man x509 – Man page for x509
June 1, 2007 – 1:20 amx509
Section: OpenSSL (3)
Updated: 2003–07–10
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NAME
x509 – X.509 certificate handling
SYNOPSIS
#include <openssl/x509.h>
DESCRIPTION
A X.509 certificate is a structured grouping of information about
an individual, a device, or anything one can imagine. A X.509 CRL
(certificate revocation list) is a tool to help determine if a
certificate is still valid. The exact definition of those can be
found in the X.509 document from ITU–T, or in RFC3280 from PKIX.
In OpenSSL, the type X509 is used to express such a certificate, and
the type X509_CRL is used to express a CRL.
A related structure is a certificate request, defined in PKCS#10 from
RSA Security, Inc, also reflected in RFC2896. In OpenSSL, the type
X509_REQ is used to express such a certificate request.
To handle some complex parts of a certificate, there are the types
X509_NAME (to express a certificate name), X509_ATTRIBUTE (to express
a certificate attributes), X509_EXTENSION (to express a certificate
extension) and a few more.
Finally, there’s the supertype X509_INFO, which can contain a CRL, a
certificate and a corresponding private key.
X509_…, d2i_X509_… and i2d_X509_… handle X.509
certificates, with some exceptions, shown below.
X509_CRL_…, d2i_X509_CRL_… and i2d_X509_CRL_…
handle X.509 CRLs.
X509_REQ_…, d2i_X509_REQ_… and i2d_X509_REQ_…
handle PKCS#10 certificate requests.
X509_NAME_… handle certificate names.
X509_ATTRIBUTE_… handle certificate attributes.
X509_EXTENSION_… handle certificate extensions.
SEE ALSO
X509_NAME_ENTRY_get_object(3),
X509_NAME_add_entry_by_txt(3),
X509_NAME_add_entry_by_NID(3),
X509_NAME_print_ex(3),
X509_NAME_new(3),
d2i_X509(3),
d2i_X509_ALGOR(3),
d2i_X509_CRL(3),
d2i_X509_NAME(3),
d2i_X509_REQ(3),
d2i_X509_SIG(3),
crypto(3),
x509v3(3)
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