0N/A/*
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2362N/A * published by the Free Software Foundation. Oracle designates this
0N/A * particular file as subject to the "Classpath" exception as provided
2362N/A * by Oracle in the LICENSE file that accompanied this code.
0N/A *
0N/A * This code is distributed in the hope that it will be useful, but WITHOUT
0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
0N/A * version 2 for more details (a copy is included in the LICENSE file that
0N/A * accompanied this code).
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0N/A * You should have received a copy of the GNU General Public License version
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0N/A *
2362N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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0N/A */
0N/A
0N/Apackage com.sun.crypto.provider;
0N/A
0N/Aimport javax.crypto.KeyGeneratorSpi;
0N/Aimport javax.crypto.SecretKey;
0N/Aimport javax.crypto.spec.DESedeKeySpec;
0N/Aimport java.security.SecureRandom;
0N/Aimport java.security.InvalidParameterException;
0N/Aimport java.security.InvalidAlgorithmParameterException;
0N/Aimport java.security.InvalidKeyException;
0N/Aimport java.security.spec.AlgorithmParameterSpec;
0N/A
0N/A/**
0N/A * This class generates a Triple DES key.
0N/A *
0N/A * @author Jan Luehe
0N/A *
0N/A */
0N/A
0N/Apublic final class DESedeKeyGenerator extends KeyGeneratorSpi {
0N/A
0N/A private SecureRandom random = null;
0N/A private int keysize = 168;
0N/A
0N/A /**
1460N/A * Empty constructor
0N/A */
0N/A public DESedeKeyGenerator() {
0N/A }
0N/A
0N/A /**
0N/A * Initializes this key generator.
0N/A *
0N/A * @param random the source of randomness for this generator
0N/A */
0N/A protected void engineInit(SecureRandom random) {
0N/A this.random = random;
0N/A }
0N/A
0N/A /**
0N/A * Initializes this key generator with the specified parameter
0N/A * set and a user-provided source of randomness.
0N/A *
0N/A * @param params the key generation parameters
0N/A * @param random the source of randomness for this key generator
0N/A *
0N/A * @exception InvalidAlgorithmParameterException if <code>params</code> is
0N/A * inappropriate for this key generator
0N/A */
0N/A protected void engineInit(AlgorithmParameterSpec params,
0N/A SecureRandom random)
0N/A throws InvalidAlgorithmParameterException {
0N/A throw new InvalidAlgorithmParameterException
0N/A ("Triple DES key generation does not take any parameters");
0N/A }
0N/A
0N/A /**
0N/A * Initializes this key generator for a certain keysize, using the given
0N/A * source of randomness.
0N/A *
0N/A * @param keysize the keysize. This is an algorithm-specific
0N/A * metric specified in number of bits. A keysize with 112 bits of entropy
0N/A * corresponds to a Triple DES key with 2 intermediate keys, and a keysize
0N/A * with 168 bits of entropy corresponds to a Triple DES key with 3
0N/A * intermediate keys.
0N/A * @param random the source of randomness for this key generator
0N/A */
0N/A protected void engineInit(int keysize, SecureRandom random) {
0N/A if ((keysize != 112) && (keysize != 168)) {
0N/A throw new InvalidParameterException("Wrong keysize: must be "
0N/A + "equal to 112 or 168");
0N/A }
0N/A this.keysize = keysize;
0N/A this.engineInit(random);
0N/A }
0N/A
0N/A /**
0N/A * Generates the Triple DES key.
0N/A *
0N/A * @return the new Triple DES key
0N/A */
0N/A protected SecretKey engineGenerateKey() {
0N/A if (this.random == null) {
0N/A this.random = SunJCE.RANDOM;
0N/A }
0N/A
0N/A byte[] rawkey = new byte[DESedeKeySpec.DES_EDE_KEY_LEN];
0N/A
0N/A if (keysize == 168) {
0N/A // 3 intermediate keys
0N/A this.random.nextBytes(rawkey);
0N/A
0N/A // Do parity adjustment for each intermediate key
0N/A DESKeyGenerator.setParityBit(rawkey, 0);
0N/A DESKeyGenerator.setParityBit(rawkey, 8);
0N/A DESKeyGenerator.setParityBit(rawkey, 16);
0N/A } else {
0N/A // 2 intermediate keys
0N/A byte[] tmpkey = new byte[16];
0N/A this.random.nextBytes(tmpkey);
0N/A DESKeyGenerator.setParityBit(tmpkey, 0);
0N/A DESKeyGenerator.setParityBit(tmpkey, 8);
0N/A System.arraycopy(tmpkey, 0, rawkey, 0, tmpkey.length);
0N/A // Copy the first 8 bytes into the last
0N/A System.arraycopy(tmpkey, 0, rawkey, 16, 8);
0N/A java.util.Arrays.fill(tmpkey, (byte)0x00);
0N/A }
0N/A
0N/A DESedeKey desEdeKey = null;
0N/A try {
0N/A desEdeKey = new DESedeKey(rawkey);
0N/A } catch (InvalidKeyException ike) {
0N/A // this never happens
0N/A throw new RuntimeException(ike.getMessage());
0N/A }
0N/A
0N/A java.util.Arrays.fill(rawkey, (byte)0x00);
0N/A
0N/A return desEdeKey;
0N/A }
0N/A}