libavutil: Added Camellia symmetric block cipher

Signed-off-by: Supraja Meedinti <supraja0493@gmail.com>
Previous version of this patch reviewed-by: Giorgio Vazzana <mywing81@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 70 insertions, 0 deletions

diff --git a/libavutil/camellia.h b/libavutil/camellia.h
new file mode 100644
index 0000000000..fc3b570847
--- /dev/null
+++ b/libavutil/camellia.h
@@ -0,0 +1,70 @@
+/*
+ * An implementation of the CAMELLIA algorithm as mentioned in RFC3713
+ * 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_CAMELLIA_H
+#define AVUTIL_CAMELLIA_H
+
+#include <stdint.h>
+
+
+/**
+  * @file
+  * @brief Public header for libavutil CAMELLIA algorithm
+  * @defgroup lavu_camellia CAMELLIA
+  * @ingroup lavu_crypto
+  * @{
+  */
+
+extern const int av_camellia_size;
+
+struct AVCAMELLIA;
+
+/**
+  * Allocate an AVCAMELLIA context
+  * To free the struct: av_free(ptr)
+  */
+struct AVCAMELLIA *av_camellia_alloc(void);
+
+/**
+  * Initialize an AVCAMELLIA context.
+  *
+  * @param ctx an AVCAMELLIA context
+  * @param key a key of 16, 24, 32 bytes used for encryption/decryption
+  * @param key_bits number of keybits: possible are 128, 192, 256
+ */
+int av_camellia_init(struct AVCAMELLIA *ctx, const uint8_t *key, int key_bits);
+
+/**
+  * Encrypt or decrypt a buffer using a previously initialized context
+  *
+  * @param ctx an AVCAMELLIA 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
+  * @paran iv initialization vector for CBC mode, NULL for ECB mode
+  * @param decrypt 0 for encryption, 1 for decryption
+ */
+void av_camellia_crypt(struct AVCAMELLIA *ctx, uint8_t *dst, const uint8_t *src, int count, uint8_t* iv, int decrypt);
+
+/**
+ * @}
+ */
+#endif /* AVUTIL_CAMELLIA_H */