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1
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2 package com.trilead.ssh2.crypto.digest;
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3
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4 import java.math.BigInteger;
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5 import java.security.DigestException;
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6 import java.security.MessageDigest;
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7 import java.security.NoSuchAlgorithmException;
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8
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9 /**
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10 * HashForSSH2Types.
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11 *
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12 * @author Christian Plattner, plattner@trilead.com
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13 * @version $Id: HashForSSH2Types.java,v 1.1 2007/10/15 12:49:57 cplattne Exp $
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14 */
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15 public class HashForSSH2Types {
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16 MessageDigest md;
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17
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18 public HashForSSH2Types(String type) {
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19 try {
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20 md = MessageDigest.getInstance(type);
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21 }
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22 catch (NoSuchAlgorithmException e) {
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23 throw new RuntimeException("Unsupported algorithm " + type);
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24 }
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25 }
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26
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27 public void updateByte(byte b) {
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28 /* HACK - to test it with J2ME */
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29 byte[] tmp = new byte[1];
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30 tmp[0] = b;
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31 md.update(tmp);
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32 }
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33
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34 public void updateBytes(byte[] b) {
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35 md.update(b);
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36 }
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37
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38 public void updateUINT32(int v) {
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39 md.update((byte)(v >> 24));
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40 md.update((byte)(v >> 16));
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41 md.update((byte)(v >> 8));
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42 md.update((byte)(v));
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43 }
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44
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45 public void updateByteString(byte[] b) {
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46 updateUINT32(b.length);
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47 updateBytes(b);
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48 }
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49
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50 public void updateBigInt(BigInteger b) {
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51 updateByteString(b.toByteArray());
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52 }
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53
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54 public void reset() {
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55 md.reset();
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56 }
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57
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58 public int getDigestLength() {
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59 return md.getDigestLength();
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60 }
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61
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62 public byte[] getDigest() {
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63 byte[] tmp = new byte[md.getDigestLength()];
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64 getDigest(tmp);
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65 return tmp;
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66 }
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67
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68 public void getDigest(byte[] out) {
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69 getDigest(out, 0);
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70 }
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71
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72 public void getDigest(byte[] out, int off) {
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73 try {
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74 md.digest(out, off, out.length - off);
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75 }
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76 catch (DigestException e) {
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77 // TODO is this right?!
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78 throw new RuntimeException("Unable to digest", e);
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79 }
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80 }
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81 }
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