MD5 Verschlüsselung

Mich würde das auch mal interessieren. Es fehlt da eine klare Abgrenzung, eine klare Funktion, wie einer meiner Vorredner das schon so schön dargestellt hat.

char* md5(void* datablock, size_t size);

sowas in der Art.
 
moin


Ich habs mal so gemacht:

.h
Code: 
#ifndef _MD5_H
#define _MD5_H

#ifndef uint8
#define uint8  unsigned char
#endif

#ifndef uint32
#define uint32 unsigned long int
#endif

typedef struct
{
    uint32 total[2];
    uint32 state[4];
    uint8 buffer[64];
}
md5_context;

void md5(char *text, unsigned char *hash);

void md5_starts( md5_context *ctx );
void md5_update( md5_context *ctx, uint8 *input, uint32 length );
void md5_finish( md5_context *ctx, uint8 digest[16] );

static char *msg[] = 
{
    "",
    "a",
    "abc",
    "message digest",
    "abcdefghijklmnopqrstuvwxyz",
    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789",
    "12345678901234567890123456789012345678901234567890123456789012" \
        "345678901234567890"
};

static char *val[] =
{
    "d41d8cd98f00b204e9800998ecf8427e",
    "0cc175b9c0f1b6a831c399e269772661",
    "900150983cd24fb0d6963f7d28e17f72",
    "f96b697d7cb7938d525a2f31aaf161d0",
    "c3fcd3d76192e4007dfb496cca67e13b",
    "d174ab98d277d9f5a5611c2c9f419d9f",
    "57edf4a22be3c955ac49da2e2107b67a"
};

#endif /* md5.h */

.cpp
Code: 
/*
*  RFC 1321 compliant MD5 implementation
*
*  Copyright (C) 2001-2003  Christophe Devine
*
*  This program is free software; you can redistribute it and/or modify
*  it under the terms of the GNU General Public License as published by
*  the Free Software Foundation; either version 2 of the License, or
*  (at your option) any later version.
*
*  This program 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.  See the
*  GNU General Public License for more details.
*
*  You should have received a copy of the GNU General Public License
*  along with this program; if not, write to the Free Software
*  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#include <string.h>

#include "md5.h"

#define GET_UINT32(n,b,i)                       \
{                                               \
	(n) = ( (uint32) (b)[(i)    ]       )       \
	| ( (uint32) (b)[(i) + 1] <<  8 )       \
	| ( (uint32) (b)[(i) + 2] << 16 )       \
	| ( (uint32) (b)[(i) + 3] << 24 );      \
}

#define PUT_UINT32(n,b,i)                       \
{                                               \
	(b)[(i)    ] = (uint8) ( (n)       );       \
	(b)[(i) + 1] = (uint8) ( (n) >>  8 );       \
	(b)[(i) + 2] = (uint8) ( (n) >> 16 );       \
	(b)[(i) + 3] = (uint8) ( (n) >> 24 );       \
}

void md5_starts( md5_context *ctx )
{
	ctx->total[0] = 0;
	ctx->total[1] = 0;

	ctx->state[0] = 0x67452301;
	ctx->state[1] = 0xEFCDAB89;
	ctx->state[2] = 0x98BADCFE;
	ctx->state[3] = 0x10325476;
}

void md5_process( md5_context *ctx, uint8 data[64] )
{
	uint32 X[16], A, B, C, D;

	GET_UINT32( X[0],  data,  0 );
	GET_UINT32( X[1],  data,  4 );
	GET_UINT32( X[2],  data,  8 );
	GET_UINT32( X[3],  data, 12 );
	GET_UINT32( X[4],  data, 16 );
	GET_UINT32( X[5],  data, 20 );
	GET_UINT32( X[6],  data, 24 );
	GET_UINT32( X[7],  data, 28 );
	GET_UINT32( X[8],  data, 32 );
	GET_UINT32( X[9],  data, 36 );
	GET_UINT32( X[10], data, 40 );
	GET_UINT32( X[11], data, 44 );
	GET_UINT32( X[12], data, 48 );
	GET_UINT32( X[13], data, 52 );
	GET_UINT32( X[14], data, 56 );
	GET_UINT32( X[15], data, 60 );

#define S(x,n) ((x << n) | ((x & 0xFFFFFFFF) >> (32 - n)))

#define P(a,b,c,d,k,s,t)                                \
	{                                                       \
	a += F(b,c,d) + X[k] + t; a = S(a,s) + b;           \
	}

	A = ctx->state[0];
	B = ctx->state[1];
	C = ctx->state[2];
	D = ctx->state[3];

#define F(x,y,z) (z ^ (x & (y ^ z)))

	P( A, B, C, D,  0,  7, 0xD76AA478 );
	P( D, A, B, C,  1, 12, 0xE8C7B756 );
	P( C, D, A, B,  2, 17, 0x242070DB );
	P( B, C, D, A,  3, 22, 0xC1BDCEEE );
	P( A, B, C, D,  4,  7, 0xF57C0FAF );
	P( D, A, B, C,  5, 12, 0x4787C62A );
	P( C, D, A, B,  6, 17, 0xA8304613 );
	P( B, C, D, A,  7, 22, 0xFD469501 );
	P( A, B, C, D,  8,  7, 0x698098D8 );
	P( D, A, B, C,  9, 12, 0x8B44F7AF );
	P( C, D, A, B, 10, 17, 0xFFFF5BB1 );
	P( B, C, D, A, 11, 22, 0x895CD7BE );
	P( A, B, C, D, 12,  7, 0x6B901122 );
	P( D, A, B, C, 13, 12, 0xFD987193 );
	P( C, D, A, B, 14, 17, 0xA679438E );
	P( B, C, D, A, 15, 22, 0x49B40821 );

#undef F

#define F(x,y,z) (y ^ (z & (x ^ y)))

	P( A, B, C, D,  1,  5, 0xF61E2562 );
	P( D, A, B, C,  6,  9, 0xC040B340 );
	P( C, D, A, B, 11, 14, 0x265E5A51 );
	P( B, C, D, A,  0, 20, 0xE9B6C7AA );
	P( A, B, C, D,  5,  5, 0xD62F105D );
	P( D, A, B, C, 10,  9, 0x02441453 );
	P( C, D, A, B, 15, 14, 0xD8A1E681 );
	P( B, C, D, A,  4, 20, 0xE7D3FBC8 );
	P( A, B, C, D,  9,  5, 0x21E1CDE6 );
	P( D, A, B, C, 14,  9, 0xC33707D6 );
	P( C, D, A, B,  3, 14, 0xF4D50D87 );
	P( B, C, D, A,  8, 20, 0x455A14ED );
	P( A, B, C, D, 13,  5, 0xA9E3E905 );
	P( D, A, B, C,  2,  9, 0xFCEFA3F8 );
	P( C, D, A, B,  7, 14, 0x676F02D9 );
	P( B, C, D, A, 12, 20, 0x8D2A4C8A );

#undef F

#define F(x,y,z) (x ^ y ^ z)

	P( A, B, C, D,  5,  4, 0xFFFA3942 );
	P( D, A, B, C,  8, 11, 0x8771F681 );
	P( C, D, A, B, 11, 16, 0x6D9D6122 );
	P( B, C, D, A, 14, 23, 0xFDE5380C );
	P( A, B, C, D,  1,  4, 0xA4BEEA44 );
	P( D, A, B, C,  4, 11, 0x4BDECFA9 );
	P( C, D, A, B,  7, 16, 0xF6BB4B60 );
	P( B, C, D, A, 10, 23, 0xBEBFBC70 );
	P( A, B, C, D, 13,  4, 0x289B7EC6 );
	P( D, A, B, C,  0, 11, 0xEAA127FA );
	P( C, D, A, B,  3, 16, 0xD4EF3085 );
	P( B, C, D, A,  6, 23, 0x04881D05 );
	P( A, B, C, D,  9,  4, 0xD9D4D039 );
	P( D, A, B, C, 12, 11, 0xE6DB99E5 );
	P( C, D, A, B, 15, 16, 0x1FA27CF8 );
	P( B, C, D, A,  2, 23, 0xC4AC5665 );

#undef F

#define F(x,y,z) (y ^ (x | ~z))

	P( A, B, C, D,  0,  6, 0xF4292244 );
	P( D, A, B, C,  7, 10, 0x432AFF97 );
	P( C, D, A, B, 14, 15, 0xAB9423A7 );
	P( B, C, D, A,  5, 21, 0xFC93A039 );
	P( A, B, C, D, 12,  6, 0x655B59C3 );
	P( D, A, B, C,  3, 10, 0x8F0CCC92 );
	P( C, D, A, B, 10, 15, 0xFFEFF47D );
	P( B, C, D, A,  1, 21, 0x85845DD1 );
	P( A, B, C, D,  8,  6, 0x6FA87E4F );
	P( D, A, B, C, 15, 10, 0xFE2CE6E0 );
	P( C, D, A, B,  6, 15, 0xA3014314 );
	P( B, C, D, A, 13, 21, 0x4E0811A1 );
	P( A, B, C, D,  4,  6, 0xF7537E82 );
	P( D, A, B, C, 11, 10, 0xBD3AF235 );
	P( C, D, A, B,  2, 15, 0x2AD7D2BB );
	P( B, C, D, A,  9, 21, 0xEB86D391 );

#undef F

	ctx->state[0] += A;
	ctx->state[1] += B;
	ctx->state[2] += C;
	ctx->state[3] += D;
}

void md5_update( md5_context *ctx, uint8 *input, uint32 length )
{
	uint32 left, fill;

	if( ! length ) return;

	left = ctx->total[0] & 0x3F;
	fill = 64 - left;

	ctx->total[0] += length;
	ctx->total[0] &= 0xFFFFFFFF;

	if( ctx->total[0] < length )
		ctx->total[1]++;

	if( left && length >= fill )
	{
		memcpy( (void *) (ctx->buffer + left),
			(void *) input, fill );
		md5_process( ctx, ctx->buffer );
		length -= fill;
		input  += fill;
		left = 0;
	}

	while( length >= 64 )
	{
		md5_process( ctx, input );
		length -= 64;
		input  += 64;
	}

	if( length )
	{
		memcpy( (void *) (ctx->buffer + left),
			(void *) input, length );
	}
}

static uint8 md5_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
};

void md5_finish( md5_context *ctx, uint8 digest[16] )
{
	uint32 last, padn;
	uint32 high, low;
	uint8 msglen[8];

	high = ( ctx->total[0] >> 29 )
		| ( ctx->total[1] <<  3 );
	low  = ( ctx->total[0] <<  3 );

	PUT_UINT32( low,  msglen, 0 );
	PUT_UINT32( high, msglen, 4 );

	last = ctx->total[0] & 0x3F;
	padn = ( last < 56 ) ? ( 56 - last ) : ( 120 - last );

	md5_update( ctx, md5_padding, padn );
	md5_update( ctx, msglen, 8 );

	PUT_UINT32( ctx->state[0], digest,  0 );
	PUT_UINT32( ctx->state[1], digest,  4 );
	PUT_UINT32( ctx->state[2], digest,  8 );
	PUT_UINT32( ctx->state[3], digest, 12 );
}

/*
* those are the standard RFC 1321 test vectors
*/

void md5(char *text, unsigned char *hash)
{
	md5_context ctx;
	md5_starts( &ctx );
	md5_update( &ctx, (uint8 *) text, (size_t)strlen(text));
	md5_finish( &ctx, hash );
}

Beispiel main Datei:
Code: 
#include <string.h>
#include <stdio.h>
#include <conio.h>
#include "md5.h"

int main( int argc, char *argv[] )
{
	
	unsigned char hashwert1[16];

	for(int i=0; i<32; i++)
		hashwert1[i] = '\0';

	char text1[30] = {"Hallo"};
	
	md5(text1, hashwert1);

	getch();
	return( 0 );
}


mfg
umbrasaxum
 
Zuletzt bearbeitet:
jccTeq hat gesagt.:
Mich würde das auch mal interessieren. Es fehlt da eine klare Abgrenzung, eine klare Funktion, wie einer meiner Vorredner das schon so schön dargestellt hat.

char* md5(void* datablock, size_t size);

sowas in der Art.
Zum Vergrößern anklicken....

Schau dir mal die openssl lib an, da gibt es eine Funktion wie du sie suchst :
Code: 
unsigned char *MD5(const unsigned char *d, unsigned long n, unsigned char *md);
 
Hmm, wenn ich versuche eine DLL mit der MD5-Funktion zu kompilieren, erhalte ich folgende Fehler:

Main Code.obj : error LNK2001: Nicht aufgelöstes externes Symbol ""void __cdecl md5(char *,unsigned char *)" (?md5@@YAXPADPAE@Z)".
fatal error LNK1120: 1 nicht aufgelöste externe Verweise.

Leider reicht mein Wissen zur Zeit nicht uas, um dieses Problem alleine zu beheben :/

MFG David
 
Um antworten zu können musst du eingeloggt sein.

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