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Minor refactor

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This commit is contained in:
Vishnu Mohandas 2020-09-26 03:08:14 +05:30
parent d6e0671fe7
commit 05a67773e9
1 changed files with 15 additions and 15 deletions
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30
lib/utils/crypto_util.dart
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@ -18,9 +18,9 @@ import 'package:uuid/uuid.dart';
class CryptoUtil {
static Logger _logger = Logger("CryptoUtil");
static int encryptionBlockSize = 4 * 1024 * 1024;
static int decryptionBlockSize =
encryptionBlockSize + Sodium.cryptoSecretstreamXchacha20poly1305Abytes;
static int encryptionChunkSize = 4 * 1024 * 1024;
static int decryptionChunkSize =
encryptionChunkSize + Sodium.cryptoSecretstreamXchacha20poly1305Abytes;
static Future<EncryptedData> encrypt(Uint8List source,
{Uint8List key}) async {
@ -71,15 +71,15 @@ class CryptoUtil {
var bytesRead = 0;
var tag = Sodium.cryptoSecretstreamXchacha20poly1305TagMessage;
while (tag != Sodium.cryptoSecretstreamXchacha20poly1305TagFinal) {
var blockLength = encryptionBlockSize;
if (bytesRead + blockLength >= sourceFileLength) {
blockLength = sourceFileLength - bytesRead;
var chunkSize = encryptionChunkSize;
if (bytesRead + chunkSize >= sourceFileLength) {
chunkSize = sourceFileLength - bytesRead;
tag = Sodium.cryptoSecretstreamXchacha20poly1305TagFinal;
}
final blockData = await inputFile.read(blockLength);
bytesRead += blockLength;
final buffer = await inputFile.read(chunkSize);
bytesRead += chunkSize;
final encryptedData = Sodium.cryptoSecretstreamXchacha20poly1305Push(
initPushResult.state, blockData, null, tag);
initPushResult.state, buffer, null, tag);
outputFile.writeFromSync(encryptedData);
}
await inputFile.close();
@ -112,14 +112,14 @@ class CryptoUtil {
var bytesRead = 0;
var tag = Sodium.cryptoSecretstreamXchacha20poly1305TagMessage;
while (tag != Sodium.cryptoSecretstreamXchacha20poly1305TagFinal) {
var blockLength = decryptionBlockSize;
if (bytesRead + blockLength >= sourceFileLength) {
blockLength = sourceFileLength - bytesRead;
var chunkSize = decryptionChunkSize;
if (bytesRead + chunkSize >= sourceFileLength) {
chunkSize = sourceFileLength - bytesRead;
}
final blockData = await inputFile.read(blockLength);
bytesRead += blockLength;
final buffer = await inputFile.read(chunkSize);
bytesRead += chunkSize;
final pullResult = Sodium.cryptoSecretstreamXchacha20poly1305Pull(
pullState, blockData, null);
pullState, buffer, null);
outputFile.writeFromSync(pullResult.m);
tag = pullResult.tag;
}