annotate src/com/five_ten_sg/connectbot/GeneratePubkeyActivity.java @ 392:7ac1a0b02f44

add test buffer changed when input stream runs dry, similar to async test
author Carl Byington <carl@five-ten-sg.com>
date Tue, 16 Sep 2014 16:22:41 -0700
parents b40bc65fa09a
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1 /*
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2 * ConnectBot: simple, powerful, open-source SSH client for Android
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3 * Copyright 2007 Kenny Root, Jeffrey Sharkey
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4 *
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5 * Licensed under the Apache License, Version 2.0 (the "License");
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6 * you may not use this file except in compliance with the License.
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7 * You may obtain a copy of the License at
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8 *
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9 * http://www.apache.org/licenses/LICENSE-2.0
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10 *
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11 * Unless required by applicable law or agreed to in writing, software
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12 * distributed under the License is distributed on an "AS IS" BASIS,
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13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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14 * See the License for the specific language governing permissions and
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15 * limitations under the License.
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16 */
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17
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18 package com.five_ten_sg.connectbot;
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19
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20 import java.security.KeyPair;
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21 import java.security.KeyPairGenerator;
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22 import java.security.PrivateKey;
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23 import java.security.PublicKey;
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24
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25 import com.five_ten_sg.connectbot.bean.PubkeyBean;
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26 import com.five_ten_sg.connectbot.util.EntropyDialog;
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27 import com.five_ten_sg.connectbot.util.EntropyView;
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28 import com.five_ten_sg.connectbot.util.OnEntropyGatheredListener;
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29 import com.five_ten_sg.connectbot.util.PubkeyDatabase;
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30 import com.five_ten_sg.connectbot.util.PubkeyUtils;
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31 import android.app.Activity;
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32 import android.app.Dialog;
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33 import android.app.ProgressDialog;
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34 import android.os.Bundle;
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35 import android.text.Editable;
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36 import android.text.TextWatcher;
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37 import android.util.Log;
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38 import android.view.LayoutInflater;
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39 import android.view.View;
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40 import android.view.View.OnClickListener;
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41 import android.view.View.OnFocusChangeListener;
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42 import android.widget.Button;
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43 import android.widget.CheckBox;
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44 import android.widget.EditText;
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45 import android.widget.RadioGroup;
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46 import android.widget.RadioGroup.OnCheckedChangeListener;
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47 import android.widget.SeekBar;
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48 import android.widget.SeekBar.OnSeekBarChangeListener;
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49
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50 import ch.ethz.ssh2.crypto.SecureRandomFix;
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51 import ch.ethz.ssh2.signature.ECDSASHA2Verify;
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52
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53 public class GeneratePubkeyActivity extends Activity implements OnEntropyGatheredListener {
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54 public final static String TAG = "ConnectBot.GeneratePubkeyActivity";
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55
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56 private static final int RSA_MINIMUM_BITS = 768;
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57 final static int DEFAULT_BITS = 2048;
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58 final static int DSA_BITS = 1024;
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59 final static int[] ECDSA_SIZES = ECDSASHA2Verify.getCurveSizes();
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60 final static int ECDSA_DEFAULT_BITS = ECDSA_SIZES[0];
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61
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62 private LayoutInflater inflater = null;
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63
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64 private EditText nickname;
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65 private RadioGroup keyTypeGroup;
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66 private SeekBar bitsSlider;
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67 private EditText bitsText;
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68 private CheckBox unlockAtStartup;
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69 private CheckBox confirmUse;
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70 private Button save;
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71 private Dialog entropyDialog;
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72 private ProgressDialog progress;
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73
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74 private EditText password1, password2;
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75
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76 private String keyType = PubkeyDatabase.KEY_TYPE_RSA;
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77 private int minBits = RSA_MINIMUM_BITS;
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78 private int bits = DEFAULT_BITS;
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79
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80 private byte[] entropy;
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81
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82 @Override
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83 public void onCreate(Bundle icicle) {
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84 super.onCreate(icicle);
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85 setContentView(R.layout.act_generatepubkey);
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86 nickname = (EditText) findViewById(R.id.nickname);
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87 keyTypeGroup = (RadioGroup) findViewById(R.id.key_type);
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88 bitsText = (EditText) findViewById(R.id.bits);
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89 bitsSlider = (SeekBar) findViewById(R.id.bits_slider);
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90 password1 = (EditText) findViewById(R.id.password1);
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91 password2 = (EditText) findViewById(R.id.password2);
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92 unlockAtStartup = (CheckBox) findViewById(R.id.unlock_at_startup);
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93 confirmUse = (CheckBox) findViewById(R.id.confirm_use);
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94 save = (Button) findViewById(R.id.save);
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95 inflater = LayoutInflater.from(this);
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96 nickname.addTextChangedListener(textChecker);
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97 password1.addTextChangedListener(textChecker);
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98 password2.addTextChangedListener(textChecker);
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99 keyTypeGroup.setOnCheckedChangeListener(new OnCheckedChangeListener() {
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100 public void onCheckedChanged(RadioGroup group, int checkedId) {
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101 if (checkedId == R.id.rsa) {
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102 minBits = RSA_MINIMUM_BITS;
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103 bitsSlider.setEnabled(true);
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104 bitsSlider.setProgress(DEFAULT_BITS - minBits);
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105 bitsText.setText(String.valueOf(DEFAULT_BITS));
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106 bitsText.setEnabled(true);
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107 keyType = PubkeyDatabase.KEY_TYPE_RSA;
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108 }
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109 else if (checkedId == R.id.dsa) {
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110 // DSA keys can only be 1024 bits
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111 bitsSlider.setEnabled(false);
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112 bitsSlider.setProgress(DSA_BITS - minBits);
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113 bitsText.setText(String.valueOf(DSA_BITS));
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114 bitsText.setEnabled(false);
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115 keyType = PubkeyDatabase.KEY_TYPE_DSA;
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116 }
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117 else if (checkedId == R.id.ec) {
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118 minBits = ECDSA_DEFAULT_BITS;
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119 bitsSlider.setEnabled(true);
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120 bitsSlider.setProgress(ECDSA_DEFAULT_BITS - minBits);
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121 bitsText.setText(String.valueOf(ECDSA_DEFAULT_BITS));
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122 bitsText.setEnabled(true);
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123 keyType = PubkeyDatabase.KEY_TYPE_EC;
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124 }
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125 }
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126 });
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127 bitsSlider.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
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128 public void onProgressChanged(SeekBar seekBar, int progress,
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129 boolean fromTouch) {
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130 if (PubkeyDatabase.KEY_TYPE_EC.equals(keyType)) {
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131 bits = getClosestFieldSize(progress + minBits);
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132 seekBar.setProgress(bits - minBits);
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133 }
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134 else {
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135 // Stay evenly divisible by 8 because it looks nicer to have
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136 // 2048 than 2043 bits.
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137 final int ourProgress = progress - (progress % 8);
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138 bits = minBits + ourProgress;
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139 }
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140
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141 bitsText.setText(String.valueOf(bits));
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142 }
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143 public void onStartTrackingTouch(SeekBar seekBar) {
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144 // We don't care about the start.
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145 }
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146 public void onStopTrackingTouch(SeekBar seekBar) {
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147 // We don't care about the stop.
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148 }
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149 });
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150 bitsText.setOnFocusChangeListener(new OnFocusChangeListener() {
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151 public void onFocusChange(View v, boolean hasFocus) {
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152 if (!hasFocus) {
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153 final boolean isEc = PubkeyDatabase.KEY_TYPE_EC.equals(keyType);
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154
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155 try {
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156 bits = Integer.parseInt(bitsText.getText().toString());
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157
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158 if (bits < minBits) {
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159 bits = minBits;
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160 bitsText.setText(String.valueOf(bits));
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161 }
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162
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diff changeset
163 if (isEc) {
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
164 bits = getClosestFieldSize(bits);
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
165 }
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
166 }
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
167 catch (NumberFormatException nfe) {
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
168 bits = isEc ? ECDSA_DEFAULT_BITS : DEFAULT_BITS;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
169 bitsText.setText(String.valueOf(bits));
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
170 }
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
171
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
172 bitsSlider.setProgress(bits - minBits);
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
173 }
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
174 }
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
175 });
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
176 save.setOnClickListener(new OnClickListener() {
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
177 public void onClick(View view) {
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
178 GeneratePubkeyActivity.this.save.setEnabled(false);
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
179 GeneratePubkeyActivity.this.startEntropyGather();
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
180 }
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
181 });
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
182 }
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
183
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
184 private void checkEntries() {
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
185 boolean allowSave = true;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
186
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
187 if (!password1.getText().toString().equals(password2.getText().toString()))
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
188 allowSave = false;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
189
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
190 if (nickname.getText().length() == 0)
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
191 allowSave = false;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
192
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
193 save.setEnabled(allowSave);
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
194 }
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
195
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
196 private void startEntropyGather() {
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
197 final View entropyView = inflater.inflate(R.layout.dia_gatherentropy, null, false);
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Carl Byington <carl@five-ten-sg.com>
parents:
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198 ((EntropyView)entropyView.findViewById(R.id.entropy)).addOnEntropyGatheredListener(GeneratePubkeyActivity.this);
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diff changeset
199 entropyDialog = new EntropyDialog(GeneratePubkeyActivity.this, entropyView);
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
200 entropyDialog.show();
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
201 }
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
202
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
203 public void onEntropyGathered(byte[] entropy) {
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Carl Byington <carl@five-ten-sg.com>
parents:
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204 // For some reason the entropy dialog was aborted, exit activity
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
205 if (entropy == null) {
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
206 finish();
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
207 return;
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
208 }
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
209
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
210 this.entropy = entropy.clone();
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
211 int numSetBits = 0;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
212
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
213 for (int i = 0; i < 20; i++)
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
214 numSetBits += measureNumberOfSetBits(this.entropy[i]);
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
215
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
216 Log.d(TAG, "Entropy distribution=" + (int)(100.0 * numSetBits / 160.0) + "%");
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
217 Log.d(TAG, "entropy gathered; attemping to generate key...");
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
218 startKeyGen();
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
219 }
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
220
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
221 private void startKeyGen() {
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
222 progress = new ProgressDialog(GeneratePubkeyActivity.this);
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
223 progress.setMessage(GeneratePubkeyActivity.this.getResources().getText(R.string.pubkey_generating));
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
224 progress.setIndeterminate(true);
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
225 progress.setCancelable(false);
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
226 progress.show();
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
227 Thread keyGenThread = new Thread(mKeyGen);
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
228 keyGenThread.setName("KeyGen");
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
229 keyGenThread.start();
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
230 }
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
231
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
232 final private Runnable mKeyGen = new Runnable() {
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
233 public void run() {
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
234 try {
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
235 boolean encrypted = false;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
236 int tmpbits = bits;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
237
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
238 if (keyType == PubkeyDatabase.KEY_TYPE_DSA)
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
239 tmpbits = DSA_BITS;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
240
344
b40bc65fa09a compensate for SecureRandom bug on older devices
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
241 SecureRandomFix random = new SecureRandomFix();
0
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
242 // Work around JVM bug
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
243 random.nextInt();
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
244 random.setSeed(entropy);
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
245 KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(keyType);
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
246 keyPairGen.initialize(tmpbits, random);
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
247 KeyPair pair = keyPairGen.generateKeyPair();
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
248 PrivateKey priv = pair.getPrivate();
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
249 PublicKey pub = pair.getPublic();
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
250 String secret = password1.getText().toString();
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
251
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
252 if (secret.length() > 0)
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
253 encrypted = true;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
254
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
255 Log.d(TAG, "private: " + PubkeyUtils.formatKey(priv));
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
256 Log.d(TAG, "public: " + PubkeyUtils.formatKey(pub));
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
257 PubkeyBean pubkey = new PubkeyBean();
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
258 pubkey.setNickname(nickname.getText().toString());
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
259 pubkey.setType(keyType);
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
260 pubkey.setPrivateKey(PubkeyUtils.getEncodedPrivate(priv, secret));
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
261 pubkey.setPublicKey(pub.getEncoded());
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
262 pubkey.setEncrypted(encrypted);
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
263 pubkey.setStartup(unlockAtStartup.isChecked());
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
264 pubkey.setConfirmUse(confirmUse.isChecked());
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
265 PubkeyDatabase pubkeydb = new PubkeyDatabase(GeneratePubkeyActivity.this);
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
266 pubkeydb.savePubkey(pubkey);
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
267 pubkeydb.close();
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
268 }
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
269 catch (Exception e) {
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
270 Log.e(TAG, "Could not generate key pair");
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
271 e.printStackTrace();
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
272 }
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
273
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
274 GeneratePubkeyActivity.this.runOnUiThread(new Runnable() {
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
275 public void run() {
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
276 progress.dismiss();
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
277 GeneratePubkeyActivity.this.finish();
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
278 }
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
279 });
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
280 }
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
281 };
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
282
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
283 final private TextWatcher textChecker = new TextWatcher() {
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
284 public void afterTextChanged(Editable s) {}
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
285 public void beforeTextChanged(CharSequence s, int start, int count,
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
286 int after) {}
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
287 public void onTextChanged(CharSequence s, int start, int before,
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
288 int count) {
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
289 checkEntries();
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
290 }
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
291 };
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
292
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
293 private int measureNumberOfSetBits(byte b) {
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
294 int numSetBits = 0;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
295
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
296 for (int i = 0; i < 8; i++) {
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
297 if ((b & 1) == 1)
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
298 numSetBits++;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
299
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
300 b >>= 1;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
301 }
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
302
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
303 return numSetBits;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
304 }
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
305
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
306 private int getClosestFieldSize(int bits) {
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
307 int outBits = ECDSA_DEFAULT_BITS;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
308 int distance = Math.abs(bits - ECDSA_DEFAULT_BITS);
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
309
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
310 for (int i = 1; i < ECDSA_SIZES.length; i++) {
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
311 int thisDistance = Math.abs(bits - ECDSA_SIZES[i]);
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
312
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
313 if (thisDistance < distance) {
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
314 distance = thisDistance;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
315 outBits = ECDSA_SIZES[i];
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
316 }
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
317 }
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
318
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
319 return outBits;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
320 }
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
321 }