public void EncryptSegments()
{
var ciphertextActual = new byte[_plaintext.Length + XSalsa20Poly1305.MacSizeInBytes].Pad();
XSalsa20Poly1305.Encrypt(ciphertextActual, _plaintext.Pad(), _key.Pad(), _nonce.Pad());
TestHelpers.AssertEqualBytes(_ciphertext, ciphertextActual.UnPad());
}
PullMsgResult ProduceWelcome(ref Msg msg)
{
Span <byte> cookieNonce = stackalloc byte[Curve25519XSalsa20Poly1305.NonceLength];
Span <byte> cookiePlaintext = stackalloc byte[64];
Span <byte> cookieCiphertext = stackalloc byte[64 + XSalsa20Poly1305.TagLength];
// Create full nonce for encryption
// 8-byte prefix plus 16-byte random nonce
CookieNoncePrefix.CopyTo(cookieNonce);
using var rng = RandomNumberGenerator.Create();
#if NETSTANDARD2_1
rng.GetBytes(cookieNonce.Slice(8));
#else
byte[] temp = new byte[16];
rng.GetBytes(temp);
temp.CopyTo(cookieNonce.Slice(8));
#endif
// Generate cookie = Box [C' + s'](t)
m_cnClientKey.CopyTo(cookiePlaintext);
m_cnSecretKey.CopyTo(cookiePlaintext.Slice(32));
// Generate fresh cookie key
rng.GetBytes(m_cookieKey);
// Encrypt using symmetric cookie key
using var secretBox = new XSalsa20Poly1305(m_cookieKey);
secretBox.Encrypt(cookieCiphertext, cookiePlaintext, cookieNonce);
cookiePlaintext.Clear();
Span <byte> welcomeNonce = stackalloc byte[Curve25519XSalsa20Poly1305.NonceLength];
Span <byte> welcomePlaintext = stackalloc byte[128];
Span <byte> welcomeCiphertext = stackalloc byte[128 + Curve25519XSalsa20Poly1305.TagLength];
// Create full nonce for encryption
// 8-byte prefix plus 16-byte random nonce
WelcomeNoncePrefix.CopyTo(welcomeNonce);
#if NETSTANDARD2_1
rng.GetBytes(welcomeNonce.Slice(8));
#else
rng.GetBytes(temp);
temp.CopyTo(welcomeNonce.Slice(8));
#endif
// Create 144-byte Box [S' + cookie](S->C')
m_cnPublicKey.CopyTo(welcomePlaintext);
cookieNonce.Slice(8).CopyTo(welcomePlaintext.Slice(32));
cookieCiphertext.CopyTo(welcomePlaintext.Slice(48));
using var box = new Curve25519XSalsa20Poly1305(m_secretKey, m_cnClientKey);
box.Encrypt(welcomeCiphertext, welcomePlaintext, welcomeNonce);
welcomePlaintext.Clear();
msg.InitPool(168); // TODO: we can save some allocation here by allocating this earlier
Span <byte> welcome = msg;
WelcomeLiteral.CopyTo(welcome);
welcomeNonce.Slice(8, 16).CopyTo(welcome.Slice(8));
welcomeCiphertext.CopyTo(welcome.Slice(24));
return(PullMsgResult.Ok);
}
/// <summary>
/// Attempt to decrypt a byte array using the Secret key.
/// </summary>
/// <param name="Payload"></param>
/// <param name="OriginalNonce"></param>
/// <returns>Null if authenticated decrypt fails.</returns>
public byte[] TryDecrypt(byte[] Payload, byte[] OriginalNonce)
{
if (!Initialized)
{
throw new NullReferenceException("Keys object not initilized with an e-mail address and passphrase.");
}
return(XSalsa20Poly1305.TryDecrypt(Payload, Secret, OriginalNonce));
}
public void DecryptFail()
{
foreach (var brokenCiphertext in _ciphertext.WithChangedBit())
{
var plaintextActual = XSalsa20Poly1305.TryDecrypt(brokenCiphertext, _key, _nonce);
Assert.AreEqual(null, plaintextActual);
}
}
public void DecryptSuccessSegments()
{
var plaintextActual = new byte[_ciphertext.Length - XSalsa20Poly1305.MacSizeInBytes].Pad();
var success = XSalsa20Poly1305.TryDecrypt(plaintextActual, _ciphertext.Pad(), _key.Pad(), _nonce.Pad());
Assert.IsTrue(success);
TestHelpers.AssertEqualBytes(_plaintext, plaintextActual.UnPad());
}
/// <summary>
/// Attempt to decrypt a byte array using the Shared key between a sender's Public miniLock ID and the Secret key.
/// </summary>
/// <param name="SenderPublicKey"></param>
/// <param name="Payload"></param>
/// <param name="OriginalNonce"></param>
/// <returns>Null if authenticated decrypt fails.</returns>
public byte[] TryDecrypt(string SenderPublicID, bool SenderPublicIDIsBase64Encoded, byte[] Payload, byte[] OriginalNonce)
{
if (!Initialized)
{
throw new NullReferenceException("Keys object not initilized with an e-mail address and passphrase.");
}
return(XSalsa20Poly1305.TryDecrypt(Payload, GetShared(SenderPublicID, SenderPublicIDIsBase64Encoded), OriginalNonce));
}
/// <summary>
/// Attempt to decrypt a byte array using the Shared key between a sender's Public Key byte array and the Secret key.
/// </summary>
/// <param name="SenderPublicKey"></param>
/// <param name="Payload"></param>
/// <param name="OriginalNonce"></param>
/// <returns>Null if authenticated decrypt fails.</returns>
public byte[] TryDecrypt(byte[] SenderPublicKey, byte[] Payload, byte[] OriginalNonce)
{
if (!Initialized)
{
throw new NullReferenceException("Keys object not initilized with an e-mail address and passphrase.");
}
byte[] shared = GetShared(SenderPublicKey);
return(XSalsa20Poly1305.TryDecrypt(Payload, shared, OriginalNonce));
}
public void RoundTripSuccessWithManyLengths()
{
for (int length = 0; length < 1000; length++)
{
var plaintextExpected = Enumerable.Range(0, length).Select(i => (byte)i).ToArray();
var ciphertext = XSalsa20Poly1305.Encrypt(plaintextExpected.ToArray(), _key, _nonce);
var plaintextActual = XSalsa20Poly1305.TryDecrypt(ciphertext, _key, _nonce);
TestHelpers.AssertEqualBytes(plaintextExpected, plaintextActual);
}
}
public void RoundTripSuccessWithManyLengthsSegments()
{
for (int length = 0; length < 1000; length++)
{
var plaintextExpected = Enumerable.Range(0, length).Select(i => (byte)i).ToArray();
var ciphertext = new byte[plaintextExpected.Length + XSalsa20Poly1305.MacSizeInBytes].Pad();
var plaintextActual = new byte[plaintextExpected.Length].Pad();
XSalsa20Poly1305.Encrypt(ciphertext, plaintextExpected.ToArray().Pad(), _key.Pad(), _nonce.Pad());
ciphertext.UnPad();//verify padding
XSalsa20Poly1305.TryDecrypt(plaintextActual, ciphertext, _key.Pad(), _nonce.Pad());
TestHelpers.AssertEqualBytes(plaintextExpected, plaintextActual.UnPad());
}
}
public void RoundTripFailWithManyLengths()
{
for (int length = 0; length < 130; length++)//130 bytes exceeds two blocks
{
var originalPlaintext = Enumerable.Range(0, length).Select(i => (byte)i).ToArray();
var ciphertext = XSalsa20Poly1305.Encrypt(originalPlaintext.ToArray(), _key, _nonce);
foreach (var brokenCiphertext in ciphertext.WithChangedBit())
{
var plaintextActual = XSalsa20Poly1305.TryDecrypt(brokenCiphertext, _key, _nonce);
Assert.AreEqual(null, plaintextActual);
}
}
}
public void DecryptFailSegments()
{
foreach (var brokenCiphertext in _ciphertext.WithChangedBit())
{
var plaintextActual = new byte[_ciphertext.Length - XSalsa20Poly1305.MacSizeInBytes].Pad();
for (int i = 0; i < plaintextActual.Count; i++)
{
plaintextActual.Array[plaintextActual.Offset + i] = 0x37;
}
var success = XSalsa20Poly1305.TryDecrypt(plaintextActual, brokenCiphertext.Pad(), _key.Pad(), _nonce.Pad());
Assert.IsFalse(success);
TestHelpers.AssertEqualBytes(new byte[_plaintext.Length], plaintextActual.UnPad());
}
}
public string DecryptData(byte[] decryptionKey, EncryptedChannelData encryptedData)
{
string decryptedText = null;
byte[] cipher = null;
byte[] nonce = null;
if (encryptedData != null)
{
if (encryptedData.ciphertext != null)
{
cipher = Convert.FromBase64String(encryptedData.ciphertext);
}
if (encryptedData.nonce != null)
{
nonce = Convert.FromBase64String(encryptedData.nonce);
}
}
if (cipher != null && nonce != null)
{
using (XSalsa20Poly1305 secretBox = new XSalsa20Poly1305(decryptionKey))
{
byte[] decryptedBytes = new byte[cipher.Length - XSalsa20Poly1305.TagLength];
if (secretBox.TryDecrypt(decryptedBytes, cipher, nonce))
{
decryptedText = Encoding.UTF8.GetString(decryptedBytes);
}
else
{
throw new ChannelDecryptionException("Decryption failed for channel.");
}
}
}
else
{
throw new ChannelDecryptionException("Insufficient data received; requires encrypted data with 'ciphertext' and 'nonce'.");
}
return(decryptedText);
}
public void TestPerformanceSmallPayload()
{
var firstkey = new byte[]
{
0x1b, 0x27, 0x55, 0x64, 0x73, 0xe9, 0x85,
0xd4, 0x62, 0xcd, 0x51, 0x19, 0x7a, 0x9a,
0x46, 0xc7, 0x60, 0x09, 0x54, 0x9e, 0xac,
0x64, 0x74, 0xf2, 0x06, 0xc4, 0xee, 0x08,
0x44, 0xf6, 0x83, 0x89
};
var nonce = new byte[]
{
0x69, 0x69, 0x6e, 0xe9, 0x55, 0xb6,
0x2b, 0x73, 0xcd, 0x62, 0xbd, 0xa8,
0x75, 0xfc, 0x73, 0xd6, 0x82, 0x19,
0xe0, 0x03, 0x6b, 0x7a, 0x0b, 0x37
};
var message = new byte[128];
message[0] = 1;
var message2 = new byte[message.Length];
var cipher = new byte[message.Length + XSalsa20Poly1305.TagLength];
var xSalsa20Poly1305 = new XSalsa20Poly1305(firstkey);
var sw = Stopwatch.StartNew();
int counter = 0;
do
{
xSalsa20Poly1305.Encrypt(cipher, message, nonce);
xSalsa20Poly1305.TryDecrypt(message2, cipher, nonce);
counter++;
} while (sw.ElapsedMilliseconds < 10000);
Console.WriteLine("iterations " + counter);
}
public void TestPerformance()
{
var firstkey = new byte[]
{
0x1b, 0x27, 0x55, 0x64, 0x73, 0xe9, 0x85,
0xd4, 0x62, 0xcd, 0x51, 0x19, 0x7a, 0x9a,
0x46, 0xc7, 0x60, 0x09, 0x54, 0x9e, 0xac,
0x64, 0x74, 0xf2, 0x06, 0xc4, 0xee, 0x08,
0x44, 0xf6, 0x83, 0x89
};
var nonce = new byte[]
{
0x69, 0x69, 0x6e, 0xe9, 0x55, 0xb6,
0x2b, 0x73, 0xcd, 0x62, 0xbd, 0xa8,
0x75, 0xfc, 0x73, 0xd6, 0x82, 0x19,
0xe0, 0x03, 0x6b, 0x7a, 0x0b, 0x37
};
var message = new byte[1000000];
message[0] = 1;
var message2 = new byte[message.Length];
var cipher = new byte[message.Length + XSalsa20Poly1305.TagLength];
var xSalsa20Poly1305 = new XSalsa20Poly1305(firstkey);
var sw = Stopwatch.StartNew();
for (int i = 0; i < 100; i++)
{
xSalsa20Poly1305.Encrypt(cipher, message, nonce);
xSalsa20Poly1305.TryDecrypt(message2, cipher, nonce);
}
Console.WriteLine("Encrypt + Decrypt took " + sw.ElapsedMilliseconds);
Assert.AreEqual(message, message2);
}
public void Test1()
{
var firstkey = new byte[]
{
0x1b, 0x27, 0x55, 0x64, 0x73, 0xe9, 0x85,
0xd4, 0x62, 0xcd, 0x51, 0x19, 0x7a, 0x9a,
0x46, 0xc7, 0x60, 0x09, 0x54, 0x9e, 0xac,
0x64, 0x74, 0xf2, 0x06, 0xc4, 0xee, 0x08,
0x44, 0xf6, 0x83, 0x89
};
var nonce = new byte[]
{
0x69, 0x69, 0x6e, 0xe9, 0x55, 0xb6,
0x2b, 0x73, 0xcd, 0x62, 0xbd, 0xa8,
0x75, 0xfc, 0x73, 0xd6, 0x82, 0x19,
0xe0, 0x03, 0x6b, 0x7a, 0x0b, 0x37
};
var message = new byte[]
{
0xbe, 0x07, 0x5f, 0xc5, 0x3c, 0x81, 0xf2, 0xd5, 0xcf, 0x14, 0x13, 0x16,
0xeb, 0xeb, 0x0c, 0x7b, 0x52, 0x28, 0xc5, 0x2a, 0x4c, 0x62, 0xcb, 0xd4,
0x4b, 0x66, 0x84, 0x9b, 0x64, 0x24, 0x4f, 0xfc, 0xe5, 0xec, 0xba, 0xaf,
0x33, 0xbd, 0x75, 0x1a, 0x1a, 0xc7, 0x28, 0xd4, 0x5e, 0x6c, 0x61, 0x29,
0x6c, 0xdc, 0x3c, 0x01, 0x23, 0x35, 0x61, 0xf4, 0x1d, 0xb6, 0x6c, 0xce,
0x31, 0x4a, 0xdb, 0x31, 0x0e, 0x3b, 0xe8, 0x25, 0x0c, 0x46, 0xf0, 0x6d,
0xce, 0xea, 0x3a, 0x7f, 0xa1, 0x34, 0x80, 0x57, 0xe2, 0xf6, 0x55, 0x6a,
0xd6, 0xb1, 0x31, 0x8a, 0x02, 0x4a, 0x83, 0x8f, 0x21, 0xaf, 0x1f, 0xde,
0x04, 0x89, 0x77, 0xeb, 0x48, 0xf5, 0x9f, 0xfd, 0x49, 0x24, 0xca, 0x1c,
0x60, 0x90, 0x2e, 0x52, 0xf0, 0xa0, 0x89, 0xbc, 0x76, 0x89, 0x70, 0x40,
0xe0, 0x82, 0xf9, 0x37, 0x76, 0x38, 0x48, 0x64, 0x5e, 0x07, 0x05
};
var expected = new byte[]
{
0xf3, 0xff, 0xc7, 0x70, 0x3f, 0x94, 0x00, 0xe5, 0x2a, 0x7d, 0xfb, 0x4b, 0x3d, 0x33, 0x05, 0xd9, 0x8e,
0x99, 0x3b, 0x9f, 0x48, 0x68, 0x12, 0x73, 0xc2, 0x96, 0x50, 0xba, 0x32, 0xfc, 0x76, 0xce, 0x48, 0x33,
0x2e, 0xa7, 0x16, 0x4d, 0x96, 0xa4, 0x47, 0x6f, 0xb8, 0xc5, 0x31, 0xa1, 0x18, 0x6a, 0xc0, 0xdf, 0xc1,
0x7c, 0x98, 0xdc, 0xe8, 0x7b, 0x4d, 0xa7, 0xf0, 0x11, 0xec, 0x48, 0xc9, 0x72, 0x71, 0xd2, 0xc2, 0x0f,
0x9b, 0x92, 0x8f, 0xe2, 0x27, 0x0d, 0x6f, 0xb8, 0x63, 0xd5, 0x17, 0x38, 0xb4, 0x8e, 0xee, 0xe3, 0x14,
0xa7, 0xcc, 0x8a, 0xb9, 0x32, 0x16, 0x45, 0x48, 0xe5, 0x26, 0xae, 0x90, 0x22, 0x43, 0x68, 0x51, 0x7a,
0xcf, 0xea, 0xbd, 0x6b, 0xb3, 0x73, 0x2b, 0xc0, 0xe9, 0xda, 0x99, 0x83, 0x2b, 0x61, 0xca, 0x01, 0xb6,
0xde, 0x56, 0x24, 0x4a, 0x9e, 0x88, 0xd5, 0xf9, 0xb3, 0x79, 0x73, 0xf6, 0x22, 0xa4, 0x3d, 0x14, 0xa6,
0x59, 0x9b, 0x1f, 0x65, 0x4c, 0xb4, 0x5a, 0x74, 0xe3, 0x55, 0xa5
};
var cipher = new byte[message.Length + XSalsa20Poly1305.TagLength];
XSalsa20Poly1305 xSalsa20Poly1305 = new XSalsa20Poly1305(firstkey);
xSalsa20Poly1305.Encrypt(cipher, message, nonce);
Assert.AreEqual(expected, cipher);
var message2 = new byte[message.Length];
var result = xSalsa20Poly1305.TryDecrypt(message2, cipher, nonce);
Assert.AreEqual(message, message2);
Assert.IsTrue(result);
}
public static byte[] DecryptSymmetric(byte[] message, byte[] nonce, byte[] sharedKey)
{
return(XSalsa20Poly1305.TryDecrypt(message, sharedKey, nonce));
}
public byte[] Decrypt(byte[] ciphertext, byte[] key, byte[] nonce)
{
return(XSalsa20Poly1305.TryDecrypt(ciphertext, key, nonce));
}
public (byte[] ciphertext, byte[] nonce) Encrypt(byte[] plaintext, byte[] key, byte[] nonce = default)
{
nonce ??= PrivateKey.GetSecureRandomeBytes(XSalsa20Poly1305.NonceSizeInBytes);
return(XSalsa20Poly1305.Encrypt(plaintext, key, nonce), nonce);
}
public static long EncryptFile(System.IO.FileInfo SourceFile, FileStream DestinationFile, string[] Recipients, Keys SenderKeys)
{
// crypto variables
// THESE SHOULD BE RANDOM!
byte[] fileNonce = Utilities.GenerateRandomBytes(16);
byte[] fileKey = Utilities.GenerateRandomBytes(32);
Keys ephemeral = new Keys(true);
// these are dependant on recipients
byte[] sharedKey = null;
// validate parameters
//process chunks
Blake2sCSharp.Hasher b2s = Blake2sCSharp.Blake2S.Create();
UTF8Encoding utf8 = new UTF8Encoding();
// use cache file instead of a memory stream to conserve used memory MemoryStream ms = new MemoryStream(); // processed chunks go here
string tempFile = null;
FileStream cacheFs = GetTempFileStream(out tempFile);
FileStream fs = new FileStream(SourceFile.FullName, FileMode.Open, FileAccess.Read);
long fileCursor = 0;
byte[] chunk = null;
UInt64 chunkCount = 0;
byte[] chunkNonce = new byte[24]; // always a constant length
// this part of the nonce doesn't change
Array.Copy(fileNonce, chunkNonce, fileNonce.Length); // copy it once and be done with it
do
{
if (chunkCount == 0) // first chunk is always '\0'-padded filename
{
chunk = new byte[256];
byte[] filename = utf8.GetBytes(SourceFile.Name);
Array.Copy(filename, chunk, filename.Length);
filename.Wipe(); // DON'T LEAK!!!
}
else
{
if (fileCursor + MAX_CHUNK_SIZE >= SourceFile.Length)
{
// last chunk
chunkNonce[23] |= 0x80;
chunk = new byte[SourceFile.Length - fileCursor];
}
else
{
chunk = new byte[MAX_CHUNK_SIZE];
}
if (fs.Read(chunk, 0, chunk.Length) != chunk.Length)
{
// read error!
fs.Close();
fs.Dispose();
TrashTempFileStream(cacheFs, tempFile);
throw new System.IO.IOException("Abrupt end of file / read error from source.");
}
fileCursor += chunk.Length;
}
byte[] outBuffer = XSalsa20Poly1305.Encrypt(chunk, fileKey, chunkNonce);
byte[] chunkLengthBytes = Utilities.UInt32ToBytes((uint)chunk.Length);
cacheFs.Write(chunkLengthBytes, 0, 4); // use cache file
b2s.Update(chunkLengthBytes); // hash as we go
cacheFs.Write(outBuffer, 0, outBuffer.Length); // use cache file
b2s.Update(outBuffer); // hash as we go
// since the first chunkNonce is just the fileNonce and a bunch of 0x00's,
// it's safe to do the chunk counter as a post-process update
Utilities.UInt64ToBytes(++chunkCount, chunkNonce, 16);
} while (fileCursor < SourceFile.Length);
cacheFs.Flush(true); // make sure everything is flushed to the disk cache
cacheFs.Position = 0; // leave it open so that we can read it back into the destination
// get the ciphertext hash for the header
byte[] cipherTextHash = b2s.Finish();
// done encrypting to the cache, now to build the header
//build header (fileInfo needed first, but same for all recipients)...
FileInfo fi = new FileInfo(
fileKey.ToBase64String(),
fileNonce.ToBase64String(),
cipherTextHash.ToBase64String());
byte[] fiBytes = utf8.GetBytes(fi.ToJSON()); // encrypt this to the recipients next...
//build inner headers next (one for each recipient)
Dictionary <string, string> innerHeaders = new Dictionary <string, string>(Recipients.Length);
foreach (string recip in Recipients)
{
// each recipient is not identified in the outer header, only a random NONCE
byte[] recipientNonce = Utilities.GenerateRandomBytes(24);
sharedKey = // INNER SHARED KEY (Sender Secret + Recipient Public)
SenderKeys.GetShared(recip);
InnerHeaderInfo ih = new InnerHeaderInfo(
SenderKeys.PublicID,
recip,
XSalsa20Poly1305.Encrypt(fiBytes, sharedKey, recipientNonce).ToBase64String()); // fileInfo JSON object encrypted, Base64
sharedKey = // OUTER SHARED KEY (Ephemeral Secret + Recipient Public)
ephemeral.GetShared(recip);
string encryptedInnerHeader = ih.ToJSON();
encryptedInnerHeader = XSalsa20Poly1305.Encrypt(utf8.GetBytes(encryptedInnerHeader), sharedKey, recipientNonce).ToBase64String();
innerHeaders.Add(recipientNonce.ToBase64String(), encryptedInnerHeader);
}
// finally the outer header, ready for stuffing into the file
HeaderInfo hi = new HeaderInfo(1, ephemeral.PublicKey.ToBase64String(), innerHeaders);
string fileHeader = hi.ToJSON();
// build the final file...
DestinationFile.Write(utf8.GetBytes("miniLock"), 0, 8); // file identifier (aka "magic bytes")
DestinationFile.Write(Utilities.UInt32ToBytes((uint)fileHeader.Length), 0, 4); // header length in 4 little endian bytes
DestinationFile.Write(utf8.GetBytes(fileHeader), 0, fileHeader.Length); // the full JSON header object
// read back from the cache file into the destination file...
byte[] buffer;
for (int i = 0; i < cacheFs.Length; i += buffer.Length)
{
if (i + MAX_CHUNK_SIZE >= cacheFs.Length)
{
buffer = new byte[cacheFs.Length - i];
}
else
{
buffer = new byte[MAX_CHUNK_SIZE];
}
if (cacheFs.Read(buffer, 0, buffer.Length) != buffer.Length)
{
throw new System.IO.IOException("Abrupt end of cache file");
}
DestinationFile.Write(buffer, 0, buffer.Length); // the ciphertext
}
// now flush and close, and grab length for reporting to caller
DestinationFile.Flush();
long tempOutputFileLength = DestinationFile.Length;
DestinationFile.Close();
DestinationFile.Dispose();
// kill the cache and the directory created for it
TrashTempFileStream(cacheFs, tempFile);
return(tempOutputFileLength);
}
public static void Main()
{
const int n = 10000;
Thread.CurrentThread.CurrentCulture = CultureInfo.InvariantCulture;
Console.WriteLine("Architecture: {0} bit", IntPtr.Size * 8);
Console.WriteLine("CPU-Frequency: {0} MHz", Cpu.CpuFreq);
Cpu.Setup();
Console.WriteLine();
Console.ReadKey();
var m = new byte[100];
var seed = new byte[32];
byte[] privateKey;
byte[] publicKey;
Ed25519.KeyPairFromSeed(out publicKey, out privateKey, seed);
var sig = Ed25519.Sign(m, privateKey);
Ed25519.Sign(m, privateKey);
if (!Ed25519.Verify(sig, m, publicKey))
{
throw new Exception("Bug");
}
if (Ed25519.Verify(sig, m.Concat(new byte[] { 1 }).ToArray(), publicKey))
{
throw new Exception("Bug");
}
Console.BackgroundColor = ConsoleColor.Black;
{
Console.ForegroundColor = ConsoleColor.Yellow;
Console.WriteLine("=== Edwards ===");
Benchmark("KeyGen", () => Ed25519.KeyPairFromSeed(out publicKey, out privateKey, seed), n);
Benchmark("Sign", () => Ed25519.Sign(m, privateKey), n);
Benchmark("Verify", () => Ed25519.Verify(sig, m, publicKey), n);
Benchmark("KeyExchange", () => Ed25519.KeyExchange(publicKey, privateKey), n);
Console.WriteLine();
}
{
Console.ForegroundColor = ConsoleColor.Yellow;
Console.WriteLine("=== Montgomery ===");
Benchmark("KeyGen", () => MontgomeryCurve25519.GetPublicKey(seed), n);
Benchmark("KeyExchange", () => MontgomeryCurve25519.KeyExchange(publicKey, seed), n);
Console.WriteLine();
}
foreach (var size in new[] { 1, 128 * 1024 })
{
Console.ForegroundColor = ConsoleColor.Yellow;
Console.WriteLine("=== Symmetric ({0}) ===", SizeToString(size));
var message = new byte[size];
var ciphertext = new byte[message.Length + 16];
var key = new byte[32];
var nonce = new byte[24];
Benchmark("HSalsa20Core", () => HSalsa20Core(size), n, size);
Benchmark("XSalsa20Poly1305 Encrypt", () => XSalsa20Poly1305.Encrypt(new ArraySegment <byte>(ciphertext), new ArraySegment <byte>(message), new ArraySegment <byte>(key), new ArraySegment <byte>(nonce)), n, size);
Benchmark("SHA512Managed", () => new SHA512Managed().ComputeHash(message), n, size);
Benchmark("SHA512Cng", () => new SHA512Cng().ComputeHash(message), n, size);
Benchmark("SHA512CSP", () => new SHA512CryptoServiceProvider().ComputeHash(message), n, size);
Benchmark("SHA512Chaos", () => Sha512.Hash(message), n, size);
}
}
public void DecryptSuccess()
{
var plaintextActual = XSalsa20Poly1305.TryDecrypt(_ciphertext, _key, _nonce);
TestHelpers.AssertEqualBytes(_plaintext, plaintextActual);
}
/// <summary>
/// Decrypt a miniLock file using the specified Keys
/// </summary>
/// <param name="TheFile"></param>
/// <param name="RecipientKeys"></param>
/// <returns>null on any error, or a DecryptedFile object with the raw file contents, a plaintext hash,
/// the SenderID, and the stored filename</returns>
public static DecryptedFileDetails DecryptFile(FileStream SourceFile, string DestinationFileFullPath, bool OverWriteDestination, miniLockManaged.Keys RecipientKeys)
{
if (SourceFile == null)
{
throw new ArgumentNullException("SourceFile");
}
if (DestinationFileFullPath == null)
{
throw new ArgumentNullException("DestinationFile");
}
if (!SourceFile.CanRead)
{
throw new InvalidOperationException("Source File not readable!");
}
if (System.IO.File.Exists(DestinationFileFullPath) && !OverWriteDestination)
{
// be fault tolerant
System.IO.FileInfo existing = new System.IO.FileInfo(DestinationFileFullPath);
string newFilename = DestinationFileFullPath;
int counter = 1;
do
{
newFilename = DestinationFileFullPath.Replace(existing.Extension, "");
newFilename += '(' + counter++.ToString() + ')' + existing.Extension;
} while (File.Exists(newFilename));
DestinationFileFullPath = newFilename;
// this is not fault tolerant
//throw new InvalidOperationException("Destination File already exists! Set OverWriteDestination true or choose a different filename.");
}
FullHeader fileStuff = new FullHeader();
HeaderInfo h;
byte[] buffer = null;
// after this call, the source file pointer should be positioned to the end of the header
int hLen = IngestHeader(ref SourceFile, out h);
if (hLen < 0)
{
SourceFile.Close();
SourceFile.Dispose();
return(null);
}
hLen += 12; // the 8 magic bytes and the 4 header length bytes and the length of the JSON header object
long theCliff = SourceFile.Length - hLen; // this is the ADJUSTED point where the file cursor falls off the cliff
if (!TryDecryptHeader(h, RecipientKeys, out fileStuff)) // ciphertext hash is compared later
{
fileStuff.Clear();
SourceFile.Close();
SourceFile.Dispose();
return(null);
}
Blake2sCSharp.Hasher b2sPlain = Blake2sCSharp.Blake2S.Create(); // a nice-to-have for the user
Blake2sCSharp.Hasher b2sCipher = Blake2sCSharp.Blake2S.Create(); // a check to make sure the ciphertext wasn't altered
//note: in theory, if the ciphertext doesn't decrypt at any point, there is likely something wrong with it up to and
// including truncation/extension
// BUT the hash is included in the header, and should be checked.
DecryptedFileDetails results = new DecryptedFileDetails();
results.ActualDecryptedFilePath = DestinationFileFullPath; // if the filename got changed, it happened before this point
string tempFile = null; // save the filename of the temp file so that the temp directory created with it is also killed
System.IO.FileStream tempFS = GetTempFileStream(out tempFile);
int cursor = 0;
UInt64 chunkNumber = 0;
byte[] chunkNonce = new byte[24]; // always a constant length
Array.Copy(fileStuff.fileNonce, chunkNonce, fileStuff.fileNonce.Length); // copy it once and be done with it
do
{
// how big is this chunk? (32bit number, little endien)
buffer = new byte[4];
if (SourceFile.Read(buffer, 0, buffer.Length) != buffer.Length)
{
//read error
fileStuff.Clear();
SourceFile.Close();
SourceFile.Dispose();
TrashTempFileStream(tempFS, tempFile);
return(null);
}
b2sCipher.Update(buffer); // have to include ALL the bytes, even the chunk-length bytes
UInt32 chunkLength = Utilities.BytesToUInt32(buffer);
if (chunkLength > MAX_CHUNK_SIZE)
{
//something went wrong!
fileStuff.Clear();
SourceFile.Close();
SourceFile.Dispose();
TrashTempFileStream(tempFS, tempFile);
return(null);
}
cursor += 4; // move past the chunk length
//the XSalsa20Poly1305 process, ALWAYS expands the plaintext by MacSizeInBytes
// (authentication), so read the plaintext chunk length, add those bytes to the
// value, then read that many bytes out of the ciphertext buffer
byte[] chunk = new byte[chunkLength + XSalsa20Poly1305.MacSizeInBytes];
//Array.Copy(buffer, cursor,
// chunk, 0,
// chunk.Length);
if (SourceFile.Read(chunk, 0, chunk.Length) != chunk.Length)
{
//read error
fileStuff.Clear();
SourceFile.Close();
SourceFile.Dispose();
TrashTempFileStream(tempFS, tempFile);
return(null);
}
b2sCipher.Update(chunk); // get hash of cipher text to compare to stored File Info Object
cursor += chunk.Length; // move the cursor past this chunk
if (cursor >= theCliff) // this is the last chunk
{
// set most significant bit of nonce
chunkNonce[23] |= 0x80;
}
byte[] decryptBytes = XSalsa20Poly1305.TryDecrypt(chunk, fileStuff.fileKey, chunkNonce);
if (decryptBytes == null)
{
// nonce or key incorrect, or chunk has been altered (truncated?)
buffer = null;
fileStuff.Clear();
SourceFile.Close();
SourceFile.Dispose();
TrashTempFileStream(tempFS, tempFile);
return(null);
}
if (chunkNumber == 0) // first chunk is always filename '\0' padded
{
results.StoredFilename = new UTF8Encoding().GetString(decryptBytes).Replace("\0", "").Trim();
}
else
{
b2sPlain.Update(decryptBytes); // give the user a nice PlainText hash
tempFS.Write(decryptBytes, 0, decryptBytes.Length); // start building the output file
}
decryptBytes.Wipe(); // DON'T LEAK!!!
// since the first chunkNonce is just the fileNonce and a bunch of 0x00's,
// it's safe to do the chunk number update as a post-process operation
Utilities.UInt64ToBytes(++chunkNumber, chunkNonce, 16);
} while (cursor < theCliff);
SourceFile.Close();
SourceFile.Dispose();
byte[] ctActualHash = b2sCipher.Finish();
if (!CryptoBytes.ConstantTimeEquals(ctActualHash, fileStuff.ciphertextHash))
{
// ciphertext was altered
TrashTempFileStream(tempFS, tempFile);
return(null);
}
results.SenderID = Keys.GetPublicIDFromKeyBytes(fileStuff.senderID);
fileStuff.Clear(); // wipe the sensitive stuff!
tempFS.Flush();
tempFS.Close();
tempFS.Dispose();
//produce a handy hash for use by the end-user (not part of the spec)
results.PlainTextBlake2sHash = b2sPlain.Finish().ToBase64String();
System.IO.File.Move(tempFile, DestinationFileFullPath);
// WARNING: only use if the method that created the temp file also created a random subdir!
Directory.Delete(new System.IO.FileInfo(tempFile).DirectoryName, true); // this is done since we didn't use TrashTempfileStream
return(results);
}
public void DecryptTooShort()
{
var plaintextActual = XSalsa20Poly1305.TryDecrypt(new byte[15], _key, _nonce);
Assert.AreEqual(null, plaintextActual);
}
PushMsgResult ProcessInitiate(ref Msg msg)
{
if (!CheckBasicCommandStructure(ref msg))
{
return(PushMsgResult.Error);
}
Span <byte> initiate = msg;
if (!IsCommand("INITIATE", ref msg))
{
return(PushMsgResult.Error);
}
if (initiate.Length < 257)
{
return(PushMsgResult.Error);
}
Span <byte> cookieNonce = stackalloc byte[Curve25519XSalsa20Poly1305.NonceLength];
Span <byte> cookiePlaintext = stackalloc byte[64];
Span <byte> cookieBox = initiate.Slice(25, 80);
CookieNoncePrefix.CopyTo(cookieNonce);
initiate.Slice(9, 16).CopyTo(cookieNonce.Slice(8));
using var secretBox = new XSalsa20Poly1305(m_cookieKey);
bool decrypted = secretBox.TryDecrypt(cookiePlaintext, cookieBox, cookieNonce);
if (!decrypted)
{
return(PushMsgResult.Error);
}
// Check cookie plain text is as expected [C' + s']
if (!SpanUtility.Equals(m_cnClientKey, cookiePlaintext.Slice(0, 32)) ||
!SpanUtility.Equals(m_cnSecretKey, cookiePlaintext.Slice(32, 32)))
{
return(PushMsgResult.Error);
}
Span <byte> initiateNonce = stackalloc byte[Curve25519XSalsa20Poly1305.NonceLength];
byte[] initiatePlaintext = new byte[msg.Size - 113];
var initiateBox = initiate.Slice(113);
InitiatieNoncePrefix.CopyTo(initiateNonce);
initiate.Slice(105, 8).CopyTo(initiateNonce.Slice(16));
m_peerNonce = NetworkOrderBitsConverter.ToUInt64(initiate, 105);
using var box = new Curve25519XSalsa20Poly1305(m_cnSecretKey, m_cnClientKey);
bool decrypt = box.TryDecrypt(initiatePlaintext, initiateBox, initiateNonce);
if (!decrypt)
{
return(PushMsgResult.Error);
}
Span <byte> vouchNonce = stackalloc byte[Curve25519XSalsa20Poly1305.NonceLength];
Span <byte> vouchPlaintext = stackalloc byte[64];
Span <byte> vouchBox = new Span <byte>(initiatePlaintext, 48, 80);
var clientKey = new Span <byte>(initiatePlaintext, 0, 32);
VouchNoncePrefix.CopyTo(vouchNonce);
new Span <byte>(initiatePlaintext, 32, 16).CopyTo(vouchNonce.Slice(8));
using var box2 = new Curve25519XSalsa20Poly1305(m_cnSecretKey, clientKey);
decrypt = box2.TryDecrypt(vouchPlaintext, vouchBox, vouchNonce);
if (!decrypt)
{
return(PushMsgResult.Error);
}
// What we decrypted must be the client's short-term public key
if (!SpanUtility.Equals(vouchPlaintext.Slice(0, 32), m_cnClientKey))
{
return(PushMsgResult.Error);
}
// Create the session box
m_box = new Curve25519XSalsa20Poly1305(m_cnSecretKey, m_cnClientKey);
// This supports the Stonehouse pattern (encryption without authentication).
m_state = State.SendingReady;
if (!ParseMetadata(new Span <byte>(initiatePlaintext, 128, initiatePlaintext.Length - 128 - 16)))
{
return(PushMsgResult.Error);
}
vouchPlaintext.Clear();
Array.Clear(initiatePlaintext, 0, initiatePlaintext.Length);
return(PushMsgResult.Ok);
}
public void Encrypt()
{
var ciphertextActual = XSalsa20Poly1305.Encrypt(_plaintext, _key, _nonce);
TestHelpers.AssertEqualBytes(_ciphertext, ciphertextActual);
}
