diff --git a/src/tls/openssl/tls.h b/src/tls/openssl/tls.h
new file mode 100644
index 0000000..2c621d5
--- /dev/null
+++ b/src/tls/openssl/tls.h
@@ -0,0 +1,35 @@
+/**
+ * @file openssl/tls.h TLS backend using OpenSSL (Internal API)
+ *
+ * Copyright (C) 2010 Creytiv.com
+ */
+
+
+/*
+ * Mapping of feature macros
+ */
+
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
+#define TLS_BIO_OPAQUE 1
+#endif
+
+#if defined (LIBRESSL_VERSION_NUMBER)
+#undef  TLS_BIO_OPAQUE
+#endif
+
+
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L && \
+	!defined(LIBRESSL_VERSION_NUMBER)
+#define SSL_state SSL_get_state
+#define SSL_ST_OK TLS_ST_OK
+#endif
+
+
+struct tls {
+	SSL_CTX *ctx;
+	X509 *cert;
+	char *pass;  /* password for private key */
+};
+
+
+void tls_flush_error(void);