Differential D7006 Diff 23671 native/utils/aes-crypto-module.js

Changeset View

Standalone View

native/utils/aes-crypto-module.js

	// @flow			// @flow

	import { requireNativeModule } from 'expo-modules-core';			import { requireNativeModule } from 'expo-modules-core';
	import invariant from 'invariant';			import invariant from 'invariant';

	const KEY_SIZE = 32; // bytes			const KEY_SIZE = 32; // bytes
	const IV_LENGTH = 12; // bytes, IV - unique Initialization Vector (nonce)			const IV_LENGTH = 12; // bytes, IV - unique Initialization Vector (nonce)
	const TAG_LENGTH = 16; // bytes - GCM auth tag			const TAG_LENGTH = 16; // bytes - GCM auth tag

	const AESCryptoModule: {			const AESCryptoModule: {
	+generateKey: (destination: Uint8Array) => void,			+generateKey: (destination: Uint8Array) => void,
	+encrypt: (			+encrypt: (
	key: Uint8Array,			key: Uint8Array,
	data: Uint8Array,			data: Uint8Array,
	destination: Uint8Array,			destination: Uint8Array,
	) => void,			) => void,
				+decrypt: (
				key: Uint8Array,
				data: Uint8Array,
				destination: Uint8Array,
				) => void,
	} = requireNativeModule('AESCrypto');			} = requireNativeModule('AESCrypto');

	export function generateKey(): Uint8Array {			export function generateKey(): Uint8Array {
	const keyBuffer = new Uint8Array(KEY_SIZE);			const keyBuffer = new Uint8Array(KEY_SIZE);
	AESCryptoModule.generateKey(keyBuffer);			AESCryptoModule.generateKey(keyBuffer);
	return keyBuffer;			return keyBuffer;
	}			}

	export function encrypt(key: Uint8Array, data: Uint8Array): Uint8Array {			export function encrypt(key: Uint8Array, data: Uint8Array): Uint8Array {
	invariant(AESCryptoModule.encrypt, 'AESCrypto.encrypt is not implemented');			invariant(AESCryptoModule.encrypt, 'AESCrypto.encrypt is not implemented');
	const sealedDataBuffer = new Uint8Array(data.length + IV_LENGTH + TAG_LENGTH);			const sealedDataBuffer = new Uint8Array(data.length + IV_LENGTH + TAG_LENGTH);
	AESCryptoModule.encrypt(key, data, sealedDataBuffer);			AESCryptoModule.encrypt(key, data, sealedDataBuffer);
	return sealedDataBuffer;			return sealedDataBuffer;
	}			}

				export function decrypt(key: Uint8Array, data: Uint8Array): Uint8Array {
				invariant(AESCryptoModule.decrypt, 'AESCrypto.decrypt is not implemented');
				invariant(data.length >= IV_LENGTH + TAG_LENGTH, 'Invalid data length');
				const plaintextBuffer = new Uint8Array(data.length - IV_LENGTH - TAG_LENGTH);
				AESCryptoModule.decrypt(key, data, plaintextBuffer);
				return plaintextBuffer;
				}