package org.bearfly.test.md5;
 
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
 
public class MD5Utils {
 public static void main(String[] args){
 System.out.println(getMd5String(""));
 System.out.println(MD5("good"));
 }
 
 
 public final static String MD5(String s) {
 char hexDigits[] = { '0', '1', '2', '3', '4',
    '5', '6', '7', '8', '9',
    'A', 'B', 'C', 'D', 'E', 'F' };
 try {
  byte[] btInput = s.getBytes();
 //获得MD5摘要算法的 MessageDigest 对象
  MessageDigest mdInst = MessageDigest.getInstance("MD5");
 //使用指定的字节更新摘要
  mdInst.update(btInput);
 //获得密文
  byte[] md = mdInst.digest();
 //把密文转换成十六进制的字符串形式
  int j = md.length;
  char str[] = new char[j * 2];
  int k = 0;
  for (int i = 0; i < j; i++) {
  byte byte0 = md[i];
  str[k++] = hexDigits[byte0 > 4 & 0xf];
  str[k++] = hexDigits[byte0 & 0xf];
  }
  return new String(str);
 }
 catch (Exception e) {
  e.printStackTrace();
  return null;
 }
 }
 
 
 
 public static String getMd5String(String str){
 MessageDigest messageDigest = null; 
  
 try { 
  messageDigest = MessageDigest.getInstance("MD5"); 
 
  messageDigest.reset(); 
 
  messageDigest.update(str.getBytes("UTF-8")); 
 } catch (NoSuchAlgorithmException e) { 
  System.out.println("NoSuchAlgorithmException caught!"); 
  System.exit(-1); 
 } catch (UnsupportedEncodingException e) { 
  e.printStackTrace(); 
 } 
 
 byte[] byteArray = messageDigest.digest(); 
 
 StringBuffer md5StrBuff = new StringBuffer(); 
 
 for (int i = 0; i < byteArray.length; i++) {  
  if (Integer.toHexString(0xFF & byteArray[i]).length() == 1) 
  md5StrBuff.append("0").append(Integer.toHexString(0xFF & byteArray[i])); 
  else 
  md5StrBuff.append(Integer.toHexString(0xFF & byteArray[i])); 
 } 
 
 return md5StrBuff.toString(); 
 }
}

var hexcase = 0; /* hex output format. 0 - lowercase; 1 - uppercase */
var b64pad = ""; /* base-64 pad character. "=" for strict RFC compliance */
var chrsz = 8; /* bits per input character. 8 - ASCII; 16 - Unicode */
 
/*
 * These are the functions you'll usually want to call
 * They take string arguments and return either hex or base-64 encoded strings
 */
function hex_md5(s){ return binl2hex(core_md5(str2binl(s), s.length * chrsz));}
function b64_md5(s){ return binl2b64(core_md5(str2binl(s), s.length * chrsz));}
function str_md5(s){ return binl2str(core_md5(str2binl(s), s.length * chrsz));}
function hex_hmac_md5(key, data) { return binl2hex(core_hmac_md5(key, data)); }
function b64_hmac_md5(key, data) { return binl2b64(core_hmac_md5(key, data)); }
function str_hmac_md5(key, data) { return binl2str(core_hmac_md5(key, data)); }
 
/*
 * Perform a simple self-test to see if the VM is working
 */
function md5_vm_test()
{
 return hex_md5("abc") == "900150983cd24fb0d6963f7d28e17f72";
}
 
/*
 * Calculate the MD5 of an array of little-endian words, and a bit length
 */
function core_md5(x, len)
{
 /* append padding */
 x[len  5] |= 0x80 << ((len) % 32);
 x[(((len + 64) > 9) << 4) + 14] = len;
 
 var a = 1732584193;
 var b = -271733879;
 var c = -1732584194;
 var d = 271733878;
 
 for(var i = 0; i < x.length; i += 16)
 {
 var olda = a;
 var oldb = b;
 var oldc = c;
 var oldd = d;
 
 a = md5_ff(a, b, c, d, x[i+ 0], 7 , -680876936);
 d = md5_ff(d, a, b, c, x[i+ 1], 12, -389564586);
 c = md5_ff(c, d, a, b, x[i+ 2], 17, 606105819);
 b = md5_ff(b, c, d, a, x[i+ 3], 22, -1044525330);
 a = md5_ff(a, b, c, d, x[i+ 4], 7 , -176418897);
 d = md5_ff(d, a, b, c, x[i+ 5], 12, 1200080426);
 c = md5_ff(c, d, a, b, x[i+ 6], 17, -1473231341);
 b = md5_ff(b, c, d, a, x[i+ 7], 22, -45705983);
 a = md5_ff(a, b, c, d, x[i+ 8], 7 , 1770035416);
 d = md5_ff(d, a, b, c, x[i+ 9], 12, -1958414417);
 c = md5_ff(c, d, a, b, x[i+10], 17, -42063);
 b = md5_ff(b, c, d, a, x[i+11], 22, -1990404162);
 a = md5_ff(a, b, c, d, x[i+12], 7 , 1804603682);
 d = md5_ff(d, a, b, c, x[i+13], 12, -40341101);
 c = md5_ff(c, d, a, b, x[i+14], 17, -1502002290);
 b = md5_ff(b, c, d, a, x[i+15], 22, 1236535329);
 
 a = md5_gg(a, b, c, d, x[i+ 1], 5 , -165796510);
 d = md5_gg(d, a, b, c, x[i+ 6], 9 , -1069501632);
 c = md5_gg(c, d, a, b, x[i+11], 14, 643717713);
 b = md5_gg(b, c, d, a, x[i+ 0], 20, -373897302);
 a = md5_gg(a, b, c, d, x[i+ 5], 5 , -701558691);
 d = md5_gg(d, a, b, c, x[i+10], 9 , 38016083);
 c = md5_gg(c, d, a, b, x[i+15], 14, -660478335);
 b = md5_gg(b, c, d, a, x[i+ 4], 20, -405537848);
 a = md5_gg(a, b, c, d, x[i+ 9], 5 , 568446438);
 d = md5_gg(d, a, b, c, x[i+14], 9 , -1019803690);
 c = md5_gg(c, d, a, b, x[i+ 3], 14, -187363961);
 b = md5_gg(b, c, d, a, x[i+ 8], 20, 1163531501);
 a = md5_gg(a, b, c, d, x[i+13], 5 , -1444681467);
 d = md5_gg(d, a, b, c, x[i+ 2], 9 , -51403784);
 c = md5_gg(c, d, a, b, x[i+ 7], 14, 1735328473);
 b = md5_gg(b, c, d, a, x[i+12], 20, -1926607734);
 
 a = md5_hh(a, b, c, d, x[i+ 5], 4 , -378558);
 d = md5_hh(d, a, b, c, x[i+ 8], 11, -2022574463);
 c = md5_hh(c, d, a, b, x[i+11], 16, 1839030562);
 b = md5_hh(b, c, d, a, x[i+14], 23, -35309556);
 a = md5_hh(a, b, c, d, x[i+ 1], 4 , -1530992060);
 d = md5_hh(d, a, b, c, x[i+ 4], 11, 1272893353);
 c = md5_hh(c, d, a, b, x[i+ 7], 16, -155497632);
 b = md5_hh(b, c, d, a, x[i+10], 23, -1094730640);
 a = md5_hh(a, b, c, d, x[i+13], 4 , 681279174);
 d = md5_hh(d, a, b, c, x[i+ 0], 11, -358537222);
 c = md5_hh(c, d, a, b, x[i+ 3], 16, -722521979);
 b = md5_hh(b, c, d, a, x[i+ 6], 23, 76029189);
 a = md5_hh(a, b, c, d, x[i+ 9], 4 , -640364487);
 d = md5_hh(d, a, b, c, x[i+12], 11, -421815835);
 c = md5_hh(c, d, a, b, x[i+15], 16, 530742520);
 b = md5_hh(b, c, d, a, x[i+ 2], 23, -995338651);
 
 a = md5_ii(a, b, c, d, x[i+ 0], 6 , -198630844);
 d = md5_ii(d, a, b, c, x[i+ 7], 10, 1126891415);
 c = md5_ii(c, d, a, b, x[i+14], 15, -1416354905);
 b = md5_ii(b, c, d, a, x[i+ 5], 21, -57434055);
 a = md5_ii(a, b, c, d, x[i+12], 6 , 1700485571);
 d = md5_ii(d, a, b, c, x[i+ 3], 10, -1894986606);
 c = md5_ii(c, d, a, b, x[i+10], 15, -1051523);
 b = md5_ii(b, c, d, a, x[i+ 1], 21, -2054922799);
 a = md5_ii(a, b, c, d, x[i+ 8], 6 , 1873313359);
 d = md5_ii(d, a, b, c, x[i+15], 10, -30611744);
 c = md5_ii(c, d, a, b, x[i+ 6], 15, -1560198380);
 b = md5_ii(b, c, d, a, x[i+13], 21, 1309151649);
 a = md5_ii(a, b, c, d, x[i+ 4], 6 , -145523070);
 d = md5_ii(d, a, b, c, x[i+11], 10, -1120210379);
 c = md5_ii(c, d, a, b, x[i+ 2], 15, 718787259);
 b = md5_ii(b, c, d, a, x[i+ 9], 21, -343485551);
 
 a = safe_add(a, olda);
 b = safe_add(b, oldb);
 c = safe_add(c, oldc);
 d = safe_add(d, oldd);
 }
 return Array(a, b, c, d);
 
}
 
/*
 * These functions implement the four basic operations the algorithm uses.
 */
function md5_cmn(q, a, b, x, s, t)
{
 return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s),b);
}
function md5_ff(a, b, c, d, x, s, t)
{
 return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);
}
function md5_gg(a, b, c, d, x, s, t)
{
 return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);
}
function md5_hh(a, b, c, d, x, s, t)
{
 return md5_cmn(b ^ c ^ d, a, b, x, s, t);
}
function md5_ii(a, b, c, d, x, s, t)
{
 return md5_cmn(c ^ (b | (~d)), a, b, x, s, t);
}
 
/*
 * Calculate the HMAC-MD5, of a key and some data
 */
function core_hmac_md5(key, data)
{
 var bkey = str2binl(key);
 if(bkey.length > 16) bkey = core_md5(bkey, key.length * chrsz);
 
 var ipad = Array(16), opad = Array(16);
 for(var i = 0; i < 16; i++)
 {
 ipad[i] = bkey[i] ^ 0x36363636;
 opad[i] = bkey[i] ^ 0x5C5C5C5C;
 }
 
 var hash = core_md5(ipad.concat(str2binl(data)), 512 + data.length * chrsz);
 return core_md5(opad.concat(hash), 512 + 128);
}
 
/*
 * Add integers, wrapping at 2^32. This uses 16-bit operations internally
 * to work around bugs in some JS interpreters.
 */
function safe_add(x, y)
{
 var lsw = (x & 0xFFFF) + (y & 0xFFFF);
 var msw = (x  16) + (y  16) + (lsw  16);
 return (msw << 16) | (lsw & 0xFFFF);
}
 
/*
 * Bitwise rotate a 32-bit number to the left.
 */
function bit_rol(num, cnt)
{
 return (num << cnt) | (num > (32 - cnt));
}
 
/*
 * Convert a string to an array of little-endian words
 * If chrsz is ASCII, characters >255 have their hi-byte silently ignored.
 */
function str2binl(str)
{
 var bin = Array();
 var mask = (1 << chrsz) - 1;
 for(var i = 0; i < str.length * chrsz; i += chrsz)
 bin[i5] |= (str.charCodeAt(i / chrsz) & mask) << (i%32);
 return bin;
}
 
/*
 * Convert an array of little-endian words to a string
 */
function binl2str(bin)
{
 var str = "";
 var mask = (1 << chrsz) - 1;
 for(var i = 0; i < bin.length * 32; i += chrsz)
 str += String.fromCharCode((bin[i5] > (i % 32)) & mask);
 return str;
}
 
/*
 * Convert an array of little-endian words to a hex string.
 */
function binl2hex(binarray)
{
 var hex_tab = hexcase "0123456789ABCDEF" : "0123456789abcdef";
 var str = "";
 for(var i = 0; i < binarray.length * 4; i++)
 {
 str += hex_tab.charAt((binarray[i2]  ((i%4)*8+4)) & 0xF) +
  hex_tab.charAt((binarray[i2]  ((i%4)*8 )) & 0xF);
 }
 return str;
}
 
/*
 * Convert an array of little-endian words to a base-64 string
 */
function binl2b64(binarray)
{
 var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
 var str = "";
 for(var i = 0; i < binarray.length * 4; i += 3)
 {
 var triplet = (((binarray[i  2]  8 * ( i %4)) & 0xFF) << 16)
  | (((binarray[i+1  2]  8 * ((i+1)%4)) & 0xFF) << 8 )
  | ((binarray[i+2  2]  8 * ((i+2)%4)) & 0xFF);
 for(var j = 0; j < 4; j++)
 {
 if(i * 8 + j * 6 > binarray.length * 32) str += b64pad;
 else str += tab.charAt((triplet  6*(3-j)) & 0x3F);
 }
 }
 return str;
}

<html>
 <head>
 <title>md5_Test</title>
 <script type="text/javascript" src="/UploadFiles/2021-04-02/md5.js">

补充：javascript 的MD5代码备份，跟java互通


 var MD5 = function (string) { 
 
 function RotateLeft(lValue, iShiftBits) { 
  return (lValue<<iShiftBits) | (lValue>(32-iShiftBits)); 
 } 
 
 function AddUnsigned(lX,lY) { 
  var lX4,lY4,lX8,lY8,lResult; 
  lX8 = (lX & 0x80000000); 
  lY8 = (lY & 0x80000000); 
  lX4 = (lX & 0x40000000); 
  lY4 = (lY & 0x40000000); 
  lResult = (lX & 0x3FFFFFFF)+(lY & 0x3FFFFFFF); 
  if (lX4 & lY4) { 
  return (lResult ^ 0x80000000 ^ lX8 ^ lY8); 
  } 
  if (lX4 | lY4) { 
  if (lResult & 0x40000000) { 
   return (lResult ^ 0xC0000000 ^ lX8 ^ lY8); 
  } else { 
   return (lResult ^ 0x40000000 ^ lX8 ^ lY8); 
  } 
  } else { 
  return (lResult ^ lX8 ^ lY8); 
  } 
 } 
 
 function F(x,y,z) { return (x & y) | ((~x) & z); } 
 function G(x,y,z) { return (x & z) | (y & (~z)); } 
 function H(x,y,z) { return (x ^ y ^ z); } 
 function I(x,y,z) { return (y ^ (x | (~z))); } 
 
 function FF(a,b,c,d,x,s,ac) { 
  a = AddUnsigned(a, AddUnsigned(AddUnsigned(F(b, c, d), x), ac)); 
  return AddUnsigned(RotateLeft(a, s), b); 
 }; 
 
 function GG(a,b,c,d,x,s,ac) { 
  a = AddUnsigned(a, AddUnsigned(AddUnsigned(G(b, c, d), x), ac)); 
  return AddUnsigned(RotateLeft(a, s), b); 
 }; 
 
 function HH(a,b,c,d,x,s,ac) { 
  a = AddUnsigned(a, AddUnsigned(AddUnsigned(H(b, c, d), x), ac)); 
  return AddUnsigned(RotateLeft(a, s), b); 
 }; 
 
 function II(a,b,c,d,x,s,ac) { 
  a = AddUnsigned(a, AddUnsigned(AddUnsigned(I(b, c, d), x), ac)); 
  return AddUnsigned(RotateLeft(a, s), b); 
 }; 
 
 function ConvertToWordArray(string) { 
  var lWordCount; 
  var lMessageLength = string.length; 
  var lNumberOfWords_temp1=lMessageLength + 8; 
  var lNumberOfWords_temp2=(lNumberOfWords_temp1-(lNumberOfWords_temp1 % 64))/64; 
  var lNumberOfWords = (lNumberOfWords_temp2+1)*16; 
  var lWordArray=Array(lNumberOfWords-1); 
  var lBytePosition = 0; 
  var lByteCount = 0; 
  while ( lByteCount < lMessageLength ) { 
  lWordCount = (lByteCount-(lByteCount % 4))/4; 
  lBytePosition = (lByteCount % 4)*8; 
  lWordArray[lWordCount] = (lWordArray[lWordCount] | (string.charCodeAt(lByteCount)<<lBytePosition)); 
  lByteCount++; 
  } 
  lWordCount = (lByteCount-(lByteCount % 4))/4; 
  lBytePosition = (lByteCount % 4)*8; 
  lWordArray[lWordCount] = lWordArray[lWordCount] | (0x80<<lBytePosition); 
  lWordArray[lNumberOfWords-2] = lMessageLength<<3; 
  lWordArray[lNumberOfWords-1] = lMessageLength>29; 
  return lWordArray; 
 }; 
 
 function WordToHex(lValue) { 
  var WordToHexValue="",WordToHexValue_temp="",lByte,lCount; 
  for (lCount = 0;lCount<=3;lCount++) { 
  lByte = (lValue>(lCount*8)) & 255; 
  WordToHexValue_temp = "0" + lByte.toString(16); 
  WordToHexValue = WordToHexValue + WordToHexValue_temp.substr(WordToHexValue_temp.length-2,2); 
  } 
  return WordToHexValue; 
 }; 
 
 function Utf8Encode(string) { 
  string = string.replace(/\r\n/g,"\n"); 
  var utftext = ""; 
 
  for (var n = 0; n < string.length; n++) { 
 
  var c = string.charCodeAt(n); 
 
  if (c < 128) { 
   utftext += String.fromCharCode(c); 
  } 
  else if((c > 127) && (c < 2048)) { 
   utftext += String.fromCharCode((c  6) | 192); 
   utftext += String.fromCharCode((c & 63) | 128); 
  } 
  else { 
   utftext += String.fromCharCode((c  12) | 224); 
   utftext += String.fromCharCode(((c  6) & 63) | 128); 
   utftext += String.fromCharCode((c & 63) | 128); 
  } 
 
  } 
 
  return utftext; 
 }; 
 
 var x=Array(); 
 var k,AA,BB,CC,DD,a,b,c,d; 
 var S11=7, S12=12, S13=17, S14=22; 
 var S21=5, S22=9 , S23=14, S24=20; 
 var S31=4, S32=11, S33=16, S34=23; 
 var S41=6, S42=10, S43=15, S44=21; 
 
 string = Utf8Encode(string); 
 
 x = ConvertToWordArray(string); 
 
 a = 0x67452301; b = 0xEFCDAB89; c = 0x98BADCFE; d = 0x10325476; 
 
 for (k=0;k<x.length;k+=16) { 
  AA=a; BB=b; CC=c; DD=d; 
  a=FF(a,b,c,d,x[k+0], S11,0xD76AA478); 
  d=FF(d,a,b,c,x[k+1], S12,0xE8C7B756); 
  c=FF(c,d,a,b,x[k+2], S13,0x242070DB); 
  b=FF(b,c,d,a,x[k+3], S14,0xC1BDCEEE); 
  a=FF(a,b,c,d,x[k+4], S11,0xF57C0FAF); 
  d=FF(d,a,b,c,x[k+5], S12,0x4787C62A); 
  c=FF(c,d,a,b,x[k+6], S13,0xA8304613); 
  b=FF(b,c,d,a,x[k+7], S14,0xFD469501); 
  a=FF(a,b,c,d,x[k+8], S11,0x698098D8); 
  d=FF(d,a,b,c,x[k+9], S12,0x8B44F7AF); 
  c=FF(c,d,a,b,x[k+10],S13,0xFFFF5BB1); 
  b=FF(b,c,d,a,x[k+11],S14,0x895CD7BE); 
  a=FF(a,b,c,d,x[k+12],S11,0x6B901122); 
  d=FF(d,a,b,c,x[k+13],S12,0xFD987193); 
  c=FF(c,d,a,b,x[k+14],S13,0xA679438E); 
  b=FF(b,c,d,a,x[k+15],S14,0x49B40821); 
  a=GG(a,b,c,d,x[k+1], S21,0xF61E2562); 
  d=GG(d,a,b,c,x[k+6], S22,0xC040B340); 
  c=GG(c,d,a,b,x[k+11],S23,0x265E5A51); 
  b=GG(b,c,d,a,x[k+0], S24,0xE9B6C7AA); 
  a=GG(a,b,c,d,x[k+5], S21,0xD62F105D); 
  d=GG(d,a,b,c,x[k+10],S22,0x2441453); 
  c=GG(c,d,a,b,x[k+15],S23,0xD8A1E681); 
  b=GG(b,c,d,a,x[k+4], S24,0xE7D3FBC8); 
  a=GG(a,b,c,d,x[k+9], S21,0x21E1CDE6); 
  d=GG(d,a,b,c,x[k+14],S22,0xC33707D6); 
  c=GG(c,d,a,b,x[k+3], S23,0xF4D50D87); 
  b=GG(b,c,d,a,x[k+8], S24,0x455A14ED); 
  a=GG(a,b,c,d,x[k+13],S21,0xA9E3E905); 
  d=GG(d,a,b,c,x[k+2], S22,0xFCEFA3F8); 
  c=GG(c,d,a,b,x[k+7], S23,0x676F02D9); 
  b=GG(b,c,d,a,x[k+12],S24,0x8D2A4C8A); 
  a=HH(a,b,c,d,x[k+5], S31,0xFFFA3942); 
  d=HH(d,a,b,c,x[k+8], S32,0x8771F681); 
  c=HH(c,d,a,b,x[k+11],S33,0x6D9D6122); 
  b=HH(b,c,d,a,x[k+14],S34,0xFDE5380C); 
  a=HH(a,b,c,d,x[k+1], S31,0xA4BEEA44); 
  d=HH(d,a,b,c,x[k+4], S32,0x4BDECFA9); 
  c=HH(c,d,a,b,x[k+7], S33,0xF6BB4B60); 
  b=HH(b,c,d,a,x[k+10],S34,0xBEBFBC70); 
  a=HH(a,b,c,d,x[k+13],S31,0x289B7EC6); 
  d=HH(d,a,b,c,x[k+0], S32,0xEAA127FA); 
  c=HH(c,d,a,b,x[k+3], S33,0xD4EF3085); 
  b=HH(b,c,d,a,x[k+6], S34,0x4881D05); 
  a=HH(a,b,c,d,x[k+9], S31,0xD9D4D039); 
  d=HH(d,a,b,c,x[k+12],S32,0xE6DB99E5); 
  c=HH(c,d,a,b,x[k+15],S33,0x1FA27CF8); 
  b=HH(b,c,d,a,x[k+2], S34,0xC4AC5665); 
  a=II(a,b,c,d,x[k+0], S41,0xF4292244); 
  d=II(d,a,b,c,x[k+7], S42,0x432AFF97); 
  c=II(c,d,a,b,x[k+14],S43,0xAB9423A7); 
  b=II(b,c,d,a,x[k+5], S44,0xFC93A039); 
  a=II(a,b,c,d,x[k+12],S41,0x655B59C3); 
  d=II(d,a,b,c,x[k+3], S42,0x8F0CCC92); 
  c=II(c,d,a,b,x[k+10],S43,0xFFEFF47D); 
  b=II(b,c,d,a,x[k+1], S44,0x85845DD1); 
  a=II(a,b,c,d,x[k+8], S41,0x6FA87E4F); 
  d=II(d,a,b,c,x[k+15],S42,0xFE2CE6E0); 
  c=II(c,d,a,b,x[k+6], S43,0xA3014314); 
  b=II(b,c,d,a,x[k+13],S44,0x4E0811A1); 
  a=II(a,b,c,d,x[k+4], S41,0xF7537E82); 
  d=II(d,a,b,c,x[k+11],S42,0xBD3AF235); 
  c=II(c,d,a,b,x[k+2], S43,0x2AD7D2BB); 
  b=II(b,c,d,a,x[k+9], S44,0xEB86D391); 
  a=AddUnsigned(a,AA); 
  b=AddUnsigned(b,BB); 
  c=AddUnsigned(c,CC); 
  d=AddUnsigned(d,DD); 
 } 
 
 var temp = WordToHex(a)+WordToHex(b)+WordToHex(c)+WordToHex(d); 
 
 return temp.toLowerCase(); 
 }



以上就是本文的全部内容，java、javascript、MD5三者之间的关系，使用，希望对大家的学习有所帮助。