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Signer.java
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1998-09-22
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/*
* @(#)Signer.java 1.24 98/07/01
*
* Copyright 1995-1998 by Sun Microsystems, Inc.,
* 901 San Antonio Road, Palo Alto, California, 94303, U.S.A.
* All rights reserved.
*
* This software is the confidential and proprietary information
* of Sun Microsystems, Inc. ("Confidential Information"). You
* shall not disclose such Confidential Information and shall use
* it only in accordance with the terms of the license agreement
* you entered into with Sun.
*/
package java.security;
import java.io.*;
/**
* This class is used to represent an Identity that can also digitally
* sign data.
*
* <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.
*
* @see Identity
*
* @version 1.22, 01/31/97
* @author Benjamin Renaud
*/
public abstract class Signer extends Identity {
private PrivateKey privateKey;
/**
* Creates a signer. This constructor should only be used for
* serialization.
*/
protected Signer() {
super();
}
/**
* Creates a signer with the specified identity name.
*
* @param name the identity name.
*/
public Signer(String name) {
super(name);
}
/**
* Creates a signer with the specified identity name and scope.
*
* @param name the identity name.
*
* @param scope the scope of the identity.
*
* @exception 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);
}
/**
* Returns this signer's private key.
*
* @return this signer's private key, or null if the private key has
* not yet been set.
*/
public PrivateKey getPrivateKey() {
check("get.private.key");
return privateKey;
}
/**
* Sets the key pair (public key and private key) for this signer.
*
* @param pair an initialized key pair.
*
* @exception InvalidParameterException if the key pair is not
* properly initialized.
* @exception KeyException if the key pair cannot be set for any
* other reason.
*/
public final void setKeyPair(KeyPair pair)
throws InvalidParameterException, KeyException {
check("set.private.keypair");
PublicKey pub = pair.getPublic();
PrivateKey priv = pair.getPrivate();
if (pub == null || priv == null) {
throw new InvalidParameterException();
}
setPublicKey(pub);
privateKey = priv;
}
String printKeys() {
String keys = "";
PublicKey publicKey = getPublicKey();
if (publicKey != null && privateKey != null) {
keys = "\tpublic and private keys initialized";
} else {
keys = "\tno keys";
}
return keys;
}
/**
* Returns a string of information about the signer.
*
* @return a string of information about the signer.
*/
public String toString() {
return "[Signer]" + super.toString();
}
}