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x509(3) OpenSSL x509(3)
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
X5_9_NAME_ENTRY_get_object(3), X5_9_NAME_add_entry_by_txt(3), X5_9_NAME_add_entry_by_NID(3),
X5_9_NAME_print_ex(3), X5_9_NAME_new(3), d2i_X5_9(3), d2i_X5_9_ALGOR(3), d2i_X5_9_CRL(3),
d2i_X5_9_NAME(3), d2i_X5_9_REQ(3), d2i_X5_9_SIG(3), crypto(3), x5_9v3(3)
0.9.8 2003-07-10 x509(3)
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