本文实例讲述了JS实现的base64加密、md5加密及sha1加密。分享给大家供大家参考，具体如下：
1、base64加密
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base64加密
2、md5加密
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md5加密
3、sha1加密
据说这是最安全的加密
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sha1加密
一下为js们的源代码
base64.js：
> 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,chr3;
var enc1,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;
}
}
MD5.js：
> 5] |= 0x80 << ((len) % 32);
x[(((len + 64) >>> 9) << 4) + 14] = len;
var a = 1732584193;
var b = -271733879;
var c = -1732584194;
var d = 271733878;
for(var i = 0; i < x.length; i += 16)
{
var olda = a;
var oldb = b;
var oldc = c;
var oldd = d;
a = md5_ff(a,b,c,d,x[i+ 0],7,-680876936);
d = md5_ff(d,a,x[i+ 1],12,-389564586);
c = md5_ff(c,x[i+ 2],17,606105819);
b = md5_ff(b,x[i+ 3],22,-1044525330);
a = md5_ff(a,x[i+ 4],-176418897);
d = md5_ff(d,x[i+ 5],1200080426);
c = md5_ff(c,x[i+ 6],-1473231341);
b = md5_ff(b,x[i+ 7],-45705983);
a = md5_ff(a,x[i+ 8],1770035416);
d = md5_ff(d,x[i+ 9],-1958414417);
c = md5_ff(c,x[i+10],-42063);
b = md5_ff(b,x[i+11],-1990404162);
a = md5_ff(a,x[i+12],1804603682);
d = md5_ff(d,x[i+13],-40341101);
c = md5_ff(c,x[i+14],-1502002290);
b = md5_ff(b,x[i+15],1236535329);
a = md5_gg(a,5,-165796510);
d = md5_gg(d,9,-1069501632);
c = md5_gg(c,14,643717713);
b = md5_gg(b,20,-373897302);
a = md5_gg(a,-701558691);
d = md5_gg(d,38016083);
c = md5_gg(c,-660478335);
b = md5_gg(b,-405537848);
a = md5_gg(a,568446438);
d = md5_gg(d,-1019803690);
c = md5_gg(c,-187363961);
b = md5_gg(b,1163531501);
a = md5_gg(a,-1444681467);
d = md5_gg(d,-51403784);
c = md5_gg(c,1735328473);
b = md5_gg(b,-1926607734);
a = md5_hh(a,4,-378558);
d = md5_hh(d,11,-2022574463);
c = md5_hh(c,16,1839030562);
b = md5_hh(b,23,-35309556);
a = md5_hh(a,-1530992060);
d = md5_hh(d,1272893353);
c = md5_hh(c,-155497632);
b = md5_hh(b,-1094730640);
a = md5_hh(a,681279174);
d = md5_hh(d,-358537222);
c = md5_hh(c,-722521979);
b = md5_hh(b,76029189);
a = md5_hh(a,-640364487);
d = md5_hh(d,-421815835);
c = md5_hh(c,530742520);
b = md5_hh(b,-995338651);
a = md5_ii(a,6,-198630844);
d = md5_ii(d,10,1126891415);
c = md5_ii(c,15,-1416354905);
b = md5_ii(b,21,-57434055);
a = md5_ii(a,1700485571);
d = md5_ii(d,-1894986606);
c = md5_ii(c,-1051523);
b = md5_ii(b,-2054922799);
a = md5_ii(a,1873313359);
d = md5_ii(d,-30611744);
c = md5_ii(c,-1560198380);
b = md5_ii(b,1309151649);
a = md5_ii(a,-145523070);
d = md5_ii(d,-1120210379);
c = md5_ii(c,718787259);
b = md5_ii(b,-343485551);
a = safe_add(a,olda);
b = safe_add(b,oldb);
c = safe_add(c,oldc);
d = safe_add(d,oldd);
}
return Array(a,d);
}
/*
* These functions implement the four basic operations the algorithm uses.
*/
function md5_cmn(q,x,s,t)
{
return safe_add(bit_rol(safe_add(safe_add(a,q),safe_add(x,t)),s),b);
}
function md5_ff(a,t)
{
return md5_cmn((b & c) | ((~b) & d),t);
}
function md5_gg(a,t)
{
return md5_cmn((b & d) | (c & (~d)),t);
}
function md5_hh(a,t)
{
return md5_cmn(b ^ c ^ d,t);
}
function md5_ii(a,t)
{
return md5_cmn(c ^ (b | (~d)),t);
}
/*
* Calculate the HMAC-MD5,of a key and some data
*/
function core_hmac_md5(key,data)
{
var bkey = str2binl(key);
if(bkey.length > 16) bkey = core_md5(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_md5(ipad.concat(str2binl(data)),512 + data.length * chrsz);
return core_md5(opad.concat(hash),512 + 128);
}
/*
* Add integers,wrapping at 2^32. This uses 16-bit operations internally
* to work around bugs in some JS interpreters.
*/
function safe_add(x,y)
{
var lsw = (x & 0xFFFF) + (y & 0xFFFF);
var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
return (msw << 16) | (lsw & 0xFFFF);
}
/*
* Bitwise rotate a 32-bit number to the left.
*/
function bit_rol(num,cnt)
{
return (num << cnt) | (num >>> (32 - cnt));
}
/*
* Convert a string to an array of little-endian words
* If chrsz is ASCII,characters >255 have their hi-byte silently ignored.
*/
function str2binl(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) << (i%32);
return bin;
}
/*
* Convert an array of little-endian words to a string
*/
function binl2str(bin)
{
var str = "";
var mask = (1 << chrsz) - 1;
for(var i = 0; i < bin.length * 32; i += chrsz)
str += String.fromCharCode((bin[i>>5] >>> (i % 32)) & mask);
return str;
}
/*
* Convert an array of little-endian words to a hex string.
*/
function binl2hex(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] >> ((i%4)*8+4)) & 0xF) +
hex_tab.charAt((binarray[i>>2] >> ((i%4)*8 )) & 0xF);
}
return str;
}
/*
* Convert an array of little-endian words to a base-64 string
*/
function binl2b64(binarray)
{
var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
var str = "";
for(var i = 0; i < binarray.length * 4; i += 3)
{
var triplet = (((binarray[i >> 2] >> 8 * ( i %4)) & 0xFF) << 16)
| (((binarray[i+1 >> 2] >> 8 * ((i+1)%4)) & 0xFF) << 8 )
| ((binarray[i+2 >> 2] >> 8 * ((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;
}
sha1.js：
> 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,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,e);
}
/*
* Perform the appropriate triplet combination function for the current
* iteration
*/
function sha1_ft(t,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;
}
/*
* Determine the appropriate additive constant for the current iteration
*/
function sha1_kt(t) {
return (t < 20) ? 1518500249 : (t < 40) ? 1859775393 : (t < 60) ? -1894007588 : -899497514;
}
/*
* Calculate the HMAC-SHA1 of a key and some data
*/
function core_hmac_sha1(key,data) {
var bkey = str2binb(key);
if (bkey.length > 16) bkey = core_sha1(bkey,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);
}
/*
* Add integers,y) {
var lsw = (x & 0xFFFF) + (y & 0xFFFF);
var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
return (msw << 16) | (lsw & 0xFFFF);
}
/*
* Bitwise rotate a 32-bit number to the left.
*/
function rol(num,cnt) {
return (num << cnt) | (num >>> (32 - cnt));
}
/*
* Convert an 8-bit or 16-bit string to an array of big-endian words
* In 8-bit function,characters >255 have their hi-byte silently ignored.
*/
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;
}
/*
* Convert an array of big-endian words to a string
*/
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;
}
/*
* Convert an array of big-endian words to a hex string.
*/
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;
}
/*
* Convert an array of big-endian words to a base-64 string
*/
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;
}
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