* #35924 (zrtp): switch to libzrtpcpp
diff --git a/jni/libzrtp/sources/bnlib/ec/ecdh.c b/jni/libzrtp/sources/bnlib/ec/ecdh.c
new file mode 100644
index 0000000..8d1bc23
--- /dev/null
+++ b/jni/libzrtp/sources/bnlib/ec/ecdh.c
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2012 Werner Dittmann
+ * All rights reserved. For licensing and other legal details, see the file legal.c.
+ *
+ * @author Werner Dittmann <Werner.Dittmann@t-online.de>
+ *
+ */
+
+#include <ec/ec.h>
+#include <ec/ecdh.h>
+
+int ecdhGeneratePublic(const EcCurve *curve, EcPoint *Q, const BigNum *d)
+{
+ EcPoint G;
+
+ INIT_EC_POINT(&G);
+ SET_EC_BASE_POINT(curve, &G);
+
+ ecMulPointScalar(curve, Q, &G, d);
+ ecGetAffine(curve, Q, Q);
+
+ FREE_EC_POINT(&G);
+
+ return ecCheckPubKey(curve, Q);
+}
+
+int ecdhComputeAgreement(const EcCurve *curve, BigNum *agreement, const EcPoint *Q, const BigNum *d)
+{
+ EcPoint t0;
+
+ INIT_EC_POINT(&t0);
+
+ ecMulPointScalar(curve, &t0, Q, d);
+ ecGetAffine(curve, &t0, &t0);
+ /* TODO: check for infinity here */
+
+ bnCopy(agreement, t0.x);
+
+ FREE_EC_POINT(&t0);
+
+ return 0;
+}