iaik.pkcs.pkcs11.objects.RSAPublicKey Maven / Gradle / Ivy

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package iaik.pkcs.pkcs11.objects;

import iaik.pkcs.pkcs11.Session;
import iaik.pkcs.pkcs11.TokenException;
import iaik.pkcs.pkcs11.Util;

/**
 * Objects of this class represent RSA public keys as specified by PKCS#11
 * v2.11.
 *
 * @author Karl Scheibelhofer
 * @version 1.0
 */
// CHECKSTYLE:SKIP
public class RSAPublicKey extends PublicKey {

  /**
   * The modulus (n) of this RSA key.
   */
  protected ByteArrayAttribute modulus;

  /**
   * The public exponent (e) of this RSA key.
   */
  protected ByteArrayAttribute publicExponent;

  /**
   * The bit-length of the modulus of this RSA key.
   */
  protected LongAttribute modulusBits;

  /**
   * Default Constructor.
   */
  public RSAPublicKey() {
    super();
    keyType.setLongValue(KeyType.RSA);
  }

  /**
   * Called by getInstance to create an instance of a PKCS#11 RSA public key.
   *
   * @param session
   *          The session to use for reading attributes. This session must
   *          have the appropriate rights; i.e. it must be a user-session, if
   *          it is a private object.
   * @param objectHandle
   *          The object handle as given from the PKCS#111 module.
   * @exception TokenException
   *              If getting the attributes failed.
   */
  protected RSAPublicKey(Session session, long objectHandle)
      throws TokenException {
    super(session, objectHandle);
    keyType.setLongValue(KeyType.RSA);
  }

  /**
   * The getInstance method of the PublicKey class uses this method to create
   * an instance of a PKCS#11 RSA public key.
   *
   * @param session
   *          The session to use for reading attributes. This session must
   *          have the appropriate rights; i.e. it must be a user-session, if
   *          it is a private object.
   * @param objectHandle
   *          The object handle as given from the PKCS#111 module.
   * @return The object representing the PKCS#11 object.
   *         The returned object can be casted to the
   *         according sub-class.
   * @exception TokenException
   *              If getting the attributes failed.
   */
  public static PKCS11Object getInstance(Session session, long objectHandle)
      throws TokenException {
    return new RSAPublicKey(session, objectHandle);
  }

  /**
   * Put all attributes of the given object into the attributes table of this
   * object. This method is only static to be able to access invoke the
   * implementation of this method for each class separately.
   *
   * @param object
   *          The object to handle.
   */
  protected static void putAttributesInTable(RSAPublicKey object) {
    Util.requireNonNull("object", object);
    object.attributeTable.put(Attribute.MODULUS, object.modulus);
    object.attributeTable.put(Attribute.PUBLIC_EXPONENT,
        object.publicExponent);
    object.attributeTable.put(Attribute.MODULUS_BITS, object.modulusBits);
  }

  /**
   * Allocates the attribute objects for this class and adds them to the
   * attribute table.
   */
  @Override
  protected void allocateAttributes() {
    super.allocateAttributes();

    modulus = new ByteArrayAttribute(Attribute.MODULUS);
    publicExponent = new ByteArrayAttribute(Attribute.PUBLIC_EXPONENT);
    modulusBits = new LongAttribute(Attribute.MODULUS_BITS);

    putAttributesInTable(this);
  }

  /**
   * Compares all member variables of this object with the other object.
   * Returns only true, if all are equal in both objects.
   *
   * @param otherObject
   *          The other object to compare to.
   * @return True, if other is an instance of this class and all member
   *         variables of both objects are equal. False, otherwise.
   */
  @Override
  public boolean equals(Object otherObject) {
    if (this == otherObject) {
      return true;
    } else if (!(otherObject instanceof RSAPublicKey)) {
      return false;
    }

    RSAPublicKey other = (RSAPublicKey) otherObject;
    return super.equals(other)
        && this.modulus.equals(other.modulus)
        && this.publicExponent.equals(other.publicExponent)
        && this.modulusBits.equals(other.modulusBits);
  }

  /**
   * Gets the modulus attribute of this RSA key.
   *
   * @return The modulus attribute.
   */
  public ByteArrayAttribute getModulus() {
    return modulus;
  }

  /**
   * Gets the public exponent attribute of this RSA key.
   *
   * @return The public exponent attribute.
   */
  public ByteArrayAttribute getPublicExponent() {
    return publicExponent;
  }

  /**
   * Gets the modulus bits (bit-length of the modulus) attribute of this RSA
   * key.
   *
   * @return The public exponent attribute.
   */
  public LongAttribute getModulusBits() {
    return modulusBits;
  }

  /**
   * Read the values of the attributes of this object from the token.
   *
   * @param session
   *          The session to use for reading attributes. This session must
   *          have the appropriate rights; i.e. it must be a user-session, if
   *          it is a private object.
   * @exception TokenException
   *              If getting the attributes failed.
   */
  @Override
  public void readAttributes(Session session) throws TokenException {
    super.readAttributes(session);

    PKCS11Object.getAttributeValues(session, objectHandle, new Attribute[] {
        modulus, publicExponent, modulusBits });
  }

  /**
   * Returns a string representation of the current object. The
   * output is only for debugging purposes and should not be used for other
   * purposes.
   *
   * @return A string presentation of this object for debugging output.
   */
  @Override
  public String toString() {
    String superToString = super.toString();
    return Util.concatObjectsCap(superToString.length() + 100, superToString,
        "\n  Modulus (hex): ", modulus,
        "\n  Public Exponent (hex): ", publicExponent,
        "\n  Modulus Bits (dec): ", modulusBits.toString(10));
  }

}