Android: Add very basic Curve25519 benchmarks

.gitignore

@@ -15,10 +15,7 @@
 \#*\#
 .\#*
 
-java/build
-java/android/build/
-java/client/build
-java/server/build
+java/**/build
 java/.gradle
 java/local.properties
 java/android/src/main/jniLibs

java/android/benchmarks/build.gradle

@@ -0,0 +1,38 @@
+plugins {
+    id 'com.android.library' version '7.0.0'
+    id 'androidx.benchmark' version '1.1.1'
+}
+
+repositories {
+    google()
+    mavenCentral()
+    mavenLocal()
+}
+
+android {
+    compileSdkVersion 31
+
+    defaultConfig {
+        minSdkVersion 19
+        targetSdkVersion 30
+        multiDexEnabled true
+    }
+
+    testBuildType "release"
+
+    compileOptions {
+        coreLibraryDesugaringEnabled true
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+
+    namespace "org.signal.libsignal.benchmarks"
+}
+
+dependencies {
+    androidTestImplementation "androidx.test:runner:1.4.0"
+    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
+    androidTestImplementation 'androidx.benchmark:benchmark-junit4:1.1.1'
+    coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:1.1.6'
+    androidTestImplementation project(':android')
+}

java/android/benchmarks/src/androidTest/AndroidManifest.xml

@@ -0,0 +1,4 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <application
+        android:debuggable="false"/>
+</manifest>

java/android/benchmarks/src/androidTest/java/ECCBenchmark.java

@@ -0,0 +1,43 @@
+/**
+ * Copyright (C) 2022 Open Whisper Systems
+ *
+ * Licensed according to the LICENSE file in this repository.
+ */
+
+import org.signal.libsignal.protocol.ecc.*;
+
+import androidx.benchmark.BenchmarkState;
+import androidx.benchmark.junit4.BenchmarkRule;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+@RunWith(AndroidJUnit4.class)
+public class ECCBenchmark {
+    @Rule
+    public final BenchmarkRule benchmarkRule = new BenchmarkRule();
+
+    private final ECKeyPair alicePair = Curve.generateKeyPair();
+    private final ECKeyPair bobPair = Curve.generateKeyPair();
+    private final byte[] arbitraryData = new byte[] { 0x53, 0x69, 0x67, 0x6E, 0x61, 0x6C };
+
+    @Test
+    public void benchmarkKeyAgreement() {
+        final BenchmarkState state = benchmarkRule.getState();
+
+        while (state.keepRunning()) {
+            alicePair.getPrivateKey().calculateAgreement(bobPair.getPublicKey());
+        }
+    }
+
+    @Test
+    public void benchmarkSignature() {
+        final BenchmarkState state = benchmarkRule.getState();
+
+        while (state.keepRunning()) {
+            final byte[] signature = alicePair.getPrivateKey().calculateSignature(arbitraryData);
+            alicePair.getPublicKey().verifySignature(arbitraryData, signature);
+        }
+    }
+}

java/android/benchmarks/src/main/AndroidManifest.xml

@@ -0,0 +1,2 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+</manifest>

java/gradle.properties

@@ -1 +1,2 @@
+android.enableAdditionalTestOutput=true
 android.useAndroidX=true

java/settings.gradle

@@ -9,7 +9,7 @@ pluginManagement {
 include ':client', ':server'
 
 if (JavaVersion.current().isJava11Compatible()) {
-    include ':android'
+    include ':android', ':android:benchmarks'
 } else if (gradle.startParameter.getTaskNames().any { name -> name.contains('android:') }) {
     throw new GradleException("building for Android requires JDK 11 or newer")
 } else if (gradle.startParameter.getTaskNames().any { name -> name.lastIndexOf(':') <= 0 }) {