asn1_der_decoding_startEnd

Section: libtasn1 (3)
Updated: 2.3
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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.