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Complete example of base64 encryption and decryption implemented by JS, and jsbase64 encryption and decryption
This article describes the base64 encryption and decryption implemented by JS. We will share this with you for your reference. The details are as follows:
Complete code:
<HTML> <HEAD> <TITLE> Base64 </TITLE> <script language = javascript> var base64EncodeChars = "encoding +/"; var base64DecodeChars = new Array (-1, -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1, 62,-1,-1,-1, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61,-1,-1,-1,-1,-1,-1,-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,-1, -1,-1,-1,-1,-1,-1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,-1,-1,-1,-1, -1); <HTML> <HEAD> <TITLE> Base64 </TITLE> <script language = JavaScript> var base64EncodeChars = "signature ++ /"; var base64DecodeChars = new Array (-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1, 62,-1,-1,-1, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61,-1,-1,-1,-1,-1,-1,-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,-1,-1,-1,-1,-1,-1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,-1, -1,-1,-1,-1); function base64encode (str) {var out, I, len; var c1, c2, c3; len = str. length; I = 0; out = ""; while (I <len) {c1 = str. charCodeAt (I ++) & 0xff; if (I = len) {out + = base64EncodeChars. charAt (c1> 2); out + = base64EncodeChars. charAt (c1 & 0x3) <4); out + = "="; break;} c2 = str. charCodeAt (I ++); if (I = len) {out + = base64EncodeChars. charAt (c1> 2); out + = base64EncodeChars. charAt (c1 & 0x3) <4) | (c2 & 0xF0)> 4); out + = base64EncodeChars. charAt (c2 & 0xF) <2); out + = "="; break;} c3 = str. charCodeAt (I ++); out + = base64EncodeChars. charAt (c1> 2); out + = base64EncodeChars. charAt (c1 & 0x3) <4) | (c2 & 0xF0)> 4); out + = base64EncodeChars. charAt (c2 & 0xF) <2) | (c3 & 0xC0)> 6); out + = base64EncodeChars. charAt (c3 & 0x3F);} return out;} function base64decode (str) {var c1, c2, c3, c4; var I, len, out; len = str. length; I = 0; out = ""; while (I <len) {/* c1 */do {c1 = base64DecodeChars [str. charCodeAt (I ++) & 0xff];} while (I <len & c1 =-1); if (c1 =-1) break; /* c2 */do {c2 = base64DecodeChars [str. charCodeAt (I ++) & 0xff];} while (I <len & c2 =-1); if (c2 =-1) break; out + = String. fromCharCode (c1 <2) | (c2 & 0x30)> 4);/* c3 */do {c3 = str. charCodeAt (I ++) & 0xff; if (c3 = 61) return out; c3 = base64DecodeChars [c3];} while (I <len & c3 =-1); if (c3 =-1) break; out + = String. fromCharCode (c2 & 0XF) <4) | (c3 & 0x3C)> 2);/* c4 */do {c4 = str. charCodeAt (I ++) & 0xff; if (c4 = 61) return out; c4 = base64DecodeChars [c4];} while (I <len & c4 =-1); if (c4 =-1) break; out + = String. fromCharCode (c3 & 0x03) <6) | c4) ;}return out;} 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 + = 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: // 0 xxxxxxx 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;} function doit () {var f = document. f. output. value = base64encode (utf16to8 (f. source. value) f. decode. value = utf8to16 (base64decode (f. output. value ))} </script> </HEAD> <BODY> <H1> Base64 </H1> <form name = "f"> source Code <BR> <textarea name = "source" ROWS = 4 COLS = 60 WRAP = "soft"> </TEXTAREA> <BR> Base64 encode <BR> <textarea name = "output" ROWS = 4 COLS = 60 WRAP = "soft"> </TEXTAREA> <BR> Base64 decode <BR> <textarea name = "decode" ROWS = 4 COLS = 60 WRAP = "soft"> </ TEXTAREA> <BR> <input type = button value = "convert" ONCLICK = "doit () "> </FORM> </BODY>
For more information about base64 encryption and decryption, see the online tools on this site.:
BASE64 encoding and decoding tool
For more information about encryption and decryption, see:
MD5 online encryption tool
URL hexadecimal encryption tool
Thunder, express, and Tornado URL encryption/Decryption tools
Online SHA1 encryption tool
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