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 android.framework.org.apache.harmony.security_custom.asn1.ASN1BitString;
  import android.framework.org.apache.harmony.security_custom.asn1.ASN1Type;
  
  /**
   * Key Usage Extension (OID = 2.5.29.15).
   *
   * The ASN.1 definition for Key Usage Extension is:
   *
   * <pre>
   * id-ce-keyUsage OBJECT IDENTIFIER ::=  { id-ce 15 }
   *
   * KeyUsage ::= BIT STRING {
   *     digitalSignature        (0),
   *     nonRepudiation          (1),
   *     keyEncipherment         (2),
   *     dataEncipherment        (3),
   *     keyAgreement            (4),
   *     keyCertSign             (5),
   *     cRLSign                 (6),
   *     encipherOnly            (7),
   *     decipherOnly            (8)
   * }
   * </pre>
   * (as specified in RFC 3280 http://www.ietf.org/rfc/rfc3280.txt)
   */
  public final class KeyUsage extends ExtensionValue {
  
      /** The names of the usages. */
      private static final String[] USAGES = {
          "digitalSignature",
          "nonRepudiation",
          "keyEncipherment",
          "dataEncipherment",
          "keyAgreement",
          "keyCertSign",
          "cRLSign",
          "encipherOnly",
          "decipherOnly",
      };
  
      /** the value of extension */
      private final boolean[] keyUsage;
  
      /**
       * Creates the extension object on the base of its encoded form.
       */
      public KeyUsage(byte[] encoding) throws IOException {
          super(encoding);
          this.keyUsage = (boolean[]) ASN1.decode(encoding);
      }
  
      public boolean[] getKeyUsage() {
          return keyUsage;
      }
  
      @Override public byte[] getEncoded() {
          if (encoding == null) {
              encoding = ASN1.encode(keyUsage);
          }
          return encoding;
      }
  
      @Override public void dumpValue(StringBuilder sb, String prefix) {
          sb.append(prefix).append("KeyUsage [\n");
          for (int i = 0; i < keyUsage.length; i++) {
              if (keyUsage[i]) {
                  sb.append(prefix).append("  ").append(USAGES[i]).append('\n');
              }
          }
          sb.append(prefix).append("]\n");
      }
  
      /**
       * X.509 Extension value encoder/decoder.
       */
      private static final ASN1Type ASN1 = new ASN1BitString.ASN1NamedBitList(9);
  
  }
  