/* * DES encryption/decryption * Copyright (c) 2007 Reimar Doeffinger * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef AVUTIL_DES_H #define AVUTIL_DES_H #include <stdint.h> struct AVDES { uint64_t round_keys[3][16]; int triple_des; }; /** * @brief Initializes an AVDES context. * * @param key_bits must be 64 or 192 * @param decrypt 0 for encryption/CBC-MAC, 1 for decryption */ int av_des_init(struct AVDES *d, const uint8_t *key, int key_bits, int decrypt); /** * @brief Encrypts / decrypts using the DES algorithm. * * @param count number of 8 byte blocks * @param dst destination array, can be equal to src, must be 8-byte aligned * @param src source array, can be equal to dst, must be 8-byte aligned, may be NULL * @param iv initialization vector for CBC mode, if NULL then ECB will be used, * must be 8-byte aligned * @param decrypt 0 for encryption, 1 for decryption */ void av_des_crypt(struct AVDES *d, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt); /** * @brief Calculates CBC-MAC using the DES algorithm. * * @param count number of 8 byte blocks * @param dst destination array, can be equal to src, must be 8-byte aligned * @param src source array, can be equal to dst, must be 8-byte aligned, may be NULL */ void av_des_mac(struct AVDES *d, uint8_t *dst, const uint8_t *src, int count); #endif /* AVUTIL_DES_H */