D6995.1765103333.diff
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	diff --git a/web/database/utils/worker-crypto-utils.js b/web/database/utils/worker-crypto-utils.js
	new file mode 100644
	--- /dev/null
	+++ b/web/database/utils/worker-crypto-utils.js
	@@ -0,0 +1,59 @@
	+// @flow
	+
	+const ENCRYPTION_ALGORITHM = 'AES-GCM';
	+
	+type EncryptionResult = {
	+ +iv: BufferSource,
	+ +cipher: ArrayBuffer,
	+};
	+
	+function generateDatabaseCryptoKey(): Promise<CryptoKey> {
	+ return crypto.subtle.generateKey(
	+ {
	+ name: ENCRYPTION_ALGORITHM,
	+ length: 256,
	+ },
	+ false,
	+ ['encrypt', 'decrypt'],
	+ );
	+}
	+
	+function generateIv(): BufferSource {
	+ return crypto.getRandomValues(new Uint8Array(12));
	+}
	+
	+async function encryptDatabaseFile(
	+ data: ArrayBuffer,
	+ key: CryptoKey,
	+): Promise<EncryptionResult> {
	+ const iv = generateIv();
	+ const cipher = await crypto.subtle.encrypt(
	+ {
	+ name: ENCRYPTION_ALGORITHM,
	+ iv: iv,
	+ },
	+ key,
	+ data,
	+ );
	+ return {
	+ cipher,
	+ iv,
	+ };
	+}
	+
	+async function decryptDatabaseFile(
	+ cipher: ArrayBuffer,
	+ key: CryptoKey,
	+ iv: BufferSource,
	+): Promise<ArrayBuffer> {
	+ return crypto.subtle.decrypt(
	+ {
	+ name: ENCRYPTION_ALGORITHM,
	+ iv,
	+ },
	+ key,
	+ cipher,
	+ );
	+}
	+
	+export { generateDatabaseCryptoKey, encryptDatabaseFile, decryptDatabaseFile };