| /* |
| * 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 AES256 |
| * |
| * @author Seema Malkani |
| */ |
| |
| public class HmacSha1Aes256CksumType extends CksumType { |
| |
| public HmacSha1Aes256CksumType() { |
| } |
| |
| public int confounderSize() { |
| return 16; |
| } |
| |
| public int cksumType() { |
| return Checksum.CKSUMTYPE_HMAC_SHA1_96_AES256; |
| } |
| |
| public boolean isSafe() { |
| return true; |
| } |
| |
| public int cksumSize() { |
| return 12; // bytes |
| } |
| |
| public int keyType() { |
| return Krb5.KEYTYPE_AES; |
| } |
| |
| public int keySize() { |
| return 32; // 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 Aes256.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 = Aes256.calculateChecksum(key, usage, data, |
| 0, size); |
| return isChecksumEqual(checksum, newCksum); |
| } catch (GeneralSecurityException e) { |
| KrbCryptoException ke = new KrbCryptoException(e.getMessage()); |
| ke.initCause(e); |
| throw ke; |
| } |
| } |
| } |