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X509_GET_VERSION(3)                 OpenSSL                X509_GET_VERSION(3)
NAME
       X509_get_version, X509_set_version, X509_REQ_get_version,
       X509_REQ_set_version, X509_CRL_get_version, X509_CRL_set_version - get
       or set certificate, certificate request or CRL version
SYNOPSIS
        #include <openssl/x509.h>
        long X509_get_version(const X509 *x);
        int X509_set_version(X509 *x, long version);
        long X509_REQ_get_version(const X509_REQ *req);
        int X509_REQ_set_version(X509_REQ *x, long version);
        long X509_CRL_get_version(const X509_CRL *crl);
        int X509_CRL_set_version(X509_CRL *x, long version);
DESCRIPTION
       X509_get_version() returns the numerical value of the version field of
       certificate x. Note: this is defined by standards (X.509 et al) to be
       one less than the certificate version. So a version 3 certificate will
       return 2 and a version 1 certificate will return 0.
       X509_set_version() sets the numerical value of the version field of
       certificate x to version.
       Similarly X509_REQ_get_version(), X509_REQ_set_version(),
       X509_CRL_get_version() and X509_CRL_set_version() get and set the
       version number of certificate requests and CRLs.
NOTES
       The version field of certificates, certificate requests and CRLs has a
       DEFAULT value of v1(0) meaning the field should be omitted for version
       1. This is handled transparently by these functions.
RETURN VALUES
       X509_get_version(), X509_REQ_get_version() and X509_CRL_get_version()
       return the numerical value of the version field.
       X509_set_version(), X509_REQ_set_version() and X509_CRL_set_version()
       return 1 for success and 0 for failure.
SEE ALSO
       d2i_X509(3), ERR_get_error(3), X509_CRL_get0_by_serial(3),
       X509_get0_signature(3), X509_get_ext_d2i(3),
       X509_get_extension_flags(3), X509_get_pubkey(3),
       X509_get_subject_name(3), X509_NAME_add_entry_by_txt(3),
       X509_NAME_ENTRY_get_object(3), X509_NAME_get_index_by_NID(3),
       X509_NAME_print_ex(3), X509_new(3), X509_sign(3), X509V3_get_d2i(3),
       X509_verify_cert(3)
HISTORY
       X509_get_version(), X509_REQ_get_version() and X509_CRL_get_version()
       are functions in OpenSSL 1.1.0, in previous versions they were macros.
COPYRIGHT
       Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved.
       Licensed under the OpenSSL license (the "License").  You may not use
       this file except in compliance with the License.  You can obtain a copy
       in the file LICENSE in the source distribution or at
       <https://www.openssl.org/source/license.html>;.
1.1.1k                            2021-03-25               X509_GET_VERSION(3)