Implementation of JavaScript Base64 algorithm and Base64 encryption decryption in Java

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

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Implementation of JavaScript Base64 algorithm and Base64 encryption decryption in Java