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annotate Encryption/ZipAESStream.cs @ 1:94e25b786321

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Re #311: can't read ZIP file packed by Linux app Archive Manager/File Roller Initial commit of clean SharpZipLib 0860 source. Only change is build paths.
author IBBoard <dev@ibboard.co.uk>
date Sat, 30 Oct 2010 14:03:17 +0000
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children
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1
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1 //
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2 // ZipAESStream.cs
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3 //
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4 // Copyright 2009 David Pierson
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5 //
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6 // This program is free software; you can redistribute it and/or
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7 // modify it under the terms of the GNU General Public License
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8 // as published by the Free Software Foundation; either version 2
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9 // of the License, or (at your option) any later version.
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10 //
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11 // This program is distributed in the hope that it will be useful,
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12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 // GNU General Public License for more details.
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15 //
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16 // You should have received a copy of the GNU General Public License
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17 // along with this program; if not, write to the Free Software
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18 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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19 //
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20 // Linking this library statically or dynamically with other modules is
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21 // making a combined work based on this library. Thus, the terms and
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22 // conditions of the GNU General Public License cover the whole
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23 // combination.
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24 //
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25 // As a special exception, the copyright holders of this library give you
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26 // permission to link this library with independent modules to produce an
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27 // executable, regardless of the license terms of these independent
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28 // modules, and to copy and distribute the resulting executable under
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29 // terms of your choice, provided that you also meet, for each linked
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30 // independent module, the terms and conditions of the license of that
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31 // module. An independent module is a module which is not derived from
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32 // or based on this library. If you modify this library, you may extend
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33 // this exception to your version of the library, but you are not
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34 // obligated to do so. If you do not wish to do so, delete this
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35 // exception statement from your version.
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36 //
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37
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38 #if !NET_1_1 && !NETCF_2_0
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39
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40 using System;
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41 using System.IO;
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42 using System.Security.Cryptography;
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43
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44 namespace ICSharpCode.SharpZipLib.Encryption {
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45
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46 // Based on information from http://www.winzip.com/aes_info.htm
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47 // and http://www.gladman.me.uk/cryptography_technology/fileencrypt/
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48
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49 /// <summary>
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50 /// Encrypts and decrypts AES ZIP
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51 /// </summary>
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52 internal class ZipAESStream : CryptoStream {
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53
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54 /// <summary>
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55 /// Constructor
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56 /// </summary>
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57 /// <param name="stream">The stream on which to perform the cryptographic transformation.</param>
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58 /// <param name="transform">Instance of ZipAESTransform</param>
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59 /// <param name="mode">Read or Write</param>
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60 public ZipAESStream(Stream stream, ZipAESTransform transform, CryptoStreamMode mode)
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61 : base(stream, transform, mode) {
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62
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63 _stream = stream;
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64 _transform = transform;
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65 _slideBuffer = new byte[1024];
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66
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67 _blockAndAuth = CRYPTO_BLOCK_SIZE + AUTH_CODE_LENGTH;
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68
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69 // mode:
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70 // CryptoStreamMode.Read means we read from "stream" and pass decrypted to our Read() method.
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71 // Write bypasses this stream and uses the Transform directly.
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72 if (mode != CryptoStreamMode.Read) {
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73 throw new Exception("ZipAESStream only for read");
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74 }
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75 }
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76
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77 // The final n bytes of the AES stream contain the Auth Code.
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78 private const int AUTH_CODE_LENGTH = 10;
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79
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80 private Stream _stream;
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81 private ZipAESTransform _transform;
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82 private byte[] _slideBuffer;
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83 private int _slideBufStartPos;
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84 private int _slideBufFreePos;
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85 // Blocksize is always 16 here, even for AES-256 which has transform.InputBlockSize of 32.
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86 private const int CRYPTO_BLOCK_SIZE = 16;
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87 private int _blockAndAuth;
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88
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89 /// <summary>
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90 /// Reads a sequence of bytes from the current CryptoStream into buffer,
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91 /// and advances the position within the stream by the number of bytes read.
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92 /// </summary>
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93 public override int Read(byte[] outBuffer, int offset, int count) {
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94 int nBytes = 0;
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95 while (nBytes < count) {
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96 // Calculate buffer quantities vs read-ahead size, and check for sufficient free space
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97 int byteCount = _slideBufFreePos - _slideBufStartPos;
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98
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99 // Need to handle final block and Auth Code specially, but don't know total data length.
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100 // Maintain a read-ahead equal to the length of (crypto block + Auth Code).
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101 // When that runs out we can detect these final sections.
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102 int lengthToRead = _blockAndAuth - byteCount;
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103 if (_slideBuffer.Length - _slideBufFreePos < lengthToRead) {
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104 // Shift the data to the beginning of the buffer
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105 int iTo = 0;
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106 for (int iFrom = _slideBufStartPos; iFrom < _slideBufFreePos; iFrom++, iTo++) {
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107 _slideBuffer[iTo] = _slideBuffer[iFrom];
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108 }
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109 _slideBufFreePos -= _slideBufStartPos; // Note the -=
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110 _slideBufStartPos = 0;
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111 }
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112 int obtained = _stream.Read(_slideBuffer, _slideBufFreePos, lengthToRead);
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113 _slideBufFreePos += obtained;
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114
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115 // Recalculate how much data we now have
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116 byteCount = _slideBufFreePos - _slideBufStartPos;
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117 if (byteCount >= _blockAndAuth) {
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118 // At least a 16 byte block and an auth code remains.
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119 _transform.TransformBlock(_slideBuffer,
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120 _slideBufStartPos,
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121 CRYPTO_BLOCK_SIZE,
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122 outBuffer,
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123 offset);
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124 nBytes += CRYPTO_BLOCK_SIZE;
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125 offset += CRYPTO_BLOCK_SIZE;
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126 _slideBufStartPos += CRYPTO_BLOCK_SIZE;
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127 } else {
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128 // Last round.
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129 if (byteCount > AUTH_CODE_LENGTH) {
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130 // At least one byte of data plus auth code
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131 int finalBlock = byteCount - AUTH_CODE_LENGTH;
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132 _transform.TransformBlock(_slideBuffer,
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133 _slideBufStartPos,
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134 finalBlock,
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135 outBuffer,
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136 offset);
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137
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138 nBytes += finalBlock;
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139 _slideBufStartPos += finalBlock;
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140 }
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141 else if (byteCount < AUTH_CODE_LENGTH)
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142 throw new Exception("Internal error missed auth code"); // Coding bug
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143 // Final block done. Check Auth code.
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144 byte[] calcAuthCode = _transform.GetAuthCode();
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145 for (int i = 0; i < AUTH_CODE_LENGTH; i++) {
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146 if (calcAuthCode[i] != _slideBuffer[_slideBufStartPos + i]) {
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147 throw new Exception("AES Authentication Code does not match. This is a super-CRC check on the data in the file after compression and encryption. \r\n"
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148 + "The file may be damaged.");
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149 }
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150 }
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151
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152 break; // Reached the auth code
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153 }
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154 }
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155 return nBytes;
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156 }
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157
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158 /// <summary>
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159 /// Writes a sequence of bytes to the current stream and advances the current position within this stream by the number of bytes written.
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160 /// </summary>
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161 /// <param name="buffer">An array of bytes. This method copies count bytes from buffer to the current stream. </param>
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162 /// <param name="offset">The byte offset in buffer at which to begin copying bytes to the current stream. </param>
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163 /// <param name="count">The number of bytes to be written to the current stream. </param>
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164 public override void Write(byte[] buffer, int offset, int count) {
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165 // ZipAESStream is used for reading but not for writing. Writing uses the ZipAESTransform directly.
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166 throw new NotImplementedException();
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167 }
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168 }
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169 }
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170 #endif