It is easier to just pad your prehashed data manually according to PKCS#1 and 
then do a raw encrypt with the private key:

<code>

CryptoPP::RSA::PrivateKey mPrivateKey;

length = mPrivateKey.GetModulus().ByteCount();
byte tmp[length];

Pad(tmp, length, inData, inLength);                            //Pad the data
CryptoPP::Integer m(tmp, length);                              //Encode the 
message
CryptoPP::Integer c = mPrivateKey.ApplyFunction(m);            // Calculate c
CryptoPP::Integer cInv = mPrivateKey.CalculateInverse(rng, c); //Inverse c
for (int i = 0; i < cInv.ByteCount() ; i++)
  tmp[i] = cInv.GetByte(i);

outData = tmp;

</code>

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