package gnu.crypto.jce.sig;
// ----------------------------------------------------------------------------
// $Id: SignatureAdapter.java,v 1.2 2005/10/06 04:24:16 rsdio Exp $
//
// Copyright (C) 2001, 2002, Free Software Foundation, Inc.
//
// This file is part of GNU Crypto.
//
// GNU Crypto is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2, or (at your option)
// any later version.
//
// GNU Crypto is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; see the file COPYING. If not, write to the
//
// Free Software Foundation Inc.,
// 51 Franklin Street, Fifth Floor,
// Boston, MA 02110-1301
// USA
//
// Linking this library statically or dynamically with other modules is
// making a combined work based on this library. Thus, the terms and
// conditions of the GNU General Public License cover the whole
// combination.
//
// As a special exception, the copyright holders of this library give
// you permission to link this library with independent modules to
// produce an executable, regardless of the license terms of these
// independent modules, and to copy and distribute the resulting
// executable under terms of your choice, provided that you also meet,
// for each linked independent module, the terms and conditions of the
// license of that module. An independent module is a module which is
// not derived from or based on this library. If you modify this
// library, you may extend this exception to your version of the
// library, but you are not obligated to do so. If you do not wish to
// do so, delete this exception statement from your version.
// ----------------------------------------------------------------------------
import gnu.crypto.sig.BaseSignature;
import gnu.crypto.sig.ISignature;
import gnu.crypto.sig.ISignatureCodec;
import gnu.crypto.sig.SignatureFactory;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.InvalidParameterException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.SignatureException;
import java.security.SignatureSpi;
import java.security.spec.AlgorithmParameterSpec;
import java.util.HashMap;
/**
* The implementation of a generic {@link java.security.Signature} adapter class
* to wrap gnu.crypto signature instances.<p>
*
* This class defines the <i>Service Provider Interface</i> (<b>SPI</b>) for the
* {@link java.security.Signature} class, which provides the functionality of a
* digital signature algorithm. Digital signatures are used for authentication
* and integrity assurance of digital data.<p>
*
* All the abstract methods in the {@link java.security.SignatureSpi} class are
* implemented by this class and all its sub-classes.<p>
*
* All the implementations which subclass this object, and which are serviced by
* the GNU Crypto provider implement the {@link java.lang.Cloneable} interface.<p>
*
* @version $Revision: 1.2 $
*/
class SignatureAdapter extends SignatureSpi implements Cloneable {
// Constants and variables
// -------------------------------------------------------------------------
/** Our underlying signature instance. */
private ISignature adaptee;
/** Our underlying signature encoder/decoder engine. */
private ISignatureCodec codec;
// Constructor(s)
// -------------------------------------------------------------------------
/**
* Trivial protected constructor.<p>
*
* @param sigName the canonical name of the signature scheme.
* @param codec the signature codec engine to use with this scheme.
*/
protected SignatureAdapter(String sigName, ISignatureCodec codec) {
this(SignatureFactory.getInstance(sigName), codec);
}
/**
* Private constructor for cloning purposes.<p>
*
* @param adaptee a clone of the underlying signature scheme instance.
* @param codec the signature codec engine to use with this scheme.
*/
private SignatureAdapter(ISignature adaptee, ISignatureCodec codec) {
super();
this.adaptee = adaptee;
this.codec = codec;
}
// Class methods
// -------------------------------------------------------------------------
// java.security.SignatureSpi interface implementation
// -------------------------------------------------------------------------
public Object clone() {
return new SignatureAdapter((ISignature) adaptee.clone(), codec);
}
public void engineInitVerify(PublicKey publicKey)
throws InvalidKeyException {
HashMap attributes = new HashMap();
attributes.put(BaseSignature.VERIFIER_KEY, publicKey);
try {
adaptee.setupVerify(attributes);
} catch (IllegalArgumentException x) {
throw new InvalidKeyException(String.valueOf(x));
}
}
public void engineInitSign(PrivateKey privateKey)
throws InvalidKeyException {
HashMap attributes = new HashMap();
attributes.put(BaseSignature.SIGNER_KEY, privateKey);
try {
adaptee.setupSign(attributes);
} catch (IllegalArgumentException x) {
throw new InvalidKeyException(String.valueOf(x));
}
}
public void engineInitSign(PrivateKey privateKey, SecureRandom random)
throws InvalidKeyException {
HashMap attributes = new HashMap();
attributes.put(BaseSignature.SIGNER_KEY, privateKey);
attributes.put(BaseSignature.SOURCE_OF_RANDOMNESS, random);
try {
adaptee.setupSign(attributes);
} catch (IllegalArgumentException x) {
throw new InvalidKeyException(String.valueOf(x));
}
}
public void engineUpdate(byte b) throws SignatureException {
try {
adaptee.update(b);
} catch (IllegalStateException x) {
throw new SignatureException(String.valueOf(x));
}
}
public void engineUpdate(byte[] b, int off, int len)
throws SignatureException {
try {
adaptee.update(b, off, len);
} catch (IllegalStateException x) {
throw new SignatureException(String.valueOf(x));
}
}
public byte[] engineSign() throws SignatureException {
Object signature = null;
try {
signature = adaptee.sign();
} catch (IllegalStateException x) {
throw new SignatureException(String.valueOf(x));
}
byte[] result = codec.encodeSignature(signature);
return result;
}
public int engineSign(byte[] outbuf, int offset, int len)
throws SignatureException {
byte[] signature = this.engineSign();
int result = signature.length;
if (result > len) {
throw new SignatureException("len");
}
System.arraycopy(signature, 0, outbuf, offset, result);
return result;
}
public boolean engineVerify(byte[] sigBytes) throws SignatureException {
Object signature = codec.decodeSignature(sigBytes);
boolean result = false;
try {
result = adaptee.verify(signature);
} catch (IllegalStateException x) {
throw new SignatureException(String.valueOf(x));
}
return result;
}
// Deprecated. Replaced by engineSetParameter.
public void engineSetParameter(String param, Object value)
throws InvalidParameterException {
throw new InvalidParameterException("deprecated");
}
public void engineSetParameter(AlgorithmParameterSpec params)
throws InvalidAlgorithmParameterException {
}
// Deprecated
public Object engineGetParameter(String param)
throws InvalidParameterException {
throw new InvalidParameterException("deprecated");
}
}