#include
ASN1_OBJECT *d2i_ASN1_OBJECT(ASN1_OBJECT **a, unsigned char **pp, long length); int i2d_ASN1_OBJECT(ASN1_OBJECT *a, unsigned char **pp);
Othewise these behave in a similar way to _d_2_i___X_5_0_9_(_) and _i_2_d___X_5_0_9_(_) described in the _d_2_i___X_5_0_9(3) manual page.