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annotate src/ch/ethz/ssh2/signature/RSAPrivateKey.java @ 273:91a31873c42a ganymed

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start conversion from trilead to ganymed
author Carl Byington <carl@five-ten-sg.com>
date Fri, 18 Jul 2014 11:21:46 -0700
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1 /*
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2 * Copyright (c) 2006-2013 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.signature;
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6
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7 import java.math.BigInteger;
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8 import java.security.SecureRandom;
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9
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10 /**
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11 * RSAPrivateKey.
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12 *
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13 * @author Christian Plattner
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14 * @version 2.50, 03/15/10
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15 */
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16 public class RSAPrivateKey
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17 {
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18 private BigInteger d;
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19 private BigInteger e;
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20 private BigInteger n;
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21
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22 public RSAPrivateKey(BigInteger d, BigInteger e, BigInteger n)
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23 {
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24 this.d = d;
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25 this.e = e;
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26 this.n = n;
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27 }
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28
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29 public BigInteger getD()
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30 {
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31 return d;
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32 }
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33
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34 public BigInteger getE()
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35 {
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36 return e;
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37 }
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38
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39 public BigInteger getN()
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40 {
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41 return n;
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42 }
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43
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44 public RSAPublicKey getPublicKey()
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45 {
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46 return new RSAPublicKey(e, n);
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47 }
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48
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49 /**
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50 * Generate an RSA hostkey for testing purposes only.
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51 *
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52 * @param numbits Key length in bits
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53 * @return
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54 */
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55 public static RSAPrivateKey generateKey(int numbits)
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56 {
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57 return generateKey(new SecureRandom(), numbits);
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58 }
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59
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60 /**
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61 * Generate an RSA hostkey for testing purposes only.
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62 *
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63 * @param rnd Source for random bits
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64 * @param numbits Key length in bits
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65 * @return
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66 */
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67 public static RSAPrivateKey generateKey(SecureRandom rnd, int numbits)
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68 {
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69 BigInteger p = BigInteger.probablePrime(numbits / 2, rnd);
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70 BigInteger q = BigInteger.probablePrime(numbits / 2, rnd);
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71 BigInteger phi = (p.subtract(BigInteger.ONE)).multiply(q.subtract(BigInteger.ONE));
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72
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73 BigInteger n = p.multiply(q);
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74 BigInteger e = new BigInteger("65537");
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75 BigInteger d = e.modInverse(phi);
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76
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77 return new RSAPrivateKey(d, e, n);
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78 }
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79 }