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annotate src/ch/ethz/ssh2/crypto/SimpleDERReader.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
parents
children e0da43026046
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273
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Carl Byington <carl@five-ten-sg.com>
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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.crypto;
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6
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7 import java.io.IOException;
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8
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9 import java.math.BigInteger;
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10
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11 /**
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12 * SimpleDERReader.
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13 *
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14 * @author Christian Plattner
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15 * @version 2.50, 03/15/10
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16 */
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17 public class SimpleDERReader
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18 {
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19 byte[] buffer;
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20 int pos;
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21 int count;
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22
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23 public SimpleDERReader(byte[] b)
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24 {
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25 resetInput(b);
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26 }
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27
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28 public SimpleDERReader(byte[] b, int off, int len)
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29 {
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30 resetInput(b, off, len);
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31 }
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32
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33 public void resetInput(byte[] b)
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34 {
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35 resetInput(b, 0, b.length);
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36 }
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37
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38 public void resetInput(byte[] b, int off, int len)
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39 {
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40 buffer = b;
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41 pos = off;
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42 count = len;
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43 }
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44
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45 private byte readByte() throws IOException
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46 {
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47 if (count <= 0)
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48 throw new IOException("DER byte array: out of data");
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49 count--;
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50 return buffer[pos++];
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51 }
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52
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53 private byte[] readBytes(int len) throws IOException
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54 {
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55 if (len > count)
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56 throw new IOException("DER byte array: out of data");
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57
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58 byte[] b = new byte[len];
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59
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60 System.arraycopy(buffer, pos, b, 0, len);
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61
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62 pos += len;
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63 count -= len;
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64
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65 return b;
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66 }
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67
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68 public int available()
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69 {
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70 return count;
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71 }
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72
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73 private int readLength() throws IOException
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74 {
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75 int len = readByte() & 0xff;
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76
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77 if ((len & 0x80) == 0)
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78 return len;
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79
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80 int remain = len & 0x7F;
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81
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82 if (remain == 0)
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83 return -1;
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84
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85 len = 0;
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86
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87 while (remain > 0)
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88 {
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89 len = len << 8;
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90 len = len | (readByte() & 0xff);
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91 remain--;
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92 }
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93
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94 return len;
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95 }
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96
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97 public int ignoreNextObject() throws IOException
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98 {
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99 int type = readByte() & 0xff;
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100
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101 int len = readLength();
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102
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103 if ((len < 0) || len > available())
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104 throw new IOException("Illegal len in DER object (" + len + ")");
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105
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106 readBytes(len);
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107
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108 return type;
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109 }
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110
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111 public BigInteger readInt() throws IOException
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112 {
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113 int type = readByte() & 0xff;
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114
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115 if (type != 0x02)
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116 throw new IOException("Expected DER Integer, but found type " + type);
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117
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118 int len = readLength();
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119
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120 if ((len < 0) || len > available())
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121 throw new IOException("Illegal len in DER object (" + len + ")");
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122
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123 byte[] b = readBytes(len);
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124
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125 return new BigInteger(b);
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126 }
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127
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128 public byte[] readSequenceAsByteArray() throws IOException
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129 {
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130 int type = readByte() & 0xff;
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131
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132 if (type != 0x30)
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133 throw new IOException("Expected DER Sequence, but found type " + type);
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134
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135 int len = readLength();
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136
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137 if ((len < 0) || len > available())
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138 throw new IOException("Illegal len in DER object (" + len + ")");
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139
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140 return readBytes(len);
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141 }
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142
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143 public byte[] readOctetString() throws IOException
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144 {
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145 int type = readByte() & 0xff;
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146
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147 if (type != 0x04)
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148 throw new IOException("Expected DER Octetstring, but found type " + type);
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149
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150 int len = readLength();
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151
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152 if ((len < 0) || len > available())
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153 throw new IOException("Illegal len in DER object (" + len + ")");
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154
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155 return readBytes(len);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
156 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
157
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
158 }