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annotate app/src/main/java/ch/ethz/ssh2/crypto/dh/GenericDhExchange.java @ 493:0a17c6e7cb0f stable-1.9.4-3
improve Makefile
author | Carl Byington <carl@five-ten-sg.com> |
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date | Tue, 15 Feb 2022 14:07:00 -0800 |
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1 |
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2 package ch.ethz.ssh2.crypto.dh; |
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3 |
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4 import java.io.IOException; |
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5 import java.io.UnsupportedEncodingException; |
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6 import java.math.BigInteger; |
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7 |
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8 import ch.ethz.ssh2.crypto.digest.HashForSSH2Types; |
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9 import ch.ethz.ssh2.log.Logger; |
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10 |
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11 |
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12 /** |
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13 * DhExchange. |
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14 * |
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15 * @author Christian Plattner, plattner@trilead.com |
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16 * @version $Id: DhExchange.java,v 1.2 2008/04/01 12:38:09 cplattne Exp $ |
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17 */ |
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18 public abstract class GenericDhExchange { |
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19 private static final Logger log = Logger.getLogger(GenericDhExchange.class); |
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20 |
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21 /* Shared secret */ |
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22 |
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23 BigInteger sharedSecret; |
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24 |
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25 protected GenericDhExchange() { |
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26 } |
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27 |
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28 public static GenericDhExchange getInstance(String algo) { |
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29 if (algo.startsWith("ecdh-sha2-")) { |
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30 return new EcDhExchange(); |
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31 } |
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32 else { |
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33 return new DhExchange(); |
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34 } |
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35 } |
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36 |
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37 public abstract void init(String name) throws IOException; |
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38 |
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39 /** |
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40 * @return Returns the e (public value) |
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41 * @throws IllegalStateException |
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42 */ |
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43 public abstract byte[] getE(); |
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44 |
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45 public void setE(BigInteger e) throws IOException { |
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46 throw new IOException(); |
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47 } |
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48 |
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49 /** |
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50 * @return Returns the server's e (public value) |
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51 * @throws IllegalStateException |
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52 */ |
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53 protected abstract byte[] getServerE(); |
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54 |
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55 /** |
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56 * @return Returns the shared secret k. |
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57 * @throws IllegalStateException |
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58 */ |
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59 public BigInteger getK() { |
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60 if (sharedSecret == null) |
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61 throw new IllegalStateException("Shared secret not yet known, need f first!"); |
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62 |
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63 return sharedSecret; |
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64 } |
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65 |
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66 /** |
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67 * @param f |
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68 */ |
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69 public void setF(BigInteger f) throws IOException { |
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70 setF(f.toByteArray()); |
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71 } |
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72 |
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73 public abstract byte[] getF(); |
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74 |
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75 public abstract void setF(byte[] f) throws IOException; |
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76 |
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77 public byte[] calculateH(byte[] clientversion, byte[] serverversion, byte[] clientKexPayload, |
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78 byte[] serverKexPayload, byte[] hostKey) throws UnsupportedEncodingException, IOException { |
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79 HashForSSH2Types hash = new HashForSSH2Types(getHashAlgo()); |
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80 log.debug("Client: '" + new String(clientversion, "ISO-8859-1") + "'"); |
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81 log.debug("Server: '" + new String(serverversion, "ISO-8859-1") + "'"); |
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82 hash.updateByteString(clientversion); |
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83 hash.updateByteString(serverversion); |
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84 hash.updateByteString(clientKexPayload); |
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85 hash.updateByteString(serverKexPayload); |
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86 hash.updateByteString(hostKey); |
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87 hash.updateByteString(getE()); |
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88 hash.updateByteString(getServerE()); |
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89 hash.updateBigInt(sharedSecret); |
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90 return hash.getDigest(); |
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91 } |
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92 |
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93 public abstract String getHashAlgo(); |
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94 } |