From bedd6906eabdd513042d6a178d4dc56a3a41d1d3 Mon Sep 17 00:00:00 2001 From: Fox Caminiti Date: Fri, 16 Dec 2022 20:16:43 -0500 Subject: v3, file/build organization --- dependencies/include/libavutil/rc4.h | 69 ++++++++++++++++++++++++++++++++++++ 1 file changed, 69 insertions(+) create mode 100644 dependencies/include/libavutil/rc4.h (limited to 'dependencies/include/libavutil/rc4.h') diff --git a/dependencies/include/libavutil/rc4.h b/dependencies/include/libavutil/rc4.h new file mode 100644 index 0000000..bf0ca6e --- /dev/null +++ b/dependencies/include/libavutil/rc4.h @@ -0,0 +1,69 @@ +/* + * RC4 encryption/decryption/pseudo-random number generator + * + * 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_RC4_H +#define AVUTIL_RC4_H + +#include + +/** + * @defgroup lavu_rc4 RC4 + * @ingroup lavu_crypto + * @{ + */ + +typedef struct AVRC4 { + uint8_t state[256]; + int x, y; +} AVRC4; + +/** + * Allocate an AVRC4 context. + */ +AVRC4 *av_rc4_alloc(void); + +/** + * @brief Initializes an AVRC4 context. + * + * @param d pointer to the AVRC4 context + * @param key buffer containig the key + * @param key_bits must be a multiple of 8 + * @param decrypt 0 for encryption, 1 for decryption, currently has no effect + * @return zero on success, negative value otherwise + */ +int av_rc4_init(struct AVRC4 *d, const uint8_t *key, int key_bits, int decrypt); + +/** + * @brief Encrypts / decrypts using the RC4 algorithm. + * + * @param d pointer to the AVRC4 context + * @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 */ -- cgit v1.2.3