started working on things

.gitmodules

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+[submodule "rln"]
+	path = lib/rln
+	url = https://github.com/kilic/rln

Makefile

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+.PHONY: rlnlib
+rlnlib:
+	cd lib/rln && cargo build --release
+	cp lib/rln/target/release/librln.* lib/

lib/librln.h

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+#include <cstdarg>
+#include <cstdint>
+#include <cstdlib>
+#include <ostream>
+#include <new>
+
+template<typename E = void>
+struct RLN;
+
+/// 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 {
+  const uint8_t *ptr;
+  uintptr_t len;
+};
+
+extern "C" {
+
+bool new_circuit_from_params(uintptr_t merkle_depth,
+                             const Buffer *parameters_buffer,
+                             RLN<Bn256> **ctx);
+
+bool generate_proof(const RLN<Bn256> *ctx, const Buffer *input_buffer, Buffer *output_buffer);
+
+bool verify(const RLN<Bn256> *ctx,
+            const Buffer *proof_buffer,
+            const Buffer *public_inputs_buffer,
+            uint32_t *result_ptr);
+
+bool hash(const RLN<Bn256> *ctx,
+          const Buffer *inputs_buffer,
+          const uintptr_t *input_len,
+          Buffer *output_buffer);
+
+bool key_gen(const RLN<Bn256> *ctx, Buffer *keypair_buffer);
+
+} // extern "C"

rln.go

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