gcc/libjava/java/security/Signer.java

/* Signer.java --- Signer Class
   Copyright (C) 1999, 2003, Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
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General Public License for more details.

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permission to link this library with independent modules to produce an
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package java.security;

/**
 * <p>This class is used to represent an {@link Identity} that can also
 * digitally sign data.</p>
 *
 * <p>The management of a signer's private keys is an important and sensitive
 * issue that should be handled by subclasses as appropriate to their intended
 * use.</p>
 *
 * @author Mark Benvenuto (ivymccough@worldnet.att.net)
 * @deprecated This class is no longer used. Its functionality has been replaced
 * by <code>java.security.KeyStore</code>, the <code>java.security.cert</code>
 * package, and <code>java.security.Principal</code>.
 */
public abstract class Signer extends Identity
{
  private static final long serialVersionUID = -1763464102261361480L;
  private PrivateKey privateKey = null;

  /**
   * Creates a <code>Signer</code>. This constructor should only be used for
   * serialization.
   */
  protected Signer()
  {
  }

  /**
   * Creates a <code>Signer</code> with the specified identity name.
   *
   * @param name the identity name.
   */
  public Signer(String name)
  {
    super(name);
  }

  /**
   * Creates a <code>Signer</code> with the specified identity name and scope.
   *
   * @param name the identity name.
   * @param scope the scope of the identity.
   * @throws KeyManagementException if there is already an identity with the
   * same name in the scope.
   */
  public Signer(String name, IdentityScope scope) throws KeyManagementException
  {
    super(name, scope);
  }

  /**
   * <p>Returns this signer's private key.</p>
   *
   * <p>First, if there is a security manager, its <code>checkSecurityAccess()
   * </code> method is called with <code>"getSignerPrivateKey"</code> as its
   * argument to see if it's ok to return the private key.</p>
   *
   * @return this signer's private key, or <code>null</code> if the private key
   * has not yet been set.
   * @throws SecurityException if a security manager exists and its
   * <code>checkSecurityAccess()</code> method doesn't allow returning the
   * private key.
   * @see SecurityManager#checkSecurityAccess(String)
   */
  public PrivateKey getPrivateKey()
  {
    SecurityManager sm = System.getSecurityManager();
    if (sm != null)
      sm.checkSecurityAccess("getSignerPrivateKey");

    return privateKey;
  }

  /**
   * <p>Sets the key pair (public key and private key) for this signer.</p>
   *
   * <p>First, if there is a security manager, its <code>checkSecurityAccess()
   * </code> method is called with <code>"setSignerKeyPair"</code> as its
   * argument to see if it's ok to set the key pair.</p>
   *
   * @param pair an initialized key pair.
   * @throws InvalidParameterException if the key pair is not properly
   * initialized.
   * @throws KeyException if the key pair cannot be set for any other reason.
   * @throws SecurityException if a security manager exists and its
   * <code>checkSecurityAccess()</code> method doesn't allow setting the key
   * pair.
   * @see SecurityManager#checkSecurityAccess(String)
   */
  public final void setKeyPair(KeyPair pair)
    throws InvalidParameterException, KeyException
  {
    SecurityManager sm = System.getSecurityManager();
    if (sm != null)
      sm.checkSecurityAccess("setSignerKeyPair");

    try
      {
        if (pair.getPublic() != null)
          setPublicKey(pair.getPublic());
        else
          throw new InvalidParameterException();

      }
    catch (KeyManagementException kme)
      {
        throw new KeyException();
      }

    if (pair.getPrivate() != null)
        privateKey = pair.getPrivate();
    else
      throw new InvalidParameterException();
  }

  /**
   * Returns a string of information about the signer.
   *
   * @return a string of information about the signer.
   * @see SecurityManager#checkSecurityAccess(String)
   */
  public String toString()
  {
    return (getName() + ": " + privateKey);
  }
}