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);
}