/*
* RC4 encryption/decryption/pseudo-random number generator
*
- * 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
*/
#include <stdint.h>
-void ff_rc4_enc(const uint8_t *key, int keylen, uint8_t *data, int datalen);
+struct AVRC4 {
+ uint8_t state[256];
+ int x, y;
+};
+
+/**
+ * @brief Initializes an AVRC4 context.
+ *
+ * @param key_bits must be a multiple of 8
+ * @param decrypt 0 for encryption, 1 for decryption, currently has no effect
+ */
+int av_rc4_init(struct AVRC4 *d, const uint8_t *key, int key_bits, int decrypt);
+
+/**
+ * @brief Encrypts / decrypts using the RC4 algorithm.
+ *
+ * @param count number of bytes
+ * @param dst destination array, can be equal to src
+ * @param src source array, can be equal to dst, may be NULL
+ * @param iv not (yet) used for RC4, should be NULL
+ * @param decrypt 0 for encryption, 1 for decryption, not (yet) used
+ */
+void av_rc4_crypt(struct AVRC4 *d, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt);
#endif /* AVUTIL_RC4_H */