What?s the replacement for code that used SKM_ASN1_SET_OF_i2d in OpenSSL 1.1? The code I?ve got that calls this function is getting the DER encoding of a STACK_OF() as a sorted SET. This STACK_OF() is of a custom ASN1 type; and is a member of another structure that is also a custom ASN1 structure. The call looks like this: int len = SKM_ASN1_SET_OF_i2d(structureName, containingStructure->member, NULL, i2d_structureName, V_ASN1_SET, V_ASN1_UNIVERSAL, IS_SET);* ?structureName? is the typedef?d name of the C struct, which was also passed to the DEFINE_STACK_OF() and DECLARE_ASN1_FUNCTIONS() macros (in OpenSSL < 1.1, it?s DECLARE_STACK_OF(), not DEFINE_STACK_OF() ). ?containingStructure? is a pointer to a C struct, and its member, ?member? is of the type, STACK_OF(structureName). Thanks! TOM * And later it?s called again with a valid pointer of size len instead of NULL for the third parameter, to actually obtain the DER encoding.