js 加密、解密算法类库

有些功能需要前端进行加密解密，就会用到这些库

crypto-js 是一个纯 javascript 写的加密算法类库 ，可以非常方便地在 javascript 进行 MD5、SHA1、SHA2、SHA3、RIPEMD-160 哈希散列（不可解密），进行 AES、DES、Rabbit、RC4、Triple DES 加解密。

var CryptoJS = require("crypto-js");
var key = 'esage'
//crypto-js 是一个纯 javascript 写的加密算法类库 ，可以非常方便地在 javascript 进行 MD5、SHA1、SHA2、SHA3、RIPEMD-160 哈希散列，进行 AES、DES、Rabbit、RC4、Triple DES 加解密。

// Encrypt 加密方法 key密钥
export function encrypter(str = '', secret = key) {
return CryptoJS.AES.encrypt(str.toString(), secret)
}

// Decrypt 解密方法
export function decrypter(str = '', secret = key) {
let bytes = CryptoJS.AES.decrypt(str.toString(), secret);
return bytes.toString(CryptoJS.enc.Utf8)
}

//md5加密
export function md5Hash(str){
return CryptoJS.MD5(str).toString();
}

js实现base64的加密解密

/**
*
* Base64 encode / decode
* http://www.webtoolkit.info/
*
**/
var Base64 = {
_keyStr: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
encode: function (input) {
var output = "";
var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
var i = 0;

input = Base64.utf8Encode(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;

},

// privateNetwork method for UTF-8 encoding
utf8Encode: 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;
},

// privateNetwork method for UTF-8 decoding
utf8Decode: 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;
}

};

export default Base64;