import java.security.SignatureException;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
/** * This class defines common routines for generating authentication signatures * for AWS requests. */
public class Signature {
private static final String HMAC_SHA1_ALGORITHM = "HmacSHA1";
/** * Computes RFC 2104-compliant HMAC signature. * @param data The data to be * signed. * * @param key * The signing key. * @return The Base64-encoded RFC 2104-compliant HMAC signature. * @throws java.security.SignatureException * when signature generation fails */
public static String calculateRFC2104HMAC(String data, String key)
throws java.security.SignatureException {
String result;
try {
// get an hmac_sha1 key from the raw key bytes
SecretKeySpec signingKey = new SecretKeySpec(key.getBytes(),
HMAC_SHA1_ALGORITHM);
// get an hmac_sha1 Mac instance and initialize with the signing key
Mac mac = Mac.getInstance(HMAC_SHA1_ALGORITHM);
mac.init(signingKey);
// compute the hmac on input data bytes
byte[] rawHmac = mac.doFinal(data.getBytes());
// base64-encode the hmac
result = BASE64Encoder.encode(rawHmac);
// result = Encoding.EncodeBase64(rawHmac);
} catch (Exception e) {
throw new SignatureException("Failed to generate HMAC : "
+ e.getMessage());
}
return result;
}
public static byte[] hmacSHA1(String data, String key) throws java.security.SignatureException {
try {
// get an hmac_sha1 key from the raw key bytes
SecretKeySpec signingKey = new SecretKeySpec(key.getBytes(),
HMAC_SHA1_ALGORITHM);
// get an hmac_sha1 Mac instance and initialize with the signing key
Mac mac = Mac.getInstance(HMAC_SHA1_ALGORITHM);
mac.init(signingKey);
// compute the hmac on input data bytes
byte[] rawHmac = mac.doFinal(data.getBytes());
return rawHmac;
} catch (Exception e) {
throw new SignatureException("Failed to generate HMAC : "
+ e.getMessage());
}
}
}
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");
}
}