Differential D7004 Diff 23853 native/expo-modules/aes-crypto/android/src/main/java/app/comm/android/aescrypto/AESCryptoModule.kt

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	package app.comm.android.aescrypto			package app.comm.android.aescrypto

				import expo.modules.core.errors.CodedException
	import expo.modules.kotlin.modules.Module			import expo.modules.kotlin.modules.Module
	import expo.modules.kotlin.modules.ModuleDefinition			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() {			class AESCryptoModule : Module() {
				private val secureRandom by lazy { SecureRandom() }

	override fun definition() = ModuleDefinition {			override fun definition() = ModuleDefinition {
	Name("AESCrypto")			Name("AESCrypto")

	Function("hello") {			Function("generateKey", this@AESCryptoModule::generateKey)
	return@Function "Hello world! 👋"			}

				// 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