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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:
       "YYMMDDhhmmssZ", "YYMMDDhhmmssZ", "YYMMDDhhmmss+hh'mm'",
       "YYMMDDhhmmss-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",
       "YYYYMMDDhhmmss.sZ", "YYYYMMDDhhmmss.s+hh'mm'",
       "YYYYMMDDhhmmss.s-hh'mm'", "YYYYMMDDhhmm+hh'mm'", or
       "YYYYMMDDhhmm-hh'mm'" where ss.s indicates the seconds 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.

       value="$sh$x01$sh$x02$sh$x03" , len=3 -> three bytes octet string

GENERALSTRING
       VALUE contains the generalstring and LEN is the number of octets.

       value="$sh$x01$sh$x02$sh$x03" , len=3 -> three bytes generalstring

       BIT STRING: VALUE contains the bit string organized by bytes and LEN is
       the number of bits.

       value="$sh$xCF" , len=6 -> bit string="110011" (six bits)

CHOICE
       if NAME indicates a choice type, VALUE must specify one of the
       alternatives 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.subject.rdnSequence", "NEW", 1);

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

       result=asn1_write_value(cert,
       "tbsCertificate.subject.rdnSequence.?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) 2006-2022 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.  As an alternative you
       may obtain the manual from:

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

libtasn1                            4.19.0                 asn1_write_value(3)