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annotate src/ch/ethz/ssh2/crypto/cipher/CipherOutputStream.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.OutputStream;
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9
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10 /**
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11 * CipherOutputStream.
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12 *
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13 * @author Christian Plattner
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14 * @version $Id: CipherOutputStream.java 85 2014-04-07 14:05:09Z dkocher@sudo.ch $
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15 */
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16 public class CipherOutputStream
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17 {
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18 BlockCipher currentCipher;
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19 OutputStream bo;
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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.BufferedOutputStream, since that is not available
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27 * in J2ME. Everything could be improved here alot.
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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[] out_buffer = new byte[BUFF_SIZE];
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32 int out_buffer_pos = 0;
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33
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34 public CipherOutputStream(BlockCipher tc, OutputStream bo)
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35 {
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36 this.bo = bo;
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37 changeCipher(tc);
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38 }
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39
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40 private void internal_write(byte[] src, int off, int len) throws IOException
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41 {
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42 while (len > 0)
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43 {
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44 int space = BUFF_SIZE - out_buffer_pos;
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45 int copy = (len > space) ? space : len;
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46
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47 System.arraycopy(src, off, out_buffer, out_buffer_pos, copy);
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48
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49 off += copy;
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50 out_buffer_pos += copy;
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51 len -= copy;
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52
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53 if (out_buffer_pos >= BUFF_SIZE)
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54 {
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55 bo.write(out_buffer, 0, BUFF_SIZE);
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56 out_buffer_pos = 0;
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57 }
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58 }
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59 }
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60
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61 private void internal_write(int b) throws IOException
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62 {
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63 out_buffer[out_buffer_pos++] = (byte) b;
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64 if (out_buffer_pos >= BUFF_SIZE)
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65 {
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66 bo.write(out_buffer, 0, BUFF_SIZE);
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67 out_buffer_pos = 0;
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68 }
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69 }
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70
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71 public void flush() throws IOException
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72 {
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73 if (pos != 0)
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74 {
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75 throw new IOException("FATAL: cannot flush since crypto buffer is not aligned.");
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76 }
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77
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78 if (out_buffer_pos > 0)
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79 {
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80 bo.write(out_buffer, 0, out_buffer_pos);
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81 out_buffer_pos = 0;
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82 }
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83 bo.flush();
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84 }
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85
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86 public void changeCipher(BlockCipher bc)
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87 {
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88 this.currentCipher = bc;
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89 blockSize = bc.getBlockSize();
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90 buffer = new byte[blockSize];
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91 enc = new byte[blockSize];
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92 pos = 0;
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93 }
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94
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95 private void writeBlock() throws IOException
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96 {
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97 try
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98 {
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99 currentCipher.transformBlock(buffer, 0, enc, 0);
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100 }
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101 catch (Exception e)
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102 {
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103 throw new IOException("Error while decrypting block.", e);
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104 }
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105
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106 internal_write(enc, 0, blockSize);
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107 pos = 0;
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108 }
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109
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110 public void write(byte[] src, int off, int len) throws IOException
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111 {
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112 while (len > 0)
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113 {
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114 int avail = blockSize - pos;
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115 int copy = Math.min(avail, len);
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116
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117 System.arraycopy(src, off, buffer, pos, copy);
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118 pos += copy;
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119 off += copy;
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120 len -= copy;
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121
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122 if (pos >= blockSize)
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123 {
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124 writeBlock();
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125 }
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126 }
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127 }
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128
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129 public void write(int b) throws IOException
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130 {
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131 buffer[pos++] = (byte) b;
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132 if (pos >= blockSize)
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133 {
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134 writeBlock();
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135 }
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136 }
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137
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138 public void writePlain(int b) throws IOException
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139 {
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140 if (pos != 0)
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141 {
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142 throw new IOException("Cannot write plain since crypto buffer is not aligned.");
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143 }
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144 internal_write(b);
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145 }
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146
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147 public void writePlain(byte[] b, int off, int len) throws IOException
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148 {
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149 if (pos != 0)
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150 {
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151 throw new IOException("Cannot write plain since crypto buffer is not aligned.");
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152 }
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diff changeset
153 internal_write(b, off, len);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
154 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
155 }