Linux Manual Pages

Free Software * Books

Source Code

Free Media

Linux

asn1_write_value

NAME
SYNOPSIS
ARGUMENTS
DESCRIPTION
INTEGER
ENUMERATED
BOOLEAN
UTCTIME
GENERALIZEDTIME
GENERALSTRING
CHOICE
ANY
RETURNS
COPYRIGHT
SEE ALSO

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. c c c k k k

value="$ssh$x01$ssh$x02$ssh$x03" , len=3 −> three bytes octet string l l l

GENERALSTRING

VALUE contains the generalstring and LEN is the number of octets.c c c 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 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 © 2006-2013 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.

Opportunity

Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.

Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.

Free Software

Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.

Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.

Free Books

The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.

Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.

Education

Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.

Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.