mirror of
https://github.com/FFmpeg/FFmpeg.git
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23ac99dc17
for supporting mp4 cenc encoding/decoding Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
84 lines
2.1 KiB
C
84 lines
2.1 KiB
C
/*
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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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#include "version.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 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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* 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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