【转】JS前台加密,java后台解密实现
因项目需求,需要一些敏感信息进行加密,不能以明文暴露到浏览器。
然后后台进行解密操作 先看一下效果图
未对其加密传输
1.前台JS
- <script type="text/javascript">
- $(function() {
- $("#btn").click(function() {
- var username = encode64($("#username").val()); //对数据加密
- var password = encode64($("#password").val());
- $("#username").val(username);
- $("#password").val(password);
- document.fm.submit(); //fm为form表单name
- })
- })
- // base64加密开始
- 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;
- }
- // base64加密结束
- </script>
2、后台java代码
- private static char[] base64EncodeChars = new char[] { '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', '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, -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 };
- /**
- * 解密
- * @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))); // 使用decode()方法进行解密
MD5(Message Digest algorithm 5,信息摘要算法)
SHA(Secure Hash Algorithm,安全散列算法)
HMAC(Hash Message Authentication Code,散列消息鉴别码)
待有时间研究这些复杂的高级加密算法
作者:itmyhome
源码:download