Javascript front-end encryption, java backend decryption, and JS front-end encryption

Javascript front-end encryption, java backend decryption, and JS front-end encryption

Due to project requirements, user information needs to be encrypted (take logon as an example), and username and password are encrypted in front-end js for transmission.

Then perform decryption in the background first.

It is not encrypted for Transmission

Encrypted transmission

We can see from the above that if you do not encrypt it, some of the user's sensitive information will be captured.

1. Front-end JS

<Script type = "text/javascript"> $ (function () {$ ("# btn "). click (function () {var username = encode64 ($ ("# username "). val (); // encrypt the data var password = encode64 ($ ("# password "). val (); $ ("# username "). val (username); $ ("# password "). val (password); document. fm. submit (); // fm is form name })}) // start var keyStr = "ABCDEFGHIJKLMNOP" + "QRSTUVWXYZabcdef" + "ghijklmnopqrstuv" + "wxyz0123456789 +/" + "="; 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 & 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) + keyStr. charAt (enc4); chr1 = chr2 = chr3 = ""; enc1 = enc2 = enc3 = enc4 = "";} while (I <input. length); return output;} // end of base64 encryption </script>

2. Background java code

Private static char [] base64EncodeChars = new char [] {'A', 'B', 'C', 'D', 'E', 'E', 'F', 'G ', 'H', 'I', 'J', 'k', 'l', 'M', 'n', 'O', 'P', 'Q ', 'R', 's', 't', 'U', 'V', 'w', 'x', 'y', 'z', 'A ', 'B', 'C', 'D', 'E', 'F', 'G', 'h', 'I', 'J', 'k ', 'l', 'M', 'n', 'O', 'P', 'Q', 'R', 's', 't', 'U ', 'V', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4 ', '5', '6', '7', '8', '9', '+ ','/',}; private static byte [] base64DecodeChars = new byte [] {-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, 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};/*** decrypt * @ param str * @ return */public static byte [] decode (String str) {byte [] data = str. getBytes (); int len = data. length; ByteArrayOutputStream buf = new ByteArrayOutputStream (len); int I = 0; int b1, b2, b3, b4; while (I <len) {do {b1 = base64DecodeChars [data [I ++];} while (I <len & b1 =-1); if (b1 =-1) {break;} do {b2 = base64DecodeChars [data [I ++];} while (I <len & b2 =-1 ); if (b2 =-1) {break;} buf. write (int) (b1 <2) | (b2 & 0x30) >>> 4); do {b3 = data [I ++]; if (b3 = 61) {return buf. toByteArray ();} b3 = base64DecodeChars [b3];} while (I <len & b3 =-1); if (b3 =-1) {break ;} buf. write (int) (b2 & 0x0f) <4) | (b3 & 0x3c) >>> 2 ))); do {b4 = data [I ++]; if (b4 = 61) {return buf. toByteArray ();} b4 = base64DecodeChars [b4];} while (I <len & b4 =-1); if (b4 =-1) {break ;} buf. write (int) (b3 & 0x03) <6) | b4);} return buf. toByteArray ();}

System. out. println (new String (decode (username); // use the decode () method for decryption

Author: itmyhome