java & javascript 自定义加密数据传输

再实际开发中可以能遇到不希望明文传输，简单加密处理的数据。可利用 亦或，并，且，等进行简单加密。

示例代码中使用的 ^ 运算 key = 0x01，可自定义自己的规则。定义自己的运算，保证可逆数据不丢失即可。 key 也可定义，动态key。

java 代码

public static String myEncode(String str) throws UnsupportedEncodingException {
        byte[] strBytes = str.getBytes("utf-8");
        byte[] newStrByte = new byte[strBytes.length];
        for (int i = 0; i < strBytes.length; i++) {
            newStrByte[i] = (byte) (strBytes[i] ^ 0x01);
        }
        return new String(newStrByte);
    }


String encodeStr = myEncode("IdmmnA\"547''+) ')%\"A ^*((!Vnsme");
        System.out.println(encodeStr);

javascript 代码

获取 utf-8 的byte

function toUTF8Array(str) {
    var utf8 = [];
    for (var i=0; i < str.length; i++) {
        var charcode = str.charCodeAt(i);
        if (charcode < 0x80) utf8.push(charcode);
        else if (charcode < 0x800) {
            utf8.push(0xc0 | (charcode >> 6), 
                      0x80 | (charcode & 0x3f));
        }
        else if (charcode < 0xd800 || charcode >= 0xe000) {
            utf8.push(0xe0 | (charcode >> 12), 
                      0x80 | ((charcode>>6) & 0x3f), 
                      0x80 | (charcode & 0x3f));
        }
        // surrogate pair
        else {
            i++;
            // UTF-16 encodes 0x10000-0x10FFFF by
            // subtracting 0x10000 and splitting the
            // 20 bits of 0x0-0xFFFFF into two halves
            charcode = 0x10000 + (((charcode & 0x3ff)<<10)
                      | (str.charCodeAt(i) & 0x3ff));
            utf8.push(0xf0 | (charcode >>18), 
                      0x80 | ((charcode>>12) & 0x3f), 
                      0x80 | ((charcode>>6) & 0x3f), 
                      0x80 | (charcode & 0x3f));
        }
    }
    return utf8;
}

获取byte并进行^计算

 bytes=stringToAsciiByteArray(str);
    for (var i = 0; i < bytes.length; i++) {

    	var newByte = (bytes[i]^0x01);
    	// newByte = (newByte^0x01);
    	console.log(String.fromCharCode(newByte));
    	encodeStr += String.fromCharCode(newByte);
    };
    console.log(encodeStr);