diff --git a/ecdh_curve25519.py b/ecdh_curve25519.py
new file mode 100644
index 0000000..39c6395
--- /dev/null
+++ b/ecdh_curve25519.py
@@ -0,0 +1,25 @@
+import x25519
+
+basepoint = b'\x09' + b'\x00' * 31
+
+def derive_pubkey(seckey):
+	return x25519.x25519(seckey, basepoint)
+
+def ecdh(pubkey, seckey):
+	shared_secret = x25519.x25519(seckey, pubkey)
+	ored = 0
+	for i in shared_secret:
+		ored |= i
+	if ored == 0:
+		raise ValueError
+	else:
+		return shared_secret
+
+if __name__ == '__main__':
+	alice_sk = bytes.fromhex('77076d0a7318a57d3c16c17251b26645df4c2f87ebc0992ab177fba51db92c2a')
+	alice_pk = derive_pubkey(alice_sk)
+	bob_sk = bytes.fromhex('5dab087e624a8a4b79e17f8b83800ee66f3bb1292618b6fd1c2f8b27ff88e0eb')
+	bob_pk = derive_pubkey(bob_sk)
+
+	print(ecdh(alice_pk, bob_sk).hex() == '4a5d9d5ba4ce2de1728e3bf480350f25e07e21c947d19e3376f09b3c1e161742')
+	print(ecdh(bob_pk, alice_sk).hex() == '4a5d9d5ba4ce2de1728e3bf480350f25e07e21c947d19e3376f09b3c1e161742')