content: /*
   *  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 android.framework.org.apache.harmony.security_custom.x509;
  
  import java.security.KeyFactory;
  import java.security.NoSuchAlgorithmException;
  import java.security.PublicKey;
  import java.security.spec.InvalidKeySpecException;
  import java.security.spec.X509EncodedKeySpec;
  import android.framework.org.apache.harmony.security_custom.asn1.ASN1BitString;
  import android.framework.org.apache.harmony.security_custom.asn1.ASN1Sequence;
  import android.framework.org.apache.harmony.security_custom.asn1.ASN1Type;
  import android.framework.org.apache.harmony.security_custom.asn1.BerInputStream;
  import android.framework.org.apache.harmony.security_custom.asn1.BitString;
  import android.framework.org.apache.harmony.security_custom.utils.AlgNameMapper;
  
  /**
   * 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):
   *
   * <pre>
   *  SubjectPublicKeyInfo  ::=  SEQUENCE  {
   *      algorithm            AlgorithmIdentifier,
   *      subjectPublicKey     BIT STRING
   *  }
   * </pre>
   */
  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) {
              String alg_oid = algorithmID.getAlgorithm();
              try {
                  String alg =
                      AlgNameMapper.map2AlgName(alg_oid);
  
                  if (alg == null) {
                      alg = alg_oid;
                  }
                  publicKey = KeyFactory.getInstance(alg)
                      .generatePublic(new X509EncodedKeySpec(getEncoded()));
              } catch (InvalidKeySpecException ignored) {
              } catch (NoSuchAlgorithmException ignored) {
              }
              if (publicKey == null) {
                  publicKey = new X509PublicKey(alg_oid, getEncoded(),
                          subjectPublicKey);
              }
          }
          return publicKey;
      }
  
      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);
          }
      };
  }
  
  