/*
* Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
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*/
package java.security;
import java.io.*;
import java.util.Locale;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.security.spec.InvalidKeySpecException;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.SecretKeySpec;
/**
* Standardized representation for serialized Key objects.
*
* <p>
*
* Note that a serialized Key may contain sensitive information
* which should not be exposed in untrusted environments. See the
* <a href="../../../platform/serialization/spec/security.html">
* Security Appendix</a>
* of the Serialization Specification for more information.
*
* @see Key
* @see KeyFactory
* @see javax.crypto.spec.SecretKeySpec
* @see java.security.spec.X509EncodedKeySpec
* @see java.security.spec.PKCS8EncodedKeySpec
*
* @since 1.5
*/
public class KeyRep implements Serializable {
private static final long serialVersionUID = -4757683898830641853L;
/**
* Key type.
*
* @since 1.5
*/
public static enum Type {
/** Type for secret keys. */
SECRET,
/** Type for public keys. */
PUBLIC,
/** Type for private keys. */
PRIVATE,
}
private static final String PKCS8 = "PKCS#8";
private static final String X509 = "X.509";
private static final String RAW = "RAW";
/**
* Either one of Type.SECRET, Type.PUBLIC, or Type.PRIVATE
*
* @serial
*/
private Type type;
/**
* The Key algorithm
*
* @serial
*/
private String algorithm;
/**
* The Key encoding format
*
* @serial
*/
private String format;
/**
* The encoded Key bytes
*
* @serial
*/
private byte[] encoded;
/**
* Construct the alternate Key class.
*
* <p>
*
* @param type either one of Type.SECRET, Type.PUBLIC, or Type.PRIVATE
* @param algorithm the algorithm returned from
* {@code Key.getAlgorithm()}
* @param format the encoding format returned from
* {@code Key.getFormat()}
* @param encoded the encoded bytes returned from
* {@code Key.getEncoded()}
*
* @exception NullPointerException
* if type is {@code null},
* if algorithm is {@code null},
* if format is {@code null},
* or if encoded is {@code null}
*/
public KeyRep(Type type, String algorithm,
String format, byte[] encoded) {
if (type == null || algorithm == null ||
format == null || encoded == null) {
throw new NullPointerException("invalid null input(s)");
}
this.type = type;
this.algorithm = algorithm;
this.format = format.toUpperCase(Locale.ENGLISH);
this.encoded = encoded.clone();
}
/**
* Resolve the Key object.
*
* <p> This method supports three Type/format combinations:
* <ul>
* <li> Type.SECRET/"RAW" - returns a SecretKeySpec object
* constructed using encoded key bytes and algorithm
* <li> Type.PUBLIC/"X.509" - gets a KeyFactory instance for
* the key algorithm, constructs an X509EncodedKeySpec with the
* encoded key bytes, and generates a public key from the spec
* <li> Type.PRIVATE/"PKCS#8" - gets a KeyFactory instance for
* the key algorithm, constructs a PKCS8EncodedKeySpec with the
* encoded key bytes, and generates a private key from the spec
* </ul>
*
* <p>
*
* @return the resolved Key object
*
* @exception ObjectStreamException if the Type/format
* combination is unrecognized, if the algorithm, key format, or
* encoded key bytes are unrecognized/invalid, of if the
* resolution of the key fails for any reason
*/
protected Object readResolve() throws ObjectStreamException {
try {
if (type == Type.SECRET && RAW.equals(format)) {
return new SecretKeySpec(encoded, algorithm);
} else if (type == Type.PUBLIC && X509.equals(format)) {
KeyFactory f = KeyFactory.getInstance(algorithm);
return f.generatePublic(new X509EncodedKeySpec(encoded));
} else if (type == Type.PRIVATE && PKCS8.equals(format)) {
KeyFactory f = KeyFactory.getInstance(algorithm);
return f.generatePrivate(new PKCS8EncodedKeySpec(encoded));
} else {
throw new NotSerializableException
("unrecognized type/format combination: " +
type + "/" + format);
}
} catch (NotSerializableException nse) {
throw nse;
} catch (Exception e) {
NotSerializableException nse = new NotSerializableException
("java.security.Key: " +
"[" + type + "] " +
"[" + algorithm + "] " +
"[" + format + "]");
nse.initCause(e);
throw nse;
}
}
}