EVP_PKEY2PKCS8
if (!(p8inf = EVP_PKEY2PKCS8(pkey))) {
PKCS8_PRIV_KEY_INFO *p8 = EVP_PKEY2PKCS8(a);
if (!(p8inf = EVP_PKEY2PKCS8(x))) {
if (!(p8 = EVP_PKEY2PKCS8(key)))
p8inf = EVP_PKEY2PKCS8(key);
p8inf = EVP_PKEY2PKCS8(key);
PKCS8_PRIV_KEY_INFO *EVP_PKEY2PKCS8(EVP_PKEY *pkey);