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| | |
| | | /* |
| | | * 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 */ |