Java与C++实现相同的MD5加密算法简单实例

package com.lyz.utils.common; 
 
import java.io.unsupportedencodingexception; 
import java.security.messagedigest; 
import java.security.nosuchalgorithmexception; 
/** 
 * md5加密 
 * @author liuyazhuang 
 */ 
public class md5hash { 
 
  public static string md5java(string message) { 
    string digest = null; 
    try { 
      messagedigest md = messagedigest.getinstance("md5"); 
      byte[] hash = md.digest(message.getbytes("utf-8")); 
 
      //converting byte array to hexadecimal string 
      stringbuilder sb = new stringbuilder(2 * hash.length); 
      for (byte b : hash) { 
        sb.append(string.format("%02x", b & 0xff)); 
      } 
 
      digest = sb.tostring(); 
 
    } catch (unsupportedencodingexception ex) { 
      //logger.getlogger(stringreplace.class.getname()).log(level.severe, null, ex); 
    } catch (nosuchalgorithmexception ex) { 
      //logger.getlogger(stringreplace.class.getname()).log(level.severe, null, ex); 
    } 
    return digest; 
  } 
  public static void main(string[] args) { 
    system.out.println(md5java("admin").touppercase()); 
  } 
}

#include  <stdio.h> 
#include  <stdlib.h>
#include  <time.h> 
#include  <string.h> 
void  md5digest(char  *pszinput,  unsigned  long  ninputsize,  char  *pszoutput);

#include  <stdio.h> 
#include  <stdlib.h>
#include  <time.h> 
#include  <string.h> 
#include  "md5.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, 
 0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0 
}; 

#define  f(x,  y,  z)  (((x)  &  (y))  |  ((~x)  &  (z))) 
#define  g(x,  y,  z)  (((x)  &  (z))  |  ((y)  &  (~z))) 
#define  h(x,  y,  z)  ((x)  ^  (y)  ^  (z)) 
#define  i(x,  y,  z)  ((y)  ^  ((x)  |  (~z))) 

#define  rotate_left(x,  n)  (((x)  <<  (n))  |  ((x)  >>  (32-(n)))) 

#define  ff(a,  b,  c,  d,  x,  s,  ac)  {   (a)  +=  f  ((b),  (c),  (d))  +  (x)  +  (uint4)(ac);   (a)  =  rotate_left  ((a),  (s));   (a)  +=  (b);    } 
#define  gg(a,  b,  c,  d,  x,  s,  ac)  {   (a)  +=  g  ((b),  (c),  (d))  +  (x)  +  (uint4)(ac);   (a)  =  rotate_left  ((a),  (s));   (a)  +=  (b);    } 
#define  hh(a,  b,  c,  d,  x,  s,  ac)  {   (a)  +=  h  ((b),  (c),  (d))  +  (x)  +  (uint4)(ac);   (a)  =  rotate_left  ((a),  (s));   (a)  +=  (b);    } 
#define  ii(a,  b,  c,  d,  x,  s,  ac)  {   (a)  +=  i  ((b),  (c),  (d))  +  (x)  +  (uint4)(ac);   (a)  =  rotate_left  ((a),  (s));   (a)  +=  (b);  } 


inline  void  encode(unsigned  char  *output,  uint4  *input,  unsigned  int  len) 
{ 
 unsigned  int  i,  j; 
 
 for  (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); 
 } 
} 

inline  void  decode(uint4  *output,  unsigned  char  *input,  unsigned  int  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); 
} 

inline  void  md5transform  (uint4  state[4],  unsigned  char  block[64]) 
{ 
 uint4  a  =  state[0],  b  =  state[1],  c  =  state[2],  d  =  state[3],  x[16]; 
 decode  (x,  block,  64); 
 ff  (a,  b,  c,  d,  x[  0],  s11,  0xd76aa478);  
 ff  (d,  a,  b,  c,  x[  1],  s12,  0xe8c7b756);  
 ff  (c,  d,  a,  b,  x[  2],  s13,  0x242070db);  
 ff  (b,  c,  d,  a,  x[  3],  s14,  0xc1bdceee);  
 ff  (a,  b,  c,  d,  x[  4],  s11,  0xf57c0faf);  
 ff  (d,  a,  b,  c,  x[  5],  s12,  0x4787c62a);  
 ff  (c,  d,  a,  b,  x[  6],  s13,  0xa8304613);  
 ff  (b,  c,  d,  a,  x[  7],  s14,  0xfd469501);  
 ff  (a,  b,  c,  d,  x[  8],  s11,  0x698098d8); 
 ff  (d,  a,  b,  c,  x[  9],  s12,  0x8b44f7af);  
 ff  (c,  d,  a,  b,  x[10],  s13,  0xffff5bb1);  
 ff  (b,  c,  d,  a,  x[11],  s14,  0x895cd7be); 
 ff  (a,  b,  c,  d,  x[12],  s11,  0x6b901122);  
 ff  (d,  a,  b,  c,  x[13],  s12,  0xfd987193); 
 ff  (c,  d,  a,  b,  x[14],  s13,  0xa679438e); 
 ff  (b,  c,  d,  a,  x[15],  s14,  0x49b40821); 
 gg  (a,  b,  c,  d,  x[  1],  s21,  0xf61e2562); 
 gg  (d,  a,  b,  c,  x[  6],  s22,  0xc040b340);  
 gg  (c,  d,  a,  b,  x[11],  s23,  0x265e5a51);  
 gg  (b,  c,  d,  a,  x[  0],  s24,  0xe9b6c7aa);  
 gg  (a,  b,  c,  d,  x[  5],  s21,  0xd62f105d);  
 gg  (d,  a,  b,  c,  x[10],  s22,   0x2441453); 
 gg  (c,  d,  a,  b,  x[15],  s23,  0xd8a1e681);  
 gg  (b,  c,  d,  a,  x[  4],  s24,  0xe7d3fbc8); 
 gg  (a,  b,  c,  d,  x[  9],  s21,  0x21e1cde6);  
 gg  (d,  a,  b,  c,  x[14],  s22,  0xc33707d6); 
 gg  (c,  d,  a,  b,  x[  3],  s23,  0xf4d50d87); 
 gg  (b,  c,  d,  a,  x[  8],  s24,  0x455a14ed); 
 gg  (a,  b,  c,  d,  x[13],  s21,  0xa9e3e905);  
 gg  (d,  a,  b,  c,  x[  2],  s22,  0xfcefa3f8); 
 gg  (c,  d,  a,  b,  x[  7],  s23,  0x676f02d9); 
 gg  (b,  c,  d,  a,  x[12],  s24,  0x8d2a4c8a);  
 hh  (a,  b,  c,  d,  x[  5],  s31,  0xfffa3942); 
 hh  (d,  a,  b,  c,  x[  8],  s32,  0x8771f681); 
 hh  (c,  d,  a,  b,  x[11],  s33,  0x6d9d6122); 
 hh  (b,  c,  d,  a,  x[14],  s34,  0xfde5380c);  
 hh  (a,  b,  c,  d,  x[  1],  s31,  0xa4beea44);  
 hh  (d,  a,  b,  c,  x[  4],  s32,  0x4bdecfa9);  
 hh  (c,  d,  a,  b,  x[  7],  s33,  0xf6bb4b60);  
 hh  (b,  c,  d,  a,  x[10],  s34,  0xbebfbc70);  
 hh  (a,  b,  c,  d,  x[13],  s31,  0x289b7ec6);  
 hh  (d,  a,  b,  c,  x[  0],  s32,  0xeaa127fa); 
 hh  (c,  d,  a,  b,  x[  3],  s33,  0xd4ef3085); 
 hh  (b,  c,  d,  a,  x[  6],  s34,   0x4881d05); 
 hh  (a,  b,  c,  d,  x[  9],  s31,  0xd9d4d039);  
 hh  (d,  a,  b,  c,  x[12],  s32,  0xe6db99e5); 
 hh  (c,  d,  a,  b,  x[15],  s33,  0x1fa27cf8);  
 hh  (b,  c,  d,  a,  x[  2],  s34,  0xc4ac5665); 
 ii  (a,  b,  c,  d,  x[  0],  s41,  0xf4292244); 
 ii  (d,  a,  b,  c,  x[  7],  s42,  0x432aff97); 
 ii  (c,  d,  a,  b,  x[14],  s43,  0xab9423a7);  
 ii  (b,  c,  d,  a,  x[  5],  s44,  0xfc93a039);  
 ii  (a,  b,  c,  d,  x[12],  s41,  0x655b59c3); 
 ii  (d,  a,  b,  c,  x[  3],  s42,  0x8f0ccc92);  
 ii  (c,  d,  a,  b,  x[10],  s43,  0xffeff47d);  
 ii  (b,  c,  d,  a,  x[  1],  s44,  0x85845dd1);  
 ii  (a,  b,  c,  d,  x[  8],  s41,  0x6fa87e4f);  
 ii  (d,  a,  b,  c,  x[15],  s42,  0xfe2ce6e0); 
 ii  (c,  d,  a,  b,  x[  6],  s43,  0xa3014314); 
 ii  (b,  c,  d,  a,  x[13],  s44,  0x4e0811a1); 
 ii  (a,  b,  c,  d,  x[  4],  s41,  0xf7537e82); 
 ii  (d,  a,  b,  c,  x[11],  s42,  0xbd3af235); 
 ii  (c,  d,  a,  b,  x[  2],  s43,  0x2ad7d2bb);  
 ii  (b,  c,  d,  a,  x[  9],  s44,  0xeb86d391); 
 state[0]  +=  a; 
 state[1]  +=  b; 
 state[2]  +=  c; 
 state[3]  +=  d; 
 memset  ((pointer)x,  0,  sizeof  (x)); 
 } 
  
inline  void  md5init(md5_ctx  *context) 
{ 
 context->count[0]  =  context->count[1]  =  0; 
 context->state[0]  =  0x67452301; 
 context->state[1]  =  0xefcdab89; 
 context->state[2]  =  0x98badcfe; 
 context->state[3]  =  0x10325476; 
} 

inline  void  md5update(md5_ctx  *context,  unsigned  char  *input,  unsigned  int  inputlen) 
{ 
 unsigned  int  i,  index,  partlen; 
 
 index  =  (unsigned  int)((context->count[0]  >>  3)  &  0x3f); 
 if  ((context->count[0]  +=  ((uint4)inputlen  <<  3)) 
  <  ((uint4)inputlen  <<  3)) 
  context->count[1]++; 
 context->count[1]  +=  ((uint4)inputlen  >>  29); 
 
 partlen  =  64  -  index; 
 
 if  (inputlen  >=  partlen)  { 
  memcpy((pointer)&context->buffer[index],  (pointer)input,  partlen); 
  md5transform(context->state,  context->buffer); 
  
  for  (i  =  partlen;  i  +  63  <  inputlen;  i  +=  64) 
   md5transform  (context->state,  &input[i]); 
  index  =  0; 
 } 
 else 
  i  =  0; 
 
 memcpy((pointer)&context->buffer[index],  (pointer)&input[i],  inputlen-i); 
} 

inline  void  md5final(unsigned  char  digest[16],  md5_ctx  *context) 
{ 
 unsigned  char  bits[8]; 
 unsigned  int  index,  padlen; 
 
 encode  (bits,  context->count,  8); 
 index  =  (unsigned  int)((context->count[0]  >>  3)  &  0x3f); 
 padlen  =  (index  <  56)  ?  (56  -  index)  :  (120  -  index); 
 md5update  (context,  padding,  padlen); 
 md5update  (context,  bits,  8); 
 encode  (digest,  context->state,  16); 
 memset  ((pointer)context,  0,  sizeof  (*context)); 
 } 

void  md5digest(char  *pszinput,  unsigned  long  ninputsize,  char  *pszoutput) 
{ 
 md5_ctx  context; 
 unsigned  int  len  =  strlen  (pszinput); 
 
 md5init  (&context); 
 md5update  (&context,  (unsigned  char  *)pszinput,  len); 
 md5final  ((unsigned  char  *)pszoutput,  &context); 
} 

main() 
{ char szdigest[16]; 
 char encrypt[200]; 
 printf("请输入要计算md5值的字符串:");
 gets(encrypt);
 printf("\n加密结果:");
 md5digest(encrypt,strlen(encrypt),szdigest); 
 int i;
 for (i=0;i<16;i++) printf ("%02x",(unsigned char)szdigest[i]);
 getchar();

}