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asn1_der_decoding_startEnd(3)	   libtasn1	 asn1_der_decoding_startEnd(3)

NAME
       asn1_der_decoding_startEnd - API	function

SYNOPSIS
       #include	<libtasn1.h>

       int  asn1_der_decoding_startEnd(asn1_node  element,  const void * ider,
       int ider_len, const char	* name_element,	int * start, int * end);

ARGUMENTS
       asn1_node element
		   pointer to an ASN1 element

       const void * ider
		   vector that contains	the DER	encoding.

       int ider_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.

       One example is the sequence "tbsCertificate" inside  an	X509  certifi-
       cate.

       Note  that since	libtasn1 3.7 the  ider and  ider_len parameters	can be
       omitted,	if the element is already decoded using	asn1_der_decoding().

RETURNS
       ASN1_SUCCESS if DER encoding OK,	ASN1_ELEMENT_NOT_FOUND if  ELEMENT  is
       asn1_node EMPTY or  name_element	is not a valid element,	ASN1_TAG_ERROR
       or  ASN1_DER_ERROR if the der encoding doesn't match the	structure ELE-
       MENT.

COPYRIGHT
       Copyright (C) 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 no-
       tice 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.  As an  alternative  you
       may obtain the manual from:

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

libtasn1			    4.20.0	 asn1_der_decoding_startEnd(3)

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