asn1_der_decoding_startEnd(3)

NAME
asn1_der_decoding_startEnd - Find the start and end point of an element in a DER encoding string.

SYNOPSIS
#include <libtasn1.h>

asn1_retCode asn1_der_decoding_startEnd(ASN1_TYPE element, const void * ider, int len, const char * name_element, int * start, int * end);

ARGUMENTS

ASN1_TYPE element
    pointer to an ASN1 element

const void * ider
    vector that contains the DER encoding.

int len
    number of bytes of *ider: ider[0]..ider[len-1]

const char * name_element
    an element of NAME structure.

int * start
    the position of the first byte of NAME_ELEMENT decoding (ider[*start])

int * end
    the position of the last byte of NAME_ELEMENT decoding (ider[*end])

DESCRIPTION
Find the start and end point of an element in a DER encoding string. I mean that if you have a der encoding and you have already used the function "asn1_der_decoding" to fill a structure, it may happen that you want to find the piece of string concerning an element of the structure.

EXAMPLE
the sequence "tbsCertificate" inside an X509 certificate.

RETURNS

ASN1_SUCCESS
DER encoding OK.

ASN1_ELEMENT_NOT_FOUND
ELEMENT is ASN1_TYPE EMPTY or NAME_ELEMENT is not a valid element. ASN1_TAG_ERROR,ASN1_DER_ERROR: the der encoding doesn't match the structure ELEMENT.

COPYRIGHT
Copyright © 2006, 2007, 2008, 2009 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.

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.