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| | | /* |
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| | | * An implementation of the TwoFish algorithm |
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| | | * Copyright (c) 2015 Supraja Meedinti |
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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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| | | |
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| | | #ifndef AVUTIL_TWOFISH_H |
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| | | #define AVUTIL_TWOFISH_H |
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| | | |
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| | | #include <stdint.h> |
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| | | |
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| | | |
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| | | /** |
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| | | * @file |
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| | | * @brief Public header for libavutil TWOFISH algorithm |
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| | | * @defgroup lavu_twofish TWOFISH |
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| | | * @ingroup lavu_crypto |
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| | | * @{ |
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| | | */ |
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| | | |
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| | | extern const int av_twofish_size; |
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| | | |
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| | | struct AVTWOFISH; |
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| | | |
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| | | /** |
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| | | * Allocate an AVTWOFISH context |
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| | | * To free the struct: av_free(ptr) |
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| | | */ |
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| | | struct AVTWOFISH *av_twofish_alloc(void); |
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| | | |
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| | | /** |
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| | | * Initialize an AVTWOFISH context. |
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| | | * |
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| | | * @param ctx an AVTWOFISH context |
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| | | * @param key a key of size ranging from 1 to 32 bytes used for encryption/decryption |
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| | | * @param key_bits number of keybits: 128, 192, 256 If less than the required, padded with zeroes to nearest valid value; return value is 0 if key_bits is 128/192/256, -1 if less than 0, 1 otherwise |
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| | | */ |
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| | | int av_twofish_init(struct AVTWOFISH *ctx, const uint8_t *key, int key_bits); |
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| | | |
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| | | /** |
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| | | * Encrypt or decrypt a buffer using a previously initialized context |
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| | | * |
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| | | * @param ctx an AVTWOFISH 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 count number of 16 byte blocks |
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| | | * @paran iv initialization vector for CBC mode, NULL for ECB mode |
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| | | * @param decrypt 0 for encryption, 1 for decryption |
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| | | */ |
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| | | void av_twofish_crypt(struct AVTWOFISH *ctx, uint8_t *dst, const uint8_t *src, int count, uint8_t* iv, int decrypt); |
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| | | |
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| | | /** |
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| | | * @} |
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| | | */ |
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| | | #endif /* AVUTIL_TWOFISH_H */ |
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