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X509_get_pubkey(3)                  OpenSSL                 X509_get_pubkey(3)

       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

       libcrypto, -lcrypto

        #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(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);

       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.

       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.

       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.

       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),

       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

1.1.1i                            2018-09-23                X509_get_pubkey(3)