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anagaiyahoocom on 07/08/11

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Last Edited at 07/08/11 07:47am

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base 64 decode and encode

/ Published in: JavaScript

will encode text to base 64 and decode

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var b64array = "ABCDEFGHIJKLMNOP" +
           "QRSTUVWXYZabcdef" +
           "ghijklmnopqrstuv" +
           "wxyz0123456789+/" +
           "=";

function encode64(input) {
    
    var base64 = "";
    var hex = "";
    var chr1, chr2, chr3 = "";
    var enc1, enc2, enc3, enc4 = "";
    var i = 0;

do {
        chr1 = input.charCodeAt(i++);
        chr2 = input.charCodeAt(i++);
        chr3 = input.charCodeAt(i++);
    
        enc1 = chr1 >> 2;
        enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
        enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
        enc4 = chr3 & 63;
    
        if (isNaN(chr2)) {
            enc3 = enc4 = 64;
        } else if (isNaN(chr3)) {
            enc4 = 64;
        }

base64  = base64  +
            b64array.charAt(enc1) +
            b64array.charAt(enc2) +
            b64array.charAt(enc3) +
            b64array.charAt(enc4);
        chr1 = chr2 = chr3 = "";
        enc1 = enc2 = enc3 = enc4 = "";
    } while (i < input.length);

//console.log(base64 );
    return base64;

}

function decode64(input) {
    
    var output = "";
    var hex = "";
    var chr1, chr2, chr3 = "";
    var enc1, enc2, enc3, enc4 = "";
    var i = 0;
    
    var base64test = /[^A-Za-z0-9\+\/\=]/g;
    
    if (!base64test.exec(input)) {
        throw new Error("There were invalid base64 characters in the input text.\n" +
              "Valid base64 characters are A-Z, a-z, 0-9, '+', '/',and '='\n" +
              "Expect errors in decoding.");
    }
        
    //input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

do {
        enc1 = b64array.indexOf(input.charAt(i++));
        enc2 = b64array.indexOf(input.charAt(i++));
        enc3 = b64array.indexOf(input.charAt(i++));
        enc4 = b64array.indexOf(input.charAt(i++));
        
        chr1 = (enc1 << 2) | (enc2 >> 4);
        chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
        chr3 = ((enc3 & 3) << 6) | enc4;
        
        output = output + String.fromCharCode(chr1);
        
        if (enc3 != 64) {
            output = output + String.fromCharCode(chr2);
        }
        if (enc4 != 64) {
            output = output + String.fromCharCode(chr3);
        }
    
        chr1 = chr2 = chr3 = "";
        enc1 = enc2 = enc3 = enc4 = "";
    
    } while (i < input.length);

//console.log(unescape(output));
    return output;
    
}

var inp = '<input type="hidden" name="ac15e53b6df3e8c82f6d8963793c1330" value="1" />';

encode = encode64(inp);
console.log(inp);
console.log(encode);
console.log(decode64(encode));

//Compact decode without invalid character checking and more compact

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