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annotate src/ch/ethz/ssh2/crypto/cipher/CipherInputStream.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 071eccdff8ea
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rev   line source
273
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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 {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
154 throw new IOException("Cannot fill buffer, EOF reached.");
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
155 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
156 n += cnt;
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 return n;
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
159 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
160 }