Generate Fingerprint For AuthorizeNet using Java

import java.security.InvalidKeyException;

import java.security.NoSuchAlgorithmException;

import java.util.Random;

import javax.crypto.Mac;

import javax.crypto.SecretKey;

import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Hex;

import org.apache.log4j.Logger;

public class GenerateFingerprint {

private static final Logger logger = Logger.getLogger(GenerateFingerprint.class);

public static void main(String[] args) {

// provided by authorize.net

String transactionKey = "{transactionkey}";

// provided by authorize.net

String apiLoginId = "{apiloginid}";

String amount = "20";

// currency Code

String currencyCode = "USD";

try {

// generate timestamp in sequence number

long timeStamp = System.currentTimeMillis() / 1000;

// generate random sequence number

Random random = new Random();

long loginSequence = random.nextInt(100000000);

// section use java Cryptography functions to generate a fingerprint

// convert transaction key to Secret key object

SecretKey key = new SecretKeySpec(transactionKey.getBytes(), "HmacMD5");

// create a MAC object to generate the fingerprint using the HmacMD5 algorithm

Mac mac = Mac.getInstance("HmacMD5");

mac.init(key);

// add caret(^) between input values as per documented by authorizenet

String inputString = apiLoginId + "^" + loginSequence + "^" + timeStamp + "^" + amount + "^" + currencyCode;

// get String as bytes

byte[] inputBytes= inputString.getBytes();

// create digest from byte array

byte[] result = mac.doFinal(inputBytes);

// convert HMAC byte array to char array.

char[] resultCharArray = Hex.encodeHex(result);

// convert char array to string

String fingerprint = new String(resultCharArray);

logger.info("Login Sequence :: " + loginSequence);

logger.info("TimeStamp :: " + timeStamp);

logger.info("-----------------------------------------------");

logger.info("Fingerprint :: " + fingerprint);

logger.info("-----------------------------------------------");

 

} catch (NoSuchAlgorithmException e) {

e.printStackTrace();

} catch (InvalidKeyException e) {

e.printStackTrace();

}

}

}