private static string GenerateHash(string email, byte[] passwordAesKey)
{
byte[] emailBytes = email.ToBytes();
byte[] hash = new byte[16];
// Compute email in 16 bytes array
for (int i = 0; i < emailBytes.Length; i++)
{
hash[i % 16] ^= emailBytes[i];
}
// Encrypt hash using password key
using (var encryptor = Crypto.CreateAesEncryptor(passwordAesKey))
{
for (int it = 0; it < 16384; it++)
{
hash = Crypto.EncryptAes(hash, encryptor);
}
}
// Retrieve bytes 0-4 and 8-12 from the hash
byte[] result = new byte[8];
Array.Copy(hash, 0, result, 0, 4);
Array.Copy(hash, 8, result, 4, 4);
return(result.ToBase64());
}
protected MegaAesCtrStream(Stream stream, long streamLength, Mode mode, byte[] fileKey, byte[] iv)
{
if (stream == null)
{
throw new ArgumentNullException("stream");
}
if (fileKey == null || fileKey.Length != 16)
{
throw new ArgumentException("Invalid fileKey");
}
if (iv == null || iv.Length != 8)
{
throw new ArgumentException("Invalid Iv");
}
this.stream = stream;
this.streamLength = streamLength;
this.mode = mode;
this.fileKey = fileKey;
this.iv = iv;
this.ChunksPositions = this.GetChunksPositions(this.streamLength).ToArray();
this.chunksPositionsCache = new HashSet <long>(this.ChunksPositions);
this.encryptor = Crypto.CreateAesEncryptor(this.fileKey);
}
// Token: 0x060007EF RID: 2031 RVA: 0x00039820 File Offset: 0x00037A20
public static byte[] EncryptAes(byte[] data, byte[] key)
{
byte[] result;
using (ICryptoTransform cryptoTransform = Crypto.CreateAesEncryptor(key))
{
result = cryptoTransform.TransformFinalBlock(data, 0, data.Length);
}
return(result);
}
// Token: 0x060007EA RID: 2026 RVA: 0x000396CC File Offset: 0x000378CC
public static byte[] EncryptKey(byte[] data, byte[] key)
{
byte[] array = new byte[data.Length];
using (ICryptoTransform cryptoTransform = Crypto.CreateAesEncryptor(key))
{
for (int i = 0; i < data.Length; i += 16)
{
Array.Copy(Crypto.EncryptAes(data.CopySubArray(16, i), cryptoTransform), 0, array, i, 16);
}
}
return(array);
}
// Token: 0x0600094F RID: 2383 RVA: 0x0004C2F0 File Offset: 0x0004A4F0
private static string GenerateHash(string email, byte[] passwordAesKey)
{
byte[] array = email.ToBytes();
byte[] array2 = new byte[16];
for (int i = 0; i < array.Length; i++)
{
byte[] array3 = array2;
int num = i % 16;
array3[num] ^= array[i];
}
using (ICryptoTransform cryptoTransform = Crypto.CreateAesEncryptor(passwordAesKey))
{
for (int j = 0; j < 16384; j++)
{
array2 = Crypto.EncryptAes(array2, cryptoTransform);
}
}
byte[] array4 = new byte[8];
Array.Copy(array2, 0, array4, 0, 4);
Array.Copy(array2, 8, array4, 4, 4);
return(array4.ToBase64());
}
protected MegaAesCtrStream(Stream stream, long streamLength, Mode mode, byte[] fileKey, byte[] iv)
{
if (fileKey == null || fileKey.Length != 16)
{
throw new ArgumentException("Invalid fileKey");
}
if (iv == null || iv.Length != 8)
{
throw new ArgumentException("Invalid Iv");
}
_stream = stream ?? throw new ArgumentNullException(nameof(stream));
StreamLength = streamLength;
_mode = mode;
FileKey = fileKey;
Iv = iv;
ChunksPositions = GetChunksPositions(StreamLength).ToArray();
_chunksPositionsCache = new HashSet <long>(ChunksPositions);
_encryptor = Crypto.CreateAesEncryptor(FileKey);
}
