NAME
a2d_ASN1_OBJECT —
DER content octets of an ASN.1 object
identifier
SYNOPSIS
#include
<openssl/asn1.h>
int
a2d_ASN1_OBJECT(unsigned char
*der_out, int olen, const char
*val_in, int ilen);
DESCRIPTION
a2d_ASN1_OBJECT()
accepts an ASCII string val_in of
ilen bytes and interprets it as the numerical form of
an ASN.1 object identifier. It writes the content octets of the DER encoding
of the object identifier to the buffer der_out which
is olen bytes long. The identifier and length octets
of the DER encoding are not written.
If ilen is -1, the strlen(3) of val_in is used instead.
If der_out is a NULL
pointer, writing the content octets is skipped and only the return value is
calculated.
RETURN VALUES
a2d_ASN1_OBJECT() returns the number of
content octets that were or would be written or 0 if
ilen is 0, if val_in is not a
valid representation of an object identifier, if memory allocation fails, or
if the number of content octets would be larger than
olen.
SEE ALSO
STANDARDS
ITU-T Recommendation X.690, also known as ISO/IEC 8825-1: Information technology - ASN.1 encoding rules: Specification of Basic Encoding Rules (BER), Canonical Encoding Rules (CER) and Distinguished Encoding Rules (DER), section 8.19: Encoding of an object identifier value
HISTORY
a2d_ASN1_OBJECT() first appeared in SSLeay
0.8.0 and has been available since OpenBSD 2.4.