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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.DESedeKeySpec;

This class represents a DES-EDE key.
Author:Jan Luehe
/** * This class represents a DES-EDE key. * * @author Jan Luehe * */
final class DESedeKey implements SecretKey { static final long serialVersionUID = 2463986565756745178L; private byte[] key;
Creates a DES-EDE key from a given key.
Params:
  • key – the given key
Throws:
/** * Creates a DES-EDE key from a given key. * * @param key the given key * * @exception InvalidKeyException if the given key has a wrong size */
DESedeKey(byte[] key) throws InvalidKeyException { this(key, 0); }
Uses the first 24 bytes in key, beginning at offset, as the DES-EDE key
Params:
  • key – the buffer with the DES-EDE key
  • offset – the offset in key, where the DES-EDE key starts
Throws:
/** * Uses the first 24 bytes in <code>key</code>, beginning at * <code>offset</code>, as the DES-EDE key * * @param key the buffer with the DES-EDE key * @param offset the offset in <code>key</code>, where the DES-EDE key * starts * * @exception InvalidKeyException if the given key has a wrong size */
DESedeKey(byte[] key, int offset) throws InvalidKeyException { if (key==null || ((key.length-offset)<DESedeKeySpec.DES_EDE_KEY_LEN)) { throw new InvalidKeyException("Wrong key size"); } this.key = new byte[DESedeKeySpec.DES_EDE_KEY_LEN]; System.arraycopy(key, offset, this.key, 0, DESedeKeySpec.DES_EDE_KEY_LEN); DESKeyGenerator.setParityBit(this.key, 0); DESKeyGenerator.setParityBit(this.key, 8); DESKeyGenerator.setParityBit(this.key, 16); } public synchronized byte[] getEncoded() { return this.key.clone(); } public String getAlgorithm() { return "DESede"; } 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 ^= "desede".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("DESede")) && !(thatAlg.equalsIgnoreCase("TripleDES"))) 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 DESede key to be serialized.
Throws:
Returns:the standard KeyRep object to be serialized
/** * Replace the DESede key to be serialized. * * @return the standard KeyRep object to be serialized * * @throws java.io.ObjectStreamException if a new object representing * this DESede 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(); } } }