大家好，又见面了，我是你们的朋友全栈君。
写在前面
写前端的时候，很多的时候是避免不了注册这一关的，但是一般的注册是没有任何的难度的，无非就是一些简单的获取用户输入的数据，然后进行简单的校验以后调用接口，将数据发送到后端，完成一个简单的注册的流程，那么一般来说，密码是不做加密的。但是也有一些数据库里面存放的是加密后的密码，这样有一个比较安全的地方在于，即使黑客将用户输入的文本密码得到了，也不知道具体是什么，因为密码是经过加密的。
今天就简单的将加密这块写一下，有可以用到的看一下。
js的加密没特别多的办法，常见的就三种， MD5加密、Base64加密和shal加密，那么今天就将这三种的用法写一下。
MD5加密
H5源码
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>md5加密</title>
<script src="js/jquery.min.js" type="text/javascript" charset="utf-8"></script>
<script src="js/md5.js" type="text/javascript" charset="utf-8"></script>
</head>
<body>
<input type="password" name="" id="md5" value="" />
<input type="button" name="" id="" value="MD5加密" onclick="testmd5()" />
</body>
<script type="text/javascript">
function testmd5(){
var password = $("#md5").val();
var md5password = $.md5(password);
console.log("没有加密之前的是："+password);
console.log("加密以后是："+md5password);
}
</script>
</html>
js源码
(function($){
var rotateLeft = function(lValue, iShiftBits) {
return (lValue << iShiftBits) | (lValue >>> (32 - iShiftBits));
}
var addUnsigned = function(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);
}
}
var F = function(x, y, z) {
return (x & y) | ((~ x) & z);
}
var G = function(x, y, z) {
return (x & z) | (y & (~ z));
}
var H = function(x, y, z) {
return (x ^ y ^ z);
}
var I = function(x, y, z) {
return (y ^ (x | (~ z)));
}
var FF = function(a, b, c, d, x, s, ac) {
a = addUnsigned(a, addUnsigned(addUnsigned(F(b, c, d), x), ac));
return addUnsigned(rotateLeft(a, s), b);
};
var GG = function(a, b, c, d, x, s, ac) {
a = addUnsigned(a, addUnsigned(addUnsigned(G(b, c, d), x), ac));
return addUnsigned(rotateLeft(a, s), b);
};
var HH = function(a, b, c, d, x, s, ac) {
a = addUnsigned(a, addUnsigned(addUnsigned(H(b, c, d), x), ac));
return addUnsigned(rotateLeft(a, s), b);
};
var II = function(a, b, c, d, x, s, ac) {
a = addUnsigned(a, addUnsigned(addUnsigned(I(b, c, d), x), ac));
return addUnsigned(rotateLeft(a, s), b);
};
var convertToWordArray = function(string) {
var lWordCount;
var lMessageLength = string.length;
var lNumberOfWordsTempOne = lMessageLength + 8;
var lNumberOfWordsTempTwo = (lNumberOfWordsTempOne - (lNumberOfWordsTempOne % 64)) / 64;
var lNumberOfWords = (lNumberOfWordsTempTwo + 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;
};
var wordToHex = function(lValue) {
var WordToHexValue = "", WordToHexValueTemp = "", lByte, lCount;
for (lCount = 0; lCount <= 3; lCount++) {
lByte = (lValue >>> (lCount * 8)) & 255;
WordToHexValueTemp = "0" + lByte.toString(16);
WordToHexValue = WordToHexValue + WordToHexValueTemp.substr(WordToHexValueTemp.length - 2, 2);
}
return WordToHexValue;
};
var uTF8Encode = function(string) {
string = string.replace(/\x0d\x0a/g, "\x0a");
var output = "";
for (var n = 0; n < string.length; n++) {
var c = string.charCodeAt(n);
if (c < 128) {
output += String.fromCharCode(c);
} else if ((c > 127) && (c < 2048)) {
output += String.fromCharCode((c >> 6) | 192);
output += String.fromCharCode((c & 63) | 128);
} else {
output += String.fromCharCode((c >> 12) | 224);
output += String.fromCharCode(((c >> 6) & 63) | 128);
output += String.fromCharCode((c & 63) | 128);
}
}
return output;
};
$.extend({
md5: function(string) {
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 tempValue = wordToHex(a) + wordToHex(b) + wordToHex(c) + wordToHex(d);
return tempValue.toLowerCase();
}
});
})(jQuery);效果
Base64加密
H5源码
ps：理论上这个不可以称为加密，这个只是将您的文本按照一定的编码格式重新写一遍罢了，但是可以起到一定的加密作用。
第一种写法
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>base64加密</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<script src="js/jquery.min.js" type="text/javascript" charset="utf-8"></script>
</head>
<body>
<input type="password" name="" id="basepass" value="" />
<input type="button" name="" id="" value="base加密" onclick="basefunc(1)"/>
<input type="button" name="" id="" value="base解密" onclick="basefunc(2)"/>
</body>
<script src="js/funcbase64.js" type="text/javascript" charset="utf-8"></script>
<script type="text/javascript">
function basefunc(e){
var password = $("#basepass").val();
var base = new Base64();
var encypass = base.encode(password);
var decryptpass = base.decode(encypass);
if(e == 1){
console.log("加密之前的密码是："+password);
console.log("加密之后的结果是："+encypass);
}
else if(e == 2){
console.log("解密之前的结果是："+encypass);
console.log("解密之后的结果是："+decryptpass);
}
}
</script>
</html>js源码
function Base64() {
// private property
_keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
// public method for encoding
this.encode = function (input) {
var output = "";
var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
var i = 0;
input = _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 +
_keyStr.charAt(enc1) + _keyStr.charAt(enc2) +
_keyStr.charAt(enc3) + _keyStr.charAt(enc4);
}
return output;
}
// public method for decoding
this.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 = _keyStr.indexOf(input.charAt(i++));
enc2 = _keyStr.indexOf(input.charAt(i++));
enc3 = _keyStr.indexOf(input.charAt(i++));
enc4 = _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 = _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;
}
} 第二种写法
H5源码
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>base64加密</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<script src="js/jquery.min.js" type="text/javascript" charset="utf-8"></script>
</head>
<body>
<input type="password" name="" id="basepass" value="" />
<input type="button" name="" id="" value="base加密" onclick="basefunc(1)"/>
<input type="button" name="" id="" value="base解密" onclick="basefunc(2)"/>
</body>
<script src="js/base64.js" type="text/javascript" charset="utf-8"></script>
<script type="text/javascript">
function basefunc(e){
var password = $("#basepass").val();
var encypass = Base64.encode(password);
var decryptpass = Base64.decode(encypass);
if(e == 1){
console.log("加密之前的密码是："+password);
console.log("加密之后的结果是："+encypass);
}
else if(e == 2){
console.log("解密之前的结果是："+encypass);
console.log("解密之后的结果是："+decryptpass);
}
}
</script>
</html>js源码
var Base64=
{
_keyStr:"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
encode:function(e){
var t="";
var n,r,i,s,o,u,a;
var f=0;
e=Base64._utf8_encode(e);
while(f<e.length){
n=e.charCodeAt(f++);
r=e.charCodeAt(f++);
i=e.charCodeAt(f++);
s=n>>2;
o=(n&3)<<4|r>>4;
u=(r&15)<<2|i>>6;
a=i&63;
if(isNaN(r)){
u=a=64
}else if(isNaN(i)){
a=64
}
t=t+this._keyStr.charAt(s)+this._keyStr.charAt(o)+this._keyStr.charAt(u)+this._keyStr.charAt(a)
}
return t
},
decode:function(e){
var t="";
var n,r,i;
var s,o,u,a;
var f=0;
e=e.replace(/[^A-Za-z0-9+/=]/g,"");
while(f<e.length){
s=this._keyStr.indexOf(e.charAt(f++));
o=this._keyStr.indexOf(e.charAt(f++));
u=this._keyStr.indexOf(e.charAt(f++));
a=this._keyStr.indexOf(e.charAt(f++));
n=s<<2|o>>4;
r=(o&15)<<4|u>>2;
i=(u&3)<<6|a;
t=t+String.fromCharCode(n);
if(u!=64){
t=t+String.fromCharCode(r)
}
if(a!=64){
t=t+String.fromCharCode(i)
}
}
t=Base64._utf8_decode(t);
return t
},
_utf8_encode:function(e){
e=e.replace(/rn/g,"n");
var t="";
for(var n=0;n<e.length;n++){
var r=e.charCodeAt(n);
if(r<128){
t+=String.fromCharCode(r)
}else if(r>127&&r<2048){
t+=String.fromCharCode(r>>6|192);
t+=String.fromCharCode(r&63|128)
}else{
t+=String.fromCharCode(r>>12|224);
t+=String.fromCharCode(r>>6&63|128);
t+=String.fromCharCode(r&63|128)
}
}
return t
},
_utf8_decode:function(e){
var t="";
var n=0;
var r=c1=c2=0;
while(n<e.length){
r=e.charCodeAt(n);
if(r<128){
t+=String.fromCharCode(r);
n++
}else if(r>191&&r<224){
c2=e.charCodeAt(n+1);
t+=String.fromCharCode((r&31)<<6|c2&63);
n+=2
}else{
c2=e.charCodeAt(n+1);
c3=e.charCodeAt(n+2);
t+=String.fromCharCode((r&15)<<12|(c2&63)<<6|c3&63);
n+=3
}
}
return t
}
}; 效果
sha1加密
H5源码
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>shal加密</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<script src="js/jquery.min.js" type="text/javascript" charset="utf-8"></script>
<script src="js/shal.js" type="text/javascript" charset="utf-8"></script>
</head>
<body>
<input type="password" name="" id="md5" value="" />
<input type="button" name="" id="" value="hex_sha1加密" onclick="testshal(1)" />
<input type="button" name="" id="" value="b64_sha1加密" onclick="testshal(2)" />
<input type="button" name="" id="" value="str_sha1加密" onclick="testshal(3)" />
</body>
<script type="text/javascript">
function testshal(e){
var password = $("#md5").val();
console.log("没有加密之前的是："+password);
if(e == 1){
var shalpassword = hex_sha1(password);
console.log("hex_sha1方式加密后是："+shalpassword);
}
else if(e == 2){
var shalpassword = b64_sha1(password);
console.log("b64_sha1方式加密后是："+shalpassword);
}
else if(e == 3){
var shalpassword = str_sha1(password);
console.log("str_sha1方式加密后是："+shalpassword);
}
}
</script>
</html>js源码
var hexcase = 0; /* 十六进制输出格式。0 -小写；1 -大写 */
var b64pad = ""; /* base- 64填充字符。“=”表示严格的RFC合规性 */
var chrsz = 8; /* 每个输入字符的位数。8 - ASCII；16 -统一码 */
function hex_sha1(s) {
return binb2hex(core_sha1(str2binb(s), s.length * chrsz));
}
function b64_sha1(s) {
return binb2b64(core_sha1(str2binb(s), s.length * chrsz));
}
function str_sha1(s) {
return binb2str(core_sha1(str2binb(s), s.length * chrsz));
}
function hex_hmac_sha1(key, data) {
return binb2hex(core_hmac_sha1(key, data));
}
function b64_hmac_sha1(key, data) {
return binb2b64(core_hmac_sha1(key, data));
}
function str_hmac_sha1(key, data) {
return binb2str(core_hmac_sha1(key, data));
}
function sha1_vm_test() {
return hex_sha1("abc") == "a9993e364706816aba3e25717850c26c9cd0d89d";
}
function core_sha1(x, len) {
x[len >> 5] |= 0x80 << (24 - len % 32);
x[((len + 64 >> 9) << 4) + 15] = len;
var w = Array(80);
var a = 1732584193;
var b = -271733879;
var c = -1732584194;
var d = 271733878;
var e = -1009589776;
for (var i = 0; i < x.length; i += 16) {
var olda = a;
var oldb = b;
var oldc = c;
var oldd = d;
var olde = e;
for (var j = 0; j < 80; j++) {
if (j < 16) w[j] = x[i + j];
else w[j] = rol(w[j - 3] ^ w[j - 8] ^ w[j - 14] ^ w[j - 16], 1);
var t = safe_add(safe_add(rol(a, 5), sha1_ft(j, b, c, d)), safe_add(safe_add(e, w[j]), sha1_kt(j)));
e = d;
d = c;
c = rol(b, 30);
b = a;
a = t;
}
a = safe_add(a, olda);
b = safe_add(b, oldb);
c = safe_add(c, oldc);
d = safe_add(d, oldd);
e = safe_add(e, olde);
}
return Array(a, b, c, d, e);
}
function sha1_ft(t, b, c, d) {
if (t < 20) return (b & c) | ((~b) & d);
if (t < 40) return b ^ c ^ d;
if (t < 60) return (b & c) | (b & d) | (c & d);
return b ^ c ^ d;
}
function sha1_kt(t) {
return (t < 20) ? 1518500249 : (t < 40) ? 1859775393 : (t < 60) ? -1894007588 : -899497514;
}
function core_hmac_sha1(key, data) {
var bkey = str2binb(key);
if (bkey.length > 16) bkey = core_sha1(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_sha1(ipad.concat(str2binb(data)), 512 + data.length * chrsz);
return core_sha1(opad.concat(hash), 512 + 160);
}
function safe_add(x, y) {
var lsw = (x & 0xFFFF) + (y & 0xFFFF);
var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
return (msw << 16) | (lsw & 0xFFFF);
}
function rol(num, cnt) {
return (num << cnt) | (num >>> (32 - cnt));
}
function str2binb(str) {
var bin = Array();
var mask = (1 << chrsz) - 1;
for (var i = 0; i < str.length * chrsz; i += chrsz)
bin[i >> 5] |= (str.charCodeAt(i / chrsz) & mask) << (24 - i % 32);
return bin;
}
function binb2str(bin) {
var str = "";
var mask = (1 << chrsz) - 1;
for (var i = 0; i < bin.length * 32; i += chrsz)
str += String.fromCharCode((bin[i >> 5] >>> (24 - i % 32)) & mask);
return str;
}
function binb2hex(binarray) {
var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
var str = "";
for (var i = 0; i < binarray.length * 4; i++) {
str += hex_tab.charAt((binarray[i >> 2] >> ((3 - i % 4) * 8 + 4)) & 0xF) + hex_tab.charAt((binarray[i >> 2] >> ((3 - i % 4) * 8)) & 0xF);
}
return str;
}
function binb2b64(binarray) {
var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
var str = "";
for (var i = 0; i < binarray.length * 4; i += 3) {
var triplet = (((binarray[i >> 2] >> 8 * (3 - i % 4)) & 0xFF) << 16) | (((binarray[i + 1 >> 2] >> 8 * (3 - (i + 1) % 4)) & 0xFF) << 8) | ((binarray[i + 2 >> 2] >> 8 * (3 - (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;
} 效果
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