public void Init(string passkey)
{
//0-4
AssertNextBytesEqual(Safe.Tag);
//5-36
var salt = ReadBytes(Safe.SaltLengthV3);
//37-40
var iterations = ReadUInt32();
var keyCipher = new KeyCipher(_crypto, false, passkey, salt, iterations);
//41-72
var expectedKeyHash = ReadBytes(Safe.StretchedPasskeyHashLength);
if (!keyCipher.ValidateHashedKey(expectedKeyHash))
{
throw new InvalidPasskeyException();
}
//73-104
var dataKey = Decrypt(keyCipher, Safe.DataKeyLength);
//105-136
var hmacKey = Decrypt(keyCipher, Safe.HmacKeyLength);
//137-152
var dataInitializationVector = ReadBytes(Safe.DataInitializationVectorLength);
_dataCipher = new DataCipher(false, dataKey, dataInitializationVector);
_hmac = _crypto.HMACSHA256Factory.From(hmacKey);
}
public void Init(string passkey, UInt32 iterations)
{
WriteBytes(Safe.Tag);
var salt = GetRandomData(Safe.SaltLengthV3);
var sha256 = _crypto.SHA256ManagedFactory.New();
if (salt.Length != Safe.SaltLengthV3)
{
throw new Exception("Invalid salt length");
}
salt = sha256.ComputeHash(salt);
WriteBytes(salt);
WriteBytes(BitConverter.GetBytes(iterations));
var keyCipher = new KeyCipher(_crypto, true, passkey, salt, iterations);
var keyHash = keyCipher.GetHashedKey();
if (keyHash.Length != Safe.StretchedPasskeyHashLength)
{
throw new Exception("Invalid hashed key length");
}
WriteBytes(keyHash);
var dataKey = GetRandomData(Safe.DataKeyLength);
var encryptedDataKey = new byte[dataKey.Length];
var l1 = keyCipher.ProcessBytes(dataKey, 0, dataKey.Length, encryptedDataKey, 0);
keyCipher.DoFinal(encryptedDataKey, l1);
WriteBytes(encryptedDataKey);
var hmacKey = GetRandomData(Safe.HmacKeyLength);
var encryptedHmacKey = new byte[hmacKey.Length];
l1 = keyCipher.ProcessBytes(hmacKey, 0, encryptedHmacKey.Length, encryptedHmacKey, 0);
keyCipher.DoFinal(encryptedHmacKey, l1);
WriteBytes(encryptedHmacKey);
var dataInitializationVector = GetRandomData(Safe.DataInitializationVectorLength);
var hasher = _crypto.SHA256ManagedFactory.New();
var hashedDataInitializationVector = hasher.ComputeHash(dataInitializationVector);
Buffer.BlockCopy(hashedDataInitializationVector, 0, dataInitializationVector, 0, Safe.DataInitializationVectorLength);
WriteBytes(dataInitializationVector);
_dataCipher = new DataCipher(true, dataKey, dataInitializationVector);
_hmac = _crypto.HMACSHA256Factory.From(hmacKey);
}