libavutil: Add CAST128 symmetric block cipher

Only ECB mode is supported at the moment
Signed-off-by: Supraja Meedinti <supraja0493@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Changelog

@@ -5,6 +5,7 @@ version <next>:
 - HEVC/H.265 RTP payload format (draft v6) packetizer
 - SUP/PGS subtitle demuxer
 - ffprobe -show_pixel_formats option
+- CAST128 symmetric block cipher, ECB mode
 
 version 2.4:
 - Icecast protocol

libavutil/Makefile

@@ -15,6 +15,7 @@ HEADERS = adler32.h                                                     \
           bprint.h                                                      \
           bswap.h                                                       \
           buffer.h                                                      \
+          cast5.h                                                       \
           channel_layout.h                                              \
           common.h                                                      \
           cpu.h                                                         \
@@ -82,6 +83,7 @@ OBJS = adler32.o                                                        \
        blowfish.o                                                       \
        bprint.o                                                         \
        buffer.o                                                         \
+       cast5.o                                                          \
        channel_layout.o                                                 \
        cpu.o                                                            \
        crc.o                                                            \
@@ -151,6 +153,7 @@ TESTPROGS = adler32                                                     \
             base64                                                      \
             blowfish                                                    \
             bprint                                                      \
+            cast5                                                       \
             cpu                                                         \
             crc                                                         \
             des                                                         \

libavutil/cast5.h

+/*
+ * 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 */

tests/fate/libavutil.mak

@@ -8,6 +8,11 @@ fate-aes: libavutil/aes-test$(EXESUF)
 fate-aes: CMD = run libavutil/aes-test
 fate-aes: REF = /dev/null
 
+FATE_LIBAVUTIL += fate-cast5
+fate-cast5: libavutil/cast5-test$(EXESUF)
+fate-cast5: CMD = run libavutil/cast5-test
+fate-cast5: REF = /dev/null
+
 FATE_LIBAVUTIL += fate-atomic
 fate-atomic: libavutil/atomic-test$(EXESUF)
 fate-atomic: CMD = run libavutil/atomic-test