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Title "SSL_CTX_use_certificate 3"
The SSL_CTX_* class of functions loads the certificates and keys into the \s-1SSL_CTX\s0 object ctx. The information is passed to \s-1SSL\s0 objects ssl created from ctx with SSL_new(3) by copying, so that changes applied to ctx do not propagate to already existing \s-1SSL\s0 objects.
The SSL_* class of functions only loads certificates and keys into a specific \s-1SSL\s0 object. The specific information is kept, when SSL_clear(3) is called for this \s-1SSL\s0 object.
\fISSL_CTX_use_certificate() loads the certificate x into ctx, \fISSL_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.
\fISSL_CTX_use_certificate_ASN1() loads the \s-1ASN1\s0 encoded certificate from the memory location d (with length len) into ctx, \fISSL_use_certificate_ASN1() loads the \s-1ASN1\s0 encoded certificate into ssl.
\fISSL_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 \s-1SSL_FILETYPE_PEM\s0, \s-1SSL_FILETYPE_ASN1\s0. \fISSL_use_certificate_file() loads the certificate from file into ssl. See the \s-1NOTES\s0 section on why SSL_CTX_use_certificate_chain_file() should be preferred.
\fISSL_CTX_use_certificate_chain_file() loads a certificate chain from \fBfile into ctx. The certificates must be in \s-1PEM\s0 format and must be sorted starting with the certificate to the highest level (root \s-1CA\s0). There is no corresponding function working on a single \s-1SSL\s0 object.
\fISSL_CTX_use_PrivateKey() adds pkey as private key to ctx. \fISSL_CTX_use_RSAPrivateKey() adds the private key rsa of type \s-1RSA\s0 to ctx. SSL_use_PrivateKey() adds pkey as private key to ssl; \fISSL_use_RSAPrivateKey() adds rsa as private key of type \s-1RSA\s0 to ssl.
\fISSL_CTX_use_PrivateKey_ASN1() adds the private key of type pk stored at memory location d (length len) to ctx. \fISSL_CTX_use_RSAPrivateKey_ASN1() adds the private key of type \s-1RSA\s0 stored at memory location d (length len) to ctx. \fISSL_use_PrivateKey_ASN1() and SSL_use_RSAPrivateKey_ASN1() add the private key to ssl.
\fISSL_CTX_use_PrivateKey_file() adds the first private key found in \fBfile to ctx. The formatting type 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() adds the first private \s-1RSA\s0 key found in \fBfile to ctx. SSL_use_PrivateKey_file() adds the first private key found in file to ssl; SSL_use_RSAPrivateKey_file() adds the first private \s-1RSA\s0 key found to ssl.
\fISSL_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 (\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. 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.
When reading certificates and private keys from file, files of type \s-1SSL_FILETYPE_ASN1\s0 (also known as \s-1DER\s0, binary encoding) can only contain one certificate or private key, consequently \fISSL_CTX_use_certificate_chain_file() is only applicable to \s-1PEM\s0 formatting. Files of type \s-1SSL_FILETYPE_PEM\s0 can contain more than one item.
\fISSL_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_add_extra_chain_cert(3). There exists only one extra chain store, so that the same chain is appended to both types of certificates, \s-1RSA\s0 and \s-1DSA\s0! If it is not intended to use both type of certificate at the same time, it is recommended to use the \fISSL_CTX_use_certificate_chain_file() instead of the \fISSL_CTX_use_certificate_file() 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.
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 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 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.)