public static void VmDecrypt(Byte[] buffer, String password)
{
DropSacaraVm();
// prepare variables in order to be passed to the VM code
var key = Encoding.Default.GetBytes(password);
var passwordBuffer = Encoding.Default.GetBytes(password);
var bufferPtr = GCHandle.Alloc(buffer, GCHandleType.Pinned);
var keyPtr = GCHandle.Alloc(key, GCHandleType.Pinned);
// execute the encryption routine
using (var vm = new SacaraVm())
{
var index = 0;
vm.LocalVarSet(index++, bufferPtr.AddrOfPinnedObject().ToInt32());
vm.LocalVarSet(index++, buffer.Length);
vm.LocalVarSet(index++, keyPtr.AddrOfPinnedObject().ToInt32());
vm.LocalVarSet(index++, key.Length);
vm.Run(_deEncryptionCode);
}
}
public static void Main(string[] args)
{
var code = @"
proc main
inc some_variable
byte 0x41, 0x41 /* this will generates an invalid instruction, raising an error */
halt
endp
";
var assembler = new SacaraAssembler();
var vmCode = assembler.Assemble(code);
Console.WriteLine(vmCode);
// run the buggy code
using (var vm = new SacaraVm())
{
vm.SetErrorHandler(HandleError);
vm.Run(vmCode);
}
Debug.Assert(_errorRaised);
}