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1 /*
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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
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22 #ifndef AVUTIL_DES_H
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23 #define AVUTIL_DES_H
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24
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25 #include <stdint.h>
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26
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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
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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
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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
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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
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61 #endif /* AVUTIL_DES_H */
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