libressl-d2i_X509_ATTRIBUTE(3)

libressl-d2i_X509_ATTRIBUTE3

Decode and encode generic x.501 attribute

Usage

Crypto Library (libcrypto, -lcrypto)

#include <openssl/x509.h>

X509_ATTRIBUTE *

d2i_X509_ATTRIBUTE(X509_ATTRIBUTE **val_out, const unsigned char **der_in, long length);

int

i2d_X509_ATTRIBUTE(X509_ATTRIBUTE *val_in, unsigned char **der_out);

Overview

d2i_X509_ATTRIBUTE() and i2d_X509_ATTRIBUTE() decode and encode a generic ASN.1 Attribute structure defined in X.501 section 8.2. For details about the semantics, examples, caveats, and bugs, see ASN1_item_d2i(3).

Return values

d2i_X509_ATTRIBUTE() returns an X509_ATTRIBUTE object or NULL if an error occurs.

i2d_X509_ATTRIBUTE() returns the number of bytes successfully encoded or a negative value if an error occurs.

Standards

ITU-T Recommendation X.501, also known as ISO/IEC 9594-2: Information Technology Open Systems Interconnection The Directory: Models, section 8.2: Overall structure

History

d2i_X509_ATTRIBUTE() and i2d_X509_ATTRIBUTE() first appeared in SSLeay 0.5.1 and have been available since OpenBSD 2.4.

From libressl 4.4.0-1 in Arch Linux 2026-11-01. Parsed by carta from the page's mdoc source.