private void GetPartsFromUri(Uri uri, out string id, out byte[] iv, out byte[] metaMac, out byte[] key)
{
Regex uriRegex = new Regex("#(?<type>F?)!(?<id>.+)!(?<key>.+)");
Match match = uriRegex.Match(uri.Fragment);
if (match.Success == false)
{
throw new ArgumentException(string.Format("Invalid uri. Unable to extract Id and Key from the uri {0}", uri));
}
id = match.Groups["id"].Value;
byte[] decryptedKey = match.Groups["key"].Value.FromBase64();
var isFolder = match.Groups["type"].Value == "F";
if (isFolder)
{
iv = null;
metaMac = null;
key = decryptedKey;
}
else
{
Crypto.GetPartsFromDecryptedKey(decryptedKey, out iv, out metaMac, out key);
}
}
/// <summary>
/// Retrieve a Stream to download and decrypt the specified Uri
/// </summary>
/// <param name="uri">Uri to download</param>
/// <param name="dataSize">Fill</param>
/// <exception cref="NotSupportedException">Not logged in</exception>
/// <exception cref="ApiException">Mega.co.nz service reports an error</exception>
/// <exception cref="ArgumentNullException">uri is null</exception>
/// <exception cref="ArgumentException">Uri is not valid (id and key are required)</exception>
/// <exception cref="DownloadException">Checksum is invalid. Downloaded data are corrupted</exception>
public Stream Download(Uri uri, ref long dataSize)
{
if (uri == null)
{
throw new ArgumentNullException("uri");
}
this.EnsureLoggedIn();
Regex uriRegex = new Regex("#!(?<id>.+)!(?<key>.+)");
Match match = uriRegex.Match(uri.Fragment);
if (match.Success == false)
{
throw new ArgumentException(string.Format("Invalid uri. Unable to extract Id and Key from the uri {0}", uri));
}
string id = match.Groups["id"].Value;
byte[] decryptedKey = match.Groups["key"].Value.FromBase64();
byte[] iv;
byte[] metaMac;
byte[] fileKey;
Crypto.GetPartsFromDecryptedKey(decryptedKey, out iv, out metaMac, out fileKey);
// Retrieve download URL
DownloadUrlRequestFromId downloadRequest = new DownloadUrlRequestFromId(id);
DownloadUrlResponse downloadResponse = this.Request <DownloadUrlResponse>(downloadRequest);
Stream dataStream = this._webClient.GetRequestRaw(new Uri(downloadResponse.Url));
dataSize = downloadResponse.Size;
return(new MegaAesCtrStreamDecrypter(dataStream, downloadResponse.Size, fileKey, iv, metaMac));
}
public void OnDeserialized(StreamingContext ctx)
{
// Add key from incoming sharing.
if (this.SharingKey != null && this.sharedKeys.Any(x => x.Id == this.Id) == false)
{
this.sharedKeys.Add(new SharedKey(this.Id, this.SharingKey));
}
this.CreationDate = this.SerializedCreationDate.ToDateTime();
if (this.Type == NodeType.File || this.Type == NodeType.Directory)
{
// There are cases where the SerializedKey property contains multiple keys separated with /
// This can occur when a folder is shared and the parent is shared too.
// Both keys are working so we use the first one
string serializedKey = this.SerializedKey.Split('/')[0];
int splitPosition = serializedKey.IndexOf(":", StringComparison.Ordinal);
byte[] encryptedKey = serializedKey.Substring(splitPosition + 1).FromBase64();
// If node is shared, we need to retrieve shared masterkey
if (this.sharedKeys != null)
{
string handle = serializedKey.Substring(0, splitPosition);
SharedKey sharedKey = this.sharedKeys.FirstOrDefault(x => x.Id == handle);
if (sharedKey != null)
{
this.masterKey = Crypto.DecryptKey(sharedKey.Key.FromBase64(), this.masterKey);
if (this.Type == NodeType.Directory)
{
this.SharedKey = this.masterKey;
}
else
{
this.SharedKey = Crypto.DecryptKey(encryptedKey, this.masterKey);
}
}
}
this.FullKey = Crypto.DecryptKey(encryptedKey, this.masterKey);
if (this.Type == NodeType.File)
{
byte[] iv, metaMac, fileKey;
Crypto.GetPartsFromDecryptedKey(this.FullKey, out iv, out metaMac, out fileKey);
this.Iv = iv;
this.MetaMac = metaMac;
this.Key = fileKey;
}
else
{
this.Key = this.FullKey;
}
this.Attributes = Crypto.DecryptAttributes(this.SerializedAttributes.FromBase64(), this.Key);
}
}
public void OnDeserialized(StreamingContext ctx)
{
if (this.SharingKey != null && !this.sharedKeys.Any((SharedKey x) => x.Id == base.Id))
{
this.sharedKeys.Add(new SharedKey(base.Id, this.SharingKey));
}
this.CreationDate = this.SerializedCreationDate.ToDateTime();
if (base.Type == NodeType.File || base.Type == NodeType.Directory)
{
if (string.IsNullOrEmpty(this.SerializedKey))
{
this.EmptyKey = true;
return;
}
string text = this.SerializedKey.Split(new char[]
{
'/'
})[0];
int num = text.IndexOf(":", StringComparison.Ordinal);
byte[] data = text.Substring(num + 1).FromBase64();
if (this.sharedKeys != null)
{
string handle = text.Substring(0, num);
SharedKey sharedKey = this.sharedKeys.FirstOrDefault((SharedKey x) => x.Id == handle);
if (sharedKey != null)
{
this.masterKey = Crypto.DecryptKey(sharedKey.Key.FromBase64(), this.masterKey);
if (base.Type == NodeType.Directory)
{
this.SharedKey = this.masterKey;
}
else
{
this.SharedKey = Crypto.DecryptKey(data, this.masterKey);
}
}
}
this.FullKey = Crypto.DecryptKey(data, this.masterKey);
if (base.Type == NodeType.File)
{
byte[] iv;
byte[] metaMac;
byte[] key;
Crypto.GetPartsFromDecryptedKey(this.FullKey, out iv, out metaMac, out key);
this.Iv = iv;
this.MetaMac = metaMac;
this.Key = key;
}
else
{
this.Key = this.FullKey;
}
base.Attributes = Crypto.DecryptAttributes(this.SerializedAttributes.FromBase64(), this.Key);
}
}
private void GetPartsFromUri(Uri uri, out string id, out byte[] iv, out byte[] metaMac, out byte[] fileKey)
{
Regex uriRegex = new Regex("#!(?<id>.+)!(?<key>.+)");
Match match = uriRegex.Match(uri.Fragment);
if (match.Success == false)
{
throw new ArgumentException(string.Format("Invalid uri. Unable to extract Id and Key from the uri {0}", uri));
}
id = match.Groups["id"].Value;
byte[] decryptedKey = match.Groups["key"].Value.FromBase64();
Crypto.GetPartsFromDecryptedKey(decryptedKey, out iv, out metaMac, out fileKey);
}
// Token: 0x06000959 RID: 2393 RVA: 0x0004C704 File Offset: 0x0004A904
private void GetPartsFromUri(Uri uri, out string id, out byte[] iv, out byte[] metaMac, out byte[] key)
{
byte[] array;
bool flag;
if (!this.TryGetPartsFromUri(uri, out id, out array, out flag) && !this.TryGetPartsFromLegacyUri(uri, out id, out array, out flag))
{
throw new ArgumentException(string.Format("Invalid uri. Unable to extract Id and Key from the uri {0}", uri));
}
if (flag)
{
iv = null;
metaMac = null;
key = array;
return;
}
Crypto.GetPartsFromDecryptedKey(array, out iv, out metaMac, out key);
}
public void OnDeserialized(StreamingContext ctx)
{
// Add key from incoming sharing.
if (this.SharingKey != null && this.sharedKeys.Any(x => x.Id == this.Id) == false)
{
this.sharedKeys.Add(new SharedKey(this.Id, this.SharingKey));
}
this.CreationDate = this.SerializedCreationDate.ToDateTime();
if (this.Type == NodeType.File || this.Type == NodeType.Directory)
{
// Check if file is not yet decrypted
if (string.IsNullOrEmpty(this.SerializedKey))
{
this.EmptyKey = true;
return;
}
// There are cases where the SerializedKey property contains multiple keys separated with /
// This can occur when a folder is shared and the parent is shared too.
// Both keys are working so we use the first one
string serializedKey = this.SerializedKey.Split('/')[0];
int splitPosition = serializedKey.IndexOf(":", StringComparison.Ordinal);
byte[] encryptedKey = serializedKey.Substring(splitPosition + 1).FromBase64();
// If node is shared, we need to retrieve shared masterkey
if (this.sharedKeys != null)
{
string handle = serializedKey.Substring(0, splitPosition);
SharedKey sharedKey = this.sharedKeys.FirstOrDefault(x => x.Id == handle);
if (sharedKey != null)
{
this.masterKey = Crypto.DecryptKey(sharedKey.Key.FromBase64(), this.masterKey);
if (this.Type == NodeType.Directory)
{
this.SharedKey = this.masterKey;
}
else
{
this.SharedKey = Crypto.DecryptKey(encryptedKey, this.masterKey);
}
}
}
this.FullKey = Crypto.DecryptKey(encryptedKey, this.masterKey);
if (this.Type == NodeType.File)
{
byte[] iv, metaMac, fileKey;
Crypto.GetPartsFromDecryptedKey(this.FullKey, out iv, out metaMac, out fileKey);
this.Iv = iv;
this.MetaMac = metaMac;
this.Key = fileKey;
}
else
{
this.Key = this.FullKey;
}
this.Attributes = Crypto.DecryptAttributes(this.SerializedAttributes.FromBase64(), this.Key);
if (this.SerializedFileAttributes != null)
{
var attributes = this.SerializedFileAttributes.Split('/');
this.FileAttributes = attributes
.Select(_ => FileAttributeRegex.Match(_))
.Where(_ => _.Success)
.Select(_ => new FileAttribute(
int.Parse(_.Groups["id"].Value),
(FileAttributeType)Enum.Parse(typeof(FileAttributeType), _.Groups["type"].Value),
_.Groups["handle"].Value))
.ToArray();
}
}
}
public void OnDeserialized(StreamingContext ctx)
{
object[] context = (object[])ctx.Context;
GetNodesResponse nodesResponse = (GetNodesResponse)context[0];
if (context.Length == 1)
{
// Add key from incoming sharing.
if (this.SharingKey != null)
{
nodesResponse.SharedKeys.Add(new GetNodesResponse.SharedKey(this.Id, this.SharingKey));
}
return;
}
else
{
byte[] masterKey = (byte[])context[1];
this.LastModificationDate = OriginalDateTime.AddSeconds(this.SerializedLastModificationDate).ToLocalTime();
if (this.Type == NodeType.File || this.Type == NodeType.Directory)
{
// There are cases where the SerializedKey property contains multiple keys separated with /
// This can occur when a folder is shared and the parent is shared too.
// Both keys are working so we use the first one
string serializedKey = this.SerializedKey.Split('/')[0];
int splitPosition = serializedKey.IndexOf(":", StringComparison.InvariantCulture);
byte[] encryptedKey = serializedKey.Substring(splitPosition + 1).FromBase64();
// If node is shared, we need to retrieve shared masterkey
if (nodesResponse.SharedKeys != null)
{
string handle = serializedKey.Substring(0, splitPosition);
GetNodesResponse.SharedKey sharedKey = nodesResponse.SharedKeys.FirstOrDefault(x => x.Id == handle);
if (sharedKey != null)
{
masterKey = Crypto.DecryptKey(sharedKey.Key.FromBase64(), masterKey);
if (this.Type == NodeType.Directory)
{
this.SharedKey = masterKey;
}
else
{
this.SharedKey = Crypto.DecryptKey(encryptedKey, masterKey);
}
}
}
this.Key = Crypto.DecryptKey(encryptedKey, masterKey);
if (this.Type == NodeType.File)
{
byte[] iv, metaMac, fileKey;
Crypto.GetPartsFromDecryptedKey(this.Key, out iv, out metaMac, out fileKey);
this.Iv = iv;
this.MetaMac = metaMac;
this.Key = fileKey;
}
Attributes attributes = Crypto.DecryptAttributes(this.SerializedAttributes.FromBase64(), this.Key);
this.Name = attributes.Name;
}
}
}
public void OnDeserialized(StreamingContext ctx)
{
// Add key from incoming sharing.
if (SharingKey != null && _sharedKeys.Any(x => x.Id == Id) == false)
{
_sharedKeys.Add(new SharedKey(Id, SharingKey));
}
CreationDate = SerializedCreationDate.ToDateTime();
if (Type == NodeType.File || Type == NodeType.Directory)
{
// Check if file is not yet decrypted
if (string.IsNullOrEmpty(SerializedKey))
{
EmptyKey = true;
return;
}
// There are cases where the SerializedKey property contains multiple keys separated with /
// This can occur when a folder is shared and the parent is shared too.
// Both keys are working so we use the first one
var serializedKey = SerializedKey.Split('/')[0];
var splitPosition = serializedKey.IndexOf(":", StringComparison.Ordinal);
var encryptedKey = serializedKey.Substring(splitPosition + 1).FromBase64();
// If node is shared, we need to retrieve shared masterkey
if (_sharedKeys != null)
{
var handle = serializedKey.Substring(0, splitPosition);
var sharedKey = _sharedKeys.FirstOrDefault(x => x.Id == handle);
if (sharedKey != null)
{
_masterKey = Crypto.DecryptKey(sharedKey.Key.FromBase64(), _masterKey);
if (Type == NodeType.Directory)
{
SharedKey = _masterKey;
}
else
{
SharedKey = Crypto.DecryptKey(encryptedKey, _masterKey);
}
}
}
if (encryptedKey.Length != 16 && encryptedKey.Length != 32)
{
// Invalid key size
return;
}
FullKey = Crypto.DecryptKey(encryptedKey, _masterKey);
if (Type == NodeType.File)
{
Crypto.GetPartsFromDecryptedKey(FullKey, out var iv, out var metaMac, out var fileKey);
Iv = iv;
MetaMac = metaMac;
Key = fileKey;
}
else
{
Key = FullKey;
}
Attributes = Crypto.DecryptAttributes(SerializedAttributes.FromBase64(), Key);
FileAttributes = DeserializeFileAttributes(SerializedFileAttributes);
}
}
