Package sun.security.krb5.internal.crypto

Source Code of sun.security.krb5.internal.crypto.HmacSha1Aes128CksumType

/*
* Copyright (c) 2004, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.  Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/

package sun.security.krb5.internal.crypto;

import sun.security.krb5.Checksum;
import sun.security.krb5.KrbCryptoException;
import sun.security.krb5.internal.*;
import javax.crypto.spec.DESKeySpec;
import java.security.InvalidKeyException;
import java.security.GeneralSecurityException;

/*
* This class encapsulates the checksum type for AES128
*
* @author Seema Malkani
*/

public class HmacSha1Aes128CksumType extends CksumType {

    public HmacSha1Aes128CksumType() {
    }

    public int confounderSize() {
        return 16;
    }

    public int cksumType() {
        return Checksum.CKSUMTYPE_HMAC_SHA1_96_AES128;
    }

    public boolean isSafe() {
        return true;
    }

    public int cksumSize() {
        return 12// bytes
    }

    public int keyType() {
        return Krb5.KEYTYPE_AES;
    }

    public int keySize() {
        return 16;   // bytes
    }

    public byte[] calculateChecksum(byte[] data, int size) {
        return null;
    }

    /**
     * Calculates keyed checksum.
     * @param data the data used to generate the checksum.
     * @param size length of the data.
     * @param key the key used to encrypt the checksum.
     * @return keyed checksum.
     */
    public byte[] calculateKeyedChecksum(byte[] data, int size, byte[] key,
        int usage) throws KrbCryptoException {

         try {
            return Aes128.calculateChecksum(key, usage, data, 0, size);
         } catch (GeneralSecurityException e) {
            KrbCryptoException ke = new KrbCryptoException(e.getMessage());
            ke.initCause(e);
            throw ke;
         }
    }

    /**
     * Verifies keyed checksum.
     * @param data the data.
     * @param size the length of data.
     * @param key the key used to encrypt the checksum.
     * @param checksum
     * @return true if verification is successful.
     */
    public boolean verifyKeyedChecksum(byte[] data, int size,
        byte[] key, byte[] checksum, int usage) throws KrbCryptoException {

         try {
            byte[] newCksum = Aes128.calculateChecksum(key, usage,
                                                        data, 0, size);
            return isChecksumEqual(checksum, newCksum);
         } catch (GeneralSecurityException e) {
            KrbCryptoException ke = new KrbCryptoException(e.getMessage());
            ke.initCause(e);
            throw ke;
         }
    }
}
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