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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
"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
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)