Updated Android implementation and usage example.

README.md

@@ -15,8 +15,8 @@ import {calculateWitness} from 'react-native-circom-witnesscalc';
 
 // ...
 
-const inputs = readFileFromFS('path/to/inputs.json').encode('base64');
-const graph = readFileFromFS('path/to/graph.wcd').encode('base64');
+const inputs = RNFS.readFile('path/to/inputs.json', 'utf8');
+const graph = RNFS.readFile('path/to/graph.wcd', "base64");
 
 const result = await calculateWitness(inputs, graph);
 

android/build.gradle

@@ -16,7 +16,7 @@ buildscript {
 
 def reactNativeArchitectures() {
   def value = rootProject.getProperties().get("reactNativeArchitectures")
-  return value ? value.split(",") : ["armeabi-v7a", "x86", "x86_64", "arm64-v8a"]
+  return value ? value.split(",") : ["x86_64", "arm64-v8a"]
 }
 
 def isNewArchitectureEnabled() {
@@ -49,7 +49,7 @@ def supportsNamespace() {
 
 android {
   if (supportsNamespace()) {
-    namespace "com.circomwitnesscalc"
+    namespace "io.iden3.rn_circom_witnesscalc"
 
     sourceSets {
       main {
@@ -58,14 +58,23 @@ android {
     }
   }
 
+  ndkVersion getExtOrDefault("ndkVersion")
   compileSdkVersion getExtOrIntegerDefault("compileSdkVersion")
 
   defaultConfig {
     minSdkVersion getExtOrIntegerDefault("minSdkVersion")
     targetSdkVersion getExtOrIntegerDefault("targetSdkVersion")
-
+    buildConfigField "boolean", "IS_NEW_ARCHITECTURE_ENABLED", isNewArchitectureEnabled().toString()
+    ndk {
+      abiFilters "x86_64", "arm64-v8a"
+    }
+    externalNativeBuild {
+      cmake {
+        cppFlags "-O2 -frtti -fexceptions -Wall -fstack-protector-all"
+        abiFilters "x86_64", "arm64-v8a"
+      }
+    }
   }
-
   buildTypes {
     release {
       minifyEnabled false
@@ -95,5 +104,14 @@ dependencies {
   //noinspection GradleDynamicVersion
   implementation "com.facebook.react:react-native:+"
   implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
+
+  implementation "io.iden3.circomwitnesscalc:0.0.1-alpha.1"
 }
 
+if (isNewArchitectureEnabled()) {
+  react {
+    jsRootDir = file("../src/")
+    libraryName = "CircomWitnesscalc"
+    codegenJavaPackageName = "com.circomwitnesscalc"
+  }
+}

android/src/main/java/com/circomwitnesscalc/CircomWitnesscalcModule.kt

@@ -4,6 +4,7 @@ import com.facebook.react.bridge.ReactApplicationContext
 import com.facebook.react.bridge.ReactContextBaseJavaModule
 import com.facebook.react.bridge.ReactMethod
 import com.facebook.react.bridge.Promise
+import io.iden3.circomwitnesscalc.CircomWitnesscalc
 
 class CircomWitnesscalcModule(reactContext: ReactApplicationContext) :
   ReactContextBaseJavaModule(reactContext) {
@@ -15,7 +16,24 @@ class CircomWitnesscalcModule(reactContext: ReactApplicationContext) :
   // Example method
   // See https://reactnative.dev/docs/native-modules-android
   @ReactMethod
-  fun multiply(a: Double, b: Double, promise: Promise) {
+  fun calculateWitness(inputs: String, graph: String, promise: Promise) {
+    try {
+      // Decode base64
+      byte[] zkeyBytes = Base64.decode(graph, Base64.DEFAULT);
+
+      ByteArray witness = CircomWitnesscalc.calculateWitness(
+        inputs,
+        graph
+      );
+
+      // Encode base64
+      String witnessBase64 = Base64.encodeToString(witness, Base64.DEFAULT);
+
+      promise.resolve(witnessBase64);
+    } catch (RapidsnarkError e) {
+      promise.reject(String.valueOf(e.getCode()), e.getMessage());
+    }
+
     promise.resolve(a * b)
   }