author | koda |
Sat, 09 Mar 2013 01:17:31 +0100 | |
changeset 8703 | a1e6dc8a267d |
parent 7813 | 7ac83d79b897 |
permissions | -rw-r--r-- |
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/* |
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* Blowfish algorithm |
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* |
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* This file is part of Libav. |
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* |
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* Libav 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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* Libav 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 Libav; 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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#ifndef AVUTIL_BLOWFISH_H |
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#define AVUTIL_BLOWFISH_H |
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#include <stdint.h> |
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/** |
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* @defgroup lavu_blowfish Blowfish |
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* @ingroup lavu_crypto |
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* @{ |
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*/ |
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#define AV_BF_ROUNDS 16 |
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typedef struct AVBlowfish { |
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uint32_t p[AV_BF_ROUNDS + 2]; |
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uint32_t s[4][256]; |
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} AVBlowfish; |
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/** |
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* Initialize an AVBlowfish context. |
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* |
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* @param ctx an AVBlowfish context |
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* @param key a key |
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* @param key_len length of the key |
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*/ |
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void av_blowfish_init(struct AVBlowfish *ctx, const uint8_t *key, int key_len); |
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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 AVBlowfish context |
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* @param xl left four bytes halves of input to be encrypted |
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* @param xr right four bytes halves of input to be encrypted |
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* @param decrypt 0 for encryption, 1 for decryption |
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*/ |
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void av_blowfish_crypt_ecb(struct AVBlowfish *ctx, uint32_t *xl, uint32_t *xr, |
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int decrypt); |
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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 AVBlowfish 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 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_blowfish_crypt(struct AVBlowfish *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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#endif /* AVUTIL_BLOWFISH_H */ |