Question

我真的很努力地在Java和节点之间进行十六进制到字节的转换。 Java方法有效。我需要在两种语言之间创建相同的HMAC SHa1哈希。

我使用hexToBytes函数的结果作为生成HmacSHA1哈希的键。使用转换后的密钥时，哈希值是不同的。

为什么字节值不累加？ Java为什么会产生负整数？

Java：

private static byte[] hexToBytes(String hexValue) throws Exception {
    String hb = "";
    if ((hexValue.length() % 2) != 0) {
        throw new Exception("Odd length on HEX " + hexValue + "");
    }
    byte[] value = new byte[(hexValue.length() / 2)];
    try {
        for (int i = 0; i < value.length; i++) {
            hb = hexValue.substring(2 * i, (2 * i) + 2);
            value[i] = (byte) (Integer.parseInt(hb, 16) & 0xff);
            System.out.println("Loop: "+i+"  HB: "+hb+" => "+value[i]);

        }
    } catch (NumberFormatException nfe) {
        throw new Exception("Invalid HEX <" + hb + "> in string <" + hexValue + ">");
    }
    System.out.println("FINAL => "+value.toString());

    String s = new String(value);
    System.out.println("In string : " + s);
    System.out.println(value);
    String hex = bytesToHex(value);
    System.out.println("Back TO HEX: "+hex);
    return value;
}

hexToBytes（“ 0123456789ABCDEFFEDCBA9876666666”）;

Loop: 0  HB: 01 => 1
Loop: 1  HB: 23 => 35
Loop: 2  HB: 45 => 69
Loop: 3  HB: 67 => 103
Loop: 4  HB: 89 => -119
Loop: 5  HB: AB => -85
Loop: 6  HB: CD => -51
Loop: 7  HB: EF => -17
Loop: 8  HB: FE => -2
Loop: 9  HB: DC => -36
Loop: 10  HB: BA => -70
Loop: 11  HB: 98 => -104
Loop: 12  HB: 76 => 118
Loop: 13  HB: 66 => 102
Loop: 14  HB: 66 => 102
Loop: 15  HB: 66 => 102
FINAL => [B@3214ee6
In string : #Eg?«?ï?Üº?vfff
[B@3214ee6
Back TO HEX: 0123456789abcdeffedcba9876666666

这是我内置在Node中的简单函数。

async function hexToBytes (hexValue){

    var bytes3 = Buffer.alloc(hexValue.length / 2, 'hex');

    for (var bytes = new Array(), c = 0; c < bytes3.length; c ++){
        var v = hexValue.substr(2*c, 2);
        var t = parseInt("0x"+v, 16 & 0xFF);
        console.log('Index: '+c+' V: '+v+' => '+t );
        bytes[c] = t;
        //bytes.push(t);

    }

    console.log('Back to HEX')
    console.log(Buffer(bytes,'hex').toString('hex').toUpperCase());

    return Buffer(bytes, 'utf8');
}

Node JS中hexToBytes（“ 0123456789ABCDEFFEDCBA9876666666”）的输出；

Length of SCERET :16
Index: 0 V: 01 => 1
Index: 1 V: 23 => 35
Index: 2 V: 45 => 69
Index: 3 V: 67 => 103
Index: 4 V: 89 => 137
Index: 5 V: AB => 171
Index: 6 V: CD => 205
Index: 7 V: EF => 239
Index: 8 V: FE => 254
Index: 9 V: DC => 220
Index: 10 V: BA => 186
Index: 11 V: 98 => 152
Index: 12 V: 76 => 118
Index: 13 V: 66 => 102
Index: 14 V: 66 => 102
Index: 15 V: 66 => 102
Back to HEX
0123456789ABCDEFFEDCBA9876666666
#Eg�����ܺ�vT2

在Java和Node之间将十六进制转换为字节（Javascript）

0 个答案: