Mercurial > hg > forks > libbpg
diff libavutil/cast5.h @ 0:772086c29cc7
Initial import.
author | Matti Hamalainen <ccr@tnsp.org> |
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date | Wed, 16 Nov 2016 11:16:33 +0200 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/libavutil/cast5.h Wed Nov 16 11:16:33 2016 +0200 @@ -0,0 +1,67 @@ +/* + * An implementation of the CAST128 algorithm as mentioned in RFC2144 + * Copyright (c) 2014 Supraja Meedinti + * + * 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_CAST5_H +#define AVUTIL_CAST5_H + +#include <stdint.h> + + +/** + * @file + * @brief Public header for libavutil CAST5 algorithm + * @defgroup lavu_cast5 CAST5 + * @ingroup lavu_crypto + * @{ + */ + +extern const int av_cast5_size; + +struct AVCAST5; + +/** + * Allocate an AVCAST5 context + * To free the struct: av_free(ptr) + */ +struct AVCAST5 *av_cast5_alloc(void); +/** + * Initialize an AVCAST5 context. + * + * @param ctx an AVCAST5 context + * @param key a key of 5,6,...16 bytes used for encryption/decryption + * @param key_bits number of keybits: possible are 40,48,...,128 + */ +int av_cast5_init(struct AVCAST5 *ctx, const uint8_t *key, int key_bits); + +/** + * Encrypt or decrypt a buffer using a previously initialized context + * + * @param ctx an AVCAST5 context + * @param dst destination array, can be equal to src + * @param src source array, can be equal to dst + * @param count number of 8 byte blocks + * @param decrypt 0 for encryption, 1 for decryption + */ +void av_cast5_crypt(struct AVCAST5 *ctx, uint8_t *dst, const uint8_t *src, int count,int decrypt); +/** + * @} + */ +#endif /* AVUTIL_CAST5_H */