Compute HMAC-SHA512 with secret key in java
Also you can use a little wrapper by Apache Commons codec:
import static org.apache.commons.codec.digest.HmacAlgorithms.HMAC_SHA_512;
import org.apache.commons.codec.digest.HmacUtils;
public class HmacService {
private String sharedSecret;
public HmacService(String sharedSecret) {
this.sharedSecret = sharedSecret;
}
public String calculateHmac(String data) {
return new HmacUtils(HMAC_SHA_512, sharedSecret).hmacHex(data);
}
public boolean checkHmac(String data, String hmacHex) {
return calculateHmac(data).equals(hmacHex);
}
}
The simplest way can be -
private static final String HMAC_SHA512 = "HmacSHA512";
private static String toHexString(byte[] bytes) {
Formatter formatter = new Formatter();
for (byte b : bytes) {
formatter.format("%02x", b);
}
return formatter.toString();
}
public static String calculateHMAC(String data, String key)
throws SignatureException, NoSuchAlgorithmException, InvalidKeyException
{
SecretKeySpec secretKeySpec = new SecretKeySpec(key.getBytes(), HMAC_SHA512);
Mac mac = Mac.getInstance(HMAC_SHA512);
mac.init(secretKeySpec);
return toHexString(mac.doFinal(data.getBytes()));
}
public static void main(String[] args) throws Exception {
String hmac = calculateHMAC("data", "key");
System.out.println(hmac);
}
You can change the HMAC_SHA512 variable to any of the Mac algorithm and the code will work the same way.
Hope this helps:
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.io.UnsupportedEncodingException;
import java.nio.charset.StandardCharsets;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.util.Base64;
public class Test1 {
private static final String HMAC_SHA512 = "HmacSHA512";
public static void main(String[] args) {
Mac sha512Hmac;
String result;
final String key = "Welcome1";
try {
final byte[] byteKey = key.getBytes(StandardCharsets.UTF_8);
sha512Hmac = Mac.getInstance(HMAC_SHA512);
SecretKeySpec keySpec = new SecretKeySpec(byteKey, HMAC_SHA512);
sha512Hmac.init(keySpec);
byte[] macData = sha512Hmac.doFinal("My message".getBytes(StandardCharsets.UTF_8));
// Can either base64 encode or put it right into hex
result = Base64.getEncoder().encodeToString(macData);
//result = bytesToHex(macData);
} catch (UnsupportedEncodingException | InvalidKeyException | NoSuchAlgorithmException e) {
e.printStackTrace();
} finally {
// Put any cleanup here
System.out.println("Done");
}
}
}
For converting from byte array to hex refer this stackoverflow answer : here