android-34/sun/security/x509/BasicConstraintsExtension.java - platform/prebuilts/fullsdk/sources - Git at Google

 /*
  * Copyright (c) 1997, 2009, 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
  * particular file as subject to the "Classpath" exception as provided
  * by Oracle in the LICENSE file that accompanied this code.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */

 package sun.security.x509;

 import java.io.IOException;
 import java.io.OutputStream;
 import java.util.Enumeration;

 import sun.security.util.*;

 /**
  * This class represents the Basic Constraints Extension.
  *
  * <p>The basic constraints extension identifies whether the subject of the
  * certificate is a CA and how deep a certification path may exist
  * through that CA.
  *
  * <pre>
  * The ASN.1 syntax for this extension is:
  * BasicConstraints ::= SEQUENCE {
  *     cA                BOOLEAN DEFAULT FALSE,
  *     pathLenConstraint INTEGER (0..MAX) OPTIONAL
  * }
  * </pre>
  * @author Amit Kapoor
  * @author Hemma Prafullchandra
  * @see CertAttrSet
  * @see Extension
  */
 public class BasicConstraintsExtension extends Extension
 implements CertAttrSet<String> {
     /**
      * Identifier for this attribute, to be used with the
      * get, set, delete methods of Certificate, x509 type.
      */
     public static final String IDENT = "x509.info.extensions.BasicConstraints";
     /**
      * Attribute names.
      */
     public static final String NAME = "BasicConstraints";
     public static final String IS_CA = "is_ca";
     public static final String PATH_LEN = "path_len";

     // Private data members
     private boolean     ca = false;
     private int pathLen = -1;

     // Encode this extension value
     private void encodeThis() throws IOException {
         DerOutputStream out = new DerOutputStream();
         DerOutputStream tmp = new DerOutputStream();

         if (ca) {
             tmp.putBoolean(ca);
             // Only encode pathLen when ca == true
             if (pathLen >= 0) {
                 tmp.putInteger(pathLen);
             }
         }
         out.write(DerValue.tag_Sequence, tmp);
         this.extensionValue = out.toByteArray();
     }

     /**
      * Default constructor for this object. The extension is marked
      * critical if the ca flag is true, false otherwise.
      *
      * @param ca true, if the subject of the Certificate is a CA.
      * @param len specifies the depth of the certification path.
      */
     public BasicConstraintsExtension(boolean ca, int len) throws IOException {
         this(Boolean.valueOf(ca), ca, len);
     }

     /**
      * Constructor for this object with specified criticality.
      *
      * @param critical true, if the extension should be marked critical
      * @param ca true, if the subject of the Certificate is a CA.
      * @param len specifies the depth of the certification path.
      */
     public BasicConstraintsExtension(Boolean critical, boolean ca, int len)
     throws IOException {
         this.ca = ca;
         this.pathLen = len;
         this.extensionId = PKIXExtensions.BasicConstraints_Id;
         this.critical = critical.booleanValue();
         encodeThis();
     }

     /**
      * Create the extension from the passed DER encoded value of the same.
      *
      * @param critical flag indicating if extension is critical or not
      * @param value an array containing the DER encoded bytes of the extension.
      * @exception ClassCastException if value is not an array of bytes
      * @exception IOException on error.
      */
      public BasicConstraintsExtension(Boolean critical, Object value)
          throws IOException
     {
          this.extensionId = PKIXExtensions.BasicConstraints_Id;
          this.critical = critical.booleanValue();

          this.extensionValue = (byte[]) value;
          DerValue val = new DerValue(this.extensionValue);
          if (val.tag != DerValue.tag_Sequence) {
              throw new IOException("Invalid encoding of BasicConstraints");
          }

          if (val.data == null || val.data.available() == 0) {
              // non-CA cert ("cA" field is FALSE by default), return -1
              return;
          }
          DerValue opt = val.data.getDerValue();
          if (opt.tag != DerValue.tag_Boolean) {
              // non-CA cert ("cA" field is FALSE by default), return -1
              return;
          }

          this.ca = opt.getBoolean();
          if (val.data.available() == 0) {
              // From PKIX profile:
              // Where pathLenConstraint does not appear, there is no
              // limit to the allowed length of the certification path.
              this.pathLen = Integer.MAX_VALUE;
              return;
          }

          opt = val.data.getDerValue();
          if (opt.tag != DerValue.tag_Integer) {
              throw new IOException("Invalid encoding of BasicConstraints");
          }
          this.pathLen = opt.getInteger();
          /*
           * Activate this check once again after PKIX profiling
           * is a standard and this check no longer imposes an
           * interoperability barrier.
           * if (ca) {
           *   if (!this.critical) {
           *   throw new IOException("Criticality cannot be false for CA.");
           *   }
           * }
           */
      }

      /**
       * Return user readable form of extension.
       */
      public String toString() {
          String s = super.toString() + "BasicConstraints:[\n";

          s += ((ca) ? ("  CA:true") : ("  CA:false")) + "\n";
          if (pathLen >= 0) {
              s += "  PathLen:" + pathLen + "\n";
          } else {
              s += "  PathLen: undefined\n";
          }
          return (s + "]\n");
      }

      /**
       * Encode this extension value to the output stream.
       *
       * @param out the DerOutputStream to encode the extension to.
       */
      public void encode(OutputStream out) throws IOException {
          DerOutputStream tmp = new DerOutputStream();
          if (extensionValue == null) {
              this.extensionId = PKIXExtensions.BasicConstraints_Id;
              if (ca) {
                  critical = true;
              } else {
                  critical = false;
              }
              encodeThis();
          }
          super.encode(tmp);

          out.write(tmp.toByteArray());
      }

     /**
      * Set the attribute value.
      */
     public void set(String name, Object obj) throws IOException {
         if (name.equalsIgnoreCase(IS_CA)) {
             if (!(obj instanceof Boolean)) {
               throw new IOException("Attribute value should be of type Boolean.");
             }
             ca = ((Boolean)obj).booleanValue();
         } else if (name.equalsIgnoreCase(PATH_LEN)) {
             if (!(obj instanceof Integer)) {
               throw new IOException("Attribute value should be of type Integer.");
             }
             pathLen = ((Integer)obj).intValue();
         } else {
           throw new IOException("Attribute name not recognized by " +
                                 "CertAttrSet:BasicConstraints.");
         }
         encodeThis();
     }

     /**
      * Get the attribute value.
      */
     public Object get(String name) throws IOException {
         if (name.equalsIgnoreCase(IS_CA)) {
             return (Boolean.valueOf(ca));
         } else if (name.equalsIgnoreCase(PATH_LEN)) {
             return (Integer.valueOf(pathLen));
         } else {
           throw new IOException("Attribute name not recognized by " +
                                 "CertAttrSet:BasicConstraints.");
         }
     }

     /**
      * Delete the attribute value.
      */
     public void delete(String name) throws IOException {
         if (name.equalsIgnoreCase(IS_CA)) {
             ca = false;
         } else if (name.equalsIgnoreCase(PATH_LEN)) {
             pathLen = -1;
         } else {
           throw new IOException("Attribute name not recognized by " +
                                 "CertAttrSet:BasicConstraints.");
         }
         encodeThis();
     }

     /**
      * Return an enumeration of names of attributes existing within this
      * attribute.
      */
     public Enumeration<String> getElements() {
         AttributeNameEnumeration elements = new AttributeNameEnumeration();
         elements.addElement(IS_CA);
         elements.addElement(PATH_LEN);

         return (elements.elements());
     }

     /**
      * Return the name of this attribute.
      */
     public String getName() {
         return (NAME);
     }
 }
	/*
	* Copyright (c) 1997, 2009, 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
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	package sun.security.x509;

	import java.io.IOException;
	import java.io.OutputStream;
	import java.util.Enumeration;

	import sun.security.util.*;

	/**
	* This class represents the Basic Constraints Extension.
	*
	* <p>The basic constraints extension identifies whether the subject of the
	* certificate is a CA and how deep a certification path may exist
	* through that CA.
	*
	* <pre>
	* The ASN.1 syntax for this extension is:
	* BasicConstraints ::= SEQUENCE {
	* cA BOOLEAN DEFAULT FALSE,
	* pathLenConstraint INTEGER (0..MAX) OPTIONAL
	* }
	* </pre>
	* @author Amit Kapoor
	* @author Hemma Prafullchandra
	* @see CertAttrSet
	* @see Extension
	*/
	public class BasicConstraintsExtension extends Extension
	implements CertAttrSet<String> {
	/**
	* Identifier for this attribute, to be used with the
	* get, set, delete methods of Certificate, x509 type.
	*/
	public static final String IDENT = "x509.info.extensions.BasicConstraints";
	/**
	* Attribute names.
	*/
	public static final String NAME = "BasicConstraints";
	public static final String IS_CA = "is_ca";
	public static final String PATH_LEN = "path_len";

	// Private data members
	private boolean ca = false;
	private int pathLen = -1;

	// Encode this extension value
	private void encodeThis() throws IOException {
	DerOutputStream out = new DerOutputStream();
	DerOutputStream tmp = new DerOutputStream();

	if (ca) {
	tmp.putBoolean(ca);
	// Only encode pathLen when ca == true
	if (pathLen >= 0) {
	tmp.putInteger(pathLen);
	}
	}
	out.write(DerValue.tag_Sequence, tmp);
	this.extensionValue = out.toByteArray();
	}

	/**
	* Default constructor for this object. The extension is marked
	* critical if the ca flag is true, false otherwise.
	*
	* @param ca true, if the subject of the Certificate is a CA.
	* @param len specifies the depth of the certification path.
	*/
	public BasicConstraintsExtension(boolean ca, int len) throws IOException {
	this(Boolean.valueOf(ca), ca, len);
	}

	/**
	* Constructor for this object with specified criticality.
	*
	* @param critical true, if the extension should be marked critical
	* @param ca true, if the subject of the Certificate is a CA.
	* @param len specifies the depth of the certification path.
	*/
	public BasicConstraintsExtension(Boolean critical, boolean ca, int len)
	throws IOException {
	this.ca = ca;
	this.pathLen = len;
	this.extensionId = PKIXExtensions.BasicConstraints_Id;
	this.critical = critical.booleanValue();
	encodeThis();
	}

	/**
	* Create the extension from the passed DER encoded value of the same.
	*
	* @param critical flag indicating if extension is critical or not
	* @param value an array containing the DER encoded bytes of the extension.
	* @exception ClassCastException if value is not an array of bytes
	* @exception IOException on error.
	*/
	public BasicConstraintsExtension(Boolean critical, Object value)
	throws IOException
	{
	this.extensionId = PKIXExtensions.BasicConstraints_Id;
	this.critical = critical.booleanValue();

	this.extensionValue = (byte[]) value;
	DerValue val = new DerValue(this.extensionValue);
	if (val.tag != DerValue.tag_Sequence) {
	throw new IOException("Invalid encoding of BasicConstraints");
	}

	if (val.data == null \|\| val.data.available() == 0) {
	// non-CA cert ("cA" field is FALSE by default), return -1
	return;
	}
	DerValue opt = val.data.getDerValue();
	if (opt.tag != DerValue.tag_Boolean) {
	// non-CA cert ("cA" field is FALSE by default), return -1
	return;
	}

	this.ca = opt.getBoolean();
	if (val.data.available() == 0) {
	// From PKIX profile:
	// Where pathLenConstraint does not appear, there is no
	// limit to the allowed length of the certification path.
	this.pathLen = Integer.MAX_VALUE;
	return;
	}

	opt = val.data.getDerValue();
	if (opt.tag != DerValue.tag_Integer) {
	throw new IOException("Invalid encoding of BasicConstraints");
	}
	this.pathLen = opt.getInteger();
	/*
	* Activate this check once again after PKIX profiling
	* is a standard and this check no longer imposes an
	* interoperability barrier.
	* if (ca) {
	* if (!this.critical) {
	* throw new IOException("Criticality cannot be false for CA.");
	* }
	* }
	*/
	}

	/**
	* Return user readable form of extension.
	*/
	public String toString() {
	String s = super.toString() + "BasicConstraints:[\n";

	s += ((ca) ? (" CA:true") : (" CA:false")) + "\n";
	if (pathLen >= 0) {
	s += " PathLen:" + pathLen + "\n";
	} else {
	s += " PathLen: undefined\n";
	}
	return (s + "]\n");
	}

	/**
	* Encode this extension value to the output stream.
	*
	* @param out the DerOutputStream to encode the extension to.
	*/
	public void encode(OutputStream out) throws IOException {
	DerOutputStream tmp = new DerOutputStream();
	if (extensionValue == null) {
	this.extensionId = PKIXExtensions.BasicConstraints_Id;
	if (ca) {
	critical = true;
	} else {
	critical = false;
	}
	encodeThis();
	}
	super.encode(tmp);

	out.write(tmp.toByteArray());
	}

	/**
	* Set the attribute value.
	*/
	public void set(String name, Object obj) throws IOException {
	if (name.equalsIgnoreCase(IS_CA)) {
	if (!(obj instanceof Boolean)) {
	throw new IOException("Attribute value should be of type Boolean.");
	}
	ca = ((Boolean)obj).booleanValue();
	} else if (name.equalsIgnoreCase(PATH_LEN)) {
	if (!(obj instanceof Integer)) {
	throw new IOException("Attribute value should be of type Integer.");
	}
	pathLen = ((Integer)obj).intValue();
	} else {
	throw new IOException("Attribute name not recognized by " +
	"CertAttrSet:BasicConstraints.");
	}
	encodeThis();
	}

	/**
	* Get the attribute value.
	*/
	public Object get(String name) throws IOException {
	if (name.equalsIgnoreCase(IS_CA)) {
	return (Boolean.valueOf(ca));
	} else if (name.equalsIgnoreCase(PATH_LEN)) {
	return (Integer.valueOf(pathLen));
	} else {
	throw new IOException("Attribute name not recognized by " +
	"CertAttrSet:BasicConstraints.");
	}
	}

	/**
	* Delete the attribute value.
	*/
	public void delete(String name) throws IOException {
	if (name.equalsIgnoreCase(IS_CA)) {
	ca = false;
	} else if (name.equalsIgnoreCase(PATH_LEN)) {
	pathLen = -1;
	} else {
	throw new IOException("Attribute name not recognized by " +
	"CertAttrSet:BasicConstraints.");
	}
	encodeThis();
	}

	/**
	* Return an enumeration of names of attributes existing within this
	* attribute.
	*/
	public Enumeration<String> getElements() {
	AttributeNameEnumeration elements = new AttributeNameEnumeration();
	elements.addElement(IS_CA);
	elements.addElement(PATH_LEN);

	return (elements.elements());
	}

	/**
	* Return the name of this attribute.
	*/
	public String getName() {
	return (NAME);
	}
	}