i2d_X509_PUBKEY
LCRYPTO_ALIAS(i2d_X509_PUBKEY);
ret = i2d_X509_PUBKEY(xpk, out);
der_len = i2d_X509_PUBKEY(pkey, &der);
LCRYPTO_USED(i2d_X509_PUBKEY);
int i2d_X509_PUBKEY(X509_PUBKEY *a, unsigned char **out);
if ((der_len = i2d_X509_PUBKEY(rk->spki, &der)) <= 0) {
if ((der_len = i2d_X509_PUBKEY(pubkey, &der)) <= 0) {