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leggett  committed 4323844

added MD5.h, MD5.cxx

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  • Parent commits 0a3831f
  • Tags CxxUtils-00-00-51

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+2010-02-12  Charles Leggett
+	* added MD5.h, MD5.cxx: RSA MD5 digest generator
+	* tag CxxUtils-00-00-50
+	
 2010-01-30  David Quarrie <David.Quarrie@cern.ch>
 
 	* Tagging CxxUtils-00-00-49.

File CxxUtils/MD5.h

+
+#ifndef CXXUTILS_MD5_H
+#define CXXUTILS_MD5_H 1
+
+// MD5.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:
+
+   MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
+   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.
+
+*/
+#include <string>
+
+// Constants for MD5Transform routine.
+// Although we could use C++ style constants, defines are actually better,
+// since they let us easily evade scope clashes.
+#define S11 7
+#define S12 12
+#define S13 17
+#define S14 22
+#define S21 5
+#define S22 9
+#define S23 14
+#define S24 20
+#define S31 4
+#define S32 11
+#define S33 16
+#define S34 23
+#define S41 6
+#define S42 10
+#define S43 15
+#define S44 21
+
+class MD5 {
+  public:
+    MD5              (unsigned char* buffer, unsigned long len);
+    MD5              ();  
+    void  update     (unsigned char *input, unsigned int input_length);
+    // Finalize MD5 check-sum
+    void  finalize   ();
+
+
+    void raw_digest (unsigned char *buff);
+
+    std::string       hex_digest ();
+
+  private:
+    // next, the private data:
+    unsigned int state[4];
+    unsigned int count[2];     // number of *bits*, mod 2^64
+    unsigned char buffer[64];   // input buffer
+    unsigned char digest[16];
+    unsigned char finalized;
+
+    // last, the private methods, mostly static:
+    void init             ();               // called by all constructors
+    void transform        (unsigned char *buffer);  // does the real update work.  Note 
+                                            // that length is implied to be 64.
+
+    static void encode    (unsigned char *dest, unsigned int *src, unsigned int length);
+    static void decode    (unsigned int *dest, unsigned char *src, unsigned int length);
+
+    // ROTATE_LEFT rotates x left n bits.
+    static inline unsigned int  rotate_left (unsigned int x, unsigned int n)
+    {  return (x << n) | (x >> (32-n));                             }
+    // F, G, H and I are basic MD5 functions.
+    static inline unsigned int  F(unsigned int x, unsigned int y, unsigned int z)
+    {  return (x & y) | (~x & z);                                   }
+    static inline unsigned int  G(unsigned int x, unsigned int y, unsigned int z)
+    {  return (x & z) | (y & ~z);                                   }
+    static inline unsigned int  H(unsigned int x, unsigned int y, unsigned int z)
+    {  return x ^ y ^ z;                                            }
+    static inline unsigned int  I(unsigned int x, unsigned int y, unsigned int z)
+    {  return y ^ (x | ~z);                                         }
+
+    // FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
+    // Rotation is separate from addition to prevent recomputation.
+    static inline void   FF  (unsigned int& a, unsigned int b, unsigned int c, unsigned int d, unsigned int x, unsigned int s, unsigned int ac)
+    {
+     a += F(b, c, d) + x + ac;
+     a = rotate_left(a, s) + b;
+    }
+    static inline void   GG  (unsigned int& a, unsigned int b, unsigned int c, unsigned int d, unsigned int x, unsigned int s, unsigned int ac)
+    {
+     a += G(b, c, d) + x + ac;
+     a = rotate_left(a, s) + b;
+    }
+    static inline void   HH  (unsigned int& a, unsigned int b, unsigned int c, unsigned int d, unsigned int x, unsigned int s, unsigned int ac)
+    {
+     a += H(b, c, d) + x + ac;
+     a = rotate_left(a, s) + b;
+    }
+    static inline void   II  (unsigned int& a, unsigned int b, unsigned int c, unsigned int d, unsigned int x, unsigned int s, unsigned int ac)
+    {
+     a += I(b, c, d) + x + ac;
+     a = rotate_left(a, s) + b;
+    }
+};
+
+struct MD5_digest {
+  unsigned long long val[2];
+  
+  MD5_digest() {};    
+  MD5_digest( const std::string& msg ) {
+    MD5 checkSum( (unsigned char*)(msg.c_str()), msg.length());
+    checkSum.raw_digest( (unsigned char*) &val );
+  }
+  
+  bool operator< (const MD5_digest& rhs) const {
+    if (val[0] == rhs.val[0]) {
+      return (val[1] < rhs.val[1]);
+    } else {
+      return (val[0] < rhs.val[0]);
+    }
+  }
+};
+
+#endif
+
+#include "CxxUtils/MD5.h"
+
+#include <cassert>
+#include <string>
+#include <cstdio>
+#include <iostream>
+#include <string.h>
+
+// MD5 simple initialization method
+MD5::MD5()    {
+  init();
+}
+
+// MD5 simple initialization method
+MD5::MD5(unsigned char* buffer, unsigned long len)    {
+  init();
+  update(buffer, len);
+  finalize();
+}
+
+// MD5 block update operation. Continues an MD5 message-digest
+// operation, processing another message block, and updating the
+// context.
+void MD5::update (unsigned char *input, unsigned int input_length) {
+  unsigned int idx, index, space;
+  if ( finalized ) {  // so we can't update!
+    std::cerr << "MD5::update:  Can't update a finalized digest!" << std::endl;
+    return;
+  }
+  // Compute number of bytes mod 64
+  index = (unsigned int)((count[0] >> 3) & 0x3F);
+  // Update number of bits
+  if (  (count[0] += ((unsigned int) input_length << 3))<((unsigned int) input_length << 3) )
+    count[1]++;
+
+  count[1] += ((unsigned int)input_length >> 29);
+  space = 64 - index;  // how much space is left in buffer
+  // Transform as many times as possible.
+  if (input_length >= space) { // ie. we have enough to fill the buffer
+    // fill the rest of the buffer and transform
+    memcpy (buffer + index, input, space);
+    transform (buffer);
+    // now, transform each 64-byte piece of the input, bypassing the buffer
+    for (idx = space; idx + 63 < input_length; idx += 64)
+      transform (input+idx);
+
+    index = 0;  // so we can buffer remaining
+  }
+  else  {
+    idx = 0;    // so we can buffer the whole input
+  }
+
+  // and here we do the buffering:
+  memcpy(buffer+index, input+idx, input_length-idx);
+}
+
+// MD5 finalization. Ends an MD5 message-digest operation, writing the
+// the message digest and zeroizing the context.
+void MD5::finalize ()     {
+  unsigned char bits[8];
+  unsigned int index, padLen;
+  static unsigned char PADDING[64]={
+    0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
+    };
+  if (finalized){
+    std::cerr << "MD5::finalize:  Already finalized this digest!" << std::endl;
+    return;
+  }
+  // Save number of bits
+  encode (bits, count, 8);
+  // Pad out to 56 mod 64.
+  index = (unsigned int) ((count[0] >> 3) & 0x3f);
+  padLen = (index < 56) ? (56 - index) : (120 - index);
+  update (PADDING, padLen);
+  // Append length (before padding)
+  update (bits, 8);
+  // Store state in digest
+  encode (digest, state, 16);
+  // Zeroize sensitive information
+  memset (buffer, 0, sizeof(*buffer));
+  finalized=1;
+}
+
+void MD5::raw_digest(unsigned char *s){
+  if (finalized){
+    memcpy(s, digest, 16);
+    return;
+  }
+  std::cerr << "MD5::raw_digest:  Can't get digest if you haven't "<<
+    "finalized the digest!" << std::endl;
+}
+
+std::string MD5::hex_digest()   {
+  char s[33];
+  if (!finalized){
+    std::cerr << "MD5::hex_digest:  Can't get digest if you haven't "<<
+      "finalized the digest!" <<std::endl;
+    return "";
+  }
+  for (int i=0; i<16; i++)
+    sprintf(s+i*2, "%02x", digest[i]);
+  s[32]='\0';
+  return s;
+}
+
+// PRIVATE METHODS:
+void MD5::init(){
+  finalized=0;  // we just started!
+  // Nothing counted, so count=0
+  count[0] = 0;
+  count[1] = 0;
+  // Load magic initialization constants.
+  state[0] = 0x67452301;
+  state[1] = 0xefcdab89;
+  state[2] = 0x98badcfe;
+  state[3] = 0x10325476;
+}
+
+// MD5 basic transformation. Transforms state based on block.
+void MD5::transform (unsigned char* block){
+  unsigned int a = state[0], b = state[1], c = state[2], d = state[3], x[16];
+  decode (x, block, 64);
+  assert(!finalized);  // not just a user error, since the method is private
+  /* Round 1                                     */
+  FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1  */
+  FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2  */
+  FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3  */
+  FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4  */
+  FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5  */
+  FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6  */
+  FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7  */
+  FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8  */
+  FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9  */
+  FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
+  FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
+  FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
+  FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
+  FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
+  FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
+  FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
+  /* Round 2                                     */
+  GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
+  GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
+  GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
+  GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
+  GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
+  GG (d, a, b, c, x[10], S22,  0x2441453); /* 22 */
+  GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
+  GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
+  GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
+  GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
+  GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
+  GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
+  GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
+  GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
+  GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
+  GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
+  /* Round 3                                     */
+  HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
+  HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
+  HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
+  HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
+  HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
+  HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
+  HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
+  HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
+  HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
+  HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
+  HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
+  HH (b, c, d, a, x[ 6], S34,  0x4881d05); /* 44 */
+  HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
+  HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
+  HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
+  HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
+  /* Round 4                                     */
+  II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
+  II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
+  II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
+  II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
+  II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
+  II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
+  II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
+  II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
+  II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
+  II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
+  II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
+  II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
+  II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
+  II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
+  II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
+  II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
+  state[0] += a;
+  state[1] += b;
+  state[2] += c;
+  state[3] += d;
+  // Zeroize sensitive information.
+  memset ( (unsigned char *) x, 0, sizeof(x));
+}
+
+// Encodes input (unsigned int) into output (unsigned char). Assumes len is
+// a multiple of 4.
+void MD5::encode (unsigned char *output, unsigned int *input, unsigned int len) {
+  for (unsigned int i = 0, j = 0; j < len; i++, j += 4) {
+    output[j]   = (unsigned char)  (input[i] & 0xff);
+    output[j+1] = (unsigned char) ((input[i] >> 8) & 0xff);
+    output[j+2] = (unsigned char) ((input[i] >> 16) & 0xff);
+    output[j+3] = (unsigned char) ((input[i] >> 24) & 0xff);
+  }
+}
+
+// Decodes input (unsigned char) into output (unsigned int). Assumes len is
+// a multiple of 4.
+void MD5::decode (unsigned int *output, unsigned char *input, unsigned int len){
+  for (unsigned int i = 0, j = 0; j < len; i++, j += 4)
+    output[i] = ((unsigned int)input[j]) | (((unsigned int)input[j+1]) << 8) |
+      (((unsigned int)input[j+2]) << 16) | (((unsigned int)input[j+3]) << 24);
+}