static byte[] HashStream(Stream stream, ImageWriter writer, out int strong_name_pointer) { const int buffer_size = 8192; var text = writer.GetSection(".text"); var header_size = (int) writer.GetHeaderSize (); var text_section_pointer = (int) text.PointerToRawData; var strong_name_directory = writer.GetStrongNameSignatureDirectory (); if (strong_name_directory.Size == 0) throw new InvalidOperationException (); strong_name_pointer = (int) (text_section_pointer + (strong_name_directory.VirtualAddress - text.VirtualAddress)); var strong_name_length = (int) strong_name_directory.Size; var sha1 = new SHA1Managed (); var buffer = new byte [buffer_size]; using (var crypto_stream = new CryptoStream (Stream.Null, sha1, CryptoStreamMode.Write)) { stream.Seek (0, SeekOrigin.Begin); CopyStreamChunk (stream, crypto_stream, buffer, 0xd8); crypto_stream.Write (new byte[4], 0, 4); stream.Seek (4, SeekOrigin.Current); CopyStreamChunk (stream, crypto_stream, buffer, header_size - 0xd8 - 4); stream.Seek (text_section_pointer, SeekOrigin.Begin); CopyStreamChunk (stream, crypto_stream, buffer, (int) strong_name_pointer - text_section_pointer); stream.Seek (strong_name_length, SeekOrigin.Current); CopyStreamChunk (stream, crypto_stream, buffer, (int)(text.SizeOfRawData - (strong_name_pointer + strong_name_length - text.PointerToRawData))); foreach(Section sect in writer.sections) { if (sect.Name == ".text") continue; stream.Seek (sect.PointerToRawData, SeekOrigin.Begin); CopyStreamChunk (stream, crypto_stream, buffer, (int) sect.SizeOfRawData); } } return sha1.Hash; }