES_CTR_H |
| #define AVUTIL_AES_CTR_H |
| |
| #include <stdint.h> |
| |
| #include "attributes.h" |
| #include "version.h" |
| |
| #define AES_CTR_KEY_SIZE (16) |
| #define AES_CTR_IV_SIZE (8) |
| |
| struct AVAESCTR; |
| |
| /** |
| * Allocate an AVAESCTR context. |
| */ |
| struct AVAESCTR *av_aes_ctr_alloc(void); |
| |
| /** |
| * Initialize an AVAESCTR context. |
| * @param key encryption key, must have a length of AES_CTR_KEY_SIZE |
| */ |
| int av_aes_ctr_init(struct AVAESCTR *a, const uint8_t *key); |
| |
| /** |
| * Release an AVAESCTR context. |
| */ |
| void av_aes_ctr_free(struct AVAESCTR *a); |
| |
| /** |
| * Process a buffer using a previously initialized context. |
| * @param dst destination array, can be equal to src |
| * @param src source array, can be equal to dst |
| * @param size the size of src and dst |
| */ |
| void av_aes_ctr_crypt(struct AVAESCTR *a, uint8_t *dst, const uint8_t *src, int size); |
| |
| /** |
| * Get the current iv |
| */ |
| const uint8_t* av_aes_ctr_get_iv(struct AVAESCTR *a); |
| |
| /** |
| * Generate a random iv |
| */ |
| void av_aes_ctr_set_random_iv(struct AVAESCTR *a); |
| |
| /** |
| * Forcefully change the 8-byte iv |
| */ |
| void av_aes_ctr_set_iv(struct AVAESCTR *a, const uint8_t* iv); |
| |
| /** |
| * Forcefully change the "full" 16-byte iv, including the counter |
| */ |
| void av_aes_ctr_set_full_iv(struct AVAESCTR *a, const uint8_t* iv); |
| |
| /** |
| * Increment the top 64 bit of the iv (performed after each frame) |
| */ |
| void av_aes_ctr_increment_iv(struct AVAESCTR *a); |
| |
| /** |
| * @} |
| */ |
| |
| #endif /* AVUTIL_AES_CTR_H */ |