CK_RV FC_DecryptInit( CK_SESSION_HANDLE hSession, CK_MECHANISM_PTR pMechanism, CK_OBJECT_HANDLE hKey );
[in] session handle.
[in] mechanism to be used for the subsequent decryption operation.
[in] handle of the key to be used.
FC_DecryptInit initializes a decryption operation.
A user must log into the token (to assume the NSS User role) before calling