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/*
* Copyright (c) 2006, 2013, 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.ec;
import java.io.IOException;
import java.math.BigInteger;
import java.security.*;
import java.security.interfaces.*;
import java.security.spec.*;
import sun.security.util.*;
import sun.security.x509.AlgorithmId;
import sun.security.pkcs.PKCS8Key;
/**
* Key implementation for EC private keys.
*
* ASN.1 syntax for EC private keys from SEC 1 v1.5 (draft):
*
* <pre>
* EXPLICIT TAGS
*
* ECPrivateKey ::= SEQUENCE {
* version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
* privateKey OCTET STRING,
* parameters [0] ECDomainParameters {{ SECGCurveNames }} OPTIONAL,
* publicKey [1] BIT STRING OPTIONAL
* }
* </pre>
*
* We currently ignore the optional parameters and publicKey fields. We
* require that the parameters are encoded as part of the AlgorithmIdentifier,
* not in the private key structure.
*
* @since 1.6
* @author Andreas Sterbenz
*/
public final class ECPrivateKeyImpl extends PKCS8Key implements ECPrivateKey {
private static final long serialVersionUID = 88695385615075129L;
private BigInteger s; // private value
private ECParameterSpec params;
/**
* Construct a key from its encoding. Called by the ECKeyFactory.
*/
public ECPrivateKeyImpl(byte[] encoded) throws InvalidKeyException {
decode(encoded);
}
/**
* Construct a key from its components. Used by the
* KeyFactory.
*/
public ECPrivateKeyImpl(BigInteger s, ECParameterSpec params)
throws InvalidKeyException {
this.s = s;
this.params = params;
// generate the encoding
algid = new AlgorithmId
(AlgorithmId.EC_oid, ECParameters.getAlgorithmParameters(params));
try {
DerOutputStream out = new DerOutputStream();
out.putInteger(1); // version 1
byte[] privBytes = ECUtil.trimZeroes(s.toByteArray());
out.putOctetString(privBytes);
DerValue val =
new DerValue(DerValue.tag_Sequence, out.toByteArray());
key = val.toByteArray();
} catch (IOException exc) {
// should never occur
throw new InvalidKeyException(exc);
}
}
// see JCA doc
public String getAlgorithm() {
return "EC";
}
// see JCA doc
public BigInteger getS() {
return s;
}
// see JCA doc
public ECParameterSpec getParams() {
return params;
}
/**
* Parse the key. Called by PKCS8Key.
*/
protected void parseKeyBits() throws InvalidKeyException {
try {
DerInputStream in = new DerInputStream(key);
DerValue derValue = in.getDerValue();
if (derValue.tag != DerValue.tag_Sequence) {
throw new IOException("Not a SEQUENCE");
}
DerInputStream data = derValue.data;
int version = data.getInteger();
if (version != 1) {
throw new IOException("Version must be 1");
}
byte[] privData = data.getOctetString();
s = new BigInteger(1, privData);
while (data.available() != 0) {
DerValue value = data.getDerValue();
if (value.isContextSpecific((byte)0)) {
// ignore for now
} else if (value.isContextSpecific((byte)1)) {
// ignore for now
} else {
throw new InvalidKeyException("Unexpected value: " + value);
}
}
AlgorithmParameters algParams = this.algid.getParameters();
if (algParams == null) {
throw new InvalidKeyException("EC domain parameters must be "
+ "encoded in the algorithm identifier");
}
params = algParams.getParameterSpec(ECParameterSpec.class);
} catch (IOException e) {
throw new InvalidKeyException("Invalid EC private key", e);
} catch (InvalidParameterSpecException e) {
throw new InvalidKeyException("Invalid EC private key", e);
}
}
}
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