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asn1_write_value(3)		   libtasn1		   asn1_write_value(3)

NAME
       asn1_write_value - Set the value of one element inside a structure.

SYNOPSIS
       #include <libtasn1.h>

       asn1_retCode  asn1_write_value(ASN1_TYPE	 node_root, const char * name,
       const void * ivalue, int len);

ARGUMENTS
       ASN1_TYPE 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  ->	 bool‐
       ean=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 coctains tce octetcstring and LEN is the number of octets.
	       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 number
       of bits.c
	       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
       Set value OK.

ASN1_ELEMENT_NOT_FOUND
       NAME is not a valid element.

ASN1_VALUE_NOT_VALID
       VALUE has a wrong format.

COPYRIGHT
       Copyright © 2006, 2007, 2008 Free Software Foundation, Inc..
       Permission  is  granted	to make and distribute verbatim copies of this
       manual provided the copyright notice and	 this  permission  notice  are
       preserved on all copies.

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.

libtasn1			      1.5		   asn1_write_value(3)

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