共计 2571 个字符,预计需要花费 7 分钟才能阅读完成。
前端最罕用的两种加密形式举荐
1.Base64 加密
base64 是最常见的加密,99.99% 的人都据说过。
var Base64 = {_keyStr: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=", encode: function (input) {
var output = "";
var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
var i = 0;
input = (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;
})(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;
}, 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 = (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;
})(output);
return output;
}
}
2.Rc4 加密
var rc4 = (data, pwd) => {var seq = Array(256);
var das = Array(data.length);
for (var i = 0; i < 256; i++) {seq[i] = i;
var j = (j + seq[i] + pwd.charCodeAt(i % pwd.length)) % 256;
var temp = seq[i];
seq[i] = seq[j];
seq[j] = temp;
}
for (var i = 0; i < data.length; i++) {das[i] = data.charCodeAt(i)
}
for (var x = 0; x < das.length; x++) {var i = (i + 1) % 256;
var j = (j + seq[i]) % 256;
var temp = seq[i];
seq[i] = seq[j];
seq[j] = temp;
var k = (seq[i] + (seq[j] % 256)) % 256;
das[x] = String.fromCharCode(das[x] ^ seq[k]);
}
return das.join('');
}
// 加密
var encodeStr = rc4('hello js 一键解密 jsjiami.com','123456');
// 解密
var decodeStr = rc4(str, '123456');
正文完