Implementation of JavaScript Base64 algorithm and Base64 encryption decryption in Java

Source: Internet
Author: User
Tags base64 decrypt

Some time ago, work needs, need to use JS and Java matching base64 algorithm, but did not find, and then online copy a set. It is still very effective to use.

Gossip less flocculation, directly on dry.

JS version Base 64 algorithm Base64.js

var keystr =  "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz0123456789+/=";// The ANSI-encoded string is BASE64 encoded function encode64 (input)  {var output =  "";var chr1,  chr2, chr3 =  "";var enc1, enc2, enc3, enc4 =  ""; var i =  0;do {chr1 = input.charcodeat (i++); Chr2 = input.charcodeat (i++); chr3 =  input.charcodeat (i++);enc1 = chr1 >> 2;enc2 =  ((chr1 &  3)  << 4)  |  (chr2 >> 4);enc3 =  ((chr2 & &NBSP;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) &NBSP;+&NBsp;keystr.charat (ENC4);chr1 = chr2 = chr3 =  ""; enc1 = enc2 =  enc3 = enc4 =  "";}  while  (i < input.length); return output;} Converts an BASE64 encoded string into an ANSI-encoded string function decode64 (input)  {var output =  ""; Var chr1,  chr2, chr3 =  ";var enc1, enc2, enc3, enc4 = "; var i  = 0;if  (input.length % 4 != 0)  {return  "";} var base64test = /[^a-za-z0-9\+\/\=]/g;if  (base64test.exec (input))  {return  "";} Do {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  &AMP;&NBSP;15)  << 4)  |  (ENC3&NBSP;&GT;&GT;&NBSP;2);chr3 =  ((enc3 & 3)  << 6)  |  enc4;output = output + string.fromcharcode (CHR1);if  (enc3 != 64)  {output += string.fromcharcode (CHR2);} if  (enc4 != 64)  {output += string.fromcharcode (CHR3);} chr1 = chr2 = chr3 =  ""; enc1 = enc2 = enc3 = enc4  =  "";}  while  (i < input.length); return output;} Function utf16to8 (str)  {  var out, i, len, c;  out =   "";   len = str.length;  for (i = 0; i < len;  i++)  {    c = str.charcodeat (i);    if  ((c  >= 0x0001)  &&  (c <= 0x007f)  {       out +=&nbsP;str.charat (i);    } else if  (c > 0x07ff)  {       out += string.fromcharcode (0xe0 |  (c >> 12)   & 0x0f));       out += string.fromcharcode (0x80 |  ( c >>  6) ( & 0x3f));      out +=  String.fromCharCode (0x80 |  ((c >>  0)  & 0x3f));     } else {      out += string.fromcharcode (0xC0 |   ((c >>  6)  & 0x1f);       out +=  string.fromcharcode (0x80 |  ((c >>  0)  & 0x3f));     }  }  return out;} Function utf8to16 (str)  {  var out, i, len, c;  var char2, char3;  out =  "";  len =  Str.length;  i = 0;  while (I < len)  {    c  = str.charcodeat (i++);     switch (c >> 4)  {       case 0: case 1: case 2: case 3: case 4:  case 5: case 6: case 7:        //  0xxxxxxx        out += str.charat (i-1);         break;      case 12: case 13:         // 110x xxxx   10xx xxxx         char2 = str.charcodeat (i++);         out += string.fromcharcode ((c & 0x1f)  << 6)  |  (char2 &  0x3F));         break;      case 14:         // 1110 xxxx  10xx xxxx   10xx xxxx        char2 = str.charcodeat (i++);         char3 = str.charcodeat (i++);         out += string.fromcharcode ((c & 0x0f)  << 12)  |          ((char2 & 0x3f)  << 6)  |          ((char3 & 0x3f)  << 0);         break;    }  }  return  Out;}



Examples of parsing in JS:

Encryption

var testcode= "test88"; var resultcode= encode64 (Utf16to8 (Testcode)); Console.log (ResultCode);

Output

DGVzdDg4

Decrypt

var testcode= "DGVzdDg4"; resultcode= utf8to16 (Decode64 (Testcode)); Console.log (ResultCode);

Output

Test88


Parsing the base64 encoding in Java:

Encryption

String localstr= "test88";          String resultstr =base64.getencoder (). Encodetostring (Localstr.getbytes ()); System.out.println (RESULTSTR);

Output

DGVzdDg4

Decrypt

String teststr= "DGVzdDg4";          String Testresult=new string (Base64.getdecoder (). Decode (TESTSTR)); System.out.println (TestResult);

Output

Test88

Attached base64.js for base64 encryption decrypted JS component, test.html for the test file in JS Test.java as a test file in Java

This article is from "Your father's shawl Hair" blog, please be sure to keep this source http://nimalegebi.blog.51cto.com/5614287/1828160

Implementation of JavaScript Base64 algorithm and Base64 encryption decryption in Java

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