Add the go bindings for the chiavdf c wrapper

.github/workflows/lint.yaml

@@ -12,5 +12,15 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      - name: Get latest chiavdf libs
+        run: |
+          apt-get update && apt-get install -y unzip
+          LATEST_CHIAVDF=$(curl -s https://latest.cmm.io/chiavdf)
+          mkdir chiavdfc
+          cd chiavdfc || exit 1
+          wget https://github.com/Chia-Network/chiavdf/releases/download/$LATEST_CHIAVDF/chiavdfc-ubuntu-intel.zip
+          unzip chiavdfc-ubuntu-intel.zip
+          echo "CGO_CFLAGS=-I${GITHUB_WORKSPACE}/chiavdfc/chiavdfc-ubuntu-intel" >> "$GITHUB_ENV"
+
       - name: Test
         run: make test

.repo-content-updater.yml

@@ -0,0 +1,2 @@
+var_overrides:
+  CGO_ENABLED: "1"

Makefile

@@ -24,7 +24,7 @@ all: fmt lint vet build
 
 .PHONY: build
 build: $(BIN) ; $(info $(M) building executable…) @ ## Build program binary
-	$Q CGO_ENABLED=0 $(GO) build \
+	$Q CGO_ENABLED=1 $(GO) build \
 		-tags release \
 		-o $(BIN)/$(notdir $(basename $(MODULE)))$(binext) main.go
 # Tools

pkg/rpc/shared.go

@@ -5,7 +5,7 @@ import (
 )
 
 // GetNetworkInfoOptions options for the get_network_info rpc calls
-type GetNetworkInfoOptions struct {}
+type GetNetworkInfoOptions struct{}
 
 // GetNetworkInfoResponse common get_network_info response from all RPC services
 type GetNetworkInfoResponse struct {

pkg/vdf/.gitignore

@@ -0,0 +1,2 @@
+*.py
+venv

pkg/vdf/readme.md

@@ -0,0 +1,20 @@
+# Go Bindings for chiavdf
+
+This module depends on cgo and c bindings from chiavdf. To compile, you will need to provide paths to the libraries to
+link against.
+
+This example links gmp statically so the destination system doesn't need to have it installed:
+
+```shell
+# This path needs to include the c_wrapper.h file from chiavdf's c_bindings
+export CGO_CFLAGS="-I/path/to/chiavdf/src/c_bindings"
+export CGO_LDFLAGS="-L/path/to/chiavdf/build/lib/static -L/opt/homebrew/opt/gmp/lib /opt/homebrew/opt/gmp/lib/libgmp.a"
+```
+
+You can also dynamically link against gmp if the target system has it installed and available at runtime
+
+```shell
+# This path needs to include the c_wrapper.h file from chiavdf's c_bindings
+export CGO_CFLAGS="-I/path/to/chiavdf/src/c_bindings"
+export CGO_LDFLAGS="-L/path/to/chiavdf/build/lib/static -L/opt/homebrew/opt/gmp/lib -lgmp"
+```

pkg/vdf/vdf.go

@@ -0,0 +1,60 @@
+package vdf
+
+/*
+#cgo CXXFLAGS: -std=c++17
+#cgo LDFLAGS: -lstdc++ -lchiavdfc
+#include "c_wrapper.h"
+#include <stdlib.h>
+*/
+import "C"
+import (
+	"unsafe"
+)
+
+// CreateDiscriminant Creates discriminant
+func CreateDiscriminant(seed []byte, length int) string {
+	cSeed := C.CBytes(seed)
+	defer C.free(cSeed)
+
+	cResultStr := C.create_discriminant_wrapper((*C.uint8_t)(cSeed), C.size_t(len(seed)), C.int(length))
+	defer C.free(unsafe.Pointer(cResultStr))
+
+	// Convert the C-string to a Go string
+	resultStr := C.GoString(cResultStr)
+
+	return resultStr
+}
+
+// Prove generates a proof
+func Prove(challengeHash []byte, initialEL []byte, discriminantSizeBits int, numIterations uint64) []byte {
+	cChallengeHash := C.CBytes(challengeHash)
+	defer C.free(cChallengeHash)
+
+	cInitialEL := C.CBytes(initialEL)
+	defer C.free(cInitialEL)
+
+	cResult := C.prove_wrapper((*C.uint8_t)(cChallengeHash), C.size_t(len(challengeHash)), (*C.uint8_t)(cInitialEL), C.size_t(len(initialEL)), C.int(discriminantSizeBits), C.uint64_t(numIterations))
+	defer C.free(unsafe.Pointer(cResult.data))
+
+	// Convert C.ByteArray to Go []byte
+	length := int(cResult.length)
+	resultSlice := C.GoBytes(unsafe.Pointer(cResult.data), C.int(length))
+
+	return resultSlice
+}
+
+// VerifyNWesolowski checks an N Wesolowski proof.
+func VerifyNWesolowski(discriminant string, xS, proofBlob []byte, numIterations, discSizeBits, recursion uint64) bool {
+	cDiscriminant := C.CString(discriminant)
+	defer C.free(unsafe.Pointer(cDiscriminant))
+
+	cXS := C.CBytes(xS)
+	defer C.free(cXS)
+
+	cProofBlob := C.CBytes(proofBlob)
+	defer C.free(cProofBlob)
+
+	result := C.verify_n_wesolowski_wrapper((*C.char)(cDiscriminant), C.size_t(len(discriminant)), (*C.char)(cXS), C.size_t(len(xS)), (*C.char)(cProofBlob), C.size_t(len(proofBlob)), C.uint64_t(numIterations), C.uint64_t(discSizeBits), C.uint64_t(recursion))
+
+	return result == 1
+}