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The information is passed to \s-1SSL\s0 objects \fBssl\fR created from \fBctx\fR with \fISSL_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 \&\fISSL_clear\fR\|(3) is called for this \s-1SSL\s0 object. .PP \&\fISSL_CTX_use_certificate()\fR loads the certificate \fBx\fR into \fBctx\fR, \&\fISSL_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 \&\fISSL_CTX_add_extra_chain_cert\fR\|(3) function. .PP \&\fISSL_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, \&\fISSL_use_certificate_ASN1()\fR loads the \s-1ASN1\s0 encoded certificate into \fBssl\fR. .PP \&\fISSL_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\s0, \s-1SSL_FILETYPE_ASN1\s0. \&\fISSL_use_certificate_file()\fR loads the certificate from \fBfile\fR into \fBssl\fR. See the \s-1NOTES\s0 section on why \fISSL_CTX_use_certificate_chain_file()\fR should be preferred. .PP \&\fISSL_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 \&\fISSL_CTX_use_PrivateKey()\fR adds \fBpkey\fR as private key to \fBctx\fR. \&\fISSL_CTX_use_RSAPrivateKey()\fR adds the private key \fBrsa\fR of type \s-1RSA\s0 to \fBctx\fR. \fISSL_use_PrivateKey()\fR adds \fBpkey\fR as private key to \fBssl\fR; \&\fISSL_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 \fISSL_use_certificate()\fR or \fISSL_CTX_use_certificate()\fR before setting the private key with \&\fISSL_CTX_use_PrivateKey()\fR or \fISSL_use_PrivateKey()\fR. .PP \&\fISSL_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. \&\fISSL_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. \&\fISSL_use_PrivateKey_ASN1()\fR and \fISSL_use_RSAPrivateKey_ASN1()\fR add the private key to \fBssl\fR. .PP \&\fISSL_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\s0, \s-1SSL_FILETYPE_ASN1\s0. \&\fISSL_CTX_use_RSAPrivateKey_file()\fR adds the first private \s-1RSA\s0 key found in \&\fBfile\fR to \fBctx\fR. \fISSL_use_PrivateKey_file()\fR adds the first private key found in \fBfile\fR to \fBssl\fR; \fISSL_use_RSAPrivateKey_file()\fR adds the first private \&\s-1RSA\s0 key found to \fBssl\fR. .PP \&\fISSL_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. \fISSL_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 \fISSL_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 \&\fISSL_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 \&\fISSL_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 \fISSL_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. \fISSL_CTX_use_certificate_chain_file()\fR should be used instead of the \fISSL_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 \&\fISSL_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 \&\fISSL_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.) .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" \&\fIssl\fR\|(3), \fISSL_new\fR\|(3), \fISSL_clear\fR\|(3), \&\fISSL_CTX_load_verify_locations\fR\|(3), \&\fISSL_CTX_set_default_passwd_cb\fR\|(3), \&\fISSL_CTX_set_cipher_list\fR\|(3), \&\fISSL_CTX_set_client_cert_cb\fR\|(3), \&\fISSL_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 \&\fISSL_CTX_use_PrivateKey_file()\fR and \fISSL_use_PrivateKey_file()\fR was added in 0.9.8 .