| /* |
| * 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.util.Arrays; |
| import org.apache.harmony.security.asn1.ASN1Any; |
| import org.apache.harmony.security.asn1.ASN1Oid; |
| 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.ObjectIdentifier; |
| import org.apache.harmony.security.utils.AlgNameMapper; |
| |
| |
| /** |
| * The class encapsulates the ASN.1 DER encoding/decoding work |
| * with the Algorithm Identifier 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): |
| * |
| * <pre> |
| * AlgorithmIdentifier ::= SEQUENCE { |
| * algorithm OBJECT IDENTIFIER, |
| * parameters ANY DEFINED BY algorithm OPTIONAL |
| * } |
| * </pre> |
| */ |
| public final class AlgorithmIdentifier { |
| /** the value of algorithm field */ |
| private String algorithm; |
| /** the name of the algorithm */ |
| private String algorithmName; |
| /** the value of parameters field */ |
| private byte[] parameters; |
| /** the encoding of AlgorithmIdentifier value */ |
| private byte[] encoding; |
| |
| public AlgorithmIdentifier(String algorithm) { |
| this(algorithm, null, null); |
| } |
| |
| public AlgorithmIdentifier(String algorithm, byte[] parameters) { |
| this(algorithm, parameters, null); |
| } |
| |
| private AlgorithmIdentifier(String algorithm, byte[] parameters, byte[] encoding) { |
| this.algorithm = algorithm; |
| this.parameters = parameters; |
| this.encoding = encoding; |
| } |
| |
| /** |
| * For testing when algorithmName is not known, but algorithm OID is. |
| */ |
| public AlgorithmIdentifier(String algorithm, String algorithmName) { |
| this(algorithm, null, null); |
| this.algorithmName = algorithmName; |
| } |
| |
| /** |
| * Returns the value of algorithm field of the structure. |
| */ |
| public String getAlgorithm() { |
| return algorithm; |
| } |
| |
| /** |
| * Returns the name of the algorithm corresponding to |
| * its OID. If there is no the such correspondence, |
| * algorithm OID is returned. |
| */ |
| public String getAlgorithmName() { |
| if (algorithmName == null) { |
| algorithmName = AlgNameMapper.map2AlgName(algorithm); |
| if (algorithmName == null) { |
| algorithmName = algorithm; |
| } |
| } |
| return algorithmName; |
| } |
| |
| /** |
| * Returns the value of parameters field of the structure. |
| */ |
| public byte[] getParameters() { |
| return parameters; |
| } |
| |
| /** |
| * Returns ASN.1 encoded form of this X.509 AlgorithmIdentifier value. |
| */ |
| public byte[] getEncoded() { |
| if (encoding == null) { |
| encoding = ASN1.encode(this); |
| } |
| return encoding; |
| } |
| |
| @Override public boolean equals(Object ai) { |
| if (!(ai instanceof AlgorithmIdentifier)) { |
| return false; |
| } |
| AlgorithmIdentifier algid = (AlgorithmIdentifier) ai; |
| return (algorithm.equals(algid.algorithm)) |
| && ((parameters == null) |
| ? algid.parameters == null |
| : Arrays.equals(parameters, algid.parameters)); |
| } |
| |
| @Override public int hashCode() { |
| return algorithm.hashCode() * 37 + (parameters != null ? Arrays.hashCode(parameters) : 0); |
| } |
| |
| public void dumpValue(StringBuilder sb) { |
| sb.append(getAlgorithmName()); |
| if (parameters == null) { |
| sb.append(", no params, "); |
| } else { |
| sb.append(", params unparsed, "); |
| } |
| sb.append("OID = "); |
| sb.append(getAlgorithm()); |
| } |
| |
| /** |
| * Custom AlgorithmIdentifier DER encoder/decoder |
| */ |
| public static final ASN1Sequence ASN1 = new ASN1Sequence(new ASN1Type[] { |
| ASN1Oid.getInstance(), ASN1Any.getInstance() }) { |
| { |
| setOptional(1); // parameters are optional |
| } |
| |
| @Override protected Object getDecodedObject(BerInputStream in) { |
| Object[] values = (Object[]) in.content; |
| return new AlgorithmIdentifier(ObjectIdentifier |
| .toString((int[]) values[0]), (byte[]) values[1]); |
| } |
| |
| @Override protected void getValues(Object object, Object[] values) { |
| |
| AlgorithmIdentifier aID = (AlgorithmIdentifier) object; |
| |
| values[0] = ObjectIdentifier.toIntArray(aID.getAlgorithm()); |
| values[1] = aID.getParameters(); |
| } |
| }; |
| } |