* DES encryption/decryption
* Copyright (c) 2007 Reimar Doeffinger
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
-#ifndef FFMPEG_DES_H
-#define FFMPEG_DES_H
+#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, 1 for decryption
+ */
+int av_des_init(struct AVDES *d, const uint8_t *key, int key_bits, int decrypt);
+
/**
- * \brief en- or decrypt an 64-bit block of data with DES
- * \param in data to process.
- * \param key key to use for en-/decryption.
- * \param decrypt if 0 encrypt, else decrypt.
- * \return processed data
+ * @brief Encrypts / decrypts using the DES algorithm.
*
- * If your input data is in 8-bit blocks treat it as big-endian
- * (use e.g. AV_RB64 and AV_WB64).
+ * @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
*/
-uint64_t ff_des_encdec(uint64_t in, uint64_t key, int decrypt) av_const;
+void av_des_crypt(struct AVDES *d, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt);
-#endif /* FFMPEG_DES_H */
+#endif /* AVUTIL_DES_H */