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| | | /* |
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| | | * A 32-bit implementation of the TEA algorithm |
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| | | * Copyright (c) 2015 Vesselin Bontchev |
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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_TEA_H |
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| | | #define AVUTIL_TEA_H |
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| | | |
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| | | #include <stdint.h> |
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| | | |
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| | | /** |
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| | | * @file |
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| | | * @brief Public header for libavutil TEA algorithm |
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| | | * @defgroup lavu_tea TEA |
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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_tea_size; |
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| | | |
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| | | struct AVTEA; |
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| | | |
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| | | /** |
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| | | * Allocate an AVTEA context |
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| | | * To free the struct: av_free(ptr) |
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| | | */ |
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| | | struct AVTEA *av_tea_alloc(void); |
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| | | |
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| | | /** |
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| | | * Initialize an AVTEA context. |
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| | | * |
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| | | * @param ctx an AVTEA context |
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| | | * @param key a key of 16 bytes used for encryption/decryption |
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| | | * @param rounds the number of rounds in TEA (64 is the "standard") |
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| | | */ |
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| | | void av_tea_init(struct AVTEA *ctx, const uint8_t key[16], int rounds); |
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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 AVTEA 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 8 byte blocks |
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| | | * @param iv initialization vector for CBC mode, if NULL then ECB will be used |
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| | | * @param decrypt 0 for encryption, 1 for decryption |
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| | | */ |
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| | | void av_tea_crypt(struct AVTEA *ctx, uint8_t *dst, const uint8_t *src, |
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| | | 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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| | | |
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| | | #endif /* AVUTIL_TEA_H */ |
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