feat: define Go interfaces to rust lib

.gitignore

@@ -1,2 +1,3 @@
 lib/
 main
+.ccls-cache/

go.mod

@@ -0,0 +1,3 @@
+module git.batsense.net/mCaptcha/mcaptcha-pow-go
+
+go 1.21.5

mcaptcha_pow_go.go

@@ -0,0 +1,45 @@
+package "mcaptcha_pow_go"
+
+/*
+#cgo LDFLAGS: ./lib/libmcaptcha_pow_ffi.a -ldl
+#include "./mcaptcha-pow-ffi/mcaptcha_pow_ffi.h"
+#include <stdlib.h>
+*/
+import "C"
+import "fmt"
+
+type ProofOfWork struct {
+	nonce  uint64
+	result string
+}
+
+func ProveWork(salt string, phrase string, difficulty uint) ProofOfWork {
+	res := C.prove_work(C.CString(salt),
+		C.CString(phrase), C.uint(difficulty))
+
+	return ProofOfWork{
+		nonce:  uint64(res.nonce),
+		result: C.GoString(res.result),
+	}
+
+}
+
+func (v ProofOfWork) IsSufficientDifficulty(salt string, difficulty uint) bool {
+	res := C.is_sufficient_difficulty(
+		C.ulong(v.nonce),
+		C.CString(v.result),
+		C.CString(salt),
+		C.uint(difficulty))
+	return bool(res)
+
+}
+
+func (v ProofOfWork) IsValidProof(phrase string, salt string) bool {
+	res := C.is_valid_proof(
+		C.ulong(v.nonce),
+		C.CString(v.result),
+		C.CString(phrase),
+		C.CString(salt))
+	return bool(res)
+
+}