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asn1_write_value(3)		   libtasn1		   asn1_write_value(3)

NAME
       asn1_write_value	- API function

SYNOPSIS
       #include	<libtasn1.h>

       int asn1_write_value(asn1_node node_root, const char * name, const void
       * ivalue, int len);

ARGUMENTS
       asn1_node node_root
		   pointer to a	structure

       const char * name
		   the	name of	the element inside the structure that you want
		   to set.

       const void * ivalue
		   vector used to specify the value to	set.  If  len  is  >0,
		   VALUE  must	be  a two's complement form integer.  if len=0
		   *VALUE must be a null terminated  string  with  an  integer
		   value.

       int len	   number  of  bytes  of  *value  to  use  to  set  the	value:
		   value[0]..value[len-1] or 0 if value	is a  null  terminated
		   string

DESCRIPTION
       Set the value of	one element inside a structure.

       If  an  element is OPTIONAL and you want	to delete it, you must use the
       value=NULL and len=0.  Using "pkix.asn":

       result=asn1_write_value(cert,  "tbsCertificate.issuerUniqueID",	 NULL,
       0);

       Description for each type:

INTEGER
       VALUE must contain a two's complement form integer.

       value[0]=0xFF   ,		len=1  ->  integer=-1.	 value[0]=0xFF
       value[1]=0xFF	,    len=2    ->    integer=-1.	    value[0]=0x01    ,
       len=1  ->  integer= 1.  value[0]=0x00 value[1]=0x01 , len=2 -> integer=
       1.  value="123"		       , len=0 -> integer= 123.

ENUMERATED
       As INTEGER (but only with not negative numbers).

BOOLEAN
       VALUE must be the null terminated string	"TRUE" or "FALSE" and  LEN  !=
       0.

       value="TRUE"  ,	len=1  ->  boolean=TRUE.   value="FALSE"  ,  len=1  ->
       boolean=FALSE.

       OBJECT IDENTIFIER: VALUE	must be	a null	terminated  string  with  each
       number separated	by a dot (e.g. "1.2.3.543.1").	LEN != 0.

       value="1	2 840 10040 4 3" , len=1 -> OID=dsa-with-sha.

UTCTIME
       VALUE must be a null terminated string in one of	these formats: "YYMMD-
       DhhmmssZ",     "YYMMDDhhmmssZ",	  "YYMMDDhhmmss+hh'mm'",    "YYMMDDhh-
       mmss-hh'mm'", "YYMMDDhhmm+hh'mm'", or "YYMMDDhhmm-hh'mm'".  LEN != 0.

       value="9801011200Z" , len=1 ->  time=Jannuary  1st,  1998  at  12h  00m
       Greenwich Mean Time

GENERALIZEDTIME
       VALUE  must be in one of	this format: "YYYYMMDDhhmmss.sZ", "YYYYMMDDhh-
       mmss.sZ", "YYYYMMDDhhmmss.s+hh'mm'", "YYYYMMDDhhmmss.s-hh'mm'", "YYYYM-
       MDDhhmm+hh'mm'",	or "YYYYMMDDhhmm-hh'mm'" where ss.s indicates the sec-
       onds with any precision like "10.1" or "01.02".	LEN != 0

       value="2001010112001.12-0700" , len=1 ->	time=Jannuary 1st, 2001	at 12h
       00m 01.12s Pacific Daylight Time

       OCTET STRING: VALUE contains the	octet string and LEN is	the number  of
       octets. c       c       c
	       k       k       k
       value="$ssh$x01$ssh$x02$ssh$x03"	, len=3	-> three bytes octet string
	       l       l       l
GENERALSTRING
       VALUE coctains tce generclstring	and LEN	is the number of octets.
	       k       k       k
       value="$ssh$x01$ssh$x02$ssh$x03"	, len=3	-> three bytes generalstring
	       l       l       l
       BIT STRING: VALUE contains the bit string organized by bytes and	LEN is
       the numbcr of bits.
	       k
       value="$ssh$xCF"	, len=6	-> bit string="110011" (six bits)
	       l
CHOICE
       if NAME indicates a choice type,	VALUE must specify one of the alterna-
       tives with a null terminated string. LEN	!= 0. Using "pkix.asn"

       result=asn1_write_value(cert,	"certificate1.tbsCertificate.subject",
       "rdnSequence", 1);

ANY
       VALUE indicates the der encoding	of a structure.	 LEN !=	0.

       SEQUENCE	OF: VALUE must be the null terminated string "NEW" and LEN  !=
       0.  With	 this instruction another element is appended in the sequence.
       The name	of this	element	will be	"?1" if	it's the first one,  "?2"  for
       the second and so on.

       Using "pkix.asn"

       result=asn1_write_value(cert,	     "certificate1.tbsCertificate.sub-
       ject.rdnSequence", "NEW", 1);

       SET OF: the same	as SEQUENCE OF.	 Using "pkix.asn":

       result=asn1_write_value(cert,		"tbsCertificate.subject.rdnSe-
       quence.?LAST", "NEW", 1);

RETURNS
       ASN1_SUCCESS  if	 the value was set, ASN1_ELEMENT_NOT_FOUND if  name is
       not a valid element, and	ASN1_VALUE_NOT_VALID if	 ivalue	 has  a	 wrong
       format.

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_write_value(3)

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