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.\" ========================================================================
.\"
.IX Title "SSL_CTX_use_certificate 3"
.TH SSL_CTX_use_certificate 3 "2019-12-20" "1.0.2u" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "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_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 \- load certificate and key data
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #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_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);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
These functions load the certificates and private keys into the \s-1SSL_CTX\s0
or \s-1SSL\s0 object, respectively.
.PP
The SSL_CTX_* class of functions loads the certificates and keys into the
\&\s-1SSL_CTX\s0 object \fBctx\fR. The information is passed to \s-1SSL\s0 objects \fBssl\fR
created from \fBctx\fR with \fBSSL_new\fR\|(3) by copying, so that
changes applied to \fBctx\fR do not propagate to already existing \s-1SSL\s0 objects.
.PP
The SSL_* class of functions only loads certificates and keys into a
specific \s-1SSL\s0 object. The specific information is kept, when
\&\fBSSL_clear\fR\|(3) is called for this \s-1SSL\s0 object.
.PP
\&\fBSSL_CTX_use_certificate()\fR loads the certificate \fBx\fR into \fBctx\fR,
\&\fBSSL_use_certificate()\fR loads \fBx\fR into \fBssl\fR. The rest of the
certificates needed to form the complete certificate chain can be
specified using the
\&\fBSSL_CTX_add_extra_chain_cert\fR\|(3)
function.
.PP
\&\fBSSL_CTX_use_certificate_ASN1()\fR loads the \s-1ASN1\s0 encoded certificate from
the memory location \fBd\fR (with length \fBlen\fR) into \fBctx\fR,
\&\fBSSL_use_certificate_ASN1()\fR loads the \s-1ASN1\s0 encoded certificate into \fBssl\fR.
.PP
\&\fBSSL_CTX_use_certificate_file()\fR loads the first certificate stored in \fBfile\fR
into \fBctx\fR. The formatting \fBtype\fR of the certificate must be specified
from the known types \s-1SSL_FILETYPE_PEM, SSL_FILETYPE_ASN1.\s0
\&\fBSSL_use_certificate_file()\fR loads the certificate from \fBfile\fR into \fBssl\fR.
See the \s-1NOTES\s0 section on why \fBSSL_CTX_use_certificate_chain_file()\fR
should be preferred.
.PP
\&\fBSSL_CTX_use_certificate_chain_file()\fR loads a certificate chain from 
\&\fBfile\fR into \fBctx\fR. The certificates must be in \s-1PEM\s0 format and must
be sorted starting with the subject's certificate (actual client or server
certificate), followed by intermediate \s-1CA\s0 certificates if applicable, and
ending at the highest level (root) \s-1CA.\s0
There is no corresponding function working on a single \s-1SSL\s0 object.
.PP
\&\fBSSL_CTX_use_PrivateKey()\fR adds \fBpkey\fR as private key to \fBctx\fR.
\&\fBSSL_CTX_use_RSAPrivateKey()\fR adds the private key \fBrsa\fR of type \s-1RSA\s0
to \fBctx\fR. \fBSSL_use_PrivateKey()\fR adds \fBpkey\fR as private key to \fBssl\fR;
\&\fBSSL_use_RSAPrivateKey()\fR adds \fBrsa\fR as private key of type \s-1RSA\s0 to \fBssl\fR.
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 \fBSSL_use_certificate()\fR
or \fBSSL_CTX_use_certificate()\fR before setting the private key with
\&\fBSSL_CTX_use_PrivateKey()\fR or \fBSSL_use_PrivateKey()\fR.
.PP
\&\fBSSL_CTX_use_PrivateKey_ASN1()\fR adds the private key of type \fBpk\fR
stored at memory location \fBd\fR (length \fBlen\fR) to \fBctx\fR.
\&\fBSSL_CTX_use_RSAPrivateKey_ASN1()\fR adds the private key of type \s-1RSA\s0
stored at memory location \fBd\fR (length \fBlen\fR) to \fBctx\fR.
\&\fBSSL_use_PrivateKey_ASN1()\fR and \fBSSL_use_RSAPrivateKey_ASN1()\fR add the private
key to \fBssl\fR.
.PP
\&\fBSSL_CTX_use_PrivateKey_file()\fR adds the first private key found in
\&\fBfile\fR to \fBctx\fR. The formatting \fBtype\fR of the certificate must be specified
from the known types \s-1SSL_FILETYPE_PEM, SSL_FILETYPE_ASN1.\s0
\&\fBSSL_CTX_use_RSAPrivateKey_file()\fR adds the first private \s-1RSA\s0 key found in
\&\fBfile\fR to \fBctx\fR. \fBSSL_use_PrivateKey_file()\fR adds the first private key found
in \fBfile\fR to \fBssl\fR; \fBSSL_use_RSAPrivateKey_file()\fR adds the first private
\&\s-1RSA\s0 key found to \fBssl\fR.
.PP
\&\fBSSL_CTX_check_private_key()\fR checks the consistency of a private key with
the corresponding certificate loaded into \fBctx\fR. If more than one
key/certificate pair (\s-1RSA/DSA\s0) is installed, the last item installed will
be checked. If e.g. the last item was a \s-1RSA\s0 certificate or key, the \s-1RSA\s0
key/certificate pair will be checked. \fBSSL_check_private_key()\fR performs
the same check for \fBssl\fR. If no key/certificate was explicitly added for
this \fBssl\fR, the last item added into \fBctx\fR will be checked.
.SH "NOTES"
.IX Header "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 \fBSSL_CTX_set_cipher_list\fR\|(3).
.PP
When reading certificates and private keys from file, files of type
\&\s-1SSL_FILETYPE_ASN1\s0 (also known as \fB\s-1DER\s0\fR, binary encoding) can only contain
one certificate or private key, consequently 
\&\fBSSL_CTX_use_certificate_chain_file()\fR is only applicable to \s-1PEM\s0 formatting.
Files of type \s-1SSL_FILETYPE_PEM\s0 can contain more than one item.
.PP
\&\fBSSL_CTX_use_certificate_chain_file()\fR adds the first certificate found
in the file to the certificate store. The other certificates are added
to the store of chain certificates using \fBSSL_CTX_add1_chain_cert\fR\|(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. \fBSSL_CTX_use_certificate_chain_file()\fR 
should be used instead of the \fBSSL_CTX_use_certificate_file()\fR function in order
to allow the use of complete certificate chains even when no trusted \s-1CA\s0
storage is used or when the \s-1CA\s0 issuing the certificate shall not be added to
the trusted \s-1CA\s0 storage.
.PP
If additional certificates are needed to complete the chain during the
\&\s-1TLS\s0 negotiation, \s-1CA\s0 certificates are additionally looked up in the
locations of trusted \s-1CA\s0 certificates, see
\&\fBSSL_CTX_load_verify_locations\fR\|(3).
.PP
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
\&\fBSSL_CTX_set_default_passwd_cb\fR\|(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.)
.PP
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 \fBSSL_CTX_check_private_key\fR\|(3) or
\&\fBSSL_check_private_key\fR\|(3) as appropriate after loading a new certificate and
private key to confirm that the certificate and key match.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
On success, the functions return 1.
Otherwise check out the error stack to find out the reason.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBssl\fR\|(3), \fBSSL_new\fR\|(3), \fBSSL_clear\fR\|(3),
\&\fBSSL_CTX_load_verify_locations\fR\|(3),
\&\fBSSL_CTX_set_default_passwd_cb\fR\|(3),
\&\fBSSL_CTX_set_cipher_list\fR\|(3),
\&\fBSSL_CTX_set_client_cert_cb\fR\|(3),
\&\fBSSL_CTX_add_extra_chain_cert\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
Support for \s-1DER\s0 encoded private keys (\s-1SSL_FILETYPE_ASN1\s0) in
\&\fBSSL_CTX_use_PrivateKey_file()\fR and \fBSSL_use_PrivateKey_file()\fR was added
in 0.9.8 .