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annotate app/src/main/java/ch/ethz/ssh2/crypto/cipher/BlockCipherFactory.java @ 512:e1dd1fd46e18
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| author | Carl Byington <carl@five-ten-sg.com> |
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| date | Fri, 10 Feb 2023 14:32:41 -0700 |
| parents | d29cce60f393 |
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| rev | line source |
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1 /* |
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2 * Copyright (c) 2006-2011 Christian Plattner. All rights reserved. |
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3 * Please refer to the LICENSE.txt for licensing details. |
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4 */ |
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5 package ch.ethz.ssh2.crypto.cipher; |
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6 |
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7 import java.util.ArrayList; |
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8 import java.util.List; |
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9 import java.util.Vector; |
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10 |
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11 /** |
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12 * BlockCipherFactory. |
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13 * |
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14 * @author Christian Plattner |
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15 * @version $Id: BlockCipherFactory.java 86 2014-04-07 14:15:18Z dkocher@sudo.ch $ |
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16 */ |
| 307 | 17 public class BlockCipherFactory { |
| 18 private static final class CipherEntry { | |
| 19 String type; | |
| 20 int blocksize; | |
| 21 int keysize; | |
| 22 String cipherClass; | |
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23 |
| 307 | 24 public CipherEntry(String type, int blockSize, int keySize, String cipherClass) { |
| 25 this.type = type; | |
| 26 this.blocksize = blockSize; | |
| 27 this.keysize = keySize; | |
| 28 this.cipherClass = cipherClass; | |
| 29 } | |
| 30 } | |
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31 |
| 307 | 32 private static final List<CipherEntry> ciphers = new ArrayList<CipherEntry>(); |
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33 |
| 307 | 34 static { |
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35 // Higher priority (stronger) first |
| 307 | 36 ciphers.add(new CipherEntry("aes256-ctr", 16, 32, "ch.ethz.ssh2.crypto.cipher.AES")); |
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37 ciphers.add(new CipherEntry("aes192-ctr", 16, 24, "ch.ethz.ssh2.crypto.cipher.AES")); |
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38 ciphers.add(new CipherEntry("aes128-ctr", 16, 16, "ch.ethz.ssh2.crypto.cipher.AES")); |
| 307 | 39 ciphers.add(new CipherEntry("blowfish-ctr", 8, 16, "ch.ethz.ssh2.crypto.cipher.BlowFish")); |
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40 ciphers.add(new CipherEntry("aes256-cbc", 16, 32, "ch.ethz.ssh2.crypto.cipher.AES")); |
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41 ciphers.add(new CipherEntry("aes192-cbc", 16, 24, "ch.ethz.ssh2.crypto.cipher.AES")); |
| 307 | 42 ciphers.add(new CipherEntry("aes128-cbc", 16, 16, "ch.ethz.ssh2.crypto.cipher.AES")); |
| 43 ciphers.add(new CipherEntry("blowfish-cbc", 8, 16, "ch.ethz.ssh2.crypto.cipher.BlowFish")); | |
| 44 ciphers.add(new CipherEntry("3des-ctr", 8, 24, "ch.ethz.ssh2.crypto.cipher.DESede")); | |
| 45 ciphers.add(new CipherEntry("3des-cbc", 8, 24, "ch.ethz.ssh2.crypto.cipher.DESede")); | |
| 46 } | |
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47 |
| 307 | 48 public static String[] getDefaultCipherList() { |
| 49 List<String> list = new ArrayList<String>(ciphers.size()); | |
| 50 | |
| 51 for (CipherEntry ce : ciphers) { | |
| 52 list.add(ce.type); | |
| 53 } | |
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54 |
| 307 | 55 return list.toArray(new String[ciphers.size()]); |
| 56 } | |
| 57 | |
| 58 public static void checkCipherList(String[] cipherCandidates) { | |
| 59 for (String cipherCandidate : cipherCandidates) { | |
| 60 getEntry(cipherCandidate); | |
| 61 } | |
| 62 } | |
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63 |
| 307 | 64 // @SuppressWarnings("rawtypes") |
| 65 public static BlockCipher createCipher(String type, boolean encrypt, byte[] key, byte[] iv) { | |
| 66 try { | |
| 67 CipherEntry ce = getEntry(type); | |
| 68 Class<?> cc = Class.forName(ce.cipherClass); | |
| 69 BlockCipher bc = (BlockCipher) cc.newInstance(); | |
| 70 | |
| 71 if (type.endsWith("-cbc")) { | |
| 72 bc.init(encrypt, key); | |
| 73 return new CBCMode(bc, iv, encrypt); | |
| 74 } | |
| 75 else if (type.endsWith("-ctr")) { | |
| 76 bc.init(true, key); | |
| 77 return new CTRMode(bc, iv, encrypt); | |
| 78 } | |
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79 |
| 307 | 80 throw new IllegalArgumentException("Cannot instantiate " + type); |
| 81 } | |
| 82 catch (ClassNotFoundException e) { | |
| 83 throw new IllegalArgumentException("Cannot instantiate " + type, e); | |
| 84 } | |
| 85 catch (InstantiationException e) { | |
| 86 throw new IllegalArgumentException("Cannot instantiate " + type, e); | |
| 87 } | |
| 88 catch (IllegalAccessException e) { | |
| 89 throw new IllegalArgumentException("Cannot instantiate " + type, e); | |
| 90 } | |
| 91 } | |
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92 |
| 307 | 93 private static CipherEntry getEntry(String type) { |
| 94 for (CipherEntry ce : ciphers) { | |
| 95 if (ce.type.equals(type)) { | |
| 96 return ce; | |
| 97 } | |
| 98 } | |
| 99 | |
| 100 throw new IllegalArgumentException("Unkown algorithm " + type); | |
| 101 } | |
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102 |
| 307 | 103 public static int getBlockSize(String type) { |
| 104 CipherEntry ce = getEntry(type); | |
| 105 return ce.blocksize; | |
| 106 } | |
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107 |
| 307 | 108 public static int getKeySize(String type) { |
| 109 CipherEntry ce = getEntry(type); | |
| 110 return ce.keysize; | |
| 111 } | |
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112 } |