author | darcy |
Thu, 29 Aug 2019 10:52:21 -0700 | |
changeset 57950 | 4612a3cfb927 |
parent 47216 | 71c04702a3d5 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1996, 2019, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package sun.security.provider; |
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import java.util.*; |
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import java.io.*; |
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import java.math.BigInteger; |
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import java.security.InvalidKeyException; |
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import java.security.ProviderException; |
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import java.security.AlgorithmParameters; |
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import java.security.spec.DSAParameterSpec; |
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import java.security.spec.InvalidParameterSpecException; |
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import java.security.interfaces.DSAParams; |
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import sun.security.x509.X509Key; |
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import sun.security.x509.AlgIdDSA; |
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import sun.security.util.BitArray; |
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import sun.security.util.Debug; |
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import sun.security.util.DerValue; |
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import sun.security.util.DerInputStream; |
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import sun.security.util.DerOutputStream; |
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/** |
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* An X.509 public key for the Digital Signature Algorithm. |
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* |
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* @author Benjamin Renaud |
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* |
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* |
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* @see DSAPrivateKey |
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* @see AlgIdDSA |
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* @see DSA |
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*/ |
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public class DSAPublicKey extends X509Key |
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implements java.security.interfaces.DSAPublicKey, Serializable { |
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/** use serialVersionUID from JDK 1.1. for interoperability */ |
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@java.io.Serial |
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private static final long serialVersionUID = -2994193307391104133L; |
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/* the public key */ |
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private BigInteger y; |
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/* |
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* Keep this constructor for backwards compatibility with JDK1.1. |
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*/ |
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public DSAPublicKey() { |
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} |
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/** |
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* Make a DSA public key out of a public key and three parameters. |
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* The p, q, and g parameters may be null, but if so, parameters will need |
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* to be supplied from some other source before this key can be used in |
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* cryptographic operations. PKIX RFC2459bis explicitly allows DSA public |
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* keys without parameters, where the parameters are provided in the |
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* issuer's DSA public key. |
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* |
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* @param y the actual key bits |
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* @param p DSA parameter p, may be null if all of p, q, and g are null. |
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* @param q DSA parameter q, may be null if all of p, q, and g are null. |
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* @param g DSA parameter g, may be null if all of p, q, and g are null. |
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*/ |
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public DSAPublicKey(BigInteger y, BigInteger p, BigInteger q, |
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BigInteger g) |
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throws InvalidKeyException { |
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this.y = y; |
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algid = new AlgIdDSA(p, q, g); |
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try { |
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byte[] keyArray = new DerValue(DerValue.tag_Integer, |
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y.toByteArray()).toByteArray(); |
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setKey(new BitArray(keyArray.length*8, keyArray)); |
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encode(); |
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} catch (IOException e) { |
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throw new InvalidKeyException("could not DER encode y: " + |
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e.getMessage()); |
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} |
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} |
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/** |
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* Make a DSA public key from its DER encoding (X.509). |
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*/ |
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public DSAPublicKey(byte[] encoded) throws InvalidKeyException { |
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decode(encoded); |
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} |
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/** |
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* Returns the DSA parameters associated with this key, or null if the |
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* parameters could not be parsed. |
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*/ |
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public DSAParams getParams() { |
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try { |
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if (algid instanceof DSAParams) { |
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return (DSAParams)algid; |
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} else { |
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DSAParameterSpec paramSpec; |
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AlgorithmParameters algParams = algid.getParameters(); |
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if (algParams == null) { |
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return null; |
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} |
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paramSpec = algParams.getParameterSpec(DSAParameterSpec.class); |
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return (DSAParams)paramSpec; |
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} |
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} catch (InvalidParameterSpecException e) { |
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return null; |
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} |
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} |
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/** |
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* Get the raw public value, y, without the parameters. |
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* |
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* @see getParameters |
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*/ |
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public BigInteger getY() { |
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return y; |
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} |
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public String toString() { |
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return "Sun DSA Public Key\n Parameters:" + algid |
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+ "\n y:\n" + Debug.toHexString(y) + "\n"; |
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} |
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protected void parseKeyBits() throws InvalidKeyException { |
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try { |
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DerInputStream in = new DerInputStream(getKey().toByteArray()); |
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y = in.getBigInteger(); |
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} catch (IOException e) { |
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throw new InvalidKeyException("Invalid key: y value\n" + |
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e.getMessage()); |
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} |
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} |
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} |