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diff --git a/native/expo-modules/aes-crypto/android/src/main/java/app/comm/android/aescrypto/AESCryptoModule.kt b/native/expo-modules/aes-crypto/android/src/main/java/app/comm/android/aescrypto/AESCryptoModule.kt
--- a/native/expo-modules/aes-crypto/android/src/main/java/app/comm/android/aescrypto/AESCryptoModule.kt
+++ b/native/expo-modules/aes-crypto/android/src/main/java/app/comm/android/aescrypto/AESCryptoModule.kt
@@ -1,14 +1,49 @@
package app.comm.android.aescrypto
+import expo.modules.core.errors.CodedException
import expo.modules.kotlin.modules.Module
import expo.modules.kotlin.modules.ModuleDefinition
+import expo.modules.kotlin.typedarray.Uint8Array
+import java.security.SecureRandom
+import javax.crypto.KeyGenerator
+
+private const val ALGORITHM_AES = "AES"
+private const val KEY_SIZE = 32 // bytes
class AESCryptoModule : Module() {
+ private val secureRandom by lazy { SecureRandom() }
+
override fun definition() = ModuleDefinition {
Name("AESCrypto")
- Function("hello") {
- return@Function "Hello world! 👋"
+ Function("generateKey", this@AESCryptoModule::generateKey)
+ }
+
+ // region Function implementations
+
+ /**
+ * Generates AES-256 key and stores it in [destination] array
+ *
+ * @param destination JS typed array, must be [KEY_SIZE] bytes long
+ */
+ private fun generateKey(destination: Uint8Array) {
+ if (destination.byteLength != KEY_SIZE) {
+ throw InvalidKeyLengthException()
}
+
+ val keygen = KeyGenerator.getInstance(ALGORITHM_AES).apply {
+ init(KEY_SIZE * 8, secureRandom)
+ }
+ val keyBytes = keygen.generateKey().encoded
+ destination.write(keyBytes, position = 0, size = keyBytes.size)
}
+
+ // endregion
}
+
+// region Exception definitions
+
+private class InvalidKeyLengthException :
+ CodedException("The AES key has invalid length")
+
+// endregion
diff --git a/native/expo-modules/aes-crypto/ios/AESCryptoModule.swift b/native/expo-modules/aes-crypto/ios/AESCryptoModule.swift
--- a/native/expo-modules/aes-crypto/ios/AESCryptoModule.swift
+++ b/native/expo-modules/aes-crypto/ios/AESCryptoModule.swift
@@ -1,11 +1,41 @@
import ExpoModulesCore
+import CryptoKit
+
+private let KEY_SIZE = 32 // bytes
public class AESCryptoModule: Module {
public func definition() -> ModuleDefinition {
Name("AESCrypto")
- Function("hello") { () -> String in
- return "Hello world! 👋"
- }
+ Function("generateKey", generateKey)
+ }
+}
+
+// MARK: - Function implementations
+
+private func generateKey(destination: Uint8Array) throws {
+ guard destination.byteLength == KEY_SIZE else {
+ throw InvalidKeyLengthException()
+ }
+ let key = SymmetricKey(size: .bits256)
+ key.withUnsafeBytes { bytes in
+ let _ = bytes.copyBytes(to: destination.rawBufferPtr())
+ }
+}
+
+// MARK: - Utilities
+
+extension TypedArray {
+ func rawBufferPtr() -> UnsafeMutableRawBufferPointer {
+ UnsafeMutableRawBufferPointer(start: self.rawPointer,
+ count: self.byteLength)
+ }
+}
+
+// MARK: - Exception definitions
+
+private class InvalidKeyLengthException: Exception {
+ override var reason: String {
+ "The AES key has invalid length"
}
}
diff --git a/native/utils/aes-crypto-module.js b/native/utils/aes-crypto-module.js
--- a/native/utils/aes-crypto-module.js
+++ b/native/utils/aes-crypto-module.js
@@ -2,10 +2,14 @@
import { requireNativeModule } from 'expo-modules-core';
+const KEY_SIZE = 32; // bytes
+
const AESCryptoModule: {
- +hello: () => string,
+ +generateKey: (destination: Uint8Array) => void,
} = requireNativeModule('AESCrypto');
-export function hello(): string {
- return AESCryptoModule.hello();
+export function generateKey(): Uint8Array {
+ const keyBuffer = new Uint8Array(KEY_SIZE);
+ AESCryptoModule.generateKey(keyBuffer);
+ return keyBuffer;
}

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