JavaScript Base64加解密
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互联网集市收集整理的这篇技术教程文章主要介绍了JavaScript Base64加解密，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含4138字，纯文字阅读大概需要6分钟。
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Base64加密算法是网络上最常见的用于传输8Bit字节代码的编码方式之一，大家可以查看RFC2045～RFC2049，上面有MIME的详细规范。Base64编码可用于在HTTP环境下传递较长的标识信息。例如，在Java Persistence系统Hibernate中，就采用了Base64来将一个较长的唯一标识符（一般为128-bit的UUID）编码为一个字符串，用作HTTP表单和HTTP GET URL中的参数。在其他应用程序中，也常常需要把二进制数据编码为适合放在URL（包括隐藏表单域）中的形式。此时，采用Base64编码具有不可读性，即所编码的数据不会被人用肉眼所直接看到。
下面是Base64加密、解密算法的简单实现(不支持中文)：
function
base64Encrypt(baseString) {
var base64Chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
var length = baseString.length;
var loopNo = parseInt(length / 3);
var charOne, charTwo, charThree;
var out = "";
for (var i = 0, j = 0; j < loopNo; j++) {
charOne = baseString.charCodeAt(i++);
charTwo = baseString.charCodeAt(i++);
charThree = baseString.charCodeAt(i++);
out += base64Chars.charAt(charOne >> 2);
out += base64Chars.charAt(((charOne & 0x3) << 4) | ((charTwo & 0xF0) >> 4));
out += base64Chars.charAt(((charTwo & 0xF) << 2) | ((charThree & 0xC0) >> 6));
out += base64Chars.charAt(charThree & 0x3F);
}
if (i === length) {
return out;
}
charOne = baseString.charCodeAt(i++) & 0xff;
out += base64Chars.charAt(charOne >> 2);
if (i === length) {
out += base64Chars.charAt((charOne & 0x3) << 4);
out += "==";
} else {
charTwo = baseString.charCodeAt(i++);
out += base64Chars.charAt(((charOne & 0x3) << 4) | ((charTwo & 0xF0) >> 4));
out += base64Chars.charAt((charTwo & 0xF) << 2);
out += "=";
}
return out;
}
function base64Encode(baseSting) {
var base64Chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
var length = baseSting.length;
var chara1, chara2, chara3;
var out = "", i = 0;
while (i < length) {
chara1 = baseSting.charCodeAt(i++) & 0xff;
out += base64Chars.charAt(chara1 >> 2);
if (i == length) {
out += base64Chars.charAt((chara1 & 0x3) << 4);
out += "==";
break;
}
chara2 = baseSting.charCodeAt(i++);
if (i == length) {
out += base64Chars.charAt(((chara1 & 0x3) << 4) | ((chara2 & 0xF0) >> 4));
out += base64Chars.charAt((chara2 & 0xF) << 2);
out += "=";
break;
}
chara3 = baseSting.charCodeAt(i++);
out += base64Chars.charAt(((chara1 & 0x3) << 4) | ((chara2 & 0xF0) >> 4));
out += base64Chars.charAt(((chara2 & 0xF) << 2) | ((chara3 & 0xC0) >> 6));
out += base64Chars.charAt(chara3 & 0x3F);
}
return out;
}
function base64Decode(baseString) {
var base64Chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
var length = baseString.length;
var charI, charII, charIII, charIV;
var out = "", i = 0;
if (0 < length && 0 === length % 4) {
if (/^[A-Za-z0-9\+/]{2,}={0,2}$/.test(baseString)) {
while (i < length - 4) {
charI = base64Chars.indexOf(baseString.charAt(i++));
charII = base64Chars.indexOf(baseString.charAt(i++));
charIII = base64Chars.indexOf(baseString.charAt(i++));
charIV = base64Chars.indexOf(baseString.charAt(i++));
out += String.fromCharCode((charI << 2) | ((charII & 0x30) >> 4));
out += String.fromCharCode(((charII & 0xF) << 4) | ((charIII & 0x3C) >> 2));
out += String.fromCharCode(((charIII & 0x3) << 6) | charIV);
}
charI = base64Chars.indexOf(baseString.charAt(i++));
charII = base64Chars.indexOf(baseString.charAt(i++));
out += String.fromCharCode((charI << 2) | ((charII & 0x30) >> 4));
switch (baseString.indexOf("=")) {
case length - 1:
charIII = base64Chars.indexOf(baseString.charAt(i++));
out += String.fromCharCode(((charII & 0xF) << 4) | ((charIII & 0x3C) >> 2));
break;
case -1:
charIII = base64Chars.indexOf(baseString.charAt(i++));
charIV = base64Chars.indexOf(baseString.charAt(i++));
out += String.fromCharCode(((charII & 0xF) << 4) | ((charIII & 0x3C) >> 2));
out += String.fromCharCode(((charIII & 0x3) << 6) | charIV);
}
} else {
thrownew Error(baseString + " does not base64 encoded string.");
}
} else {
thrownew Error(baseString + " does not base64 encoded string.");
}
return out;
}
原文：http://www.cnblogs.com/julygift/p/7235697.html
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