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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)



50                                               2013-03-05                                          x509(3)