1 files changed, 61 insertions, 0 deletions
diff --git a/md5.h b/md5.h
new file mode 100644
index 0000000..9f3b598
--- /dev/null
+++ b/md5.h
@@ -0,0 +1,61 @@
+/* Functions to compute MD5 message digest of memory blocks according to the
+   definition of MD5 in RFC 1321 from April 1992.
+   Copyright (C) 2020-2024 Antonio Diaz Diaz.
+
+   This library is free software. Redistribution and use in source and
+   binary forms, with or without modification, are permitted provided
+   that the following conditions are met:
+
+   1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions, and the following disclaimer.
+
+   2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions, and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+
+   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.
+*/
+
+struct md5_type
+  {
+  uint8_t data[16];		// 128-bit md5 digest
+
+  bool operator==( const md5_type & d ) const
+    { return ( std::memcmp( data, d.data, 16 ) == 0 ); }
+  bool operator!=( const md5_type & d ) const { return !( *this == d ); }
+//  const uint8_t & operator[]( const int i ) const { return data[i]; }
+  uint8_t & operator[]( const int i ) { return data[i]; }
+  };
+
+
+class MD5SUM
+  {
+  uint64_t count;		// data length in bytes, modulo 2^64
+  uint32_t state[4];		// state (ABCD)
+  uint8_t ibuf[64];		// input buffer with space for a block
+
+  void md5_process_block( const uint8_t block[64] );
+
+public:
+  MD5SUM() { reset(); }
+
+  void reset()
+    {
+    count = 0;
+    state[0] = 0x67452301;	// magic initialization constants
+    state[1] = 0xEFCDAB89;
+    state[2] = 0x98BADCFE;
+    state[3] = 0x10325476;
+    }
+
+  void md5_update( const uint8_t * const buffer, const unsigned long len );
+  void md5_finish( md5_type & digest );
+  };
+
+void compute_md5( const uint8_t * const buffer, const unsigned long len,
+                  md5_type & digest );
+
+bool check_md5( const uint8_t * const buffer, const unsigned long len,
+                const md5_type & digest );