FC_Sign - sign a block of data.
CK_RV FC_Sign( CK_SESSION_HANDLE hSession, CK_BYTE_PTR pData, CK_ULONG usDataLen, CK_BYTE_PTR pSignature, CK_ULONG_PTR pusSignatureLen );
hSessionpDatausDataLenpSignaturepusSignatureLenFC_Sign signs a message in a single operation according to the attributes of the previous call to FC_SignInit.
A user must log into the token (to assume the NSS User role) before calling FC_Sign.