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2134
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1 /*
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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
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22 #ifndef AVUTIL_BLOWFISH_H
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23 #define AVUTIL_BLOWFISH_H
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24
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25 #include <stdint.h>
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26
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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
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33 #define AV_BF_ROUNDS 16
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34
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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
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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
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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
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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
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73 /**
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74 * @}
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75 */
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76
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77 #endif /* AVUTIL_BLOWFISH_H */
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