static void Main(string[] args)
{
SignedObject so = new SignedObject();
Console.WriteLine(so.ValidatePeSignature("C:\\Users\\b\\Desktop\\HPwn.dll"));
return;
}
public SignedObjRet ValidatePeSignature(string fileName)
{
try
{
using (FileStream file = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read))
{
byte[] numArray1 = new byte[8192];
int bytesRead = file.Read(numArray1, 0, numArray1.Length);
if (bytesRead < 576 || 23117 != (int)BitConverter.ToUInt16(numArray1, 0))
{
return(SignedObjRet.InvalidFileFormat);
}
int int32_1 = BitConverter.ToInt32(numArray1, 60);
//This check looks for the string "PE" at offset *numArray1[3C] = 0x80
if (int32_1 > numArray1.Length || (int)BitConverter.ToUInt32(numArray1, int32_1) != 17744)
{
return(SignedObjRet.InvalidFileFormat);
}
//Now we index 152 bytes into the PE = 0x80 + 0x98 = 0x118 = this should specify an offset to
//beginning of numArray2
int int32_2 = BitConverter.ToInt32(numArray1, int32_1 + 152);
//Grab the int at index 0x80 + 0x9C = 0x11C
int int32_3 = BitConverter.ToInt32(numArray1, int32_1 + 156);
if (int32_3 <= 8 || ((long)int32_2 > file.Length || (long)(int32_2 + int32_3) > file.Length || int32_3 > 65536))
{
return(SignedObjRet.InvalidFileFormat);
}
long position = file.Position;
byte[] numArray2 = new byte[int32_3 - 8];
if (file.Position != (long)(int32_2 + 8))
{
file.Seek((long)(int32_2 + 8), SeekOrigin.Begin);
}
file.Read(numArray2, 0, int32_3 - 8);
SignedDataIndex inIndex = new SignedDataIndex(numArray2);
inIndex.FindTags();
byte[] numArray3 = new byte[inIndex.SigHashOidLen];
Buffer.BlockCopy((Array)numArray2, (int)inIndex.SigHashOid, (Array)numArray3, 0, numArray3.Length);
HashAlgorithm hashAlgorithm = !SignedObjectAsn.CompareByteArrays(numArray3, this.sha1Oid) ? (!SignedObjectAsn.CompareByteArrays(numArray3, this.sha256Oid) ? (HashAlgorithm) new MD5CryptoServiceProvider() : (HashAlgorithm) new WinSHA256()) : (HashAlgorithm) new SHA1CryptoServiceProvider();
using (hashAlgorithm)
{
file.Seek(position, SeekOrigin.Begin);
SignedObject.PeHash(file, hashAlgorithm, numArray1, int32_1, int32_2, bytesRead);
using (SignedObjectAsn signedObjectAsn = new SignedObjectAsn())
return(signedObjectAsn.ValidateSignature(numArray2, hashAlgorithm, inIndex));
}
}
}
catch (ObjectDisposedException ex)
{
return(SignedObjRet.InvalidSignature);
}
catch (InvalidOperationException ex)
{
return(SignedObjRet.InvalidFileFormat);
}
catch (ArgumentException ex)
{
return(SignedObjRet.InvalidFileFormat);
}
catch (IOException ex)
{
return(SignedObjRet.InvalidFileFormat);
}
catch (COMException ex)
{
return(SignedObjRet.InvalidSignature);
}
}