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X509_get_pubkey(3)                  OpenSSL                 X509_get_pubkey(3)



NAME
       X509_get_pubkey, X509_get0_pubkey, X509_set_pubkey,
       X509_get_X509_PUBKEY, X509_REQ_get_pubkey, X509_REQ_get0_pubkey,
       X509_REQ_set_pubkey, X509_REQ_get_X509_PUBKEY - get or set certificate
       or certificate request public key

LIBRARY
       libcrypto, -lcrypto

SYNOPSIS
        #include <openssl/x509.h>

        EVP_PKEY *X509_get_pubkey(X509 *x);
        EVP_PKEY *X509_get0_pubkey(const X509 *x);
        int X509_set_pubkey(X509 *x, EVP_PKEY *pkey);
        X509_PUBKEY *X509_get_X509_PUBKEY(const X509 *x);

        EVP_PKEY *X509_REQ_get_pubkey(X509_REQ *req);
        EVP_PKEY *X509_REQ_get0_pubkey(X509_REQ *req);
        int X509_REQ_set_pubkey(X509_REQ *x, EVP_PKEY *pkey);
        X509_PUBKEY *X509_REQ_get_X509_PUBKEY(X509_REQ *x);

DESCRIPTION
       X509_get_pubkey() attempts to decode the public key for certificate x.
       If successful it returns the public key as an EVP_PKEY pointer with its
       reference count incremented: this means the returned key must be freed
       up after use. X509_get0_pubkey() is similar except it does not
       increment the reference count of the returned EVP_PKEY so it must not
       be freed up after use.

       X509_get_X509_PUBKEY() returns an internal pointer to the X509_PUBKEY
       structure which encodes the certificate of x. The returned value must
       not be freed up after use.

       X509_set_pubkey() attempts to set the public key for certificate x to
       pkey. The key pkey should be freed up after use.

       X509_REQ_get_pubkey(), X509_REQ_get0_pubkey(), X509_REQ_set_pubkey()
       and X509_REQ_get_X509_PUBKEY() are similar but operate on certificate
       request req.

NOTES
       The first time a public key is decoded the EVP_PKEY structure is cached
       in the certificate or certificate request itself. Subsequent calls
       return the cached structure with its reference count incremented to
       improve performance.

RETURN VALUES
       X509_get_pubkey(), X509_get0_pubkey(), X509_get_X509_PUBKEY(),
       X509_REQ_get_pubkey() and X509_REQ_get_X509_PUBKEY() return a public
       key or NULL if an error occurred.

       X509_set_pubkey() and X509_REQ_set_pubkey() 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_subject_name(3),
       X509_get_version(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)

COPYRIGHT
       Copyright 2015-2021 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the Apache License 2.0 (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>.



3.0.12                            2023-05-07                X509_get_pubkey(3)