asn1_length_der man page

asn1_length_der — API function


#include <libtasn1.h>

void asn1_length_der(unsigned long int len, unsigned char * der, int * der_len);


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]).


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 .

See Also

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:


4.8 libtasn1