RobRichards\XMLSecLibs\XMLSecurityKey::__construct PHP Method

    public function __construct($type, $params = null)
    {
        switch ($type) {
            case self::TRIPLEDES_CBC:
                $this->cryptParams['library'] = 'mcrypt';
                $this->cryptParams['cipher'] = MCRYPT_TRIPLEDES;
                $this->cryptParams['mode'] = MCRYPT_MODE_CBC;
                $this->cryptParams['method'] = 'http://www.w3.org/2001/04/xmlenc#tripledes-cbc';
                $this->cryptParams['keysize'] = 24;
                break;
            case self::AES128_CBC:
                $this->cryptParams['library'] = 'mcrypt';
                $this->cryptParams['cipher'] = MCRYPT_RIJNDAEL_128;
                $this->cryptParams['mode'] = MCRYPT_MODE_CBC;
                $this->cryptParams['method'] = 'http://www.w3.org/2001/04/xmlenc#aes128-cbc';
                $this->cryptParams['keysize'] = 16;
                break;
            case self::AES192_CBC:
                $this->cryptParams['library'] = 'mcrypt';
                $this->cryptParams['cipher'] = MCRYPT_RIJNDAEL_128;
                $this->cryptParams['mode'] = MCRYPT_MODE_CBC;
                $this->cryptParams['method'] = 'http://www.w3.org/2001/04/xmlenc#aes192-cbc';
                $this->cryptParams['keysize'] = 24;
                break;
            case self::AES256_CBC:
                $this->cryptParams['library'] = 'mcrypt';
                $this->cryptParams['cipher'] = MCRYPT_RIJNDAEL_128;
                $this->cryptParams['mode'] = MCRYPT_MODE_CBC;
                $this->cryptParams['method'] = 'http://www.w3.org/2001/04/xmlenc#aes256-cbc';
                $this->cryptParams['keysize'] = 32;
                break;
            case self::RSA_1_5:
                $this->cryptParams['library'] = 'openssl';
                $this->cryptParams['padding'] = OPENSSL_PKCS1_PADDING;
                $this->cryptParams['method'] = 'http://www.w3.org/2001/04/xmlenc#rsa-1_5';
                if (is_array($params) && !empty($params['type'])) {
                    if ($params['type'] == 'public' || $params['type'] == 'private') {
                        $this->cryptParams['type'] = $params['type'];
                        break;
                    }
                }
                throw new Exception('Certificate "type" (private/public) must be passed via parameters');
            case self::RSA_OAEP_MGF1P:
                $this->cryptParams['library'] = 'openssl';
                $this->cryptParams['padding'] = OPENSSL_PKCS1_OAEP_PADDING;
                $this->cryptParams['method'] = 'http://www.w3.org/2001/04/xmlenc#rsa-oaep-mgf1p';
                $this->cryptParams['hash'] = null;
                if (is_array($params) && !empty($params['type'])) {
                    if ($params['type'] == 'public' || $params['type'] == 'private') {
                        $this->cryptParams['type'] = $params['type'];
                        break;
                    }
                }
                throw new Exception('Certificate "type" (private/public) must be passed via parameters');
            case self::RSA_SHA1:
                $this->cryptParams['library'] = 'openssl';
                $this->cryptParams['method'] = 'http://www.w3.org/2000/09/xmldsig#rsa-sha1';
                $this->cryptParams['padding'] = OPENSSL_PKCS1_PADDING;
                if (is_array($params) && !empty($params['type'])) {
                    if ($params['type'] == 'public' || $params['type'] == 'private') {
                        $this->cryptParams['type'] = $params['type'];
                        break;
                    }
                }
                throw new Exception('Certificate "type" (private/public) must be passed via parameters');
            case self::RSA_SHA256:
                $this->cryptParams['library'] = 'openssl';
                $this->cryptParams['method'] = 'http://www.w3.org/2001/04/xmldsig-more#rsa-sha256';
                $this->cryptParams['padding'] = OPENSSL_PKCS1_PADDING;
                $this->cryptParams['digest'] = 'SHA256';
                if (is_array($params) && !empty($params['type'])) {
                    if ($params['type'] == 'public' || $params['type'] == 'private') {
                        $this->cryptParams['type'] = $params['type'];
                        break;
                    }
                }
                throw new Exception('Certificate "type" (private/public) must be passed via parameters');
            case self::RSA_SHA384:
                $this->cryptParams['library'] = 'openssl';
                $this->cryptParams['method'] = 'http://www.w3.org/2001/04/xmldsig-more#rsa-sha384';
                $this->cryptParams['padding'] = OPENSSL_PKCS1_PADDING;
                $this->cryptParams['digest'] = 'SHA384';
                if (is_array($params) && !empty($params['type'])) {
                    if ($params['type'] == 'public' || $params['type'] == 'private') {
                        $this->cryptParams['type'] = $params['type'];
                        break;
                    }
                }
                throw new Exception('Certificate "type" (private/public) must be passed via parameters');
            case self::RSA_SHA512:
                $this->cryptParams['library'] = 'openssl';
                $this->cryptParams['method'] = 'http://www.w3.org/2001/04/xmldsig-more#rsa-sha512';
                $this->cryptParams['padding'] = OPENSSL_PKCS1_PADDING;
                $this->cryptParams['digest'] = 'SHA512';
                if (is_array($params) && !empty($params['type'])) {
                    if ($params['type'] == 'public' || $params['type'] == 'private') {
                        $this->cryptParams['type'] = $params['type'];
                        break;
                    }
                }
                throw new Exception('Certificate "type" (private/public) must be passed via parameters');
            case self::HMAC_SHA1:
                $this->cryptParams['library'] = $type;
                $this->cryptParams['method'] = 'http://www.w3.org/2000/09/xmldsig#hmac-sha1';
                break;
            default:
                throw new Exception('Invalid Key Type');
        }
        $this->type = $type;
    }