DerDecodeSPKI
extern KMF_RETURN DerDecodeSPKI(KMF_DATA *, KMF_X509_SPKI *);
KMF_RETURN DerDecodeSPKI(KMF_DATA *, KMF_X509_SPKI *);
ret = DerDecodeSPKI(&KeyData, spki_ptr);
ret = DerDecodeSPKI(derkey, &spki);
ret = DerDecodeSPKI(&derkey, &spki);
ret = DerDecodeSPKI(&KeyData, spki_ptr);