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.
   */
  
  package android.framework.org.apache.harmony.security_custom.x509;
  
  import java.io.IOException;
  import java.util.Iterator;
  import java.util.List;
  import android.framework.org.apache.harmony.security_custom.asn1.ASN1Oid;
  import android.framework.org.apache.harmony.security_custom.asn1.ASN1SequenceOf;
  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.ObjectIdentifier;
  
  /**
   * Extended Key Usage Extension (OID == 2.5.29.37).
   *
   * The ASN.1 definition for Extended Key Usage Extension is:
   *
   * <pre>
   *  id-ce-extKeyUsage OBJECT IDENTIFIER ::= { id-ce 37 }
   *
   *  ExtKeyUsageSyntax ::= SEQUENCE SIZE (1..MAX) OF KeyPurposeId
   *
   *  KeyPurposeId ::= OBJECT IDENTIFIER
   * </pre>
   * (as specified in RFC 3280  http://www.ietf.org/rfc/rfc3280.txt
   */
  public final class ExtendedKeyUsage extends ExtensionValue {
  
      // the value of extension
      private List<String> keys;
  
      /**
       * Creates the extension object on the base of its encoded form.
       */
      public ExtendedKeyUsage(byte[] encoding) {
          super(encoding);
      }
  
      /**
       * Returns the list of string representation of OIDs corresponding
       * to key purpose IDs.
       */
      public List<String> getExtendedKeyUsage() throws IOException {
          if (keys == null) {
              keys = (List<String>) ASN1.decode(getEncoded());
          }
          return keys;
      }
  
      @Override public byte[] getEncoded() {
          if (encoding == null) {
              encoding = ASN1.encode(keys);
          }
          return encoding;
      }
  
      @Override public void dumpValue(StringBuilder sb, String prefix) {
          sb.append(prefix).append("Extended Key Usage: ");
          if (keys == null) {
              try {
                  keys = getExtendedKeyUsage();
              } catch (IOException e) {
                  // incorrect extension value encoding
                  super.dumpValue(sb);
                  return;
              }
          }
          sb.append('[');
          for (Iterator<?> it = keys.iterator(); it.hasNext();) {
              sb.append(" \"").append(it.next()).append('"');
              if (it.hasNext()) {
                  sb.append(',');
              }
          }
          sb.append(" ]\n");
      }
  
      /**
       * ASN.1 Encoder/Decoder.
       */
      public static final ASN1Type ASN1 = new ASN1SequenceOf(new ASN1Oid() {
          public Object getDecodedObject(BerInputStream in) throws IOException {
              int[] oid = (int[]) super.getDecodedObject(in);
              return ObjectIdentifier.toString(oid);
          }
      });
  }
  