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