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package com.sun.crypto.provider;

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

import jdk.internal.ref.CleanerFactory;

This class represents a DES key.
Author:Jan Luehe
/** * This class represents a DES key. * * @author Jan Luehe * */
final class DESKey implements SecretKey { @java.io.Serial 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); // Use the cleaner to zero the key when no longer referenced final byte[] k = this.key; CleanerFactory.cleaner().register(this, () -> java.util.Arrays.fill(k, (byte)0x00)); } public byte[] getEncoded() { // Return a copy of the key, rather than a reference, // so that the key data cannot be modified from outside // The key is zeroized by finalize() // The reachability fence ensures finalize() isn't called early byte[] result = key.clone(); Reference.reachabilityFence(this); return result; } 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. */
@java.io.Serial 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 */
@java.io.Serial private Object writeReplace() throws java.io.ObjectStreamException { return new KeyRep(KeyRep.Type.SECRET, getAlgorithm(), getFormat(), getEncoded()); } }