Imported existing code

indra/llcommon/llmd5.h

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+/** 
+ * @file llmd5.h
+ *
+ * $LicenseInfo:firstyear=2001&license=viewergpl$
+ * 
+ * Copyright (c) 2001-2009, Linden Research, Inc.
+ * 
+ * Second Life Viewer Source Code
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
+ * 
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at
+ * http://secondlifegrid.net/programs/open_source/licensing/flossexception
+ * 
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ * 
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ * $/LicenseInfo$
+ */
+
+#ifndef LL_LLMD5_H
+#define LL_LLMD5_H
+
+// LLMD5.CC - source code for the C++/object oriented translation and 
+//          modification of MD5.
+
+// Translation and modification (c) 1995 by Mordechai T. Abzug 
+
+// This translation/ modification is provided "as is," without express or 
+// implied warranty of any kind.
+
+// The translator/ modifier does not claim (1) that MD5 will do what you think 
+// it does; (2) that this translation/ modification is accurate; or (3) that 
+// this software is "merchantible."  (Language for this disclaimer partially 
+// copied from the disclaimer below).
+
+/* based on:
+
+   MD5.H - header file for MD5C.C
+   MDDRIVER.C - test driver for MD2, MD4 and MD5
+
+   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.
+
+*/
+
+// use for the raw digest output
+const int MD5RAW_BYTES = 16;
+
+// use for outputting hex digests
+const int MD5HEX_STR_SIZE = 33;  // char hex[MD5HEX_STR_SIZE]; with null
+const int MD5HEX_STR_BYTES = 32; // message system fixed size
+
+class LLMD5 {
+// first, some types:
+  typedef unsigned       int uint4; // assumes integer is 4 words long
+  typedef unsigned short int uint2; // assumes short integer is 2 words long
+  typedef unsigned      char uint1; // assumes char is 1 word long
+
+// how many bytes to grab at a time when checking files
+  static const int BLOCK_LEN;
+
+public:
+// methods for controlled operation:
+  LLMD5              ();  // simple initializer
+  void  update     (const uint1 *input, const uint4 input_length);
+  void  update     (std::istream& stream);
+  void  update     (FILE *file);
+  void  finalize   ();
+
+// constructors for special circumstances.  All these constructors finalize
+// the MD5 context.
+  LLMD5              (const unsigned char *string); // digest string, finalize
+  LLMD5              (std::istream& stream);       // digest stream, finalize
+  LLMD5              (FILE *file);            // digest file, close, finalize
+  LLMD5              (const unsigned char *string, const unsigned int number);
+  
+// methods to acquire finalized result
+  void				raw_digest(unsigned char *array);	// provide 16-byte array for binary data
+  void				hex_digest(char *string);			// provide 33-byte array for ascii-hex string
+  friend std::ostream&   operator<< (std::ostream&, LLMD5 context);
+
+
+
+private:
+
+
+// next, the private data:
+  uint4 state[4];
+  uint4 count[2];     // number of *bits*, mod 2^64
+  uint1 buffer[64];   // input buffer
+  uint1 digest[16];
+  uint1 finalized;
+
+// last, the private methods, mostly static:
+  void init             ();               // called by all constructors
+  void transform        (const uint1 *buffer);  // does the real update work.  Note 
+                                          // that length is implied to be 64.
+
+  static void encode    (uint1 *dest, const uint4 *src, const uint4 length);
+  static void decode    (uint4 *dest, const uint1 *src, const uint4 length);
+
+};
+
+#endif // LL_LLMD5_H