public static async Task <bool> EncryptFilename(string uploadfilename, string enckey, string checkpoint, CancellationToken ct = default(CancellationToken))
{
int retry = 30;
while (--retry > 0)
{
var child = (await GetChanges(checkpoint, ct).ConfigureAwait(false)).Where(x => x.name.Contains(uploadfilename)).LastOrDefault();
if (child?.status == "AVAILABLE")
{
Config.Log.LogOut("EncryptFilename");
using (var ms = new MemoryStream())
{
byte[] plain = Encoding.UTF8.GetBytes(enckey);
ms.Write(plain, 0, plain.Length);
ms.Position = 0;
using (var enc = new CryptCTR.AES256CTR_CryptStream(ms, child.id))
{
byte[] buf = new byte[ms.Length];
enc.Read(buf, 0, buf.Length);
string cryptname = "";
foreach (var c in buf)
{
cryptname += (char)('\u2800' + c);
}
int retry2 = 30;
FileMetadata_Info reItem = null;
while (--retry2 > 0)
{
try
{
if (reItem == null)
{
reItem = await Drive.renameItem(id : child.id, newname : cryptname, ct : ct).ConfigureAwait(false);
}
}
catch { }
var child2 = (await GetChanges(checkpoint: ChangeCheckpoint, ct: ct).ConfigureAwait(false)).Where(x => x.name.Contains(cryptname)).LastOrDefault();
if (reItem != null && child2?.status == "AVAILABLE")
{
AmazonDriveTree[reItem.id].IsEncrypted = CryptMethods.Method1_CTR;
AmazonDriveTree[reItem.id].ReloadCryptedMethod1();
break;
}
await Task.Delay(2000).ConfigureAwait(false);
}
return(true);
}
}
}
await Task.Delay(2000).ConfigureAwait(false);
}
return(false);
}
public static string DecryptFilename(FileMetadata_Info downloaditem)
{
using (var ms = new MemoryStream())
{
string cryptname = downloaditem?.name;
if (string.IsNullOrEmpty(cryptname))
{
return(null);
}
byte[] buf = new byte[cryptname.Length];
int i = 0;
foreach (var c in cryptname)
{
if (c < '\u2800' || c > '\u28ff')
{
return(null);
}
buf[i++] = (byte)(c - '\u2800');
}
ms.Write(buf, 0, i);
ms.Position = 0;
using (var dec = new CryptCTR.AES256CTR_CryptStream(ms, downloaditem.id))
{
byte[] plain = new byte[i];
dec.Read(plain, 0, plain.Length);
var plainname = Encoding.UTF8.GetString(plain);
if (plainname.IndexOfAny(Path.GetInvalidFileNameChars()) < 0)
{
if (Regex.IsMatch(plainname ?? "", ".*?\\.[a-z0-9]{8}$"))
{
return(plainname);
}
else
{
return(null);
}
}
else
{
return(null);
}
}
}
}
