    function setCertificate($certificateFile, $keyFile, $keyPhrase = '')
    {
        // Check the files all exist
        if (is_file($certificateFile)) {
            $this->_certFile = $certificateFile;
        } else {
            throw new ClientException('Could not open certificate: ' . $certificateFile);
        }

        if (is_file($keyFile)) {
            $this->_keyFile = $keyFile;
        } else {
            throw new ClientException('Could not open private key: ' . $keyFile);
        }

        $this->_passphrase = (string)$keyPhrase;
    }
The software constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component.