Api function
#include <libtasn1.h>
void asn1_length_der(unsigned long int len, unsigned char * der, int * der_len);
value to convert.
buffer to hold the returned encoding (may be NULL).
number of meaningful bytes of ANS (der[0]..der[der_len-1]).
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 .
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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
info libtasn1
should give you access to the complete manual. As an alternative you may obtain the manual from:
http://www.gnu.org/software/libtasn1/manual/