public static PkwareTraditionalEncryptionData ForRead(string password, ZipFileEntry header, byte[] encryptionHeader) { var encryptor = new PkwareTraditionalEncryptionData(password); byte[] plainTextHeader = encryptor.Decrypt(encryptionHeader, encryptionHeader.Length); if (plainTextHeader[11] != (byte)((header.Crc >> 24) & 0xff)) { if (!FlagUtility.HasFlag(header.Flags, HeaderFlags.UsePostDataDescriptor)) { throw new CryptographicException("The password did not match."); } if (plainTextHeader[11] != (byte)((header.LastModifiedTime >> 8) & 0xff)) { throw new CryptographicException("The password did not match."); } } return encryptor; }
public static PkwareTraditionalEncryptionData ForRead(string password, ZipFileEntry header, byte[] encryptionHeader) { PkwareTraditionalEncryptionData data = new PkwareTraditionalEncryptionData(password); byte[] buffer = data.Decrypt(encryptionHeader, encryptionHeader.Length); if (buffer[11] != ((byte) ((header.Crc >> 0x18) & 0xff))) { if (!FlagUtility.HasFlag<HeaderFlags>(header.Flags, HeaderFlags.UsePostDataDescriptor)) { throw new CryptographicException("The password did not match."); } if (buffer[11] != ((byte) ((header.LastModifiedTime >> 8) & 0xff))) { throw new CryptographicException("The password did not match."); } } return data; }
private void LoadHeader(ZipFileEntry entryHeader, Stream stream) { if (FlagUtility.HasFlag(entryHeader.Flags, HeaderFlags.Encrypted)) { if (!entryHeader.IsDirectory && entryHeader.CompressedSize == 0 && FlagUtility.HasFlag(entryHeader.Flags, HeaderFlags.UsePostDataDescriptor)) { throw new NotSupportedException( "SharpCompress cannot currently read non-seekable Zip Streams with encrypted data that has been written in a non-seekable manner."); } if (password == null) { throw new CryptographicException("No password supplied for encrypted zip."); } if (entryHeader.CompressionMethod != ZipCompressionMethod.WinzipAes) { byte[] buffer = new byte[12]; stream.Read(buffer, 0, 12); entryHeader.PkwareTraditionalEncryptionData = PkwareTraditionalEncryptionData.ForRead(password, entryHeader, buffer); entryHeader.CompressedSize -= 12; } else { #if PORTABLE || NETFX_CORE throw new NotSupportedException("Cannot decrypt Winzip AES with Silverlight or WP7."); #else var data = entryHeader.Extra.Where(x => x.Type == ExtraDataType.WinZipAes).SingleOrDefault(); WinzipAesKeySize keySize = (WinzipAesKeySize) data.DataBytes[4]; byte[] salt = new byte[WinzipAesEncryptionData.KeyLengthInBytes(keySize)/2]; byte[] passwordVerifyValue = new byte[2]; stream.Read(salt, 0, salt.Length); stream.Read(passwordVerifyValue, 0, 2); entryHeader.WinzipAesEncryptionData = new WinzipAesEncryptionData(keySize, salt, passwordVerifyValue, password); entryHeader.CompressedSize -= (uint) (salt.Length + 2); #endif } } if (entryHeader.IsDirectory) { return; } //if (FlagUtility.HasFlag(entryHeader.Flags, HeaderFlags.UsePostDataDescriptor)) //{ // entryHeader.PackedStream = new ReadOnlySubStream(stream); //} //else //{ switch (mode) { case StreamingMode.Seekable: { entryHeader.DataStartPosition = stream.Position; stream.Position += entryHeader.CompressedSize; } break; case StreamingMode.Streaming: { entryHeader.PackedStream = stream; } break; default: { throw new InvalidFormatException("Invalid StreamingMode"); } } //} }
internal ZipFilePart(ZipFileEntry header, Stream stream) { Header = header; header.Part = this; this.BaseStream = stream; }
internal StreamingZipFilePart(ZipFileEntry header, Stream stream) : base(header, stream) { }
private void LoadHeader(ZipFileEntry entryHeader, Stream stream) { if (FlagUtility.HasFlag<HeaderFlags>(entryHeader.Flags, HeaderFlags.Encrypted)) { if ((!entryHeader.IsDirectory && (entryHeader.CompressedSize == 0)) && FlagUtility.HasFlag<HeaderFlags>(entryHeader.Flags, HeaderFlags.UsePostDataDescriptor)) { throw new NotSupportedException("SharpCompress cannot currently read non-seekable Zip Streams with encrypted data that has been written in a non-seekable manner."); } if (this.password == null) { throw new CryptographicException("No password supplied for encrypted zip."); } if (entryHeader.CompressionMethod == ZipCompressionMethod.WinzipAes) { throw new NotSupportedException("Cannot decrypt Winzip AES with Silverlight or WP7."); } byte[] buffer = new byte[12]; stream.Read(buffer, 0, 12); entryHeader.PkwareTraditionalEncryptionData = PkwareTraditionalEncryptionData.ForRead(this.password, entryHeader, buffer); entryHeader.CompressedSize -= 12; } if (!entryHeader.IsDirectory) { switch (this.mode) { case StreamingMode.Streaming: entryHeader.PackedStream = stream; return; case StreamingMode.Seekable: entryHeader.DataStartPosition = new long?(stream.Position); stream.Position += entryHeader.CompressedSize; return; } throw new InvalidFormatException("Invalid StreamingMode"); } }