1/*
2 * Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26package sun.security.krb5.internal.crypto;
27
28import sun.security.krb5.EncryptedData;
29import sun.security.krb5.internal.crypto.dk.ArcFourCrypto;
30import sun.security.krb5.KrbCryptoException;
31import java.security.GeneralSecurityException;
32
33/**
34 * Class with static methods for doing RC4-HMAC operations.
35 *
36 * @author Seema Malkani
37 */
38
39public class ArcFourHmac {
40    private static final ArcFourCrypto CRYPTO = new ArcFourCrypto(128);
41
42    private ArcFourHmac() {
43    }
44
45    public static byte[] stringToKey(char[] password)
46        throws GeneralSecurityException {
47        return CRYPTO.stringToKey(password);
48    }
49
50    // in bytes
51    public static int getChecksumLength() {
52        return CRYPTO.getChecksumLength();
53    }
54
55    public static byte[] calculateChecksum(byte[] baseKey, int usage,
56        byte[] input, int start, int len) throws GeneralSecurityException {
57            return CRYPTO.calculateChecksum(baseKey, usage, input, start, len);
58    }
59
60    /* Encrypt Sequence Number */
61    public static byte[] encryptSeq(byte[] baseKey, int usage,
62        byte[] checksum, byte[] plaintext, int start, int len)
63        throws GeneralSecurityException, KrbCryptoException {
64        return CRYPTO.encryptSeq(baseKey, usage, checksum, plaintext, start, len);
65    }
66
67    /* Decrypt Sequence Number */
68    public static byte[] decryptSeq(byte[] baseKey, int usage, byte[] checksum,
69        byte[] ciphertext, int start, int len)
70        throws GeneralSecurityException, KrbCryptoException {
71        return CRYPTO.decryptSeq(baseKey, usage, checksum, ciphertext, start, len);
72    }
73
74    public static byte[] encrypt(byte[] baseKey, int usage,
75        byte[] ivec, byte[] plaintext, int start, int len)
76        throws GeneralSecurityException, KrbCryptoException {
77            return CRYPTO.encrypt(baseKey, usage, ivec, null /* new_ivec */,
78                plaintext, start, len);
79    }
80
81    /* Encrypt plaintext; do not add confounder, or checksum */
82    public static byte[] encryptRaw(byte[] baseKey, int usage,
83        byte[] seqNum, byte[] plaintext, int start, int len)
84        throws GeneralSecurityException, KrbCryptoException {
85        return CRYPTO.encryptRaw(baseKey, usage, seqNum, plaintext, start, len);
86    }
87
88    public static byte[] decrypt(byte[] baseKey, int usage, byte[] ivec,
89        byte[] ciphertext, int start, int len)
90        throws GeneralSecurityException {
91        return CRYPTO.decrypt(baseKey, usage, ivec, ciphertext, start, len);
92    }
93
94    /* Decrypt ciphertext; do not remove confounder, or check checksum */
95    public static byte[] decryptRaw(byte[] baseKey, int usage, byte[] ivec,
96        byte[] ciphertext, int start, int len, byte[] seqNum)
97        throws GeneralSecurityException {
98        return CRYPTO.decryptRaw(baseKey, usage, ivec, ciphertext, start, len, seqNum);
99    }
100};
101