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();}