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       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 preferred.

       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 known types SSL_FILETYPE_PEM, SSL_FILETYPE_ASN1.
       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 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

1.1.1h				  2020-09-22	    SSL_CTX_USE_CERTIFICATE(3)


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