src/jdk.crypto.ucrypto/solaris/classes/com/oracle/security/ucrypto/NativeRSASignature.java - platform/libcore - Git at Google

 /*
  * Copyright (c) 2014, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this
  * particular file as subject to the "Classpath" exception as provided
  * by Oracle in the LICENSE file that accompanied this code.
  *
  * This code 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
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */

 package com.oracle.security.ucrypto;

 import java.util.Set;
 import java.util.Arrays;
 import java.util.concurrent.ConcurrentSkipListSet;
 import java.lang.ref.*;
 import java.math.BigInteger;
 import java.nio.ByteBuffer;

 import java.security.SignatureSpi;
 import java.security.NoSuchAlgorithmException;
 import java.security.InvalidParameterException;
 import java.security.InvalidKeyException;
 import java.security.SignatureException;
 import java.security.Key;
 import java.security.PrivateKey;
 import java.security.PublicKey;

 import java.security.*;
 import java.security.interfaces.*;
 import java.security.spec.*;

 import sun.nio.ch.DirectBuffer;
 import java.nio.ByteBuffer;

 /**
  * Signature implementation class. This class currently supports the
  * following algorithms:
  *
  * . RSA:
  *   . MD5withRSA
  *   . SHA1withRSA
  *   . SHA256withRSA
  *   . SHA384withRSA
  *   . SHA512withRSA
  *
  * @since 9
  */
 class NativeRSASignature extends SignatureSpi {

     private static final int PKCS1PADDING_LEN = 11;

     // fields set in constructor
     private final UcryptoMech mech;
     private final int encodedLen;

     // field for ensuring native memory is freed
     private SignatureContextRef pCtxt = null;

     //
     // fields (re)set in every init()
     //
     private boolean initialized = false;
     private boolean sign = true;
     private int sigLength;
     private NativeKey key;
     private NativeRSAKeyFactory keyFactory; // may need a more generic type later

     // public implementation classes
     public static final class MD5 extends NativeRSASignature {
         public MD5() throws NoSuchAlgorithmException {
             super(UcryptoMech.CRYPTO_MD5_RSA_PKCS, 34);
         }
     }

     public static final class SHA1 extends NativeRSASignature {
         public SHA1() throws NoSuchAlgorithmException {
             super(UcryptoMech.CRYPTO_SHA1_RSA_PKCS, 35);
         }
     }

     public static final class SHA256 extends NativeRSASignature {
         public SHA256() throws NoSuchAlgorithmException {
             super(UcryptoMech.CRYPTO_SHA256_RSA_PKCS, 51);
         }
     }

     public static final class SHA384 extends NativeRSASignature {
         public SHA384() throws NoSuchAlgorithmException {
             super(UcryptoMech.CRYPTO_SHA384_RSA_PKCS, 67);
         }
     }

     public static final class SHA512 extends NativeRSASignature {
         public SHA512() throws NoSuchAlgorithmException {
             super(UcryptoMech.CRYPTO_SHA512_RSA_PKCS, 83);
         }
     }

     // internal class for native resource cleanup
     private static class SignatureContextRef extends PhantomReference<NativeRSASignature>
         implements Comparable<SignatureContextRef> {

         private static ReferenceQueue<NativeRSASignature> refQueue =
             new ReferenceQueue<NativeRSASignature>();

         // Needed to keep these references from being GC'ed until when their
         // referents are GC'ed so we can do post-mortem processing
         private static Set<SignatureContextRef> refList =
             new ConcurrentSkipListSet<SignatureContextRef>();
         //           Collections.synchronizedSortedSet(new TreeSet<SignatureContextRef>());

         private final long id;
         private final boolean sign;

         private static void drainRefQueueBounded() {
             while (true) {
                 SignatureContextRef next = (SignatureContextRef) refQueue.poll();
                 if (next == null) break;
                 next.dispose(true);
             }
         }

         SignatureContextRef(NativeRSASignature ns, long id, boolean sign) {
             super(ns, refQueue);
             this.id = id;
             this.sign = sign;
             refList.add(this);
             UcryptoProvider.debug("Resource: track Signature Ctxt " + this.id);
             drainRefQueueBounded();
         }

         public int compareTo(SignatureContextRef other) {
             if (this.id == other.id) {
                 return 0;
             } else {
                 return (this.id < other.id) ? -1 : 1;
             }
         }

         void dispose(boolean doCancel) {
             refList.remove(this);
             try {
                 if (doCancel) {
                     UcryptoProvider.debug("Resource: free Signature Ctxt " + this.id);
                     NativeRSASignature.nativeFinal(id, sign, null, 0, 0);
                 } else {
                     UcryptoProvider.debug("Resource: stop tracking Signature Ctxt " + this.id);
                 }
             } finally {
                 this.clear();
             }
         }
     }

     NativeRSASignature(UcryptoMech mech, int encodedLen)
         throws NoSuchAlgorithmException {
         this.mech = mech;
         this.encodedLen = encodedLen;
         this.keyFactory = new NativeRSAKeyFactory();
     }

     // deprecated but abstract
     @Override
     @SuppressWarnings("deprecation")
     protected Object engineGetParameter(String param) throws InvalidParameterException {
         throw new UnsupportedOperationException("getParameter() not supported");
     }

     @Override
     protected AlgorithmParameters engineGetParameters() {
         return null;
     }

     @Override
     protected synchronized void engineInitSign(PrivateKey privateKey)
             throws InvalidKeyException {
         if (privateKey == null) {
             throw new InvalidKeyException("Key must not be null");
         }
         NativeKey newKey = key;
         int newSigLength = sigLength;
         // Need to check RSA key length whenever a new private key is set
         if (privateKey != key) {
             if (!(privateKey instanceof RSAPrivateKey)) {
                 throw new InvalidKeyException("RSAPrivateKey required. " +
                     "Received: " + privateKey.getClass().getName());
             }
             RSAPrivateKey rsaPrivKey = (RSAPrivateKey) privateKey;
             BigInteger mod = rsaPrivKey.getModulus();
             newSigLength = checkRSAKeyLength(mod);
             BigInteger pe = rsaPrivKey.getPrivateExponent();
             try {
                 if (rsaPrivKey instanceof RSAPrivateCrtKey) {
                     RSAPrivateCrtKey rsaPrivCrtKey = (RSAPrivateCrtKey) rsaPrivKey;
                     newKey = (NativeKey) keyFactory.engineGeneratePrivate
                         (new RSAPrivateCrtKeySpec(mod,
                                                   rsaPrivCrtKey.getPublicExponent(),
                                                   pe,
                                                   rsaPrivCrtKey.getPrimeP(),
                                                   rsaPrivCrtKey.getPrimeQ(),
                                                   rsaPrivCrtKey.getPrimeExponentP(),
                                                   rsaPrivCrtKey.getPrimeExponentQ(),
                                                   rsaPrivCrtKey.getCrtCoefficient()));
                 } else {
                     newKey = (NativeKey) keyFactory.engineGeneratePrivate
                            (new RSAPrivateKeySpec(mod, pe));
                 }
             } catch (InvalidKeySpecException ikse) {
                 throw new InvalidKeyException(ikse);
             }
         }
         init(true, newKey, newSigLength);
     }


     @Override
     protected synchronized void engineInitVerify(PublicKey publicKey)
             throws InvalidKeyException {
         if (publicKey == null) {
             throw new InvalidKeyException("Key must not be null");
         }
         NativeKey newKey = key;
         int newSigLength = sigLength;
         // Need to check RSA key length whenever a new public key is set
         if (publicKey != key) {
             if (publicKey instanceof RSAPublicKey) {
                 BigInteger mod = ((RSAPublicKey) publicKey).getModulus();
                 newSigLength = checkRSAKeyLength(mod);
                 try {
                     newKey = (NativeKey) keyFactory.engineGeneratePublic
                         (new RSAPublicKeySpec(mod, ((RSAPublicKey) publicKey).getPublicExponent()));
                 } catch (InvalidKeySpecException ikse) {
                     throw new InvalidKeyException(ikse);
                 }
             } else {
                 throw new InvalidKeyException("RSAPublicKey required. " +
                     "Received: " + publicKey.getClass().getName());
             }
         }
         init(false, newKey, newSigLength);
     }

     // deprecated but abstract
     @Override
     @SuppressWarnings("deprecation")
     protected void engineSetParameter(String param, Object value) throws InvalidParameterException {
         throw new UnsupportedOperationException("setParameter() not supported");
     }

     @Override
     protected void engineSetParameter(AlgorithmParameterSpec params)
             throws InvalidAlgorithmParameterException {
         if (params != null) {
             throw new InvalidAlgorithmParameterException("No parameter accepted");
         }
     }

     @Override
     protected synchronized byte[] engineSign() throws SignatureException {
         try {
             byte[] sig = new byte[sigLength];
             int rv = doFinal(sig, 0, sigLength);
             if (rv < 0) {
                 throw new SignatureException(new UcryptoException(-rv));
             }
             return sig;
         } finally {
             // doFinal should already be called, no need to cancel
             reset(false);
         }
     }

     @Override
     protected synchronized int engineSign(byte[] outbuf, int offset, int len)
         throws SignatureException {
         boolean doCancel = true;
         try {
             if (outbuf == null || (offset < 0) ||
                     ((outbuf.length - offset) < sigLength) ||
                     (len < sigLength)) {
                 throw new SignatureException("Invalid output buffer. offset: " +
                     offset + ". len: " + len + ". sigLength: " + sigLength);
             }
             int rv = doFinal(outbuf, offset, sigLength);
             doCancel = false;
             if (rv < 0) {
                 throw new SignatureException(new UcryptoException(-rv));
             }
             return sigLength;
         } finally {
             reset(doCancel);
         }
     }

     @Override
     protected synchronized void engineUpdate(byte b) throws SignatureException {
         byte[] in = { b };
         int rv = update(in, 0, 1);
         if (rv < 0) {
             throw new SignatureException(new UcryptoException(-rv));
         }
     }

     @Override
     protected synchronized void engineUpdate(byte[] in, int inOfs, int inLen)
             throws SignatureException {
         if (in == null || inOfs < 0 || inLen == 0) return;

         int rv = update(in, inOfs, inLen);
         if (rv < 0) {
             throw new SignatureException(new UcryptoException(-rv));
         }
     }

     @Override
     protected synchronized void engineUpdate(ByteBuffer in) {
         if (in == null || in.remaining() == 0) return;

         if (in instanceof DirectBuffer == false) {
             // cannot do better than default impl
             super.engineUpdate(in);
             return;
         }
         long inAddr = ((DirectBuffer)in).address();
         int inOfs = in.position();
         int inLen = in.remaining();

         int rv = update((inAddr + inOfs), inLen);
         if (rv < 0) {
             throw new UcryptoException(-rv);
         }
         in.position(inOfs + inLen);
     }

     @Override
     protected synchronized boolean engineVerify(byte[] sigBytes) throws SignatureException {
         return engineVerify(sigBytes, 0, sigBytes.length);
     }

     @Override
     protected synchronized boolean engineVerify(byte[] sigBytes, int sigOfs, int sigLen)
         throws SignatureException {
         boolean doCancel = true;
         try {
             if (sigBytes == null || (sigOfs < 0) ||
                     ((sigBytes.length - sigOfs) < this.sigLength) ||
                     (sigLen != this.sigLength)) {
                 throw new SignatureException("Invalid signature length: got " +
                     sigLen + " but was expecting " + this.sigLength);
             }

             int rv = doFinal(sigBytes, sigOfs, sigLen);
             doCancel = false;
             if (rv == 0) {
                 return true;
             } else {
                 UcryptoProvider.debug("Signature: " + mech + " verification error " +
                              new UcryptoException(-rv).getMessage());
                 return false;
             }
         } finally {
             reset(doCancel);
         }
     }

     void reset(boolean doCancel) {
         initialized = false;
         if (pCtxt != null) {
             pCtxt.dispose(doCancel);
             pCtxt = null;
         }
     }

     /**
      * calls ucrypto_sign_init(...) or ucrypto_verify_init(...)
      * @return pointer to the context
      */
     private native static long nativeInit(int mech, boolean sign,
                                           long keyValue, int keyLength);

     /**
      * calls ucrypto_sign_update(...) or ucrypto_verify_update(...)
      * @return an error status code (0 means SUCCESS)
      */
     private native static int nativeUpdate(long pContext, boolean sign,
                                            byte[] in, int inOfs, int inLen);
     /**
      * calls ucrypto_sign_update(...) or ucrypto_verify_update(...)
      * @return an error status code (0 means SUCCESS)
      */
     private native static int nativeUpdate(long pContext, boolean sign,
                                            long pIn, int inLen);

     /**
      * calls ucrypto_sign_final(...) or ucrypto_verify_final(...)
      * @return the length of signature bytes or verification status.
      * If negative, it indicates an error status code
      */
     private native static int nativeFinal(long pContext, boolean sign,
                                           byte[] sig, int sigOfs, int sigLen);

     // actual init() implementation - caller should clone key if needed
     private void init(boolean sign, NativeKey key, int sigLength) {
         reset(true);
         this.sign = sign;
         this.sigLength = sigLength;
         this.key = key;
         long pCtxtVal = nativeInit(mech.value(), sign, key.value(),
                                    key.length());
         initialized = (pCtxtVal != 0L);
         if (initialized) {
             pCtxt = new SignatureContextRef(this, pCtxtVal, sign);
         } else {
             throw new UcryptoException("Cannot initialize Signature");
         }
     }

     private void ensureInitialized() {
         if (!initialized) {
             init(sign, key, sigLength);
             if (!initialized) {
                 throw new UcryptoException("Cannot initialize Signature");
             }
         }
     }

     // returns 0 (success) or negative (ucrypto error occurred)
     private int update(byte[] in, int inOfs, int inLen) {
         if (inOfs < 0 || inOfs > (in.length - inLen)) {
             throw new ArrayIndexOutOfBoundsException("inOfs :" + inOfs +
                 ". inLen: " + inLen + ". in.length: " + in.length);
         }
         ensureInitialized();
         int k = nativeUpdate(pCtxt.id, sign, in, inOfs, inLen);
         if (k < 0) {
             reset(false);
         }
         return k;
     }

     // returns 0 (success) or negative (ucrypto error occurred)
     private int update(long pIn, int inLen) {
         ensureInitialized();
         int k = nativeUpdate(pCtxt.id, sign, pIn, inLen);
         if (k < 0) {
             reset(false);
         }
         return k;
     }

     // returns 0 (success) or negative (ucrypto error occurred)
     private int doFinal(byte[] sigBytes, int sigOfs, int sigLen) {
         ensureInitialized();
         int k = nativeFinal(pCtxt.id, sign, sigBytes, sigOfs, sigLen);
         return k;
     }

     // check and return RSA key size in number of bytes
     private int checkRSAKeyLength(BigInteger mod) throws InvalidKeyException {
         int keySize = (mod.bitLength() + 7) >> 3;
         int maxDataSize = keySize - PKCS1PADDING_LEN;
         if (maxDataSize < encodedLen) {
             throw new InvalidKeyException
                 ("Key is too short for this signature algorithm. maxDataSize: " +
                     maxDataSize + ". encodedLen: " + encodedLen);
         }
         return keySize;
     }
 }
	/*
	* Copyright (c) 2014, 2018, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code 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
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	package com.oracle.security.ucrypto;

	import java.util.Set;
	import java.util.Arrays;
	import java.util.concurrent.ConcurrentSkipListSet;
	import java.lang.ref.*;
	import java.math.BigInteger;
	import java.nio.ByteBuffer;

	import java.security.SignatureSpi;
	import java.security.NoSuchAlgorithmException;
	import java.security.InvalidParameterException;
	import java.security.InvalidKeyException;
	import java.security.SignatureException;
	import java.security.Key;
	import java.security.PrivateKey;
	import java.security.PublicKey;

	import java.security.*;
	import java.security.interfaces.*;
	import java.security.spec.*;

	import sun.nio.ch.DirectBuffer;
	import java.nio.ByteBuffer;

	/**
	* Signature implementation class. This class currently supports the
	* following algorithms:
	*
	* . RSA:
	* . MD5withRSA
	* . SHA1withRSA
	* . SHA256withRSA
	* . SHA384withRSA
	* . SHA512withRSA
	*
	* @since 9
	*/
	class NativeRSASignature extends SignatureSpi {

	private static final int PKCS1PADDING_LEN = 11;

	// fields set in constructor
	private final UcryptoMech mech;
	private final int encodedLen;

	// field for ensuring native memory is freed
	private SignatureContextRef pCtxt = null;

	//
	// fields (re)set in every init()
	//
	private boolean initialized = false;
	private boolean sign = true;
	private int sigLength;
	private NativeKey key;
	private NativeRSAKeyFactory keyFactory; // may need a more generic type later

	// public implementation classes
	public static final class MD5 extends NativeRSASignature {
	public MD5() throws NoSuchAlgorithmException {
	super(UcryptoMech.CRYPTO_MD5_RSA_PKCS, 34);
	}
	}

	public static final class SHA1 extends NativeRSASignature {
	public SHA1() throws NoSuchAlgorithmException {
	super(UcryptoMech.CRYPTO_SHA1_RSA_PKCS, 35);
	}
	}

	public static final class SHA256 extends NativeRSASignature {
	public SHA256() throws NoSuchAlgorithmException {
	super(UcryptoMech.CRYPTO_SHA256_RSA_PKCS, 51);
	}
	}

	public static final class SHA384 extends NativeRSASignature {
	public SHA384() throws NoSuchAlgorithmException {
	super(UcryptoMech.CRYPTO_SHA384_RSA_PKCS, 67);
	}
	}

	public static final class SHA512 extends NativeRSASignature {
	public SHA512() throws NoSuchAlgorithmException {
	super(UcryptoMech.CRYPTO_SHA512_RSA_PKCS, 83);
	}
	}

	// internal class for native resource cleanup
	private static class SignatureContextRef extends PhantomReference<NativeRSASignature>
	implements Comparable<SignatureContextRef> {

	private static ReferenceQueue<NativeRSASignature> refQueue =
	new ReferenceQueue<NativeRSASignature>();

	// Needed to keep these references from being GC'ed until when their
	// referents are GC'ed so we can do post-mortem processing
	private static Set<SignatureContextRef> refList =
	new ConcurrentSkipListSet<SignatureContextRef>();
	// Collections.synchronizedSortedSet(new TreeSet<SignatureContextRef>());

	private final long id;
	private final boolean sign;

	private static void drainRefQueueBounded() {
	while (true) {
	SignatureContextRef next = (SignatureContextRef) refQueue.poll();
	if (next == null) break;
	next.dispose(true);
	}
	}

	SignatureContextRef(NativeRSASignature ns, long id, boolean sign) {
	super(ns, refQueue);
	this.id = id;
	this.sign = sign;
	refList.add(this);
	UcryptoProvider.debug("Resource: track Signature Ctxt " + this.id);
	drainRefQueueBounded();
	}

	public int compareTo(SignatureContextRef other) {
	if (this.id == other.id) {
	return 0;
	} else {
	return (this.id < other.id) ? -1 : 1;
	}
	}

	void dispose(boolean doCancel) {
	refList.remove(this);
	try {
	if (doCancel) {
	UcryptoProvider.debug("Resource: free Signature Ctxt " + this.id);
	NativeRSASignature.nativeFinal(id, sign, null, 0, 0);
	} else {
	UcryptoProvider.debug("Resource: stop tracking Signature Ctxt " + this.id);
	}
	} finally {
	this.clear();
	}
	}
	}

	NativeRSASignature(UcryptoMech mech, int encodedLen)
	throws NoSuchAlgorithmException {
	this.mech = mech;
	this.encodedLen = encodedLen;
	this.keyFactory = new NativeRSAKeyFactory();
	}

	// deprecated but abstract
	@Override
	@SuppressWarnings("deprecation")
	protected Object engineGetParameter(String param) throws InvalidParameterException {
	throw new UnsupportedOperationException("getParameter() not supported");
	}

	@Override
	protected AlgorithmParameters engineGetParameters() {
	return null;
	}

	@Override
	protected synchronized void engineInitSign(PrivateKey privateKey)
	throws InvalidKeyException {
	if (privateKey == null) {
	throw new InvalidKeyException("Key must not be null");
	}
	NativeKey newKey = key;
	int newSigLength = sigLength;
	// Need to check RSA key length whenever a new private key is set
	if (privateKey != key) {
	if (!(privateKey instanceof RSAPrivateKey)) {
	throw new InvalidKeyException("RSAPrivateKey required. " +
	"Received: " + privateKey.getClass().getName());
	}
	RSAPrivateKey rsaPrivKey = (RSAPrivateKey) privateKey;
	BigInteger mod = rsaPrivKey.getModulus();
	newSigLength = checkRSAKeyLength(mod);
	BigInteger pe = rsaPrivKey.getPrivateExponent();
	try {
	if (rsaPrivKey instanceof RSAPrivateCrtKey) {
	RSAPrivateCrtKey rsaPrivCrtKey = (RSAPrivateCrtKey) rsaPrivKey;
	newKey = (NativeKey) keyFactory.engineGeneratePrivate
	(new RSAPrivateCrtKeySpec(mod,
	rsaPrivCrtKey.getPublicExponent(),
	pe,
	rsaPrivCrtKey.getPrimeP(),
	rsaPrivCrtKey.getPrimeQ(),
	rsaPrivCrtKey.getPrimeExponentP(),
	rsaPrivCrtKey.getPrimeExponentQ(),
	rsaPrivCrtKey.getCrtCoefficient()));
	} else {
	newKey = (NativeKey) keyFactory.engineGeneratePrivate
	(new RSAPrivateKeySpec(mod, pe));
	}
	} catch (InvalidKeySpecException ikse) {
	throw new InvalidKeyException(ikse);
	}
	}
	init(true, newKey, newSigLength);
	}


	@Override
	protected synchronized void engineInitVerify(PublicKey publicKey)
	throws InvalidKeyException {
	if (publicKey == null) {
	throw new InvalidKeyException("Key must not be null");
	}
	NativeKey newKey = key;
	int newSigLength = sigLength;
	// Need to check RSA key length whenever a new public key is set
	if (publicKey != key) {
	if (publicKey instanceof RSAPublicKey) {
	BigInteger mod = ((RSAPublicKey) publicKey).getModulus();
	newSigLength = checkRSAKeyLength(mod);
	try {
	newKey = (NativeKey) keyFactory.engineGeneratePublic
	(new RSAPublicKeySpec(mod, ((RSAPublicKey) publicKey).getPublicExponent()));
	} catch (InvalidKeySpecException ikse) {
	throw new InvalidKeyException(ikse);
	}
	} else {
	throw new InvalidKeyException("RSAPublicKey required. " +
	"Received: " + publicKey.getClass().getName());
	}
	}
	init(false, newKey, newSigLength);
	}

	// deprecated but abstract
	@Override
	@SuppressWarnings("deprecation")
	protected void engineSetParameter(String param, Object value) throws InvalidParameterException {
	throw new UnsupportedOperationException("setParameter() not supported");
	}

	@Override
	protected void engineSetParameter(AlgorithmParameterSpec params)
	throws InvalidAlgorithmParameterException {
	if (params != null) {
	throw new InvalidAlgorithmParameterException("No parameter accepted");
	}
	}

	@Override
	protected synchronized byte[] engineSign() throws SignatureException {
	try {
	byte[] sig = new byte[sigLength];
	int rv = doFinal(sig, 0, sigLength);
	if (rv < 0) {
	throw new SignatureException(new UcryptoException(-rv));
	}
	return sig;
	} finally {
	// doFinal should already be called, no need to cancel
	reset(false);
	}
	}

	@Override
	protected synchronized int engineSign(byte[] outbuf, int offset, int len)
	throws SignatureException {
	boolean doCancel = true;
	try {
	if (outbuf == null \|\| (offset < 0) \|\|
	((outbuf.length - offset) < sigLength) \|\|
	(len < sigLength)) {
	throw new SignatureException("Invalid output buffer. offset: " +
	offset + ". len: " + len + ". sigLength: " + sigLength);
	}
	int rv = doFinal(outbuf, offset, sigLength);
	doCancel = false;
	if (rv < 0) {
	throw new SignatureException(new UcryptoException(-rv));
	}
	return sigLength;
	} finally {
	reset(doCancel);
	}
	}

	@Override
	protected synchronized void engineUpdate(byte b) throws SignatureException {
	byte[] in = { b };
	int rv = update(in, 0, 1);
	if (rv < 0) {
	throw new SignatureException(new UcryptoException(-rv));
	}
	}

	@Override
	protected synchronized void engineUpdate(byte[] in, int inOfs, int inLen)
	throws SignatureException {
	if (in == null \|\| inOfs < 0 \|\| inLen == 0) return;

	int rv = update(in, inOfs, inLen);
	if (rv < 0) {
	throw new SignatureException(new UcryptoException(-rv));
	}
	}

	@Override
	protected synchronized void engineUpdate(ByteBuffer in) {
	if (in == null \|\| in.remaining() == 0) return;

	if (in instanceof DirectBuffer == false) {
	// cannot do better than default impl
	super.engineUpdate(in);
	return;
	}
	long inAddr = ((DirectBuffer)in).address();
	int inOfs = in.position();
	int inLen = in.remaining();

	int rv = update((inAddr + inOfs), inLen);
	if (rv < 0) {
	throw new UcryptoException(-rv);
	}
	in.position(inOfs + inLen);
	}

	@Override
	protected synchronized boolean engineVerify(byte[] sigBytes) throws SignatureException {
	return engineVerify(sigBytes, 0, sigBytes.length);
	}

	@Override
	protected synchronized boolean engineVerify(byte[] sigBytes, int sigOfs, int sigLen)
	throws SignatureException {
	boolean doCancel = true;
	try {
	if (sigBytes == null \|\| (sigOfs < 0) \|\|
	((sigBytes.length - sigOfs) < this.sigLength) \|\|
	(sigLen != this.sigLength)) {
	throw new SignatureException("Invalid signature length: got " +
	sigLen + " but was expecting " + this.sigLength);
	}

	int rv = doFinal(sigBytes, sigOfs, sigLen);
	doCancel = false;
	if (rv == 0) {
	return true;
	} else {
	UcryptoProvider.debug("Signature: " + mech + " verification error " +
	new UcryptoException(-rv).getMessage());
	return false;
	}
	} finally {
	reset(doCancel);
	}
	}

	void reset(boolean doCancel) {
	initialized = false;
	if (pCtxt != null) {
	pCtxt.dispose(doCancel);
	pCtxt = null;
	}
	}

	/**
	* calls ucrypto_sign_init(...) or ucrypto_verify_init(...)
	* @return pointer to the context
	*/
	private native static long nativeInit(int mech, boolean sign,
	long keyValue, int keyLength);

	/**
	* calls ucrypto_sign_update(...) or ucrypto_verify_update(...)
	* @return an error status code (0 means SUCCESS)
	*/
	private native static int nativeUpdate(long pContext, boolean sign,
	byte[] in, int inOfs, int inLen);
	/**
	* calls ucrypto_sign_update(...) or ucrypto_verify_update(...)
	* @return an error status code (0 means SUCCESS)
	*/
	private native static int nativeUpdate(long pContext, boolean sign,
	long pIn, int inLen);

	/**
	* calls ucrypto_sign_final(...) or ucrypto_verify_final(...)
	* @return the length of signature bytes or verification status.
	* If negative, it indicates an error status code
	*/
	private native static int nativeFinal(long pContext, boolean sign,
	byte[] sig, int sigOfs, int sigLen);

	// actual init() implementation - caller should clone key if needed
	private void init(boolean sign, NativeKey key, int sigLength) {
	reset(true);
	this.sign = sign;
	this.sigLength = sigLength;
	this.key = key;
	long pCtxtVal = nativeInit(mech.value(), sign, key.value(),
	key.length());
	initialized = (pCtxtVal != 0L);
	if (initialized) {
	pCtxt = new SignatureContextRef(this, pCtxtVal, sign);
	} else {
	throw new UcryptoException("Cannot initialize Signature");
	}
	}

	private void ensureInitialized() {
	if (!initialized) {
	init(sign, key, sigLength);
	if (!initialized) {
	throw new UcryptoException("Cannot initialize Signature");
	}
	}
	}

	// returns 0 (success) or negative (ucrypto error occurred)
	private int update(byte[] in, int inOfs, int inLen) {
	if (inOfs < 0 \|\| inOfs > (in.length - inLen)) {
	throw new ArrayIndexOutOfBoundsException("inOfs :" + inOfs +
	". inLen: " + inLen + ". in.length: " + in.length);
	}
	ensureInitialized();
	int k = nativeUpdate(pCtxt.id, sign, in, inOfs, inLen);
	if (k < 0) {
	reset(false);
	}
	return k;
	}

	// returns 0 (success) or negative (ucrypto error occurred)
	private int update(long pIn, int inLen) {
	ensureInitialized();
	int k = nativeUpdate(pCtxt.id, sign, pIn, inLen);
	if (k < 0) {
	reset(false);
	}
	return k;
	}

	// returns 0 (success) or negative (ucrypto error occurred)
	private int doFinal(byte[] sigBytes, int sigOfs, int sigLen) {
	ensureInitialized();
	int k = nativeFinal(pCtxt.id, sign, sigBytes, sigOfs, sigLen);
	return k;
	}

	// check and return RSA key size in number of bytes
	private int checkRSAKeyLength(BigInteger mod) throws InvalidKeyException {
	int keySize = (mod.bitLength() + 7) >> 3;
	int maxDataSize = keySize - PKCS1PADDING_LEN;
	if (maxDataSize < encodedLen) {
	throw new InvalidKeyException
	("Key is too short for this signature algorithm. maxDataSize: " +
	maxDataSize + ". encodedLen: " + encodedLen);
	}
	return keySize;
	}
	}