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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 iv */ void av_aes_ctr_set_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 */