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annotate app/src/main/java/ch/ethz/ssh2/crypto/cipher/CTRMode.java @ 490:7545103ec815 stable-1.9.4-2
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| author | Carl Byington <carl@five-ten-sg.com> |
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| date | Wed, 14 Oct 2020 14:48:55 -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 /** |
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8 * This is CTR mode as described in draft-ietf-secsh-newmodes-XY.txt |
| 307 | 9 * |
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10 * @author Christian Plattner |
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11 * @version 2.50, 03/15/10 |
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12 */ |
| 307 | 13 public class CTRMode implements BlockCipher { |
| 14 byte[] X; | |
| 15 byte[] Xenc; | |
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16 |
| 307 | 17 BlockCipher bc; |
| 18 int blockSize; | |
| 19 boolean doEncrypt; | |
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20 |
| 307 | 21 int count = 0; |
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22 |
| 307 | 23 public void init(boolean forEncryption, byte[] key) { |
| 24 } | |
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25 |
| 307 | 26 public CTRMode(BlockCipher tc, byte[] iv, boolean doEnc) throws IllegalArgumentException { |
| 27 bc = tc; | |
| 28 blockSize = bc.getBlockSize(); | |
| 29 doEncrypt = doEnc; | |
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30 |
| 307 | 31 if (blockSize != iv.length) |
| 32 throw new IllegalArgumentException("IV must be " + blockSize + " bytes long! (currently " + iv.length + ")"); | |
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33 |
| 307 | 34 X = new byte[blockSize]; |
| 35 Xenc = new byte[blockSize]; | |
| 36 System.arraycopy(iv, 0, X, 0, blockSize); | |
| 37 } | |
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38 |
| 307 | 39 public final int getBlockSize() { |
| 40 return blockSize; | |
| 41 } | |
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42 |
| 307 | 43 public final void transformBlock(byte[] src, int srcoff, byte[] dst, int dstoff) { |
| 44 bc.transformBlock(X, 0, Xenc, 0); | |
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45 |
| 307 | 46 for (int i = 0; i < blockSize; i++) { |
| 47 dst[dstoff + i] = (byte)(src[srcoff + i] ^ Xenc[i]); | |
| 48 } | |
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49 |
| 307 | 50 for (int i = (blockSize - 1); i >= 0; i--) { |
| 51 X[i]++; | |
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52 |
| 307 | 53 if (X[i] != 0) |
| 54 break; | |
| 55 } | |
| 56 } | |
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57 } |