C-Builder und MD5

[Zero01]

String __fastcall TForm1::MakeMD5(String s)
{
     MD5->Reset();
     MD5->AutoCompleteInput = true;
     s = MD5->CodeString(s);
     s = LowerCase(s.SubString(3,s.Length() - 2));
     return s;
}

Es kommt zwar bei gleichen Strings immer das gleiche Zeichenwirrwar herraus aber ne MD5 hash hab ich irgendwie anders in erinnerung Mach ich irgendetwas falsch ?

[Reyx]

Da nicht jeder weiß, wie du einen MD5 in Errinerung hast, bzw. wie deiner aussieht, währe es vielleicht hilfreich, wenn du das durch deinen Quellcode erhaltenen Ergebnis posten würdest ...

@weber
In meiner Version von Indy (9) gibt es die von dir benannte Komponente nicht.

[Zero01]

Der String "beta" wird mit dem oben genannten code so ausgegeben: m7¸m]ìåpª»Ðºw?c

[weber]

In meiner Version von Indy (9) gibt es die von dir benannte Komponente nicht.

Kann ich was für deine veraltete Indy Version ?

[Jansen]

TIdCoderMD5 war Bestandteil der veralteten Indy-Version 8, die zum Lieferumfang des BCB6 gehört.
In der aktuellsten im BCB verwendbaren Version 9 gibt es diese Komponente nicht mehr.

[Reyx]

weber schrieb:

In meiner Version von Indy (9) gibt es die von dir benannte Komponente nicht.

Kann ich was für deine veraltete Indy Version ?

Nein, aber du hast selbstverständlich das Kunststück vollbracht, Version 10 beim BCB zum Laufen zu kriegen ...

[Acidmrp]

auf jeden Fall liefert die MD5 Routine von Indy nicht die selben Werte wie man
sie von MD5 erwartet (zwar immer die selben aber eben nicht die originalen MD5 Werte).

Daher:

MD5.h

// 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:

   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.

*/

#include <stdio.h>
#include <fstream.h>
#include <iostream.h>

class MD5 {

public:
// methods for controlled operation:
  MD5              ();  // simple initializer
  void  update     (unsigned char *input, unsigned int input_length);
  void  update     (istream& stream);
  void  update     (FILE *file);
  void  update     (ifstream& stream);
  void  finalize   ();

// constructors for special circumstances.  All these constructors finalize
// the MD5 context.
  MD5              (unsigned char *string); // digest string, finalize
  MD5              (istream& stream);       // digest stream, finalize
  MD5              (FILE *file);            // digest file, close, finalize
  MD5              (ifstream& stream);      // digest stream, close, finalize

// methods to acquire finalized result
  unsigned char    *raw_digest ();  // digest as a 16-byte binary array
  char *            hex_digest ();  // digest as a 33-byte ascii-hex string
  friend ostream&   operator<< (ostream&, MD5 context);

private:

// 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

// 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        (uint1 *buffer);  // does the real update work.  Note 
                                          // that length is implied to be 64.

  static void encode    (uint1 *dest, uint4 *src, uint4 length);
  static void decode    (uint4 *dest, uint1 *src, uint4 length);
  static void memcpy    (uint1 *dest, uint1 *src, uint4 length);
  static void memset    (uint1 *start, uint1 val, uint4 length);

  static inline uint4  rotate_left (uint4 x, uint4 n);
  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 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);

};

MD5.cpp

// 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 "md5.h"

#include <assert.h>
#include <string.h>
#include <iostream.h>

// MD5 simple initialization method

MD5::MD5(){

  init();

}

// MD5 block update operation. Continues an MD5 message-digest
// operation, processing another message block, and updating the
// context.

void MD5::update (uint1 *input, uint4 input_length) {

  uint4 input_index, buffer_index;
  uint4 buffer_space;                // how much space is left in buffer

  if (finalized){  // so we can't update!
    cerr << "MD5::update:  Can't update a finalized digest!" << endl;
    return;
  }

  // Compute number of bytes mod 64
  buffer_index = (unsigned int)((count[0] >> 3) & 0x3F);

  // Update number of bits
  if (  (count[0] += ((uint4) input_length << 3))<((uint4) input_length << 3) )
    count[1]++;

  count[1] += ((uint4)input_length >> 29);

  buffer_space = 64 - buffer_index;  // how much space is left in buffer

  // Transform as many times as possible.
  if (input_length >= buffer_space) { // ie. we have enough to fill the buffer
    // fill the rest of the buffer and transform
    memcpy (buffer + buffer_index, input, buffer_space);
    transform (buffer);

    // now, transform each 64-byte piece of the input, bypassing the buffer
    for (input_index = buffer_space; input_index + 63 < input_length; 
	 input_index += 64)
      transform (input+input_index);

    buffer_index = 0;  // so we can buffer remaining
  }
  else
    input_index=0;     // so we can buffer the whole input

  // and here we do the buffering:
  memcpy(buffer+buffer_index, input+input_index, input_length-input_index);
}

// MD5 update for files.
// Like above, except that it works on files (and uses above as a primitive.)

void MD5::update(FILE *file){

  unsigned char buffer[1024];
  int len;

  while (len=fread(buffer, 1, 1024, file))
    update(buffer, len);

  fclose (file);

}

// MD5 update for istreams.
// Like update for files; see above.

void MD5::update(istream& stream){

  unsigned char buffer[1024];
  int len;

  while (stream.good()){
    stream.read(buffer, 1024); // note that return value of read is unusable.
    len=stream.gcount();
    update(buffer, len);
  }

}

// MD5 update for ifstreams.
// Like update for files; see above.

void MD5::update(ifstream& stream){

  unsigned char buffer[1024];
  int len;

  while (stream.good()){
    stream.read(buffer, 1024); // note that return value of read is unusable.
    len=stream.gcount();
    update(buffer, len);
  }

}

// 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 uint1 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){
    cerr << "MD5::finalize:  Already finalized this digest!" << endl;
    return;
  }

  // Save number of bits
  encode (bits, count, 8);

  // Pad out to 56 mod 64.
  index = (uint4) ((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;

}

MD5::MD5(FILE *file){

  init();  // must be called be all constructors
  update(file);
  finalize ();
}

MD5::MD5(istream& stream){

  init();  // must called by all constructors
  update (stream);
  finalize();
}

MD5::MD5(ifstream& stream){

  init();  // must called by all constructors
  update (stream);
  finalize();
}

unsigned char *MD5::raw_digest(){

  uint1 *s = new uint1[16];

  if (!finalized){
    cerr << "MD5::raw_digest:  Can't get digest if you haven't "<<
      "finalized the digest!" <<endl;
    return ( (unsigned char*) "");
  }

  memcpy(s, digest, 16);
  return s;
}

char *MD5::hex_digest(){

  int i;
  char *s= new char[33];

  if (!finalized){
    cerr << "MD5::hex_digest:  Can't get digest if you haven't "<<
      "finalized the digest!" <<endl;
    return "";
  }

  for (i=0; i<16; i++)
    sprintf(s+i*2, "%02x", digest[i]);

  s[32]='\0';

  return s;
}

ostream& operator<<(ostream &stream, MD5 context){

  stream << context.hex_digest();
  return stream;
}

// 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;
}

// 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

// MD5 basic transformation. Transforms state based on block.
void MD5::transform (uint1 block[64]){

  uint4 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 ( (uint1 *) x, 0, sizeof(x));

}

// Encodes input (UINT4) into output (unsigned char). Assumes len is
// a multiple of 4.
void MD5::encode (uint1 *output, uint4 *input, uint4 len) {

  unsigned int i, j;

  for (i = 0, j = 0; j < len; i++, j += 4) {
    output[j]   = (uint1)  (input[i] & 0xff);
    output[j+1] = (uint1) ((input[i] >> 8) & 0xff);
    output[j+2] = (uint1) ((input[i] >> 16) & 0xff);
    output[j+3] = (uint1) ((input[i] >> 24) & 0xff);
  }
}

// Decodes input (unsigned char) into output (UINT4). Assumes len is
// a multiple of 4.
void MD5::decode (uint4 *output, uint1 *input, uint4 len){

  unsigned int i, j;

  for (i = 0, j = 0; j < len; i++, j += 4)
    output[i] = ((uint4)input[j]) | (((uint4)input[j+1]) << 8) |
      (((uint4)input[j+2]) << 16) | (((uint4)input[j+3]) << 24);
}

// Note: Replace "for loop" with standard memcpy if possible.
void MD5::memcpy (uint1 *output, uint1 *input, uint4 len){

  unsigned int i;

  for (i = 0; i < len; i++)
    output[i] = input[i];
}

// Note: Replace "for loop" with standard memset if possible.
void MD5::memset (uint1 *output, uint1 value, uint4 len){

  unsigned int i;

  for (i = 0; i < len; i++)
    output[i] = value;
}

// ROTATE_LEFT rotates x left n bits.

inline unsigned int MD5::rotate_left  (uint4 x, uint4 n){
  return (x << n) | (x >> (32-n))  ;
}

// F, G, H and I are basic MD5 functions.

inline unsigned int MD5::F            (uint4 x, uint4 y, uint4 z){
  return (x & y) | (~x & z);
}

inline unsigned int MD5::G            (uint4 x, uint4 y, uint4 z){
  return (x & z) | (y & ~z);
}

inline unsigned int MD5::H            (uint4 x, uint4 y, uint4 z){
  return x ^ y ^ z;
}

inline unsigned int MD5::I            (uint4 x, uint4 y, uint4 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.

inline void MD5::FF(uint4& a, uint4 b, uint4 c, uint4 d, uint4 x, 
		    uint4  s, uint4 ac){
 a += F(b, c, d) + x + ac;
 a = rotate_left (a, s) +b;
}

inline void MD5::GG(uint4& a, uint4 b, uint4 c, uint4 d, uint4 x, 
		    uint4 s, uint4 ac){
 a += G(b, c, d) + x + ac;
 a = rotate_left (a, s) +b;
}

inline void MD5::HH(uint4& a, uint4 b, uint4 c, uint4 d, uint4 x, 
		    uint4 s, uint4 ac){
 a += H(b, c, d) + x + ac;
 a = rotate_left (a, s) +b;
}

inline void MD5::II(uint4& a, uint4 b, uint4 c, uint4 d, uint4 x, 
			     uint4 s, uint4 ac){
 a += I(b, c, d) + x + ac;
 a = rotate_left (a, s) +b;
}

Beispiel:

// cBuffer, iLen irgendwas zuweisen

    MD5 * MyMD5 = new MD5();

    MyMD5->update(cBuffer, iLen);
    MyMD5->finalize();

    unsigned char * cMD5Buffer = new unsigned char[26];

    cMD5Buffer = MyMD5->raw_digest();

    delete MD5

[funztdoch]

Quatsch, die Indy Komponente MD5 liefert absolut den richtigen Hash.

[anonym]

Ich verwende für solche Sachen DCPCrypt.
http://www.cityinthesky.co.uk/cryptography.html
Da gibt es dann auch noch andere Hash-Algorithmen und auch Verschlüsselungs-Algorithmen.
Läuft im C++-Builder 5 und 6.

[Zero01]

Super Anonym und Acidmrp !
Sowas kann man immer gut gebrauchen

Edit: Wie genial ist das denn damit verschlüssel ich meine user database files

[Heinzelmännchen]

Hallo, kann mir einer mal ein kleines Beispiel für Acidmrp MD5 Klasse liefern, wie ich folgenden String als MD5 Codieren lasse: "abc123" (ohne quotes)

Habe es nämlich mit der Indy Compo probiert, doch diese liefert mir nicht das gleiche Resultat wie die PHP Funktion md5().

Hier derzeit mein Code von der Verwendung der Indy Compo:

IdCoderMD51->Reset() ;
                IdCoderMD51->AutoCompleteInput = true ;
                IdCoderMD51->CodeString("abc123") ;
                AnsiString sMD5Code = IdCoderMD51->CompletedInput() ;
                AnsiString sMD5Hex ;
                for ( int i = 1 ; i < sMD5Code.Length() ; i++ ) {
                        sMD5Hex += LowerCase(IntToHex( BYTE(sMD5Code[i]), 2 )) ;
                }

Wäre klasse wenn einer 'ne Antwort parat hätte.

MfG
Heinz

[Heinzelmännchen]

Habe mich noch einmal mit Acidmrp's Klasse beschäftigt.

Also die Zuordnung hätte ich da wohl schon. Nur bekomme ich jetzt mehrere Linker Fehler und damit kenne ich mich derzeit gar nicht aus.

[Linker Fehler] Unresolved external 'MD5::MD5()' referenced from D:\MD5\UNIT1.OBJ
[Linker Fehler] Unresolved external 'MD5::update(unsigned char *, unsigned int)' referenced from D:\MD5\UNIT1.OBJ
[Linker Fehler] Unresolved external 'MD5::finalize()' referenced from D:\MD5\UNIT1.OBJ
[Linker Fehler] Unresolved external 'MD5::hex_digest()' referenced from D:\MD5\UNIT1.OBJ

Mein Code ist derzeit folgender:

// cBuffer, iLen irgendwas zuweisen

    MD5 * MyMD5 = new MD5();

    unsigned char buffer[1024] = "abc123" ;
    MyMD5->update( buffer, 6 ) ;
    MyMD5->finalize();

    char * cMD5Buffer = new char[33];

    cMD5Buffer = MyMD5->hex_digest();

    delete MyMD5 ;

[Jansen]

Der Linker findet die Dateien der MD5-Klasse nicht, das entsprechende Verzeichnis solltest du in den Projektoptionen sowohl in den Source- als auch den Library-Pfad mit aufnehmen.

[Heinzelmännchen]

Ich hatte vergessen die MD5.cpp dem Projekt zu zuordnen. Funktioniert jetzt bestens!