author | weijun |
Thu, 24 Jun 2010 14:26:28 +0800 | |
changeset 5974 | f0531b7dfebe |
parent 5506 | 202f599c92aa |
child 7977 | f47f211cd627 |
permissions | -rw-r--r-- |
2 | 1 |
/* |
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* Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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/* |
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* |
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* (C) Copyright IBM Corp. 1999 All Rights Reserved. |
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* Copyright 1997 The Open Group Research Institute. All rights reserved. |
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*/ |
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package sun.security.krb5.internal.crypto; |
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import sun.security.krb5.internal.*; |
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import sun.security.krb5.Config; |
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import sun.security.krb5.EncryptedData; |
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import sun.security.krb5.EncryptionKey; |
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import sun.security.krb5.KrbException; |
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import sun.security.krb5.KrbCryptoException; |
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import javax.crypto.*; |
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import java.util.Arrays; |
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import java.util.List; |
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import java.util.ArrayList; |
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//only needed if dataSize() implementation changes back to spec; |
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//see dataSize() below |
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public abstract class EType { |
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private static final boolean DEBUG = Krb5.DEBUG; |
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private static final boolean ALLOW_WEAK_CRYPTO; |
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static { |
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boolean allowed = true; |
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try { |
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Config cfg = Config.getInstance(); |
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String temp = cfg.getDefault("allow_weak_crypto", "libdefaults"); |
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if (temp != null && temp.equals("false")) allowed = false; |
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} catch (Exception exc) { |
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if (DEBUG) { |
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System.out.println ("Exception in getting allow_weak_crypto, " + |
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"using default value " + |
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exc.getMessage()); |
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} |
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} |
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ALLOW_WEAK_CRYPTO = allowed; |
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} |
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public static EType getInstance (int eTypeConst) |
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throws KdcErrException { |
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EType eType = null; |
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String eTypeName = null; |
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switch (eTypeConst) { |
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case EncryptedData.ETYPE_NULL: |
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eType = new NullEType(); |
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eTypeName = "sun.security.krb5.internal.crypto.NullEType"; |
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break; |
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case EncryptedData.ETYPE_DES_CBC_CRC: |
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eType = new DesCbcCrcEType(); |
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eTypeName = "sun.security.krb5.internal.crypto.DesCbcCrcEType"; |
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break; |
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case EncryptedData.ETYPE_DES_CBC_MD5: |
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eType = new DesCbcMd5EType(); |
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eTypeName = "sun.security.krb5.internal.crypto.DesCbcMd5EType"; |
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break; |
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case EncryptedData.ETYPE_DES3_CBC_HMAC_SHA1_KD: |
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eType = new Des3CbcHmacSha1KdEType(); |
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eTypeName = |
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"sun.security.krb5.internal.crypto.Des3CbcHmacSha1KdEType"; |
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break; |
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case EncryptedData.ETYPE_AES128_CTS_HMAC_SHA1_96: |
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eType = new Aes128CtsHmacSha1EType(); |
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eTypeName = |
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"sun.security.krb5.internal.crypto.Aes128CtsHmacSha1EType"; |
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break; |
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case EncryptedData.ETYPE_AES256_CTS_HMAC_SHA1_96: |
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eType = new Aes256CtsHmacSha1EType(); |
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eTypeName = |
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"sun.security.krb5.internal.crypto.Aes256CtsHmacSha1EType"; |
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break; |
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case EncryptedData.ETYPE_ARCFOUR_HMAC: |
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eType = new ArcFourHmacEType(); |
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eTypeName = "sun.security.krb5.internal.crypto.ArcFourHmacEType"; |
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break; |
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default: |
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String msg = "encryption type = " + toString(eTypeConst) |
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+ " (" + eTypeConst + ")"; |
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throw new KdcErrException(Krb5.KDC_ERR_ETYPE_NOSUPP, msg); |
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} |
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if (DEBUG) { |
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System.out.println(">>> EType: " + eTypeName); |
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} |
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return eType; |
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} |
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public abstract int eType(); |
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public abstract int minimumPadSize(); |
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public abstract int confounderSize(); |
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public abstract int checksumType(); |
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public abstract int checksumSize(); |
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public abstract int blockSize(); |
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public abstract int keyType(); |
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public abstract int keySize(); |
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public abstract byte[] encrypt(byte[] data, byte[] key, int usage) |
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throws KrbCryptoException; |
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public abstract byte[] encrypt(byte[] data, byte[] key, byte[] ivec, |
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int usage) throws KrbCryptoException; |
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public abstract byte[] decrypt(byte[] cipher, byte[] key, int usage) |
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throws KrbApErrException, KrbCryptoException; |
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public abstract byte[] decrypt(byte[] cipher, byte[] key, byte[] ivec, |
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int usage) throws KrbApErrException, KrbCryptoException; |
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public int dataSize(byte[] data) |
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// throws Asn1Exception |
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{ |
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// EncodeRef ref = new EncodeRef(data, startOfData()); |
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// return ref.end - startOfData(); |
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// should be the above according to spec, but in fact |
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// implementations include the pad bytes in the data size |
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return data.length - startOfData(); |
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} |
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public int padSize(byte[] data) { |
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return data.length - confounderSize() - checksumSize() - |
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dataSize(data); |
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} |
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public int startOfChecksum() { |
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return confounderSize(); |
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} |
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public int startOfData() { |
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return confounderSize() + checksumSize(); |
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} |
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public int startOfPad(byte[] data) { |
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return confounderSize() + checksumSize() + dataSize(data); |
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} |
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public byte[] decryptedData(byte[] data) { |
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int tempSize = dataSize(data); |
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byte[] result = new byte[tempSize]; |
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System.arraycopy(data, startOfData(), result, 0, tempSize); |
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return result; |
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} |
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// Note: the first 2 entries of BUILTIN_ETYPES and BUILTIN_ETYPES_NOAES256 |
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// should be kept DES-related. They will be removed when allow_weak_crypto |
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// is set to false. |
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private static final int[] BUILTIN_ETYPES = new int[] { |
5974
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6844907: krb5 etype order should be from strong to weak
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EncryptedData.ETYPE_AES256_CTS_HMAC_SHA1_96, |
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EncryptedData.ETYPE_AES128_CTS_HMAC_SHA1_96, |
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EncryptedData.ETYPE_DES3_CBC_HMAC_SHA1_KD, |
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EncryptedData.ETYPE_ARCFOUR_HMAC, |
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EncryptedData.ETYPE_DES_CBC_CRC, |
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EncryptedData.ETYPE_DES_CBC_MD5, |
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}; |
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private static final int[] BUILTIN_ETYPES_NOAES256 = new int[] { |
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EncryptedData.ETYPE_AES128_CTS_HMAC_SHA1_96, |
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EncryptedData.ETYPE_DES3_CBC_HMAC_SHA1_KD, |
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EncryptedData.ETYPE_ARCFOUR_HMAC, |
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EncryptedData.ETYPE_DES_CBC_CRC, |
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EncryptedData.ETYPE_DES_CBC_MD5, |
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}; |
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// used in Config |
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public static int[] getBuiltInDefaults() { |
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int allowed = 0; |
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try { |
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allowed = Cipher.getMaxAllowedKeyLength("AES"); |
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} catch (Exception e) { |
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// should not happen |
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} |
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int[] result; |
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if (allowed < 256) { |
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result = BUILTIN_ETYPES_NOAES256; |
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} else { |
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result = BUILTIN_ETYPES; |
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} |
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if (!ALLOW_WEAK_CRYPTO) { |
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parents:
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// The last 2 etypes are now weak ones |
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parents:
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return Arrays.copyOfRange(result, 0, result.length - 2); |
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} |
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return result; |
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} |
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/** |
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* Retrieves the default etypes from the configuration file, or |
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* if that's not available, return the built-in list of default etypes. |
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*/ |
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// used in KrbAsReq, KeyTab |
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public static int[] getDefaults(String configName) { |
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try { |
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return Config.getInstance().defaultEtype(configName); |
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} catch (KrbException exc) { |
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if (DEBUG) { |
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System.out.println("Exception while getting " + |
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configName + exc.getMessage()); |
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System.out.println("Using default builtin etypes"); |
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} |
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return getBuiltInDefaults(); |
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} |
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} |
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/** |
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* Retrieve the default etypes from the configuration file for |
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* those etypes for which there are corresponding keys. |
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* Used in scenario we have some keys from a keytab with etypes |
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* different from those named in configName. Then, in order |
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* to decrypt an AS-REP, we should only ask for etypes for which |
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* we have keys. |
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*/ |
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public static int[] getDefaults(String configName, EncryptionKey[] keys) |
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throws KrbException { |
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int[] answer = getDefaults(configName); |
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if (answer == null) { |
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throw new KrbException("No supported encryption types listed in " |
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+ configName); |
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} |
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List<Integer> list = new ArrayList<Integer> (answer.length); |
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for (int i = 0; i < answer.length; i++) { |
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if (EncryptionKey.findKey(answer[i], keys) != null) { |
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list.add(answer[i]); |
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} |
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} |
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int len = list.size(); |
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if (len <= 0) { |
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StringBuffer keystr = new StringBuffer(); |
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for (int i = 0; i < keys.length; i++) { |
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keystr.append(toString(keys[i].getEType())); |
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keystr.append(" "); |
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} |
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throw new KrbException( |
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"Do not have keys of types listed in " + configName + |
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" available; only have keys of following type: " + |
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keystr.toString()); |
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} else { |
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answer = new int[len]; |
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for (int i = 0; i < len; i++) { |
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answer[i] = list.get(i); |
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} |
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return answer; |
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} |
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} |
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285 |
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286 |
public static boolean isSupported(int eTypeConst, int[] config) { |
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for (int i = 0; i < config.length; i++) { |
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288 |
if (eTypeConst == config[i]) { |
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return true; |
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} |
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} |
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return false; |
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} |
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294 |
||
295 |
public static boolean isSupported(int eTypeConst) { |
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296 |
int[] enabledETypes = getBuiltInDefaults(); |
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297 |
return isSupported(eTypeConst, enabledETypes); |
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} |
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299 |
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300 |
public static String toString(int type) { |
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301 |
switch (type) { |
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302 |
case 0: |
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303 |
return "NULL"; |
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304 |
case 1: |
|
305 |
return "DES CBC mode with CRC-32"; |
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306 |
case 2: |
|
307 |
return "DES CBC mode with MD4"; |
|
308 |
case 3: |
|
309 |
return "DES CBC mode with MD5"; |
|
310 |
case 4: |
|
311 |
return "reserved"; |
|
312 |
case 5: |
|
313 |
return "DES3 CBC mode with MD5"; |
|
314 |
case 6: |
|
315 |
return "reserved"; |
|
316 |
case 7: |
|
317 |
return "DES3 CBC mode with SHA1"; |
|
318 |
case 9: |
|
319 |
return "DSA with SHA1- Cms0ID"; |
|
320 |
case 10: |
|
321 |
return "MD5 with RSA encryption - Cms0ID"; |
|
322 |
case 11: |
|
323 |
return "SHA1 with RSA encryption - Cms0ID"; |
|
324 |
case 12: |
|
325 |
return "RC2 CBC mode with Env0ID"; |
|
326 |
case 13: |
|
327 |
return "RSA encryption with Env0ID"; |
|
328 |
case 14: |
|
329 |
return "RSAES-0AEP-ENV-0ID"; |
|
330 |
case 15: |
|
331 |
return "DES-EDE3-CBC-ENV-0ID"; |
|
332 |
case 16: |
|
333 |
return "DES3 CBC mode with SHA1-KD"; |
|
334 |
case 17: |
|
335 |
return "AES128 CTS mode with HMAC SHA1-96"; |
|
336 |
case 18: |
|
337 |
return "AES256 CTS mode with HMAC SHA1-96"; |
|
338 |
case 23: |
|
339 |
return "RC4 with HMAC"; |
|
340 |
case 24: |
|
341 |
return "RC4 with HMAC EXP"; |
|
342 |
||
343 |
} |
|
344 |
return "Unknown (" + type + ")"; |
|
345 |
} |
|
346 |
} |