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Title "X509 7" 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" An X.509 certificate is a structured grouping of information about an individual, a device, or anything one can imagine. An 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 attribute), 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_\s-1XXX\s0, d2i_X509_\s-1XXX\s0, and i2d_X509_\s-1XXX\s0 functions handle X.509 certificates, with some exceptions, shown below.

\fBX509_CRL_\s-1XXX\s0, d2i_X509_CRL_\s-1XXX\s0, and i2d_X509_CRL_\s-1XXX\s0 functions handle X.509 CRLs.

\fBX509_REQ_\s-1XXX\s0, d2i_X509_REQ_\s-1XXX\s0, and i2d_X509_REQ_\s-1XXX\s0 functions handle PKCS#10 certificate requests.

\fBX509_NAME_\s-1XXX\s0 functions handle certificate names.

\fBX509_ATTRIBUTE_\s-1XXX\s0 functions handle certificate attributes.

\fBX509_EXTENSION_\s-1XXX\s0 functions handle certificate extensions.

Header "SEE ALSO" \fBX509_NAME_ENTRY_get_object\|(3), \fBX509_NAME_add_entry_by_txt\|(3), \fBX509_NAME_add_entry_by_NID\|(3), \fBX509_NAME_print_ex\|(3), \fBX509_NAME_new\|(3), \fBd2i_X509\|(3), \fBd2i_X509_ALGOR\|(3), \fBd2i_X509_CRL\|(3), \fBd2i_X509_NAME\|(3), \fBd2i_X509_REQ\|(3), \fBd2i_X509_SIG\|(3), \fBX509v3\|(3), \fBcrypto\|(7) Header "COPYRIGHT" Copyright 2003-2021 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.