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package org.glassfish.jersey.oauth1.signature;
import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.security.InvalidKeyException;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.Signature;
import java.security.SignatureException;
import java.security.cert.Certificate;
import java.security.cert.CertificateFactory;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.EncodedKeySpec;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.glassfish.jersey.oauth1.signature.internal.LocalizationMessages;
/**
* An OAuth signature method that implements RSA-SHA1.
*
* @author Hubert A. Le Van Gong <hubert.levangong at Sun.COM>
* @author Paul C. Bryan <pbryan@sun.com>
*/
public final class RsaSha1Method implements OAuth1SignatureMethod {
private static final Logger LOGGER = Logger.getLogger(RsaSha1Method.class.getName());
public static final String NAME = "RSA-SHA1";
private static final String SIGNATURE_ALGORITHM = "SHA1withRSA";
private static final String KEY_TYPE = "RSA";
private static final String BEGIN_CERT = "-----BEGIN CERTIFICATE";
@Override
public String name() {
return NAME;
}
/**
* Generates the RSA-SHA1 signature of OAuth request elements.
*
* @param baseString the combined OAuth elements to sign.
* @param secrets the secrets object containing the private key for generating the signature.
* @return the OAuth signature, in base64-encoded form.
* @throws InvalidSecretException if the supplied secret is not valid.
*/
@Override
public String sign(final String baseString, final OAuth1Secrets secrets) throws InvalidSecretException {
final Signature signature;
try {
signature = Signature.getInstance(SIGNATURE_ALGORITHM);
} catch (final NoSuchAlgorithmException nsae) {
throw new IllegalStateException(nsae);
}
byte[] decodedPrivateKey;
try {
decodedPrivateKey = Base64.decode(secrets.getConsumerSecret());
} catch (final IOException ioe) {
throw new InvalidSecretException(LocalizationMessages.ERROR_INVALID_CONSUMER_SECRET(ioe));
}
final KeyFactory keyFactory;
try {
keyFactory = KeyFactory.getInstance(KEY_TYPE);
} catch (final NoSuchAlgorithmException nsae) {
throw new IllegalStateException(nsae);
}
final EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(decodedPrivateKey);
final RSAPrivateKey rsaPrivateKey;
try {
rsaPrivateKey = (RSAPrivateKey) keyFactory.generatePrivate(keySpec);
} catch (final InvalidKeySpecException ikse) {
throw new IllegalStateException(ikse);
}
try {
signature.initSign(rsaPrivateKey);
} catch (final InvalidKeyException ike) {
throw new IllegalStateException(ike);
}
try {
signature.update(baseString.getBytes());
} catch (final SignatureException se) {
throw new IllegalStateException(se);
}
final byte[] rsasha1;
try {
rsasha1 = signature.sign();
} catch (final SignatureException se) {
throw new IllegalStateException(se);
}
return Base64.encode(rsasha1);
}
/**
* Verifies the RSA-SHA1 signature of OAuth request elements.
*
* @param elements OAuth elements signature is to be verified against.
* @param secrets the secrets object containing the public key for verifying the signature.
* @param signature base64-encoded OAuth signature to be verified.
* @throws InvalidSecretException if the supplied secret is not valid.
*/
@Override
public boolean verify(final String elements, final OAuth1Secrets secrets, final String signature) throws InvalidSecretException {
final Signature sig;
try {
sig = Signature.getInstance(SIGNATURE_ALGORITHM);
} catch (final NoSuchAlgorithmException nsae) {
throw new IllegalStateException(nsae);
}
RSAPublicKey rsaPubKey = null;
final String tmpkey = secrets.getConsumerSecret();
if (tmpkey.startsWith(BEGIN_CERT)) {
try {
Certificate cert = null;
final ByteArrayInputStream bais = new ByteArrayInputStream(tmpkey.getBytes());
final BufferedInputStream bis = new BufferedInputStream(bais);
final CertificateFactory certfac = CertificateFactory.getInstance("X.509");
while (bis.available() > 0) {
cert = certfac.generateCertificate(bis);
}
rsaPubKey = (RSAPublicKey) cert.getPublicKey();
} catch (final Exception ex) {
LOGGER.log(Level.SEVERE, LocalizationMessages.ERROR_CANNOT_OBTAIN_PUBLIC_KEY(), ex);
return false;
}
}
final byte[] decodedSignature;
try {
decodedSignature = Base64.decode(signature);
} catch (final IOException e) {
return false;
}
try {
sig.initVerify(rsaPubKey);
} catch (final InvalidKeyException ike) {
throw new IllegalStateException(ike);
}
try {
sig.update(elements.getBytes());
} catch (final SignatureException se) {
throw new IllegalStateException(se);
}
try {
return sig.verify(decodedSignature);
} catch (final SignatureException se) {
throw new IllegalStateException(se);
}
}
}