java hash_hmac

Posted 2023-02-20 yc..

 public static String getSignature(String data, String key) throws Exception 
        byte[] keyBytes = key.getBytes();
        SecretKeySpec signingKey = new SecretKeySpec(keyBytes, MAC_NAME);
        Mac mac = Mac.getInstance(MAC_NAME);
        mac.init(signingKey);
        byte[] rawHmac = mac.doFinal(data.getBytes());
        StringBuilder sb = new StringBuilder();
        for (byte b : rawHmac) 
            sb.append(byteToHexString(b));
        
        return sb.toString();
    

    private static String byteToHexString(byte ib) 
        char[] Digit = '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f';
        char[] ob = new char[2];
        ob[0] = Digit[(ib >>> 4) & 0X0f];
        ob[1] = Digit[ib & 0X0F];
        return new String(ob);