lib: Add implementation for MD5 hashes

2 files changed, 75 insertions, 2 deletions

diff --git a/include/ouroboros/hash.h b/include/ouroboros/hash.h
index 4779a9a6..a94b37ee 100644
--- a/include/ouroboros/hash.h
+++ b/include/ouroboros/hash.h
@@ -24,11 +24,12 @@
 #ifndef OUROBOROS_LIB_HASH_H
 #define OUROBOROS_LIB_HASH_H
 
-#include <ouroboros/sha3.h>
 #include <ouroboros/crc32.h>
+#include <ouroboros/md5.h>
+#include <ouroboros/sha3.h>
 
 #define HASH_FMT "%02x%02x%02x%02x"
-#define HASH_VAL(hash)                                \
+#define HASH_VAL(hash)                                 \
         ((*(unsigned int *) hash) & 0xFF000000) >> 24, \
         ((*(unsigned int *) hash) & 0x00FF0000) >> 16, \
         ((*(unsigned int *) hash) & 0x0000FF00) >> 8,  \
diff --git a/include/ouroboros/md5.h b/include/ouroboros/md5.h
new file mode 100644
index 00000000..a628e6cb
--- /dev/null
+++ b/include/ouroboros/md5.h
@@ -0,0 +1,72 @@
+/*
+ * Ouroboros - Copyright (C) 2016 - 2017
+ *
+ * MD5 algorithm
+ *
+ *    Dimitri Staessens <[email protected]>
+ *    Sander Vrijders   <[email protected]>
+ *
+ * This implementation is adapted and redistributed from the RHASH
+ * project implementation of the MD5 algorithm
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * version 2.1 as published by the Free Software Foundation.
+ *
+ * This library 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ *    -- original license
+ *
+ * md5.c - an implementation of the MD5 algorithm, based on RFC 1321.
+ *
+ * Copyright: 2007-2012 Aleksey Kravchenko <[email protected]>
+ *
+ * Permission is hereby granted,  free of charge,  to any person  obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction,  including without limitation
+ * the rights to  use, copy, modify,  merge, publish, distribute, sublicense,
+ * and/or sell copies  of  the Software,  and to permit  persons  to whom the
+ * Software is furnished to do so.
+ *
+ * This program  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.  Use this program  at  your own risk!
+ */
+
+#ifndef OUROBOROS_LIB_MD5_H
+#define OUROBOROS_LIB_MD5_H
+
+#include "unistd.h"
+#include <stdint.h>
+
+#define MD5_BLOCK_SIZE 64
+#define MD5_HASH_LEN   16
+
+struct md5_ctx
+{
+        /* 512-bit buffer for leftovers */
+        uint32_t message[MD5_BLOCK_SIZE / 4];
+        /* number of processed bytes */
+        uint64_t length;
+        /* 128-bit algorithm internal hashing state */
+        uint32_t hash[4];
+};
+
+void rhash_md5_init(struct md5_ctx *ctx);
+
+void rhash_md5_update(struct md5_ctx * ctx,
+                      const void *     msg,
+                      size_t           size);
+
+void rhash_md5_final(struct md5_ctx * ctx,
+                     uint8_t *        result);
+
+#endif /* OUROBOROS_LIB_MD5_H */