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Title "x509 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
x509 - X.509 certificate handling Header "SYNOPSIS" .Vb 1 #include <openssl/x509.h> .Ve Header "DESCRIPTION" A X.509 certificate is a structured grouping of information about an individual, a device, or anything one can imagine. A X.509 \s-1CRL \s0(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 \s-1RFC3280\s0 from \s-1PKIX.\s0 In OpenSSL, the type X509 is used to express such a certificate, and the type X509_CRL is used to express a \s-1CRL.\s0

A related structure is a certificate request, defined in PKCS#10 from \s-1RSA\s0 Security, Inc, also reflected in \s-1RFC2896. \s0 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 \s-1CRL,\s0 a certificate and a corresponding private key.

\fBX509_..., d2i_X509_... and i2d_X509_... handle X.509 certificates, with some exceptions, shown below.

\fBX509_CRL_..., d2i_X509_CRL_... and i2d_X509_CRL_... handle X.509 CRLs.

\fBX509_REQ_..., d2i_X509_REQ_... and i2d_X509_REQ_... handle PKCS#10 certificate requests.

\fBX509_NAME_... handle certificate names.

\fBX509_ATTRIBUTE_... handle certificate attributes.

\fBX509_EXTENSION_... handle certificate extensions.

Header "SEE ALSO" \fIX509_NAME_ENTRY_get_object\|(3), \fIX509_NAME_add_entry_by_txt\|(3), \fIX509_NAME_add_entry_by_NID\|(3), \fIX509_NAME_print_ex\|(3), \fIX509_NAME_new\|(3), \fId2i_X509\|(3), \fId2i_X509_ALGOR\|(3), \fId2i_X509_CRL\|(3), \fId2i_X509_NAME\|(3), \fId2i_X509_REQ\|(3), \fId2i_X509_SIG\|(3), \fIcrypto\|(3), \fIx509v3\|(3)