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package com.sun.crypto.provider;

import java.security.MessageDigest;
import java.security.KeyRep;
import java.security.InvalidKeyException;
import javax.crypto.SecretKey;
import javax.crypto.spec.DESKeySpec;

This class represents a DES key.
Author:Jan Luehe
/** * This class represents a DES key. * * @author Jan Luehe * */
final class DESKey implements SecretKey { static final long serialVersionUID = 7724971015953279128L; private byte[] key;
Uses the first 8 bytes of the given key as the DES key.
Params:
  • key – the buffer with the DES key bytes.
Throws:
/** * Uses the first 8 bytes of the given key as the DES key. * * @param key the buffer with the DES key bytes. * * @exception InvalidKeyException if less than 8 bytes are available for * the key. */
DESKey(byte[] key) throws InvalidKeyException { this(key, 0); }
Uses the first 8 bytes in key, beginning at offset, as the DES key
Params:
  • key – the buffer with the DES key bytes.
  • offset – the offset in key, where the DES key bytes start.
Throws:
/** * Uses the first 8 bytes in <code>key</code>, beginning at * <code>offset</code>, as the DES key * * @param key the buffer with the DES key bytes. * @param offset the offset in <code>key</code>, where the DES key bytes * start. * * @exception InvalidKeyException if less than 8 bytes are available for * the key. */
DESKey(byte[] key, int offset) throws InvalidKeyException { if (key == null || key.length - offset < DESKeySpec.DES_KEY_LEN) { throw new InvalidKeyException("Wrong key size"); } this.key = new byte[DESKeySpec.DES_KEY_LEN]; System.arraycopy(key, offset, this.key, 0, DESKeySpec.DES_KEY_LEN); DESKeyGenerator.setParityBit(this.key, 0); } public synchronized byte[] getEncoded() { // Return a copy of the key, rather than a reference, // so that the key data cannot be modified from outside return this.key.clone(); } public String getAlgorithm() { return "DES"; } public String getFormat() { return "RAW"; }
Calculates a hash code value for the object. Objects that are equal will also have the same hashcode.
/** * Calculates a hash code value for the object. * Objects that are equal will also have the same hashcode. */
public int hashCode() { int retval = 0; for (int i = 1; i < this.key.length; i++) { retval += this.key[i] * i; } return(retval ^= "des".hashCode()); } public boolean equals(Object obj) { if (this == obj) return true; if (!(obj instanceof SecretKey)) return false; String thatAlg = ((SecretKey)obj).getAlgorithm(); if (!(thatAlg.equalsIgnoreCase("DES"))) return false; byte[] thatKey = ((SecretKey)obj).getEncoded(); boolean ret = MessageDigest.isEqual(this.key, thatKey); java.util.Arrays.fill(thatKey, (byte)0x00); return ret; }
readObject is called to restore the state of this key from a stream.
/** * readObject is called to restore the state of this key from * a stream. */
private void readObject(java.io.ObjectInputStream s) throws java.io.IOException, ClassNotFoundException { s.defaultReadObject(); key = key.clone(); }
Replace the DES key to be serialized.
Throws:
Returns:the standard KeyRep object to be serialized
/** * Replace the DES key to be serialized. * * @return the standard KeyRep object to be serialized * * @throws java.io.ObjectStreamException if a new object representing * this DES key could not be created */
private Object writeReplace() throws java.io.ObjectStreamException { return new KeyRep(KeyRep.Type.SECRET, getAlgorithm(), getFormat(), getEncoded()); }
Ensures that the bytes of this key are set to zero when there are no more references to it.
/** * Ensures that the bytes of this key are * set to zero when there are no more references to it. */
protected void finalize() throws Throwable { try { synchronized (this) { if (this.key != null) { java.util.Arrays.fill(this.key, (byte)0x00); this.key = null; } } } finally { super.finalize(); } } }