asn1_length_der - API function

       unsigned long int len
                   value to convert.

       unsigned char * der
                   buffer to hold the returned encoding (may be NULL).

       int * der_len
                   number of meaningful bytes of ANS (der[0]..der[der_len-1]).

       Copyright © 2006-2025 Free Software Foundation, Inc..
       Copying and distribution of this file, with or without modification, are permitted in any medium  without
       royalty provided the copyright notice and this notice are preserved.

       Creates  the  DER  encoding  of the provided length value.  The  der buffer must have enough room for the
       output. The maximum length this function will encode is ASN1_MAX_LENGTH_SIZE.

       To know the size of the DER encoding use a NULL value for  der .

       asn1_length_der - API function

       The full documentation for libtasn1 is maintained as a Texinfo manual.  If the info and libtasn1 programs
       are properly installed at your site, the command

              infolibtasn1

       should give you access to the complete manual.  As an alternative you may obtain the manual from:

              https://www.gnu.org/software/libtasn1/manual/

libtasn1                                             4.20.0                                   asn1_length_der(3)

#include<libtasn1.h>voidasn1_length_der(unsignedlongintlen,unsignedchar*der,int*der_len);