Add android module with sha256 string extension

.gitignore

@@ -1,44 +1,36 @@
-# OS X
+# Built application files
+android/**/*.apk
+android/**/*.ap_
+
+# Files for the Dalvik VM
+android/**/*.dex
+
+# Java class files
+android/**/*.class
+android/**/bcprov*.jar
+
+# Generated files
+android/**/bin/
+android/**/gen/
+android/**/jniLibs/
 .DS_Store
-.AppleDouble
-.LSOverride
-Icon
-._*
-.Spotlight-V100
-.Trashes
 
-# Xcode
-*.pbxuser
-!default.pbxuser
-*.mode1v3
-!default.mode1v3
-*.mode2v3
-!default.mode2v3
-*.perspectivev3
-!default.perspectivev3
-xcuserdata
-*.xccheckout
-*.moved-aside
-DerivedData
-*.hmap
-*.ipa
-*.xcuserstate
-*.xcscmblueprint
-*.gcno
-*.gcda
+# Gradle files
+android/**/.gradle/
+android/**/build/
+android/**/captures
 
-# Carthage
-/Carthage/Checkouts
-Carthage/Build/Mac
-Carthage/Build/tvOS
-Carthage/Build/watchOS
-Carthage/Build/.*.version
+# Local configuration file (sdk path, etc)
+android/**/local.properties
 
-# AppCode
-/.idea
+# Log Files
+android/**/*.log
 
-# Ruby/Node
-vendor/bundle
-.bundle/
-node_modules/
-*.xcbkptlist
+# IDE Files
+.idea/
+android/**/.idea/
+android/**/*.iml
+android/**/.gradle
+android/**/.project
+android/**/.settings
+android/**/.classpath

Makefile

@@ -1,6 +1,6 @@
 format:
 	ios/Pods/SwiftFormat/CommandLineTool/swiftformat ios/Source --header "Copyright (c) 2017-{year} Coinbase Inc. See LICENSE"
-	# android/gradlew ktlintFormat -p android
+	android/gradlew ktlintFormat -p android
 
 lint:
 	Pods/SwiftLint/swiftlint

android/build.gradle

@@ -0,0 +1,28 @@
+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+
+buildscript {
+    apply from: rootProject.file('gradle/dependencies.gradle')
+
+    repositories {
+        google()
+        jcenter()
+    }
+
+    dependencies {
+        classpath "com.android.tools.build:gradle:${versions.gradle}"
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:${versions.kotlin}"
+        // NOTE: Do not place your application dependencies here; they belong
+        // in the individual module build.gradle files
+    }
+}
+
+allprojects {
+    repositories {
+        google()
+        jcenter()
+    }
+}
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}

android/crypto/.gitignore

@@ -0,0 +1 @@
+/build

android/crypto/build.gradle

@@ -0,0 +1,64 @@
+apply plugin: 'com.android.library'
+apply plugin: 'kotlin-android'
+apply from: '../gradle/dependencies.gradle'
+
+
+android {
+    compileSdkVersion 28
+    buildToolsVersion "29.0.0"
+
+
+    defaultConfig {
+        minSdkVersion 23
+        targetSdkVersion 28
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+
+    }
+
+}
+
+configurations {
+    ktlint
+}
+
+
+dependencies {
+    ktlint "com.pinterest:ktlint:${otherVersions.ktlint}"
+
+
+    implementation(
+            // kotlin
+            "org.jetbrains.kotlin:kotlin-stdlib-jdk8:${versions.kotlin}",
+    )
+
+    testImplementation(
+            "junit:junit:${testVersions.junit4}"
+
+    )
+
+    androidTestImplementation(
+            "androidx.test.ext:junit:${testVersions.androidXTestExtJUnit}",
+            "androidx.test:runner:${testVersions.androidXTestRunner}",
+            "androidx.test:core:${testVersions.androidXTestCore}"
+    )
+}
+
+
+task ktlint(type: JavaExec, group: "verification") {
+    description = "Check Kotlin code style."
+    main = "com.pinterest.ktlint.Main"
+    classpath = configurations.ktlint
+    args "src/**/*.kt"
+}
+
+check.dependsOn ktlint
+
+task ktlintFormat(type: JavaExec, group: "formatting") {
+    description = "Fix Kotlin code style deviations."
+    main = "com.pinterest.ktlint.Main"
+    classpath = configurations.ktlint
+    args "-F", "src/**/*.kt"
+}

android/crypto/src/main/AndroidManifest.xml

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

android/crypto/src/main/java/com/coinbase/wallet/crypto/extensions/ByteArray+Crypto.kt

@@ -0,0 +1,16 @@
+package com.coinbase.wallet.crypto.extensions
+
+/**
+ * Convert ByteArray to hex encoded string
+ */
+fun ByteArray.toHexString(): String {
+    val result = StringBuffer()
+    for (byt in this) {
+        val hex = Integer.toString((byt and 0xff) + 0x100, 16).substring(1)
+        result.append(hex)
+    }
+
+    return result.toString()
+}
+
+private infix fun Byte.and(value: Int) = toInt() and value

android/crypto/src/main/java/com/coinbase/wallet/crypto/extensions/String+Crypto.kt

@@ -0,0 +1,16 @@
+package com.coinbase.wallet.crypto.extensions
+
+import java.security.MessageDigest
+import java.security.NoSuchAlgorithmException
+
+/**
+ * Hash the string using sha256
+ *
+ * @throws `NoSuchAlgorithmException` when unable to sha256
+ */
+@Throws(NoSuchAlgorithmException::class)
+fun String.sha256(): String {
+    val md = MessageDigest.getInstance("SHA-256")
+    md.update(this.toByteArray())
+    return md.digest().toHexString()
+}

android/gradle.properties

@@ -0,0 +1,15 @@
+# Project-wide Gradle settings.
+# IDE (e.g. Android Studio) users:
+# Gradle settings configured through the IDE *will override*
+# any settings specified in this file.
+# For more details on how to configure your build environment visit
+# http://www.gradle.org/docs/current/userguide/build_environment.html
+# Specifies the JVM arguments used for the daemon process.
+# The setting is particularly useful for tweaking memory settings.
+org.gradle.jvmargs=-Xmx1536m
+# When configured, Gradle will run in incubating parallel mode.
+# This option should only be used with decoupled projects. More details, visit
+# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
+# org.gradle.parallel=true
+# Kotlin code style for this project: "official" or "obsolete":
+kotlin.code.style=official

android/gradle/dependencies.gradle

@@ -0,0 +1,19 @@
+ext {
+    versions = [
+            gradle   : '3.4.2',
+
+            kotlin   : "1.3.41",
+    ]
+
+    testVersions = [
+            junit4              : "4.12",
+
+            androidXTestCore    : "1.1.0",
+            androidXTestExtJUnit: "1.0.0",
+            androidXTestRunner  : "1.1.1",
+    ]
+
+    otherVersions = [
+            ktlint: "0.32.0"
+    ]
+}

android/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,6 @@
+#Wed Jul 31 06:31:22 CDT 2019
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.1.1-all.zip