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package org.openslx.imagemaster.util;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.KeyPair;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.SignatureException;
import java.security.UnrecoverableKeyException;
import java.security.cert.Certificate;
import java.security.cert.CertificateException;
public class AsymMessageSign
{
KeyPair pair;
// String alias = "ftp";
// String password = "password";
// String file = "./config/keystore.jks";
public AsymMessageSign(String alias, String password, String file) throws NoSuchAlgorithmException, CertificateException, FileNotFoundException, IOException, KeyStoreException, UnrecoverableKeyException
{
KeyStore keystore = KeyStore.getInstance( "JKS" );
keystore.load( new FileInputStream( new File( file ) ), password.toCharArray() );
Certificate cert = null;
Key key = keystore.getKey( alias,
password.toCharArray() );
if ( key instanceof PrivateKey ) {
cert = keystore.getCertificate( alias );
PublicKey publicKey = cert.getPublicKey();
pair = new KeyPair( publicKey, (PrivateKey)key );
}
}
public byte[] signMessage( String message ) throws NoSuchAlgorithmException, InvalidKeyException, SignatureException
{
Signature signature = Signature.getInstance( "SHA256WITHRSA" );
signature.initSign( pair.getPrivate() );
signature.update( message.getBytes() );
return signature.sign();
}
public boolean verifyMessage( byte[] signedMessage, byte[] realMessage ) throws NoSuchAlgorithmException, InvalidKeyException, SignatureException
{
Signature signature = Signature.getInstance( "SHA256WITHRSA" );
signature.initVerify( pair.getPublic() );
signature.update( realMessage );
return signature.verify( signedMessage );
}
}
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