Diff: md5.h

Revision:

0:08a4d61cd84c

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/md5.h	Tue Sep 20 12:46:26 2011 +0000
@@ -0,0 +1,118 @@
+/* MD5
+ converted to C++ class by Frank Thilo (thilo@unix-ag.org)
+ for bzflag (http://www.bzflag.org)
+
+   based on:
+
+   md5.h and md5.c
+   reference implementation of RFC 1321
+
+   Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
+rights reserved.
+
+License to copy and use this software is granted provided that it
+is identified as the "RSA Data Security, Inc. MD5 Message-Digest
+Algorithm" in all material mentioning or referencing this software
+or this function.
+
+License is also granted to make and use derivative works provided
+that such works are identified as "derived from the RSA Data
+Security, Inc. MD5 Message-Digest Algorithm" in all material
+mentioning or referencing the derived work.
+
+RSA Data Security, Inc. makes no representations concerning either
+the merchantability of this software or the suitability of this
+software for any particular purpose. It is provided "as is"
+without express or implied warranty of any kind.
+
+These notices must be retained in any copies of any part of this
+documentation and/or software.
+
+*/
+
+#ifndef BZF_MD5_H
+#define BZF_MD5_H
+
+#include <string>
+
+
+/** a small class for calculating MD5 hashes of strings or byte arrays
+ it is not meant to be fast or secure
+
+ usage: 1) feed it blocks of uchars with update()
+      2) finalize()
+      3) get hexdigest() string
+      or
+      MD5(std::string).hexdigest()
+
+ assumes that char is 8 bit and int is 32 bit
+*/
+class MD5
+{
+public:
+  typedef unsigned int size_type; // must be 32bit
+
+  MD5();
+  /**
+    take string, hash it and finalize
+    @param text the string to hash
+  */
+  MD5(const std::string& text);
+  /**
+    add text to hash
+    @param buf the text to add to the hash
+    @param text length
+  */
+  void update(const unsigned char *buf, size_type length);
+  /**
+    add text to hash
+    @param buf the text to add to the hash
+    @param text length
+  */
+  void update(const char *buf, size_type length);
+  /**
+    calculate the final hash value
+  */
+  MD5& finalize();
+  /**
+    @return the hash as hex string
+  */
+  std::string hexdigest() const;
+  
+  void init();
+  
+  /**
+    @return the hash as binary data, an array of 16 bytes.
+  */
+  const unsigned char* rawdigest() const { return digest; }
+
+private:
+  typedef unsigned char uint1; //  8bit
+  typedef unsigned int uint4;  // 32bit
+  enum {blocksize = 64}; // VC6 won't eat a const static int here
+
+  void transform(const uint1 block[blocksize]);
+  static void decode(uint4 output[], const uint1 input[], size_type len);
+  static void encode(uint1 output[], const uint4 input[], size_type len);
+
+  bool finalized;
+  uint1 buffer[blocksize]; // bytes that didn't fit in last 64 byte chunk
+  uint4 count[2];   // 64bit counter for number of bits (lo, hi)
+  uint4 state[4];   // digest so far
+  uint1 digest[16]; // the result
+
+  // low level logic operations
+  static inline uint4 F(uint4 x, uint4 y, uint4 z);
+  static inline uint4 G(uint4 x, uint4 y, uint4 z);
+  static inline uint4 H(uint4 x, uint4 y, uint4 z);
+  static inline uint4 I(uint4 x, uint4 y, uint4 z);
+  static inline uint4 rotate_left(uint4 x, int n);
+  static inline void FF(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac);
+  static inline void GG(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac);
+  static inline void HH(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac);
+  static inline void II(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac);
+};
+
+std::string md5(const std::string str);
+
+#endif
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