added cbindgen

Makefile

@@ -1,6 +1,8 @@
 .PHONY: rlnlib
+
 rlnlib:
 	cd lib/rln && cargo build --release
-	cp lib/rln/target/release/librln.* lib/
+	cbindgen --config ../cbindgen.toml --crate rln --output librln.h --lang c
+	mv lib/rln/target/release/librln.* lib/
 
 # @TODO TARGET FOR BINDINGS.

lib/librln.h

@@ -1,37 +1,35 @@
-#include <cstdarg>
-#include <cstdint>
-#include <cstdlib>
-#include <ostream>
-#include <new>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdlib.h>
 
-template<typename E = void>
-struct RLN;
+typedef struct RLN_Bn256 RLN_Bn256;
 
-/// Buffer struct is taken from
-/// https://github.com/celo-org/celo-threshold-bls-rs/blob/master/crates/threshold-bls-ffi/src/ffi.rs
-struct Buffer {
+/**
+ * Buffer struct is taken from
+ * https://github.com/celo-org/celo-threshold-bls-rs/blob/master/crates/threshold-bls-ffi/src/ffi.rs
+ */
+typedef struct Buffer {
   const uint8_t *ptr;
   uintptr_t len;
-};
-
-extern "C" {
+} Buffer;
 
 bool new_circuit_from_params(uintptr_t merkle_depth,
-                             const Buffer *parameters_buffer,
-                             RLN<Bn256> **ctx);
+                             const struct Buffer *parameters_buffer,
+                             struct RLN_Bn256 **ctx);
 
-bool generate_proof(const RLN<Bn256> *ctx, const Buffer *input_buffer, Buffer *output_buffer);
+bool generate_proof(const struct RLN_Bn256 *ctx,
+                    const struct Buffer *input_buffer,
+                    struct Buffer *output_buffer);
 
-bool verify(const RLN<Bn256> *ctx,
-            const Buffer *proof_buffer,
-            const Buffer *public_inputs_buffer,
+bool verify(const struct RLN_Bn256 *ctx,
+            const struct Buffer *proof_buffer,
+            const struct Buffer *public_inputs_buffer,
             uint32_t *result_ptr);
 
-bool hash(const RLN<Bn256> *ctx,
-          const Buffer *inputs_buffer,
+bool hash(const struct RLN_Bn256 *ctx,
+          const struct Buffer *inputs_buffer,
           const uintptr_t *input_len,
-          Buffer *output_buffer);
+          struct Buffer *output_buffer);
 
-bool key_gen(const RLN<Bn256> *ctx, Buffer *keypair_buffer);
-
-} // extern "C"
+bool key_gen(const struct RLN_Bn256 *ctx, struct Buffer *keypair_buffer);

rln.go

@@ -1,12 +1,11 @@
 package main
 
 /*
-//#cgo CFLAGS: -I../lib
-#cgo LDFLAGS: -L./lib -llibrnl
+#cgo CFLAGS: -I../lib
 #include "./lib/librln.h"
 */
 import "C"
 
 func main() {
-	C.verify()
+	//C
 }