Tribblix: manual page: asn1_write

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.