src/java.security.jgss/share/classes/sun/security/krb5/internal/PAData.java

*** 1,7 ****
  /*
!  * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
--- 1,7 ----
  /*
!  * Copyright (c) 2017, 2018 Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
*** 33,42 ****
--- 33,44 ----
  
  import sun.security.krb5.internal.crypto.EType;
  import sun.security.util.*;
  import sun.security.krb5.Asn1Exception;
  import java.io.IOException;
+ import java.util.Vector;
+ 
  import sun.security.krb5.internal.util.KerberosString;
  
  /**
   * Implements the ASN.1 PA-DATA type.
   *
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      public byte[] getValue() {
          return ((pADataValue == null) ? null : pADataValue.clone());
      }
  
      /**
+      * Parse (unmarshal) a PAData from a DER input stream.  This form
+      * parsing might be used when expanding a value which is part of
+      * a constructed sequence and uses explicitly tagged type.
+      *
+      * @exception Asn1Exception if an Asn1Exception occurs.
+      * @param data the Der input stream value, which contains one or more
+      *        marshaled values.
+      * @param explicitTag tag number.
+      * @param optional indicates if this data field is optional.
+      * @return an array of PAData.
+      */
+     public static PAData[] parseSequence(DerInputStream data,
+                                       byte explicitTag, boolean optional)
+         throws Asn1Exception, IOException {
+         if ((optional) &&
+                 (((byte)data.peekByte() & (byte)0x1F) != explicitTag))
+                 return null;
+         DerValue subDer = data.getDerValue();
+         DerValue subsubDer = subDer.getData().getDerValue();
+         if (subsubDer.getTag() != DerValue.tag_SequenceOf) {
+             throw new Asn1Exception(Krb5.ASN1_BAD_ID);
+         }
+         Vector<PAData> v = new Vector<>();
+         while (subsubDer.getData().available() > 0) {
+             v.addElement(new PAData(subsubDer.getData().getDerValue()));
+         }
+         if (v.size() > 0) {
+             PAData[] pas = new PAData[v.size()];
+             v.copyInto(pas);
+             return pas;
+         }
+         return null;
+     }
+ 
+     /**
       * Gets the preferred etype from the PAData array.
       * <ol>
       * <li>ETYPE-INFO2-ENTRY with unknown s2kparams ignored</li>
       * <li>ETYPE-INFO2 preferred to ETYPE-INFO</li>
       * <li>Multiple entries for same etype in one PA-DATA, use the first one.</li>