JS前台加密,java后台解密实现

标签：加密   解密   base64   

因项目需求，需要对用户信息进行加密(以登录为例),前台js中对用户名密码进行加密传输。

然后后台进行解密操作 先看一下效果图

未对其加密传输

对其加密传输

从以上可以看出如果不对其进行加密的话，用户的一些敏感信息将会被捕捉到

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>

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();
}

作者：itmyhome

JS前台加密,java后台解密实现

标签：加密   解密   base64   

原文地址：http://blog.csdn.net/itmyhome1990/article/details/44860469