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annotate src/ch/ethz/ssh2/DHGexParameters.java @ 286:4656869af8fe ganymed

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start conversion from trilead to ganymed
author Carl Byington <carl@five-ten-sg.com>
date Fri, 18 Jul 2014 19:26:29 -0700
parents 91a31873c42a
children 071eccdff8ea
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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;
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6
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7 /**
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8 * A <code>DHGexParameters</code> object can be used to specify parameters for
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9 * the diffie-hellman group exchange.
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10 * <p>
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11 * Depending on which constructor is used, either the use of a
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12 * <code>SSH_MSG_KEX_DH_GEX_REQUEST</code> or <code>SSH_MSG_KEX_DH_GEX_REQUEST_OLD</code>
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13 * can be forced.
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14 *
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15 * @see Connection#setDHGexParameters(DHGexParameters)
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16 * @author Christian Plattner
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17 * @version 2.50, 03/15/10
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18 */
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19
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20 public class DHGexParameters
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21 {
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22 private final int min_group_len;
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23 private final int pref_group_len;
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24 private final int max_group_len;
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25
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26 private static final int MIN_ALLOWED = 1024;
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27 private static final int MAX_ALLOWED = 8192;
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28
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29 /**
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30 * Same as calling {@link #DHGexParameters(int, int, int) DHGexParameters(1024, 1024, 4096)}.
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31 * This is also the default used by the Connection class.
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32 *
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33 */
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34 public DHGexParameters()
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35 {
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36 this(1024, 1024, 4096);
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37 }
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38
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39 /**
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40 * This constructor can be used to force the sending of a
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41 * <code>SSH_MSG_KEX_DH_GEX_REQUEST_OLD</code> request.
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42 * Internally, the minimum and maximum group lengths will
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43 * be set to zero.
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44 *
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45 * @param pref_group_len has to be &gt= 1024 and &lt;= 8192
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46 */
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47 public DHGexParameters(int pref_group_len)
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48 {
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49 if ((pref_group_len < MIN_ALLOWED) || (pref_group_len > MAX_ALLOWED))
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50 throw new IllegalArgumentException("pref_group_len out of range!");
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51
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52 this.pref_group_len = pref_group_len;
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53 this.min_group_len = 0;
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54 this.max_group_len = 0;
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55 }
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56
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57 /**
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58 * This constructor can be used to force the sending of a
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59 * <code>SSH_MSG_KEX_DH_GEX_REQUEST</code> request.
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60 * <p>
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61 * Note: older OpenSSH servers don't understand this request, in which
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62 * case you should use the {@link #DHGexParameters(int)} constructor.
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63 * <p>
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64 * All values have to be &gt= 1024 and &lt;= 8192. Furthermore,
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65 * min_group_len &lt;= pref_group_len &lt;= max_group_len.
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66 *
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67 * @param min_group_len
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68 * @param pref_group_len
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69 * @param max_group_len
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70 */
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71 public DHGexParameters(int min_group_len, int pref_group_len, int max_group_len)
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72 {
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73 if ((min_group_len < MIN_ALLOWED) || (min_group_len > MAX_ALLOWED))
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74 throw new IllegalArgumentException("min_group_len out of range!");
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75
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76 if ((pref_group_len < MIN_ALLOWED) || (pref_group_len > MAX_ALLOWED))
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77 throw new IllegalArgumentException("pref_group_len out of range!");
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78
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79 if ((max_group_len < MIN_ALLOWED) || (max_group_len > MAX_ALLOWED))
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80 throw new IllegalArgumentException("max_group_len out of range!");
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81
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82 if ((pref_group_len < min_group_len) || (pref_group_len > max_group_len))
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83 throw new IllegalArgumentException("pref_group_len is incompatible with min and max!");
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84
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85 if (max_group_len < min_group_len)
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86 throw new IllegalArgumentException("max_group_len must not be smaller than min_group_len!");
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87
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88 this.min_group_len = min_group_len;
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89 this.pref_group_len = pref_group_len;
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90 this.max_group_len = max_group_len;
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91 }
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92
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93 /**
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94 * Get the maximum group length.
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95 *
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96 * @return the maximum group length, may be <code>zero</code> if
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97 * SSH_MSG_KEX_DH_GEX_REQUEST_OLD should be requested
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98 */
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99 public int getMax_group_len()
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100 {
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101 return max_group_len;
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102 }
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103
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104 /**
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105 * Get the minimum group length.
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106 *
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107 * @return minimum group length, may be <code>zero</code> if
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108 * SSH_MSG_KEX_DH_GEX_REQUEST_OLD should be requested
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109 */
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110 public int getMin_group_len()
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111 {
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112 return min_group_len;
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113 }
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114
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115 /**
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116 * Get the preferred group length.
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117 *
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118 * @return the preferred group length
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119 */
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120 public int getPref_group_len()
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121 {
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122 return pref_group_len;
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123 }
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124 }