<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>www.jb51.net aes.js</title>

</head>

<body>

<script>

  // Create Base64 Objectvar

  Base64 = {

  _keyStr: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",

  encode: function (e) {

    var t = "";

    var n, r, i, s, o, u, a;

    var f = ;

    e = Base64._utf8_encode(e);

    while (f < e.length) {

      n = e.charCodeAt(f++);

      r = e.charCodeAt(f++);

      i = e.charCodeAt(f++);

      s = n >> ;

      o = (n & ) <<  | r >> ;

      u = (r & ) <<  | i >> ;

      a = i & ;

      if (isNaN(r)) {

        u = a =

      } else if (isNaN(i)) {

        a =

      }

      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 = ;

    e = e.replace(/[^A-Za-z0-+/=]/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 <<  | o >> ;

      r = (o & ) <<  | u >> ;

      i = (u & ) <<  | a;

      t = t + String.fromCharCode(n);

      if (u != ) {

        t = t + String.fromCharCode(r)

      }

      if (a != ) {

        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 = ; n < e.length; n++) {

      var r = e.charCodeAt(n);

      if (r < ) {

        t += String.fromCharCode(r)

      } else if (r >  && r < ) {

        t += String.fromCharCode(r >>  | );

        t += String.fromCharCode(r &  | )

      } else {

        t += String.fromCharCode(r >>  | );

        t += String.fromCharCode(r >>  &  | );

        t += String.fromCharCode(r &  | )

      }

    }

    return t

  }, _utf8_decode: function (e) {

    var t = "";

    var n = ;

    var r = c1 = c2 = ;

    while (n < e.length) {

      r = e.charCodeAt(n);

      if (r < ) {

        t += String.fromCharCode(r);

        n++

      } else if (r >  && r < ) {

        c2 = e.charCodeAt(n + );

        t += String.fromCharCode((r & ) <<  | c2 & );

        n +=

      } else {

        c2 = e.charCodeAt(n + );

        c3 = e.charCodeAt(n + );

        t += String.fromCharCode((r & ) <<  | (c2 & ) <<  | c3 & );

        n +=

      }

    }

    return t

  }

}

// Define the string

var string = 'Hello World!';

// Encode the String

var encodedString = Base64.encode(string);

console.log(encodedString); // Outputs: "SGVsbG8gV29ybGQh"

// Decode the String

var decodedString = Base64.decode(encodedString);

console.log(decodedString); // Outputs: "Hello World!"

//这个自定义的Base64对象可以转码的字符也不仅限于Latin1字符;

var string = "Hello, ccccc！";

var encodedString = Base64.encode(string);//"SGVsbG8sIOS4reWbve+8gQ=="

console.log(encodedString);

var decodedString = Base64.decode(encodedString);

console.log(decodedString);

console.log("hahahhaha");

</script>

</body>

</html>

使用python解密

>>> import base64

>>> base64.b64decode("SGVsbG8sIGNjY2Nj77yB").decode()

'Hello, ccccc！'

>>> base64.b64decode("SGVsbG8sIGNjY2Nj77yB").decode("utf-8")

'Hello, ccccc！'

参考：

https://www.cnblogs.com/songzhixue/p/11253243.html

https://www.cnblogs.com/chenglee/p/9037265.html

https://www.cnblogs.com/sunyuweb/p/9092367.html

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