NativeScript Polyfiils

crypto.ts

import { isAndroid } from '@nativescript/core';

class TypeMismatchError extends Error {}
class QuotaExceededError extends Error {}

/**
 * @param {Int8Array|Uint8Array|Int16Array|Uint16Array|Int32Array|Uint32Array|Uint8ClampedArray} array
 */
function getRandomValues(array) {
	if (
		!(
			array instanceof Int8Array ||
			array instanceof Uint8Array ||
			array instanceof Int16Array ||
			array instanceof Uint16Array ||
			array instanceof Int32Array ||
			array instanceof Uint32Array ||
			array instanceof Uint8ClampedArray
		)
	) {
		throw new TypeMismatchError('Expected an integer array');
	}

	if (array.byteLength > 65536) {
		throw new QuotaExceededError('Can only request a maximum of 65536 bytes');
	}

	if (isAndroid) {
		const bytes = java.nio.ByteBuffer.allocate(array.byteLength).array();
		java.security.SecureRandom.getInstanceStrong().nextBytes(bytes);
		array.set(bytes);
		return array;
	} else {
		SecRandomCopyBytes(kSecRandomDefault, array.byteLength, array as unknown as interop.Pointer);
		return array;
	}
}

if (typeof global.crypto !== 'object') {
	global.crypto = {};
}

if (typeof global.crypto.getRandomValues !== 'function') {
	global.crypto.getRandomValues = getRandomValues;
}