+extern const br_ec_impl br_ec_p256_m15;
+
+/**
+ * \brief EC implementation "i15" (generic code) for Curve25519.
+ *
+ * This implementation uses the generic code for modular integers (with
+ * 15-bit words) to support Curve25519. The `muladd()` method is not
+ * implemented.
+ */
+extern const br_ec_impl br_ec_c25519_i15;