public int TransformBlock(byte[] inputBuffer, int inputOffset, int inputCount, byte[] outputBuffer, int outputOffset)
{
if (!_writeMode)
{
_hmacsha1.TransformBlock(inputBuffer, inputOffset, inputCount, inputBuffer, inputOffset);
}
for (int i = 0; i < inputCount; i++)
{
if (_encrPos == 16)
{
int num = 0;
while (++_counterNonce[num] == 0)
{
num++;
}
_encryptor.TransformBlock(_counterNonce, 0, _blockSize, _encryptBuffer, 0);
_encrPos = 0;
}
outputBuffer[i + outputOffset] = (byte)(inputBuffer[i + inputOffset] ^ _encryptBuffer[_encrPos++]);
}
if (_writeMode)
{
_hmacsha1.TransformBlock(outputBuffer, outputOffset, inputCount, outputBuffer, outputOffset);
}
return(inputCount);
}
// HKDF_SHA1
// libsscrypto/hkdf.c mbedtls_hkdf
public static byte[] GetAeadSubkey(byte[] key, byte[] salt, byte[] info, int outputLen)
{
byte[] prk;
using (var h = new HMACSHA1(salt)) {
prk = h.ComputeHash(key);
}
var N = outputLen / prk.Length;
if (outputLen % prk.Length != 0)
{
N++;
}
var T = new byte[0];
var c = new byte[1];
var output = new byte[outputLen];
var cur = 0;
using (var h = new HMACSHA1(prk)) {
for (int i = 0; i < N; i++)
{
h.TransformBlock(T, 0, T.Length, T, 0);
h.TransformBlock(info, 0, info.Length, info, 0);
c[0] = (byte)i;
T = h.TransformFinalBlock(c, 0, 1);
NaiveUtils.CopyBytes(T, 0, output, cur, (i < N) ? T.Length : outputLen - cur);
cur += T.Length;
}
}
return(output);
}
private void WriteTransformOneBlock(byte[] buffer, int offset)
{
Array.Copy(BitConverter.GetBytes(_nonce++), 0, counter, 0, 4);
_xform.TransformBlock(counter, 0, 16, counterOut, 0);
XorInPlace(buffer, offset, 16);
_mac.TransformBlock(buffer, offset, 16, null, 0);
}
private void WriteTransformOneBlock(byte[] buffer, int offset)
{
System.Array.Copy(BitConverter.GetBytes(_nonce++), 0, counter, 0, 4);
_xform.TransformBlock(counter,
0,
BLOCK_SIZE_IN_BYTES,
counterOut,
0);
XorInPlace(buffer, offset, BLOCK_SIZE_IN_BYTES);
_mac.TransformBlock(buffer, offset, BLOCK_SIZE_IN_BYTES, null, 0);
}
/// <summary>
/// returns the hmac of the data and the annotation chunk values (except HMAC chunk itself)
/// </summary>
protected byte[] hmac()
{
using (HMACSHA1 hmac = new HMACSHA1(Config.HMAC_KEY)) {
hmac.TransformBlock(this.data, 0, this.data.Length, this.data, 0);
foreach (var e in this.annotations)
{
if (e.Key != "HMAC")
{
hmac.TransformBlock(e.Value, 0, e.Value.Length, e.Value, 0);
}
}
hmac.TransformFinalBlock(this.data, 0, 0);
return(hmac.Hash);
}
}
/// <summary>
/// returns the hmac of the data and the annotation chunk values (except HMAC chunk itself)
/// </summary>
public byte[] hmac(byte[] key)
{
using (HMACSHA1 hmac = new HMACSHA1(key)) {
hmac.TransformBlock(this.data, 0, this.data.Length, this.data, 0);
foreach (var e in this.annotations.OrderBy(a => a.Key))
{
if (e.Key != "HMAC")
{
hmac.TransformBlock(e.Value, 0, e.Value.Length, e.Value, 0);
}
}
hmac.TransformFinalBlock(this.data, 0, 0);
return(hmac.Hash);
}
}
/// <summary>
/// Decrypts using AES/CBC/PKCS7 with an input byte array and key, using the IV (comprised of random bytes and the HMAC-SHA1 of the random bytes and plaintext) prepended using AES/ECB/None
/// </summary>
public static byte[] SymmetricDecryptHMACIV(byte[] input, byte[] key, byte[] hmacSecret)
{
Debug.Assert(key.Length >= 16);
var truncatedKeyForHmac = new byte[16];
Array.Copy(key, 0, truncatedKeyForHmac, 0, truncatedKeyForHmac.Length);
byte[] iv;
var plaintextData = SymmetricDecrypt(input, key, out iv);
// validate HMAC
byte[] hmacBytes;
using (var hmac = new HMACSHA1(hmacSecret))
{
hmac.TransformBlock(iv, iv.Length - 3, 3, null, 0);
hmac.TransformFinalBlock(plaintextData, 0, plaintextData.Length);
hmacBytes = hmac.Hash;
}
if (!hmacBytes.Take(iv.Length - 3).SequenceEqual(iv.Take(iv.Length - 3)))
{
throw new CryptographicException(string.Format(CultureInfo.InvariantCulture, "{0} was unable to decrypt packet: HMAC from server did not match computed HMAC.", nameof(NetFilterEncryption)));
}
return(plaintextData);
}
/// <summary>
/// Implement the ICryptoTransform method.
/// </summary>
public int TransformBlock(byte[] inputBuffer, int inputOffset, int inputCount, byte[] outputBuffer,
int outputOffset)
{
// Pass the data stream to the hash algorithm for generating the Auth Code.
// This does not change the inputBuffer. Do this before decryption for read mode.
if (!_writeMode)
{
#if !OS_WINDOWS
incrementalHash.AppendData(inputBuffer, inputOffset, inputCount);
#else
_hmacsha1.TransformBlock(inputBuffer, inputOffset, inputCount, inputBuffer, inputOffset);
#endif
}
// Encrypt with AES in CTR mode. Regards to Dr Brian Gladman for this.
int ix = 0;
while (ix < inputCount)
{
if (_encrPos == ENCRYPT_BLOCK)
{
/* increment encryption nonce */
int j = 0;
while (++_counterNonce[j] == 0)
{
++j;
}
/* encrypt the nonce to form next xor buffer */
_encryptor.TransformBlock(_counterNonce, 0, _blockSize, _encryptBuffer, 0);
_encrPos = 0;
}
outputBuffer[ix + outputOffset] = (byte)(inputBuffer[ix + inputOffset] ^ _encryptBuffer[_encrPos++]);
//
ix++;
}
if (_writeMode)
{
// This does not change the buffer.
#if !OS_WINDOWS
incrementalHash.AppendData(outputBuffer, outputOffset, inputCount);
#else
_hmacsha1.TransformBlock(outputBuffer, outputOffset, inputCount, outputBuffer, outputOffset);
#endif
}
return(inputCount);
}
public byte[] pyrohmac(byte[] data, IDictionary <string, byte[]> annotations)
{
using (HMACSHA1 hmac = new HMACSHA1(Config.HMAC_KEY)) {
hmac.TransformBlock(data, 0, data.Length, data, 0);
if (annotations != null)
{
foreach (var e in annotations)
{
if (e.Key != "HMAC")
{
hmac.TransformBlock(e.Value, 0, e.Value.Length, e.Value, 0);
}
}
}
hmac.TransformFinalBlock(data, 0, 0);
return(hmac.Hash);
}
}
public void CheckE(string testName, byte[] key, byte[] data, byte[] result)
{
algo = new HMACSHA1(key);
byte[] copy = new byte [data.Length];
// LAMESPEC or FIXME: TransformFinalBlock doesn't return HashValue !
for (int i = 0; i < data.Length - 1; i++)
{
algo.TransformBlock(data, i, 1, copy, i);
}
algo.TransformFinalBlock(data, data.Length - 1, 1);
Assert.AreEqual(result, algo.Hash, testName + "e");
}
public void GenerateSessionKey(byte[] clientSalt, byte[] serverSalt)
{
var hmac = new HMACSHA1(SecureRemotePassword.SessionKey);
var wow = Encoding.ASCII.GetBytes("WoW\0");
var wowSessionKey = new byte[0x28];
hmac.TransformBlock(wow, 0, wow.Length, wow, 0);
hmac.TransformBlock(clientSalt, 0, clientSalt.Length, clientSalt, 0);
hmac.TransformFinalBlock(serverSalt, 0, serverSalt.Length);
Buffer.BlockCopy(hmac.Hash, 0, wowSessionKey, 0, hmac.Hash.Length);
hmac.Initialize();
hmac.TransformBlock(wow, 0, wow.Length, wow, 0);
hmac.TransformBlock(serverSalt, 0, serverSalt.Length, serverSalt, 0);
hmac.TransformFinalBlock(clientSalt, 0, clientSalt.Length);
Buffer.BlockCopy(hmac.Hash, 0, wowSessionKey, hmac.Hash.Length, hmac.Hash.Length);
GameAccount.SessionKey = wowSessionKey.ToHexString();
// Update SessionKey in database
DB.Auth.Update(GameAccount, "SessionKey");
}
public int TransformBlock(byte[] inputBuffer, int inputOffset, int inputCount, byte[] outputBuffer, int outputOffset)
{
if (!_writeMode)
{
_hmacsha1.TransformBlock(inputBuffer, inputOffset, inputCount, inputBuffer, inputOffset);
}
for (int i = 0; i < inputCount; i++)
{
if (_encrPos == ENCRYPT_BLOCK)
{
for (int j = 0; (_counterNonce[j] = (byte)(_counterNonce[j] + 1)) == 0; j++)
{
}
_encryptor.TransformBlock(_counterNonce, 0, _blockSize, _encryptBuffer, 0);
_encrPos = 0;
}
outputBuffer[i + outputOffset] = (byte)(inputBuffer[i + inputOffset] ^ _encryptBuffer[_encrPos++]);
}
if (_writeMode)
{
_hmacsha1.TransformBlock(outputBuffer, outputOffset, inputCount, outputBuffer, outputOffset);
}
return(inputCount);
}
/// <summary>
/// Performs an encryption using AES/CBC/PKCS7 with an input byte array and key, with a IV (comprised of random bytes and the HMAC-SHA1 of the random bytes and plaintext) prepended using AES/ECB/None
/// </summary>
public static byte[] SymmetricEncryptWithHMACIV(byte[] input, byte[] key, byte[] hmacSecret)
{
// IV is HMAC-SHA1(Random(3) + Plaintext) + Random(3). (Same random values for both)
var iv = new byte[16];
var random = GenerateRandomBlock(3);
Array.Copy(random, 0, iv, iv.Length - random.Length, random.Length);
using (var hmac = new HMACSHA1(hmacSecret))
{
hmac.TransformBlock(random, 0, random.Length, null, 0);
hmac.TransformFinalBlock(input, 0, input.Length);
Array.Copy(hmac.Hash, iv, iv.Length - random.Length);
}
return(SymmetricEncryptWithIV(input, key, iv));
}
private int ReadTransformOneBlock(byte[] buffer, int offset, int last)
{
if (_finalBlock)
{
throw new NotSupportedException();
}
int bytesRemaining = last - offset;
int bytesToRead = (bytesRemaining > BLOCK_SIZE_IN_BYTES)
? BLOCK_SIZE_IN_BYTES
: bytesRemaining;
// update the counter
System.Array.Copy(BitConverter.GetBytes(_nonce++), 0, counter, 0, 4);
// Determine if this is the final block
if ((bytesToRead == bytesRemaining) &&
(_length > 0) &&
(_totalBytesXferred + last == _length))
{
_mac.TransformFinalBlock(buffer, offset, bytesToRead);
counterOut = _xform.TransformFinalBlock(counter,
0,
BLOCK_SIZE_IN_BYTES);
_finalBlock = true;
}
else
{
_mac.TransformBlock(buffer, offset, bytesToRead, null, 0);
_xform.TransformBlock(counter,
0, // offset
BLOCK_SIZE_IN_BYTES,
counterOut,
0); // offset
}
XorInPlace(buffer, offset, bytesToRead);
return(bytesToRead);
}
// This function is defined as follow :
// Func (S, i) = HMAC(S || i) | HMAC2(S || i) | ... | HMAC(iterations) (S || i)
// where i is the block number.
private byte[] Func()
{
byte[] INT_block = Int(m_block);
m_hmacsha1.TransformBlock(m_salt, 0, m_salt.Length, m_salt, 0);
m_hmacsha1.TransformFinalBlock(INT_block, 0, INT_block.Length);
byte[] temp = m_hmacsha1.Hash;
m_hmacsha1.Initialize();
byte[] ret = temp;
for (int i = 2; i <= m_iterations; i++)
{
temp = m_hmacsha1.ComputeHash(temp);
for (int j = 0; j < BlockSize; j++)
{
ret[j] ^= temp[j];
}
}
// increment the block count.
m_block++;
return(ret);
}
private int ReadTransformOneBlock(byte[] buffer, int offset, int last)
{
if (isFinalBlock)
{
throw new InvalidOperationException();
}
int bytesRemaining = last - offset;
int bytesToRead = (bytesRemaining > BLOCK_SIZE_IN_BYTES)
? BLOCK_SIZE_IN_BYTES
: bytesRemaining;
// update the counter
Array.Copy(BitConverter.GetBytes(_nonce++), 0, counter, 0, 4);
// Determine if this is the final block
if ((bytesToRead == bytesRemaining) && (totalBytesLeftToRead == 0))
{
hmac.TransformFinalBlock(buffer, offset, bytesToRead);
counterOut = transform.TransformFinalBlock(counter,
0,
BLOCK_SIZE_IN_BYTES);
isFinalBlock = true;
}
else
{
hmac.TransformBlock(buffer, offset, bytesToRead, null, 0);
transform.TransformBlock(counter,
0, // offset
BLOCK_SIZE_IN_BYTES,
counterOut,
0); // offset
}
XorInPlace(buffer, offset, bytesToRead);
return(bytesToRead);
}
/// <summary>
/// Returns the SHA1 HMAC of the given <paramref name="prefix"/>, the given <paramref name="request"/>'s
/// body, and the given <paramref name="suffix"/> (in that order).
/// </summary>
/// <param name="request">The current <see cref="HttpRequest"/>.</param>
/// <param name="secret">The key data used to initialize the <see cref="HMACSHA1"/>.</param>
/// <param name="prefix">
/// If non-<see langword="null"/> and non-empty, additional <c>byte</c>s to include in the hashed content
/// before the <paramref name="request"/>'s body.
/// </param>
/// <param name="suffix">
/// If non-<see langword="null"/> and non-empty, additional <c>byte</c>s to include in the hashed content
/// after the <paramref name="request"/>'s body.
/// </param>
/// <returns>
/// A <see cref="Task"/> that on completion provides a <see cref="byte"/> array containing the SHA1 HMAC of
/// the <paramref name="prefix"/>, the <paramref name="request"/>'s body, and the <paramref name="suffix"/>
/// (in that order).
/// </returns>
protected virtual async Task <byte[]> ComputeRequestBodySha1HashAsync(
HttpRequest request,
byte[] secret,
byte[] prefix,
byte[] suffix)
{
if (request == null)
{
throw new ArgumentNullException(nameof(request));
}
if (secret == null)
{
throw new ArgumentNullException(nameof(secret));
}
if (secret.Length == 0)
{
throw new ArgumentException(Resources.General_ArgumentCannotBeNullOrEmpty);
}
await WebHookHttpRequestUtilities.PrepareRequestBody(request);
using (var hasher = new HMACSHA1(secret))
{
try
{
if (prefix != null && prefix.Length > 0)
{
hasher.TransformBlock(
prefix,
inputOffset: 0,
inputCount: prefix.Length,
outputBuffer: null,
outputOffset: 0);
}
// Split body into 4K chunks.
var buffer = new byte[4096];
var inputStream = request.Body;
int bytesRead;
while ((bytesRead = await inputStream.ReadAsync(buffer, 0, buffer.Length)) > 0)
{
hasher.TransformBlock(
buffer,
inputOffset: 0,
inputCount: bytesRead,
outputBuffer: null,
outputOffset: 0);
}
if (suffix != null && suffix.Length > 0)
{
hasher.TransformBlock(
suffix,
inputOffset: 0,
inputCount: suffix.Length,
outputBuffer: null,
outputOffset: 0);
}
hasher.TransformFinalBlock(Array.Empty <byte>(), inputOffset: 0, inputCount: 0);
return(hasher.Hash);
}
finally
{
// Reset Position because JsonInputFormatter et cetera always start from current position.
request.Body.Seek(0L, SeekOrigin.Begin);
}
}
}
private int ProcessOneBlockWriting(byte[] buffer, int offset, int last)
{
if (_finalBlock)
{
throw new Exception("The final block has already been transformed.");
}
int bytesRemaining = last - offset;
int bytesToRead = (bytesRemaining > BLOCK_SIZE_IN_BYTES)
? BLOCK_SIZE_IN_BYTES
: bytesRemaining;
// update the counter
System.Array.Copy(BitConverter.GetBytes(_nonce++), 0, counter, 0, 4);
if (bytesToRead == (last - offset))
{
// We're doing the last bytes in this batch.
//
// For the AES encryption stream to work properly, We must transform full
// blocks of 16 bytes each, until the very last one. But, we don't know
// how to recognize the "last" bytes. The approach taken here: buffer
// the last full or partial block of bytes in a batch. Then at time of
// Close(), we set the _NextXformWillBeFinal flag and flush that buffer.
//
// This works when the caller writes in odd-sized batches, for example
// 5000 bytes, or in batches that are neat multiples of block-size (16).
if (_NextXformWillBeFinal)
{
//Console.WriteLine("WinZipAesCipherStream::ProcessOneBlockWriting: _NextXformWillBeFinal = true");
counterOut = _xform.TransformFinalBlock(counter,
0,
BLOCK_SIZE_IN_BYTES);
_finalBlock = true;
}
else if (buffer == _PendingWriteBuffer && bytesToRead == BLOCK_SIZE_IN_BYTES)
{
// Console.WriteLine("POBW({0},{1,5},{2,5}): pc({4}) flushing {3} bytes ...",
// _NextXformWillBeFinal, offset, last, bytesToRead, _pendingCount);
}
else
{
// NOT the final block, therefore buffer it.
// Console.WriteLine("POBW({0},{1,5},{2,5}): pc({4}) buffering {3} more bytes ...",
// _NextXformWillBeFinal, offset, last, bytesToRead, _pendingCount);
Array.Copy(buffer, offset,
_PendingWriteBuffer, _pendingCount,
bytesToRead);
_pendingCount += bytesToRead;
// remember to decrement the nonce.
_nonce--;
return(0);
}
}
if (!_finalBlock)
{
// Next, do the AES transform. According to the AES/CTR method used
// by WinZip, apply the transform to the counter, and then XOR
// the result with the ciphertext to get the plaintext.
_xform.TransformBlock(counter,
0, // offset
BLOCK_SIZE_IN_BYTES,
counterOut,
0); // offset
}
// XOR (in place)
//Console.Write("POBW({0},{1,5},{2,5}): ", _NextXformWillBeFinal, offset, last);
for (int i = 0; i < bytesToRead; i++)
{
buffer[offset + i] = (byte)(counterOut[i] ^ buffer[offset + i]);
//Console.Write("{0:X2} ", buffer[offset + i]);
}
//Console.WriteLine();
// when encrypting, do the MAC last
if (_finalBlock)
{
_mac.TransformFinalBlock(buffer, offset, bytesToRead);
}
else
{
_mac.TransformBlock(buffer, offset, bytesToRead, null, 0);
}
return(bytesToRead);
}
/// <summary>
/// <exception cref="IOException"/>
/// <exception cref="SpotifyAuthenticatedException"/>
/// <exception cref="AccessViolationException"/>
/// </summary>
private void Connect()
{
#region ClientHello Setup
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
var clientHello = new ClientHello
{
BuildInfo = new BuildInfo
{
Platform = Platform.Win32X86,
Product = Product.Client,
ProductFlags = { ProductFlags.ProductFlagNone },
Version = 112800721
}
};
clientHello.CryptosuitesSupported.Add(Cryptosuite.Shannon);
clientHello.LoginCryptoHello = new LoginCryptoHelloUnion
{
DiffieHellman = new LoginCryptoDiffieHellmanHello
{
Gc = ByteString.CopyFrom(keys.PublicKeyArray()),
ServerKeysKnown = 1
}
};
var nonce = new byte[16];
(new Random()).NextBytes(nonce);
clientHello.ClientNonce = ByteString.CopyFrom(nonce);
clientHello.Padding = ByteString.CopyFrom(new byte[1]
{
(byte)30
});
var clientHelloBytes = clientHello.ToByteArray();
var a = conn.Result.NetworkStream;
a.WriteByte(0x00);
a.WriteByte(0x04);
a.WriteByte(0x00);
a.WriteByte(0x00);
a.WriteByte(0x00);
a.Flush();
var length = 2 + 4 + clientHelloBytes.Length;
var bytes = BitConverter.GetBytes(length);
a.WriteByte(bytes[0]);
a.Write(clientHelloBytes, 0, clientHelloBytes.Length);
a.Flush();
var buffer = new byte[1000];
var len = int.Parse(a.Read(buffer, 0, buffer.Length).ToString());
var tmp = new byte[len];
Array.Copy(buffer, tmp, len);
tmp = tmp.Skip(4).ToArray();
var accumulator = new MemoryStream();
accumulator.WriteByte(0x00);
accumulator.WriteByte(0x04);
var lnarr = Utils.toByteArray(length);
accumulator.Write(lnarr, 0, lnarr.Length);
accumulator.Write((byte[])clientHelloBytes, 0, clientHelloBytes.Length);
var lenArr = Utils.toByteArray(len);
accumulator.Write(lenArr, 0, lenArr.Length);
accumulator.Write((byte[])tmp, 0, tmp.Length);
#endregion ClientHello Setup
//Read APResponseMessage
#region APResponse
var binaryData = accumulator.ToArray();
var apResponseMessage = APResponseMessage.Parser.ParseFrom(tmp);
var sharedKey = Utils.toByteArray(keys.ComputeSharedKey(apResponseMessage
.Challenge.LoginCryptoChallenge.DiffieHellman.Gs.ToByteArray()));
// Check gs_signature
var rsa = new RSACryptoServiceProvider();
var rsaKeyInfo = new RSAParameters
{
Modulus = new BigInteger(1, serverKey).ToByteArrayUnsigned(),
Exponent = BigInteger.ValueOf(65537).ToByteArrayUnsigned()
};
//Set to the public key values.
//Import key parameters into RSA.
rsa.ImportParameters(rsaKeyInfo);
var gs = apResponseMessage.Challenge.LoginCryptoChallenge.DiffieHellman.Gs.ToByteArray();
var sign = apResponseMessage.Challenge.LoginCryptoChallenge.DiffieHellman.GsSignature.ToByteArray();
if (!rsa.VerifyData(gs,
sign,
HashAlgorithmName.SHA1, RSASignaturePadding.Pkcs1))
{
throw new AccessViolationException("Failed to verify APResponse");
}
// Solve challenge
binaryData = accumulator.ToArray();
using var data = new MemoryStream();
var mac = new HMACSHA1(sharedKey);
mac.Initialize();
for (var i = 1; i < 6; i++)
{
mac.TransformBlock(binaryData, 0, binaryData.Length, null, 0);
var temp = new[] { (byte)i };
mac.TransformBlock(temp, 0, temp.Length, null, 0);
mac.TransformFinalBlock(new byte[0], 0, 0);
var final = mac.Hash;
data.Write(final, 0, final.Length);
mac = new HMACSHA1(sharedKey);
}
var dataArray = data.ToArray();
mac = new HMACSHA1(Arrays.CopyOfRange(dataArray, 0, 0x14));
mac.TransformBlock(binaryData, 0, binaryData.Length, null, 0);
mac.TransformFinalBlock(new byte[0], 0, 0);
var challenge = mac.Hash;
var clientResponsePlaintext = new ClientResponsePlaintext
{
LoginCryptoResponse = new LoginCryptoResponseUnion
{
DiffieHellman = new LoginCryptoDiffieHellmanResponse
{
Hmac = ByteString.CopyFrom(challenge)
}
},
PowResponse = new PoWResponseUnion(),
CryptoResponse = new CryptoResponseUnion()
};
var clientResponsePlaintextBytes = clientResponsePlaintext.ToByteArray();
len = 4 + clientResponsePlaintextBytes.Length;
a.WriteByte(0x00);
a.WriteByte(0x00);
a.WriteByte(0x00);
var bytesb = BitConverter.GetBytes(len);
a.WriteByte(bytesb[0]);
a.Write(clientResponsePlaintextBytes, 0, clientResponsePlaintextBytes.Length);
a.Flush();
try
{
var scrap = new byte[4];
conn.Result.NetworkStream.ReadTimeout = 300;
var read = conn.Result.NetworkStream.Read(scrap, 0, scrap.Length);
if (read == scrap.Length)
{
length = (scrap[0] << 24) | (scrap[1] << 16) | (scrap[2] << 8) | (scrap[3] & 0xFF);
var payload = new byte[length - 4];
conn.Result.NetworkStream.ReadComplete(payload, 0, payload.Length);
var failed = APResponseMessage.Parser.ParseFrom(payload)?.LoginFailed;
throw new SpotifyAuthenticatedException(failed);
}
else if (read > 0)
{
throw new Exception("Read unknown data!");
}
}
catch (Exception x)
{
// ignored
}
finally
{
conn.Result.NetworkStream.ReadTimeout = Timeout.Infinite;
}
using (authLock.Lock())
{
sendCipher = new Shannon();
sendCipher.key(Arrays.CopyOfRange(data.ToArray(), 0x14, 0x34));
recvCipher = new Shannon();
recvCipher.key(Arrays.CopyOfRange(data.ToArray(), 0x34, 0x54));
authLockEventWaitHandle.Set();
}
#endregion APResponse
Debug.WriteLine("Connected successfully");
}
private int ProcessOneBlockWriting(byte[] buffer, int offset, int last)
{
if (_finalBlock)
{
throw new InvalidOperationException("The final block has already been transformed.");
}
int bytesRemaining = last - offset;
int bytesToRead = (bytesRemaining > BLOCK_SIZE_IN_BYTES)
? BLOCK_SIZE_IN_BYTES
: bytesRemaining;
// update the counter
System.Array.Copy(BitConverter.GetBytes(_nonce++), 0, counter, 0, 4);
// We're doing the last bytes in this batch.
//
// For the AES encryption stream to work properly, We must transform
// blocks of 16 bytes, via TransformBlock, until the very last one, for
// which we call TransformFinalBlock. But, we don't know how to
// recognize the "last" bytes. The approach taken here: maintain a
// buffer, so that one full or partial block of bytes is always
// available. This is the _PendingWriteBuffer. Then at time of
// Close(), we set the _NextXformWillBeFinal flag and flush that buffer.
//
// This works whether the caller writes in odd-sized batches, for example
// 5000 bytes, or in batches that are neat multiples of the blocksize (16).
// bytesToRead is always 16 or less. If it is exactly what remains, then we need to
// either, if this is the final block, do the final transform, else buffer the data.
if (bytesToRead == (last - offset))
{
if (_NextXformWillBeFinal)
{
//Console.WriteLine("WinZipAesCipherStream::ProcessOneBlockWriting: _NextXformWillBeFinal = true");
counterOut = _xform.TransformFinalBlock(counter,
0,
BLOCK_SIZE_IN_BYTES);
_finalBlock = true;
}
else if (buffer == _PendingWriteBuffer && bytesToRead == BLOCK_SIZE_IN_BYTES)
{
// this happens with a Flush(), I think.
}
else
{
// NOT the final block, therefore buffer it.
Array.Copy(buffer, offset,
_PendingWriteBuffer, _pendingCount,
bytesToRead);
_pendingCount += bytesToRead;
// remember to decrement the nonce.
_nonce--;
return(bytesToRead);
}
}
if (!_finalBlock)
{
// Next, do the AES transform. According to the AES/CTR method used
// by WinZip, apply the transform to the counter, and then XOR
// the result with the ciphertext to get the plaintext.
_xform.TransformBlock(counter,
0, // offset
BLOCK_SIZE_IN_BYTES,
counterOut,
0); // offset
}
// XOR (in place)
for (int i = 0; i < bytesToRead; i++)
{
buffer[offset + i] = (byte)(counterOut[i] ^ buffer[offset + i]);
}
// when encrypting, do the MAC last
if (_finalBlock)
{
_mac.TransformFinalBlock(buffer, offset, bytesToRead);
}
else
{
_mac.TransformBlock(buffer, offset, bytesToRead, null, 0);
}
return(bytesToRead);
}