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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6148 | serge | 1 | /* |
| 2 | * Blowfish algorithm |
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| 3 | * Copyright (c) 2012 Samuel Pitoiset |
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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_BLOWFISH_H |
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| 23 | #define AVUTIL_BLOWFISH_H |
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| 24 | |||
| 25 | #include |
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| 26 | |||
| 27 | /** |
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| 28 | * @defgroup lavu_blowfish Blowfish |
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| 29 | * @ingroup lavu_crypto |
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| 30 | * @{ |
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| 31 | */ |
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| 32 | |||
| 33 | #define AV_BF_ROUNDS 16 |
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| 34 | |||
| 35 | typedef struct AVBlowfish { |
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| 36 | uint32_t p[AV_BF_ROUNDS + 2]; |
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| 37 | uint32_t s[4][256]; |
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| 38 | } AVBlowfish; |
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| 39 | |||
| 40 | /** |
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| 41 | * Initialize an AVBlowfish context. |
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| 42 | * |
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| 43 | * @param ctx an AVBlowfish context |
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| 44 | * @param key a key |
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| 45 | * @param key_len length of the key |
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| 46 | */ |
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| 47 | void av_blowfish_init(struct AVBlowfish *ctx, const uint8_t *key, int key_len); |
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| 48 | |||
| 49 | /** |
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| 50 | * Encrypt or decrypt a buffer using a previously initialized context. |
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| 51 | * |
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| 52 | * @param ctx an AVBlowfish context |
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| 53 | * @param xl left four bytes halves of input to be encrypted |
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| 54 | * @param xr right four bytes halves of input to be encrypted |
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| 55 | * @param decrypt 0 for encryption, 1 for decryption |
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| 56 | */ |
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| 57 | void av_blowfish_crypt_ecb(struct AVBlowfish *ctx, uint32_t *xl, uint32_t *xr, |
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| 58 | int decrypt); |
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| 59 | |||
| 60 | /** |
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| 61 | * Encrypt or decrypt a buffer using a previously initialized context. |
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| 62 | * |
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| 63 | * @param ctx an AVBlowfish context |
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| 64 | * @param dst destination array, can be equal to src |
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| 65 | * @param src source array, can be equal to dst |
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| 66 | * @param count number of 8 byte blocks |
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| 67 | * @param iv initialization vector for CBC mode, if NULL ECB will be used |
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| 68 | * @param decrypt 0 for encryption, 1 for decryption |
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| 69 | */ |
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| 70 | void av_blowfish_crypt(struct AVBlowfish *ctx, uint8_t *dst, const uint8_t *src, |
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| 71 | int count, uint8_t *iv, int decrypt); |
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| 72 | |||
| 73 | /** |
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| 74 | * @} |
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| 75 | */ |
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| 76 | |||
| 77 | #endif /* AVUTIL_BLOWFISH_H */ |