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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * DES encryption/decryption |
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| 3 | * Copyright (c) 2007 Reimar Doeffinger |
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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_DES_H |
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| 23 | #define AVUTIL_DES_H |
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| 24 | |||
| 25 | #include |
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| 26 | |||
| 27 | struct AVDES { |
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| 28 | uint64_t round_keys[3][16]; |
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| 29 | int triple_des; |
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| 30 | }; |
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| 31 | |||
| 32 | /** |
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| 33 | * @brief Initializes an AVDES context. |
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| 34 | * |
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| 35 | * @param key_bits must be 64 or 192 |
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| 36 | * @param decrypt 0 for encryption/CBC-MAC, 1 for decryption |
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| 37 | */ |
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| 38 | int av_des_init(struct AVDES *d, const uint8_t *key, int key_bits, int decrypt); |
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| 39 | |||
| 40 | /** |
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| 41 | * @brief Encrypts / decrypts using the DES algorithm. |
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| 42 | * |
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| 43 | * @param count number of 8 byte blocks |
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| 44 | * @param dst destination array, can be equal to src, must be 8-byte aligned |
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| 45 | * @param src source array, can be equal to dst, must be 8-byte aligned, may be NULL |
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| 46 | * @param iv initialization vector for CBC mode, if NULL then ECB will be used, |
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| 47 | * must be 8-byte aligned |
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| 48 | * @param decrypt 0 for encryption, 1 for decryption |
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| 49 | */ |
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| 50 | void av_des_crypt(struct AVDES *d, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt); |
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| 51 | |||
| 52 | /** |
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| 53 | * @brief Calculates CBC-MAC using the DES algorithm. |
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| 54 | * |
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| 55 | * @param count number of 8 byte blocks |
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| 56 | * @param dst destination array, can be equal to src, must be 8-byte aligned |
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| 57 | * @param src source array, can be equal to dst, must be 8-byte aligned, may be NULL |
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| 58 | */ |
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| 59 | void av_des_mac(struct AVDES *d, uint8_t *dst, const uint8_t *src, int count); |
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| 60 | |||
| 61 | #endif /* AVUTIL_DES_H */ |