Differential D7004 Diff 23669 native/expo-modules/aes-crypto/ios/AESCryptoModule.swift

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Standalone View

	import ExpoModulesCore			import ExpoModulesCore
				import CryptoKit

				private let KEY_SIZE = 32 // bytes

	public class AESCryptoModule: Module {			public class AESCryptoModule: Module {
	public func definition() -> ModuleDefinition {			public func definition() -> ModuleDefinition {
	Name("AESCrypto")			Name("AESCrypto")

	Function("hello") { () -> String in			Function("generateKey", generateKey)
	return "Hello world! 👋"			}
				}

				// 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"
	}			}
	}			}