SSL_CTX_use_certificate, SSL_CTX_use_certificate_ASN1,
       SSL_CTX_use_certificate_file, SSL_use_certificate,
       SSL_use_certificate_ASN1, SSL_use_certificate_file,
       SSL_CTX_use_certificate_chain_file, SSL_use_certificate_chain_file,
       SSL_CTX_use_PrivateKey, SSL_CTX_use_PrivateKey_ASN1,
       SSL_CTX_use_PrivateKey_file, SSL_CTX_use_RSAPrivateKey,
       SSL_CTX_use_RSAPrivateKey_ASN1, SSL_CTX_use_RSAPrivateKey_file,
       SSL_use_PrivateKey_file, SSL_use_PrivateKey_ASN1, SSL_use_PrivateKey,
       SSL_use_RSAPrivateKey, SSL_use_RSAPrivateKey_ASN1,
       SSL_use_RSAPrivateKey_file, SSL_CTX_check_private_key,
       SSL_check_private_key, SSL_CTX_use_cert_and_key, SSL_use_cert_and_key -
       load certificate and key data

        #include <openssl/ssl.h>

        int SSL_CTX_use_certificate(SSL_CTX *ctx, X509 *x);
        int SSL_CTX_use_certificate_ASN1(SSL_CTX *ctx, int len, unsigned char *d);
        int SSL_CTX_use_certificate_file(SSL_CTX *ctx, const char *file, int type);
        int SSL_use_certificate(SSL *ssl, X509 *x);
        int SSL_use_certificate_ASN1(SSL *ssl, unsigned char *d, int len);
        int SSL_use_certificate_file(SSL *ssl, const char *file, int type);

        int SSL_CTX_use_certificate_chain_file(SSL_CTX *ctx, const char *file);
        int SSL_use_certificate_chain_file(SSL *ssl, const char *file);

        int SSL_CTX_use_PrivateKey(SSL_CTX *ctx, EVP_PKEY *pkey);
        int SSL_CTX_use_PrivateKey_ASN1(int pk, SSL_CTX *ctx, unsigned char *d,
                                        long len);
        int SSL_CTX_use_PrivateKey_file(SSL_CTX *ctx, const char *file, int type);
        int SSL_CTX_use_RSAPrivateKey(SSL_CTX *ctx, RSA *rsa);
        int SSL_CTX_use_RSAPrivateKey_ASN1(SSL_CTX *ctx, unsigned char *d, long len);
        int SSL_CTX_use_RSAPrivateKey_file(SSL_CTX *ctx, const char *file, int type);
        int SSL_use_PrivateKey(SSL *ssl, EVP_PKEY *pkey);
        int SSL_use_PrivateKey_ASN1(int pk, SSL *ssl, unsigned char *d, long len);
        int SSL_use_PrivateKey_file(SSL *ssl, const char *file, int type);
        int SSL_use_RSAPrivateKey(SSL *ssl, RSA *rsa);
        int SSL_use_RSAPrivateKey_ASN1(SSL *ssl, unsigned char *d, long len);
        int SSL_use_RSAPrivateKey_file(SSL *ssl, const char *file, int type);

        int SSL_CTX_check_private_key(const SSL_CTX *ctx);
        int SSL_check_private_key(const SSL *ssl);

        int SSL_CTX_use_cert_and_key(SSL_CTX *ctx, X509 *x, EVP_PKEY *pkey, STACK_OF(X509) *chain, int override);
        int SSL_use_cert_and_key(SSL *ssl, X509 *x, EVP_PKEY *pkey, STACK_OF(X509) *chain, int override);

       These functions load the certificates and private keys into the SSL_CTX
       or SSL object, respectively.

       The SSL_CTX_* class of functions loads the certificates and keys into the
       SSL_CTX object ctx. The information is passed to SSL objects ssl created
       from ctx with SSL_new(3) by copying, so that changes applied to ctx do
       not propagate to already existing SSL objects.

       The SSL_* class of functions only loads certificates and keys into a
       specific SSL object. The specific information is kept, when SSL_clear(3)
       is called for this SSL object.

       SSL_CTX_use_certificate() loads the certificate x into ctx,
       SSL_use_certificate() loads x into ssl. The rest of the certificates
       needed to form the complete certificate chain can be specified using the
       SSL_CTX_add_extra_chain_cert(3) function.

       SSL_CTX_use_certificate_ASN1() loads the ASN1 encoded certificate from
       the memory location d (with length len) into ctx,
       SSL_use_certificate_ASN1() loads the ASN1 encoded certificate into ssl.

       SSL_CTX_use_certificate_file() loads the first certificate stored in file
       into ctx. The formatting type of the certificate must be specified from
       the known types SSL_FILETYPE_PEM, SSL_FILETYPE_ASN1.
       SSL_use_certificate_file() loads the certificate from file into ssl.  See
       the NOTES section on why SSL_CTX_use_certificate_chain_file() should be

       SSL_CTX_use_certificate_chain_file() loads a certificate chain from file
       into ctx. The certificates must be in PEM format and must be sorted
       starting with the subject's certificate (actual client or server
       certificate), followed by intermediate CA certificates if applicable, and
       ending at the highest level (root) CA. SSL_use_certificate_chain_file()
       is similar except it loads the certificate chain into ssl.

       SSL_CTX_use_PrivateKey() adds pkey as private key to ctx.
       SSL_CTX_use_RSAPrivateKey() adds the private key rsa of type RSA to ctx.
       SSL_use_PrivateKey() adds pkey as private key to ssl;
       SSL_use_RSAPrivateKey() adds rsa as private key of type RSA to ssl.  If a
       certificate has already been set and the private does not belong to the
       certificate an error is returned. To change a certificate, private key
       pair the new certificate needs to be set with SSL_use_certificate() or
       SSL_CTX_use_certificate() before setting the private key with
       SSL_CTX_use_PrivateKey() or SSL_use_PrivateKey().

       SSL_CTX_use_cert_and_key() and SSL_use_cert_and_key() assign the X.509
       certificate x, private key key, and certificate chain onto the
       corresponding ssl or ctx. The pkey argument must be the private key of
       the X.509 certificate x. If the override argument is 0, then x, pkey and
       chain are set only if all were not previously set.  If override is non-0,
       then the certificate, private key and chain certs are always set. If pkey
       is NULL, then the public key of x is used as the private key. This is
       intended to be used with hardware (via the ENGINE interface) that stores
       the private key securely, such that it cannot be accessed by OpenSSL. The
       reference count of the public key is incremented (twice if there is no
       private key); it is not copied nor duplicated. This allows all private
       key validations checks to succeed without an actual private key being
       assigned via SSL_CTX_use_PrivateKey(), etc.

       SSL_CTX_use_PrivateKey_ASN1() adds the private key of type pk stored at
       memory location d (length len) to ctx.  SSL_CTX_use_RSAPrivateKey_ASN1()
       adds the private key of type RSA stored at memory location d (length len)
       to ctx.  SSL_use_PrivateKey_ASN1() and SSL_use_RSAPrivateKey_ASN1() add
       the private key to ssl.

       SSL_CTX_use_PrivateKey_file() adds the first private key found in file to
       ctx. The formatting type of the private key must be specified from the
       SSL_CTX_use_RSAPrivateKey_file() adds the first private RSA key found in
       file to ctx. SSL_use_PrivateKey_file() adds the first private key found
       in file to ssl; SSL_use_RSAPrivateKey_file() adds the first private RSA
       key found to ssl.

       SSL_CTX_check_private_key() checks the consistency of a private key with
       the corresponding certificate loaded into ctx. If more than one
       key/certificate pair (RSA/DSA) is installed, the last item installed will
       be checked. If e.g. the last item was a RSA certificate or key, the RSA
       key/certificate pair will be checked. SSL_check_private_key() performs
       the same check for ssl. If no key/certificate was explicitly added for
       this ssl, the last item added into ctx will be checked.

       The internal certificate store of OpenSSL can hold several private
       key/certificate pairs at a time. The certificate used depends on the
       cipher selected, see also SSL_CTX_set_cipher_list(3).

       When reading certificates and private keys from file, files of type
       SSL_FILETYPE_ASN1 (also known as DER, binary encoding) can only contain
       one certificate or private key, consequently
       SSL_CTX_use_certificate_chain_file() is only applicable to PEM
       formatting.  Files of type SSL_FILETYPE_PEM can contain more than one

       SSL_CTX_use_certificate_chain_file() adds the first certificate found in
       the file to the certificate store. The other certificates are added to
       the store of chain certificates using SSL_CTX_add1_chain_cert(3). Note:
       versions of OpenSSL before 1.0.2 only had a single certificate chain
       store for all certificate types, OpenSSL 1.0.2 and later have a separate
       chain store for each type. SSL_CTX_use_certificate_chain_file() should be
       used instead of the SSL_CTX_use_certificate_file() function in order to
       allow the use of complete certificate chains even when no trusted CA
       storage is used or when the CA issuing the certificate shall not be added
       to the trusted CA storage.

       If additional certificates are needed to complete the chain during the
       TLS negotiation, CA certificates are additionally looked up in the
       locations of trusted CA certificates, see

       The private keys loaded from file can be encrypted. In order to
       successfully load encrypted keys, a function returning the passphrase
       must have been supplied, see SSL_CTX_set_default_passwd_cb(3).
       (Certificate files might be encrypted as well from the technical point of
       view, it however does not make sense as the data in the certificate is
       considered public anyway.)

       All of the functions to set a new certificate will replace any existing
       certificate of the same type that has already been set. Similarly all of
       the functions to set a new private key will replace any private key that
       has already been set. Applications should call
       SSL_CTX_check_private_key(3) or SSL_check_private_key(3) as appropriate
       after loading a new certificate and private key to confirm that the
       certificate and key match.

       On success, the functions return 1.  Otherwise check out the error stack
       to find out the reason.

       ssl(7), SSL_new(3), SSL_clear(3), SSL_CTX_load_verify_locations(3),
       SSL_CTX_set_default_passwd_cb(3), SSL_CTX_set_cipher_list(3),
       SSL_CTX_set_client_CA_list(3), SSL_CTX_set_client_cert_cb(3),

       Copyright 2000-2018 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

3.0.0-alpha12                      2021-02-18         SSL_CTX_USE_CERTIFICATE(3)