asn1_read_value man page on Oracle
asn1_read_value(3) libtasn1 asn1_read_value(3)
asn1_read_value - API function
int asn1_read_value(asn1_node root, const char * name, void * ivalue,
int * len);
pointer to a structure.
const char * name
the name of the element inside a structure that you want to
void * ivalue
vector that will contain the element's content, must be a
pointer to memory cells already allocated.
int * len number of bytes of *value: value..value[len-1]. Initialy
holds the sizeof value.
Returns the value of one element inside a structure.
If an element is OPTIONAL and the function "read_value" returns
ASN1_ELEMENT_NOT_FOUND, it means that this element wasn't present in
the der encoding that created the structure. The first element of a
SEQUENCE_OF or SET_OF is named "?1". The second one "?2" and so on.
VALUE will contain a two's complement form integer.
integer=-1 -> value=0xFF , len=1. integer=1 -> value=0x01 ,
As INTEGER (but only with not negative numbers).
VALUE will be the null terminated string "TRUE" or "FALSE" and LEN=5 or
VALUE will be a null terminated string with each number separated by a
dot (i.e. "188.8.131.523.1").
LEN = strlen(VALUE)+1
VALUE will be a null terminated string in one of these formats: "YYMMD‐
Dhhmmss+hh'mm'" or "YYMMDDhhmmss-hh'mm'". LEN=strlen(VALUE)+1.
VALUE will be a null terminated string in the same format used to set
VALUE will contain the octet string and LEN will be the number of
VALUE will contain the generalstring and LEN will be the number of
VALUE will contain the bit string organized by bytes and LEN will be
the number of bits.
If NAME indicates a choice type, VALUE will specify the alternative
If NAME indicates an any type, VALUE will indicate the DER encoding of
the structure actually used.
ASN1_SUCCESS if value is returned, ASN1_ELEMENT_NOT_FOUND if name is
not a valid element, ASN1_VALUE_NOT_FOUND if there isn't any value for
the element selected, and ASN1_MEM_ERROR if The value vector isn't big
enough to store the result, and in this case len will contain the num‐
ber of bytes needed.
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.
The full documentation for libtasn1 is maintained as a Texinfo manual.
If the info and libtasn1 programs are properly installed at your site,
should give you access to the complete manual.
libtasn1 3.3 asn1_read_value(3)
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