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Manual Section... (3) - page: asn1_write_value

 

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 -> 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

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, 2009 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.


 

Index

NAME
SYNOPSIS
ARGUMENTS
DESCRIPTION
DESCRIPTION FOR EACH TYPE
INTEGER
ENUMERATED
BOOLEAN
OBJECT IDENTIFIER
UTCTIME
GENERALIZEDTIME
OCTET STRING
GENERALSTRING
BIT STRING
CHOICE
ANY
SEQUENCE OF
SET OF
RETURNS
ASN1_SUCCESS
ASN1_ELEMENT_NOT_FOUND
ASN1_VALUE_NOT_VALID
COPYRIGHT
SEE ALSO

This document was created by man2html, using the manual pages.
Time: 15:27:39 GMT, June 11, 2010

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