Define new Diffie-Hellman context for mbedTLS
diff --git a/src/mbedtls.h b/src/mbedtls.h
index 248583e..2b6ce5f 100644
--- a/src/mbedtls.h
+++ b/src/mbedtls.h
@@ -259,6 +259,14 @@
 
 /*******************************************************************/
 /*
+ * mbedTLS backend: Diffie-Hellman support.
+ */
+
+#define _libssh2_dh_ctx _libssh2_bn *
+
+
+/*******************************************************************/
+/*
  * mbedTLS backend: forward declarations
  */
 void