=pod

=head1 NAME

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

=head1 SYNOPSIS

 #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);

=head1 DESCRIPTION

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 B<ctx>. The information is passed to SSL objects B<ssl>

created from B<ctx> with L<SSL_new(3)> by copying, so that

changes applied to B<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

L<SSL_clear(3)> is called for this SSL object.

SSL_CTX_use_certificate() loads the certificate B<x> into B<ctx>,

SSL_use_certificate() loads B<x> into B<ssl>. The rest of the

certificates needed to form the complete certificate chain can be

specified using the

L<SSL_CTX_add_extra_chain_cert(3)>

function.

SSL_CTX_use_certificate_ASN1() loads the ASN1 encoded certificate from

the memory location B<d> (with length B<len>) into B<ctx>,

SSL_use_certificate_ASN1() loads the ASN1 encoded certificate into B<ssl>.

SSL_CTX_use_certificate_file() loads the first certificate stored in B<file>

into B<ctx>. The formatting B<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 B<file> into B<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

B<file> into B<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 B<ssl>.

SSL_CTX_use_PrivateKey() adds B<pkey> as private key to B<ctx>.

SSL_CTX_use_RSAPrivateKey() adds the private key B<rsa> of type RSA

to B<ctx>. SSL_use_PrivateKey() adds B<pkey> as private key to B<ssl>;

SSL_use_RSAPrivateKey() adds B<rsa> as private key of type RSA to B<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 B<x>, private key B<key>, and certificate B<chain> onto the

corresponding B<ssl> or B<ctx>. The B<pkey> argument must be the private

key of the X.509 certificate B<x>. If the B<override> argument is 0, then

B<x>, B<pkey> and B<chain> are set only if all were not previously set.

If B<override> is non-0, then the certificate, private key and chain certs

are always set. If B<pkey> is NULL, then the public key of B<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 B<pk>

stored at memory location B<d> (length B<len>) to B<ctx>.

SSL_CTX_use_RSAPrivateKey_ASN1() adds the private key of type RSA

stored at memory location B<d> (length B<len>) to B<ctx>.

SSL_use_PrivateKey_ASN1() and SSL_use_RSAPrivateKey_ASN1() add the private

key to B<ssl>.

SSL_CTX_use_PrivateKey_file() adds the first private key found in

B<file> to B<ctx>. The formatting B<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

B<file> to B<ctx>. SSL_use_PrivateKey_file() adds the first private key found

in B<file> to B<ssl>; SSL_use_RSAPrivateKey_file() adds the first private

RSA key found to B<ssl>.

SSL_CTX_check_private_key() checks the consistency of a private key with

the corresponding certificate loaded into B<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 B<ssl>. If no key/certificate was explicitly added for

this B<ssl>, the last item added into B<ctx> will be checked.

=head1 NOTES

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 L<SSL_CTX_set_cipher_list(3)>.

When reading certificates and private keys from file, files of type

SSL_FILETYPE_ASN1 (also known as B<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 item.

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 L<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

L<SSL_CTX_load_verify_locations(3)>.

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

L<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 L<SSL_CTX_check_private_key(3)> or

L<SSL_check_private_key(3)> as appropriate after loading a new certificate and

private key to confirm that the certificate and key match.

=head1 RETURN VALUES

On success, the functions return 1.

Otherwise check out the error stack to find out the reason.

=head1 SEE ALSO

L<ssl(7)>, L<SSL_new(3)>, L<SSL_clear(3)>,

L<SSL_CTX_load_verify_locations(3)>,

L<SSL_CTX_set_default_passwd_cb(3)>,

L<SSL_CTX_set_cipher_list(3)>,

L<SSL_CTX_set_client_CA_list(3)>,

L<SSL_CTX_set_client_cert_cb(3)>,

L<SSL_CTX_add_extra_chain_cert(3)>

=head1 COPYRIGHT

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

L<https://www.openssl.org/source/license.html>.

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