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annotate src/ch/ethz/ssh2/crypto/KeyMaterial.java @ 390:d26faad31533

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author Carl Byington <carl@five-ten-sg.com>
date Tue, 16 Sep 2014 11:11:15 -0700
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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;
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6
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7 import java.io.IOException;
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8 import java.math.BigInteger;
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9
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10 import ch.ethz.ssh2.crypto.digest.HashForSSH2Types;
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12 /**
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13 * Establishes key material for iv/key/mac (both directions).
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14 *
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15 * @author Christian Plattner
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16 * @version 2.50, 03/15/10
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17 */
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18 public class KeyMaterial {
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19 public byte[] initial_iv_client_to_server;
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20 public byte[] initial_iv_server_to_client;
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21 public byte[] enc_key_client_to_server;
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22 public byte[] enc_key_server_to_client;
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23 public byte[] integrity_key_client_to_server;
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24 public byte[] integrity_key_server_to_client;
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25
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26 private static byte[] calculateKey(HashForSSH2Types sh, BigInteger K, byte[] H, byte type, byte[] SessionID,
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27 int keyLength) throws IOException {
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28 byte[] res = new byte[keyLength];
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29 int dglen = sh.getDigestLength();
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30 int numRounds = (keyLength + dglen - 1) / dglen;
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31 byte[][] tmp = new byte[numRounds][];
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32 sh.reset();
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33 sh.updateBigInt(K);
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34 sh.updateBytes(H);
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35 sh.updateByte(type);
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36 sh.updateBytes(SessionID);
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37 tmp[0] = sh.getDigest();
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38 int off = 0;
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39 int produced = Math.min(dglen, keyLength);
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40 System.arraycopy(tmp[0], 0, res, off, produced);
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41 keyLength -= produced;
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42 off += produced;
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43
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44 for (int i = 1; i < numRounds; i++) {
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45 sh.updateBigInt(K);
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46 sh.updateBytes(H);
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47
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48 for (int j = 0; j < i; j++) {
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49 sh.updateBytes(tmp[j]);
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50 }
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51
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52 tmp[i] = sh.getDigest();
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53 produced = Math.min(dglen, keyLength);
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54 System.arraycopy(tmp[i], 0, res, off, produced);
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55 keyLength -= produced;
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56 off += produced;
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57 }
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58
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59 return res;
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60 }
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61
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62 public static KeyMaterial create(String hashType, byte[] H, BigInteger K, byte[] SessionID, int keyLengthCS,
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63 int blockSizeCS, int macLengthCS, int keyLengthSC, int blockSizeSC, int macLengthSC)
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64 throws IOException {
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65 KeyMaterial km = new KeyMaterial();
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66 HashForSSH2Types sh = new HashForSSH2Types(hashType);
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67 km.initial_iv_client_to_server = calculateKey(sh, K, H, (byte) 'A', SessionID, blockSizeCS);
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68 km.initial_iv_server_to_client = calculateKey(sh, K, H, (byte) 'B', SessionID, blockSizeSC);
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69 km.enc_key_client_to_server = calculateKey(sh, K, H, (byte) 'C', SessionID, keyLengthCS);
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70 km.enc_key_server_to_client = calculateKey(sh, K, H, (byte) 'D', SessionID, keyLengthSC);
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71 km.integrity_key_client_to_server = calculateKey(sh, K, H, (byte) 'E', SessionID, macLengthCS);
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72 km.integrity_key_server_to_client = calculateKey(sh, K, H, (byte) 'F', SessionID, macLengthSC);
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73 return km;
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74 }
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75 }