Differential D7005 Diff 23854 native/utils/aes-crypto-module.js

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	// @flow			// @flow

	import { requireNativeModule } from 'expo-modules-core';			import { requireNativeModule } from 'expo-modules-core';
				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 TAG_LENGTH = 16; // bytes - GCM auth tag

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