x509(3)

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

     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)

1.0.2t               Last change: 2019-09-10                    1