Mercurial > 510Connectbot
annotate src/ch/ethz/ssh2/crypto/cipher/CipherInputStream.java @ 286:4656869af8fe ganymed
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author | Carl Byington <carl@five-ten-sg.com> |
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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.crypto.cipher; |
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6 |
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7 import java.io.IOException; |
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8 import java.io.InputStream; |
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9 |
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10 /** |
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11 * CipherInputStream. |
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12 * |
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13 * @author Christian Plattner |
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14 * @version $Id: CipherInputStream.java 11 2011-05-27 14:14:06Z dkocher@sudo.ch $ |
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15 */ |
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16 public class CipherInputStream |
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17 { |
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18 BlockCipher currentCipher; |
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19 InputStream bi; |
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20 byte[] buffer; |
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21 byte[] enc; |
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22 int blockSize; |
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23 int pos; |
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24 |
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25 /* |
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26 * We cannot use java.io.BufferedInputStream, since that is not available in |
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27 * J2ME. Everything could be improved alot here. |
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28 */ |
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29 |
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30 private static final int BUFF_SIZE = 8192; |
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31 byte[] input_buffer = new byte[BUFF_SIZE]; |
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32 int input_buffer_pos = 0; |
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33 int input_buffer_size = 0; |
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34 |
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35 public CipherInputStream(BlockCipher tc, InputStream bi) |
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36 { |
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37 this.bi = bi; |
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38 changeCipher(tc); |
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39 } |
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40 |
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41 private int fill_buffer() throws IOException |
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42 { |
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43 input_buffer_pos = 0; |
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44 input_buffer_size = 0; |
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45 input_buffer_size = bi.read(input_buffer, 0, BUFF_SIZE); |
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46 return input_buffer_size; |
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47 } |
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48 |
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49 private int internal_read(byte[] b, int off, int len) throws IOException |
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50 { |
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51 if (input_buffer_size < 0) |
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52 { |
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53 return -1; |
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54 } |
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55 |
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56 if (input_buffer_pos >= input_buffer_size) |
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57 { |
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58 if (fill_buffer() <= 0) |
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59 { |
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60 return -1; |
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61 } |
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62 } |
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63 |
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64 int avail = input_buffer_size - input_buffer_pos; |
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65 int thiscopy = (len > avail) ? avail : len; |
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66 |
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67 System.arraycopy(input_buffer, input_buffer_pos, b, off, thiscopy); |
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68 input_buffer_pos += thiscopy; |
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69 |
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70 return thiscopy; |
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71 } |
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72 |
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73 public void changeCipher(BlockCipher bc) |
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74 { |
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75 this.currentCipher = bc; |
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76 blockSize = bc.getBlockSize(); |
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77 buffer = new byte[blockSize]; |
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78 enc = new byte[blockSize]; |
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79 pos = blockSize; |
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80 } |
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81 |
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82 private void getBlock() throws IOException |
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83 { |
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84 int n = 0; |
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85 while (n < blockSize) |
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86 { |
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87 int len = internal_read(enc, n, blockSize - n); |
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88 if (len < 0) |
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89 { |
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90 throw new IOException("Cannot read full block, EOF reached."); |
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91 } |
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92 n += len; |
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93 } |
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94 |
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95 try |
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96 { |
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97 currentCipher.transformBlock(enc, 0, buffer, 0); |
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98 } |
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99 catch (Exception e) |
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100 { |
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101 throw new IOException("Error while decrypting block."); |
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102 } |
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103 pos = 0; |
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104 } |
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105 |
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106 public int read(byte[] dst) throws IOException |
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107 { |
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108 return read(dst, 0, dst.length); |
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109 } |
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110 |
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111 public int read(byte[] dst, int off, int len) throws IOException |
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112 { |
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113 int count = 0; |
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114 |
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115 while (len > 0) |
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116 { |
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117 if (pos >= blockSize) |
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118 { |
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119 getBlock(); |
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120 } |
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121 |
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122 int avail = blockSize - pos; |
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123 int copy = Math.min(avail, len); |
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124 System.arraycopy(buffer, pos, dst, off, copy); |
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125 pos += copy; |
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126 off += copy; |
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127 len -= copy; |
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128 count += copy; |
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129 } |
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130 return count; |
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131 } |
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132 |
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133 public int read() throws IOException |
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134 { |
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135 if (pos >= blockSize) |
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136 { |
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137 getBlock(); |
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138 } |
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139 return buffer[pos++] & 0xff; |
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140 } |
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141 |
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142 public int readPlain(byte[] b, int off, int len) throws IOException |
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143 { |
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144 if (pos != blockSize) |
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145 { |
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146 throw new IOException("Cannot read plain since crypto buffer is not aligned."); |
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147 } |
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148 int n = 0; |
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149 while (n < len) |
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150 { |
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151 int cnt = internal_read(b, off + n, len - n); |
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152 if (cnt < 0) |
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153 { |
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154 throw new IOException("Cannot fill buffer, EOF reached."); |
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155 } |
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156 n += cnt; |
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157 } |
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158 return n; |
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159 } |
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160 } |