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Javascript Base64 Encode/Decode Source 본문

IT/Security

Javascript Base64 Encode/Decode Source

Hotman 2013. 10. 16. 11:26 

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<title>Base64 encoding/decoding test</title>
<script type="text/javascript">
/**
*
* Base64 encode / decode
* http://www.webtoolkit.info/
*
**/

var Base64 = {

// private property
_keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",

// public method for encoding
encode : function (input) {
var output = "";
var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
var i = 0;

input = Base64._utf8_encode(input);

while (i < input.length) {

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;
}

output = output +
this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) +
this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);

}

return output;
},

// public method for decoding
decode : function (input) {
var output = "";
var chr1, chr2, chr3;
var enc1, enc2, enc3, enc4;
var i = 0;

input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

while (i < input.length) {

enc1 = this._keyStr.indexOf(input.charAt(i++));
enc2 = this._keyStr.indexOf(input.charAt(i++));
enc3 = this._keyStr.indexOf(input.charAt(i++));
enc4 = this._keyStr.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);
}

}

output = Base64._utf8_decode(output);

return output;

},

// private method for UTF-8 encoding
_utf8_encode : function (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;
},

// private method for UTF-8 decoding
_utf8_decode : function (utftext) {
var string = "";
var i = 0;
var c = c1 = c2 = 0;

while ( i < utftext.length ) {

c = utftext.charCodeAt(i);

if (c < 128) {
string += String.fromCharCode(c);
i++;
}
else if((c > 191) && (c < 224)) {
c2 = utftext.charCodeAt(i+1);
string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
i += 2;
}
else {
c2 = utftext.charCodeAt(i+1);
c3 = utftext.charCodeAt(i+2);
string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
i += 3;
}

}

return string;
},

URLEncode : function (string) {
return escape(this._utf8_encode(string));
},

// public method for url decoding
URLDecode : function (string) {
return this._utf8_decode(unescape(string));
}
}

function run(strValue) {
document.frm.base64_encoded.value = Base64.encode(strValue);
document.frm.base64_decoded.value = Base64.decode(strValue);
document.frm.UTF8_encoded.value = Base64._utf8_encode(strValue);
document.frm.UTF8_decoded.value = Base64._utf8_decode(strValue);
document.frm.URL_encoded.value = Base64.URLEncode(strValue);
document.frm.URL_decoded.value = Base64.URLDecode(strValue);
}

function apply(strValue) {
document.frm.decoded.value = strValue;
run(document.frm.decoded.value);
}

</script>
</head>
<body>
<form name=frm action="">
문자입력
<br><textarea name="decoded" onkeyup="run(this.value);" rows=2 cols=80></textarea>
<p>
base64 encoded data (<a href="javascript:apply(document.frm.base64_encoded.value);">apply</a>);
<br><textarea name="base64_encoded" rows=2 cols=80"></textarea>
<p>
base64 decode data (<a href="javascript:apply(document.frm.base64_decoded.value);">apply</a>);
<br><textarea name="base64_decoded" rows=2 cols=80" ID="Textarea3"></textarea>
<p>
UTF-8 encoded data (<a href="javascript:apply(document.frm.UTF8_encoded.value);">apply</a>);
<br><textarea name="UTF8_encoded" rows=2 cols=80" ID="Textarea4"></textarea>
<p>
UTF-8 decoded data (<a href="javascript:apply(document.frm.UTF8_decoded.value);">apply</a>);
<br><textarea name="UTF8_decoded" rows=2 cols=80" ID="Textarea5"></textarea>
<p>

URL Encoded data (<a href="javascript:apply(document.frm.URL_encoded.value);">apply</a>);
<br><textarea name="URL_encoded" rows=2 cols=80" ID="Textarea1"></textarea>
<p>
URL Decoded data (<a href="javascript:apply(document.frm.URL_decoded.value);">apply</a>);
<br><textarea name="URL_decoded" rows=2 cols=80" ID="Textarea2"></textarea>
<p>
</form>
</body>
</html>


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