J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2005 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package sun.security.krb5.internal.crypto; |
| 27 | |
| 28 | import sun.security.krb5.KrbCryptoException; |
| 29 | import sun.security.krb5.internal.*; |
| 30 | import java.security.GeneralSecurityException; |
| 31 | import sun.security.krb5.EncryptedData; |
| 32 | import sun.security.krb5.Checksum; |
| 33 | |
| 34 | /* |
| 35 | * This class encapsulates the encryption type for RC4-HMAC |
| 36 | * |
| 37 | * @author Seema Malkani |
| 38 | */ |
| 39 | |
| 40 | public final class ArcFourHmacEType extends EType { |
| 41 | |
| 42 | public int eType() { |
| 43 | return EncryptedData.ETYPE_ARCFOUR_HMAC; |
| 44 | } |
| 45 | |
| 46 | public int minimumPadSize() { |
| 47 | return 1; |
| 48 | } |
| 49 | |
| 50 | public int confounderSize() { |
| 51 | return 8; |
| 52 | } |
| 53 | |
| 54 | public int checksumType() { |
| 55 | return Checksum.CKSUMTYPE_HMAC_MD5_ARCFOUR; |
| 56 | } |
| 57 | |
| 58 | public int checksumSize() { |
| 59 | return ArcFourHmac.getChecksumLength(); |
| 60 | } |
| 61 | |
| 62 | public int blockSize() { |
| 63 | return 1; |
| 64 | } |
| 65 | |
| 66 | public int keyType() { |
| 67 | return Krb5.KEYTYPE_ARCFOUR_HMAC; |
| 68 | } |
| 69 | |
| 70 | public int keySize() { |
| 71 | return 16; // bytes |
| 72 | } |
| 73 | |
| 74 | public byte[] encrypt(byte[] data, byte[] key, int usage) |
| 75 | throws KrbCryptoException { |
| 76 | byte[] ivec = new byte[blockSize()]; |
| 77 | return encrypt(data, key, ivec, usage); |
| 78 | } |
| 79 | |
| 80 | public byte[] encrypt(byte[] data, byte[] key, byte[] ivec, int usage) |
| 81 | throws KrbCryptoException { |
| 82 | try { |
| 83 | return ArcFourHmac.encrypt(key, usage, ivec, data, 0, data.length); |
| 84 | } catch (GeneralSecurityException e) { |
| 85 | KrbCryptoException ke = new KrbCryptoException(e.getMessage()); |
| 86 | ke.initCause(e); |
| 87 | throw ke; |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | public byte[] decrypt(byte[] cipher, byte[] key, int usage) |
| 92 | throws KrbApErrException, KrbCryptoException { |
| 93 | byte[] ivec = new byte[blockSize()]; |
| 94 | return decrypt(cipher, key, ivec, usage); |
| 95 | } |
| 96 | |
| 97 | public byte[] decrypt(byte[] cipher, byte[] key, byte[] ivec, int usage) |
| 98 | throws KrbApErrException, KrbCryptoException { |
| 99 | try { |
| 100 | return ArcFourHmac.decrypt(key, usage, ivec, cipher, 0, cipher.length); |
| 101 | } catch (GeneralSecurityException e) { |
| 102 | KrbCryptoException ke = new KrbCryptoException(e.getMessage()); |
| 103 | ke.initCause(e); |
| 104 | throw ke; |
| 105 | } |
| 106 | } |
| 107 | |
| 108 | // Override default, because our decrypted data does not return confounder |
| 109 | // Should eventually get rid of EType.decryptedData and |
| 110 | // EncryptedData.decryptedData altogether |
| 111 | public byte[] decryptedData(byte[] data) { |
| 112 | return data; |
| 113 | } |
| 114 | } |