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| Rev | Author | Line No. | Line |
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| 6147 | serge | 1 | /* |
| 2 | * A 32-bit implementation of the TEA algorithm |
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| 3 | * Copyright (c) 2015 Vesselin Bontchev |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | #ifndef AVUTIL_TEA_H |
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| 23 | #define AVUTIL_TEA_H |
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| 24 | |||
| 25 | #include |
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| 26 | |||
| 27 | /** |
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| 28 | * @file |
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| 29 | * @brief Public header for libavutil TEA algorithm |
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| 30 | * @defgroup lavu_tea TEA |
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| 31 | * @ingroup lavu_crypto |
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| 32 | * @{ |
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| 33 | */ |
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| 34 | |||
| 35 | extern const int av_tea_size; |
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| 36 | |||
| 37 | struct AVTEA; |
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| 38 | |||
| 39 | /** |
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| 40 | * Allocate an AVTEA context |
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| 41 | * To free the struct: av_free(ptr) |
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| 42 | */ |
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| 43 | struct AVTEA *av_tea_alloc(void); |
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| 44 | |||
| 45 | /** |
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| 46 | * Initialize an AVTEA context. |
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| 47 | * |
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| 48 | * @param ctx an AVTEA context |
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| 49 | * @param key a key of 16 bytes used for encryption/decryption |
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| 50 | * @param rounds the number of rounds in TEA (64 is the "standard") |
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| 51 | */ |
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| 52 | void av_tea_init(struct AVTEA *ctx, const uint8_t key[16], int rounds); |
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| 53 | |||
| 54 | /** |
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| 55 | * Encrypt or decrypt a buffer using a previously initialized context. |
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| 56 | * |
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| 57 | * @param ctx an AVTEA context |
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| 58 | * @param dst destination array, can be equal to src |
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| 59 | * @param src source array, can be equal to dst |
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| 60 | * @param count number of 8 byte blocks |
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| 61 | * @param iv initialization vector for CBC mode, if NULL then ECB will be used |
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| 62 | * @param decrypt 0 for encryption, 1 for decryption |
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| 63 | */ |
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| 64 | void av_tea_crypt(struct AVTEA *ctx, uint8_t *dst, const uint8_t *src, |
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| 65 | int count, uint8_t *iv, int decrypt); |
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| 66 | |||
| 67 | /** |
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| 68 | * @} |
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| 69 | */ |
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| 70 | |||
| 71 | #endif /* AVUTIL_TEA_H */ |