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Forked from ishikawa/gist:88599
Created November 22, 2016 05:24
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Java Sample Code for Calculating HMAC-SHA1 Signatures
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SignatureException;
import java.util.Formatter;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
/**
* The <tt>HmacSha1Signature</tt> shows how to calculate
* a message authentication code using HMAC-SHA1 algorithm.
*
* <pre>
* % java -version
* java version "1.6.0_11"
* % javac HmacSha1Signature.java
* % java -ea HmacSha1Signature
* 104152c5bfdca07bc633eebd46199f0255c9f49d
* </pre>
*
*/
public class HmacSha1Signature {
private static final String HMAC_SHA1_ALGORITHM = "HmacSHA1";
private static String toHexString(byte[] bytes) {
Formatter formatter = new Formatter();
for (byte b : bytes) {
formatter.format("%02x", b);
}
return formatter.toString();
}
public static String calculateRFC2104HMAC(String data, String key)
throws SignatureException, NoSuchAlgorithmException, InvalidKeyException
{
SecretKeySpec signingKey = new SecretKeySpec(key.getBytes(), HMAC_SHA1_ALGORITHM);
Mac mac = Mac.getInstance(HMAC_SHA1_ALGORITHM);
mac.init(signingKey);
return toHexString(mac.doFinal(data.getBytes()));
}
public static void main(String[] args) throws Exception {
String hmac = calculateRFC2104HMAC("data", "key");
System.out.println(hmac);
assert hmac.equals("104152c5bfdca07bc633eebd46199f0255c9f49d");
}
}
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