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/*
* Copyright (c) 2005, 2019, 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 sun.security.mscapi;
import sun.security.util.KeyUtil;
import sun.security.util.Length;
import java.math.BigInteger;
import java.security.Key;
import java.security.interfaces.ECPrivateKey;
import java.security.interfaces.ECPublicKey;
/**
* The handle for a key using the Microsoft Crypto API.
*
* @see CPrivateKey
* @see CPublicKey
*
* @since 1.6
* @author Stanley Man-Kit Ho
*/
abstract class CKey implements Key, Length {
private static final long serialVersionUID = -1088859394025049194L;
static class NativeHandles {
long hCryptProv = 0;
long hCryptKey = 0;
public NativeHandles(long hCryptProv, long hCryptKey) {
this.hCryptProv = hCryptProv;
this.hCryptKey = hCryptKey;
}
@SuppressWarnings("deprecation")
protected void finalize() throws Throwable {
try {
synchronized(this) {
cleanUp(hCryptProv, hCryptKey);
hCryptProv = 0;
hCryptKey = 0;
}
} finally {
super.finalize();
}
}
}
protected final NativeHandles handles;
protected final int keyLength;
protected final String algorithm;
protected CKey(String algorithm, NativeHandles handles, int keyLength) {
this.algorithm = algorithm;
this.handles = handles;
this.keyLength = keyLength;
}
// Native method to cleanup the key handle.
private native static void cleanUp(long hCryptProv, long hCryptKey);
@Override
public int length() {
return keyLength;
}
public long getHCryptKey() {
return handles.hCryptKey;
}
public long getHCryptProvider() {
return handles.hCryptProv;
}
public String getAlgorithm() {
return algorithm;
}
protected native static String getContainerName(long hCryptProv);
protected native static String getKeyType(long hCryptKey);
// This java method generates EC BLOBs for public key or private key.
// See https://docs.microsoft.com/en-us/windows/desktop/api/bcrypt/ns-bcrypt-_bcrypt_ecckey_blob
static byte[] generateECBlob(Key k) {
int keyBitLength = KeyUtil.getKeySize(k);
int keyLen = (keyBitLength + 7) / 8;
boolean isPrivate = k instanceof ECPrivateKey;
byte[] keyBlob = new byte[8 + keyLen * (isPrivate ? 3 : 2)];
keyBlob[0] = 'E';
keyBlob[1] = 'C';
keyBlob[2] = 'S';
if (isPrivate) {
keyBlob[3] = (byte) (keyBitLength == 256 ? '2'
: (keyBitLength == 384 ? '4' : '6'));
} else {
keyBlob[3] = (byte) (keyBitLength == 256 ? '1'
: (keyBitLength == 384 ? '3' : '5'));
}
BigInteger x;
BigInteger y;
// Fill the array in reverse order (s -> y -> x -> len) in case
// one BigInteger encoding has an extra 0 at the beginning
if (isPrivate) {
// We can keep X and Y zero and it still works
ECPrivateKey prk = (ECPrivateKey)k;
BigInteger s = prk.getS();
byte[] bs = s.toByteArray();
System.arraycopy(
bs, 0,
keyBlob, 8 + keyLen + keyLen + keyLen - bs.length,
bs.length);
} else {
ECPublicKey puk = (ECPublicKey)k;
x = puk.getW().getAffineX();
y = puk.getW().getAffineY();
byte[] by = y.toByteArray();
System.arraycopy(by, 0, keyBlob, 8 + keyLen + keyLen - by.length,
by.length);
byte[] bx = x.toByteArray();
System.arraycopy(bx, 0, keyBlob, 8 + keyLen - bx.length, bx.length);
}
keyBlob[4] = (byte) keyLen;
keyBlob[5] = keyBlob[6] = keyBlob[7] = 0;
return keyBlob;
}
}
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