Verify signature question

[Voronkov Konstantin]

Hello All!

I have a problem when verifying a signature.
What have I done wrong and why my stack breaks?

bool f(PCBYTE pSignature, int signatureSize,
PCBYTE pModulus, int pModulusSize,
PCBYTE pKey, int pKeySize,
PCBYTE pMessage, int pMessageSize)
{
  StringSource signature(pSignature, signatureSize, true, new ByteQueue);
  RSASSA_PKCS1v15_SHA_Verifier *ppub;
  VerifierFilter *verifierFilter;

   ppub = new RSASSA_PKCS1v15_SHA_Verifier(Integer(pModulus, pModulusSize),
Integer(pKey, pKeySize));

  if(signature.MaxRetrievable() != ppub->SignatureLength())
  {
   delete ppub;
   return false;
  }
  SecByteBlock sb_signature(ppub->SignatureLength());
  signature.Get(sb_signature, sb_signature.size);
  verifierFilter = new VerifierFilter(*ppub);
  verifierFilter->PutSignature(sb_signature);

  StringSource ss(pMessage, pMessageSize, true, verifierFilter);
  byte result = 0;
  ss.Get(result);
  delete ppub;
  return result == 1;
}


Regards,
Voronkov Konstantin
ICQ 40202717