vector that contains the DER encoding of the whole structure.
number of bytes of *der: der..der[len-1]
char * errorDescription
null-terminated string contains details when an
Fill the element named ELEMENTNAME with values of a DER encoding
string. The structure must just be created with function
asn1_create_element(). The DER vector must contain the encoding
string of the whole STRUCTURE. If an error occurs during the
decoding procedure, the *STRUCTURE is deleted and set equal to
ASN1_SUCCESS if DER encoding OK, ASN1_ELEMENT_NOT_FOUND
if ELEMENT is ASN1_TYPE_EMPTY or elementName == NULL, and
ASN1_TAG_ERROR or ASN1_DER_ERROR if the der encoding doesn't
match the structure structure (*ELEMENT deleted).