X509_NAME_get0_der.3ssl man page
X509_NAME_get0_der — get X509_NAME DER encoding
int X509_NAME_get0_der(X509_NAME *nm, const unsigned char **pder, size_t *pderlen)
The function X509_NAME_get0_der() returns an internal pointer to the encoding of an X509_NAME structure in *pder and consisting of *pderlen bytes. It is useful for applications that wish to examine the encoding of an X509_NAME structure without copying it.
The function X509_NAME_get0_der() returns 1 for success and 0 if an error occurred.
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