The md5() function (presented in this page) can be used in JavaScript to calculate the MD5 hash of a string. Returns the hash as a 32-character hexadecimal number.


Code of the md5() function

/**
* MD5 (Message-Digest Algorithm)
* http://www.webtoolkit.info/
**/

function md5(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();
}
- Usage:
1. Copy the md5() function into your JavaScript script.
2. To get the MD5 hash of a string, calls the md5() function:   md5('string'); .

- Example. The string entered into an input text field will be encrypted with MD5, and added into another input form field.
<h4>Example JavaScript MD5</h4>

<form action='#' method='post'>
 Enter a text:<br/>
 <input type='text' name='strex' id='strex' size='20' /> <input type='button' id='codemd5' value='Get MD5' /><br>
 MD5 hash string:<br>
 <input type='text' name='strmd5' id='strmd5' size='33' />
</form>

<script>
//code of the md5() function
function md5(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();}

// register onclick events for 'Get MD5' button
document.getElementById('codemd5').onclick = function() {
 var txt_string = document.getElementById('strex').value; // gets data from input text

 // encrypts data and adds it in #strmd5 element
 document.getElementById('strmd5').value = md5(txt_string);
 return false;
}
</script>
Demo:
Enter a text:

MD5 hash string:

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