MD5算法详解与C语言实现：保护消息完整性的基石

#include "md5.h" 
#include <stdlib.h> 
#include<iostream>
using namespace std;
void main() 
{ 
char password[17],password1[17];   
char encrypt1[200] = {"123456789"}; 
MD5Digest(encrypt1,strlen(encrypt1),password);
password[16]='\0';
int i;
for(i=0;i<16;i++)
printf("%2x",password[i]);
system("pause");
//cout<<password;
}


#include   <stdio.h>   
#include   <stdlib.h>  
#include   <time.h>   
#include   <string.h>   
    
  typedef   unsigned   char   *POINTER;   
  typedef   unsigned   short   int   UINT2;   
  typedef   unsigned   long   int   UINT4;   
    
  typedef   struct     
  {   

  UINT4   state[4];   
  UINT4   count[2];   
  unsigned   char   buffer[64];   
  }   MD5_CTX;   
    
  void   MD5Init(MD5_CTX   *);   
  void   MD5Update(MD5_CTX   *,   unsigned   char   *,   unsigned   int);   
  void   MD5Final(unsigned   char   [16],   MD5_CTX   *);   
    
  #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   
    
  
 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,