All Downloads are FREE. Search and download functionalities are using the official Maven repository.

org.apache.harmony.security.x509.SubjectPublicKeyInfo Maven / Gradle / Ivy

Go to download

A library jar that provides APIs for Applications written for the Google Android Platform.

There is a newer version: 14-robolectric-10818077
Show newest version
/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

/**
* @author Alexander Y. Kleymenov
* @version $Revision$
*/

package org.apache.harmony.security.x509;

import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.PublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.KeySpec;
import java.security.spec.X509EncodedKeySpec;
import org.apache.harmony.security.asn1.ASN1BitString;
import org.apache.harmony.security.asn1.ASN1Sequence;
import org.apache.harmony.security.asn1.ASN1Type;
import org.apache.harmony.security.asn1.BerInputStream;
import org.apache.harmony.security.asn1.BitString;

/**
 * The class encapsulates the ASN.1 DER encoding/decoding work
 * with the following structure which is a part of X.509 certificate
 * (as specified in RFC 3280 -
 *  Internet X.509 Public Key Infrastructure.
 *  Certificate and Certificate Revocation List (CRL) Profile.
 *  http://www.ietf.org/rfc/rfc3280.txt):
 *
 * 
 *  SubjectPublicKeyInfo  ::=  SEQUENCE  {
 *      algorithm            AlgorithmIdentifier,
 *      subjectPublicKey     BIT STRING
 *  }
 * 
*/ public final class SubjectPublicKeyInfo { /** the value of algorithmID field of the structure */ private AlgorithmIdentifier algorithmID; /** the value of subjectPublicKey field of the structure */ private byte[] subjectPublicKey; /** the public key corresponding to this SubjectPublicKeyInfo */ private PublicKey publicKey; /** the value of unusedBits field of the structure */ private int unusedBits; /** the ASN.1 encoded form of SubjectPublicKeyInfo */ private byte[] encoding; public SubjectPublicKeyInfo(AlgorithmIdentifier algID, byte[] subjectPublicKey) { this(algID, subjectPublicKey, 0); } public SubjectPublicKeyInfo(AlgorithmIdentifier algID, byte[] subjectPublicKey, int unused) { this(algID, subjectPublicKey, 0, null); } private SubjectPublicKeyInfo(AlgorithmIdentifier algID, byte[] subjectPublicKey, int unused, byte[] encoding) { this.algorithmID = algID; this.subjectPublicKey = subjectPublicKey; this.unusedBits = unused; this.encoding = encoding; } /** * Returns the value of algorithmIdentifier field of the structure. */ public AlgorithmIdentifier getAlgorithmIdentifier() { return algorithmID; } /** * Returns the value of subjectPublicKey field of the structure. */ public byte[] getSubjectPublicKey() { return subjectPublicKey; } /** * Returns ASN.1 encoded form of this X.509 SubjectPublicKeyInfo value. */ public byte[] getEncoded() { if (encoding == null) { encoding = ASN1.encode(this); } return encoding; } /** * Returns the PublicKey corresponding to this SubjectPublicKeyInfo * instance. */ public PublicKey getPublicKey() { if (publicKey == null) { final byte[] encoded = getEncoded(); final KeySpec keySpec = new X509EncodedKeySpec(encoded); /* Try using the algorithm name first. */ final String algName = algorithmID.getAlgorithmName(); publicKey = generateKeyForAlgorithm(keySpec, algName); /* * Fall back to using the algorithm OID if it's not the same as the * algorithm name. */ final String algOid = algorithmID.getAlgorithm(); if (publicKey == null && !algOid.equals(algName)) { publicKey = generateKeyForAlgorithm(keySpec, algOid); } /* * Encode this as an X.509 public key since we didn't have any * KeyFactory that could handle this algorithm name or OID. Perhaps * the thing that's using this can decode it. */ if (publicKey == null) { publicKey = new X509PublicKey(algOid, encoded, subjectPublicKey); } } return publicKey; } /** * Try to generate a PublicKey for a given {@code keySpec} and * {@code algorithm} identifier. If there a problem generating the key like * a missing {@code KeyFactory} or invalid {@code KeySpec}, it will return * {@code null}. */ private static PublicKey generateKeyForAlgorithm(KeySpec keySpec, String algorithm) { try { return KeyFactory.getInstance(algorithm).generatePublic(keySpec); } catch (InvalidKeySpecException ignored) { } catch (NoSuchAlgorithmException ignored) { } return null; } public static final ASN1Sequence ASN1 = new ASN1Sequence(new ASN1Type[] { AlgorithmIdentifier.ASN1, ASN1BitString.getInstance() }) { @Override protected Object getDecodedObject(BerInputStream in) { Object[] values = (Object[]) in.content; return new SubjectPublicKeyInfo( (AlgorithmIdentifier) values[0], ((BitString) values[1]).bytes, ((BitString) values[1]).unusedBits, in.getEncoded()); } @Override protected void getValues(Object object, Object[] values) { SubjectPublicKeyInfo spki = (SubjectPublicKeyInfo) object; values[0] = spki.algorithmID; values[1] = new BitString(spki.subjectPublicKey, spki.unusedBits); } }; }




© 2015 - 2024 Weber Informatics LLC | Privacy Policy