public void BufferedStream()
{
using (var encryptionStream = new XChaChaBufferedStream(Stream.Null, this.key, EncryptionMode.Encrypt))
{
encryptionStream.Write(data);
}
}
public void Test_Decrypt_DecryptsLargeBlock(int bufferLength)
{
using (var ciphertextStream = new MemoryStream())
using (var key = XChaChaKey.Generate())
{
var plaintext = RandomBytesGenerator.NextBytes(1024 * 1024);
using (var encryptionStream =
new XChaChaBufferedStream(ciphertextStream, key, EncryptionMode.Encrypt, bufferLength, leaveOpen: true))
{
encryptionStream.Write(plaintext);
}
ciphertextStream.Position = 0;
using (var decryptionStream =
new XChaChaBufferedStream(ciphertextStream, key, EncryptionMode.Decrypt, bufferLength))
{
var decryptedPlainText = new byte[plaintext.Length];
var numberOfBytesOutput = decryptionStream.Read(decryptedPlainText);
Assert.Equal(plaintext.Length, numberOfBytesOutput);
Assert.Equal(plaintext.ToArray(), decryptedPlainText);
}
}
}
public void Test_Decrypt_UsingCompressionStream_DecryptsSmallBlock()
{
using (var ciphertextStream = new MemoryStream())
using (var key = XChaChaKey.Generate())
{
var plaintext = TestConstants.MessageBytes;
using (var encryptionStream =
new XChaChaBufferedStream(ciphertextStream, key, EncryptionMode.Encrypt, leaveOpen: true))
{
using (var compressionStream = new BrotliStream(encryptionStream, CompressionMode.Compress))
{
compressionStream.Write(plaintext);
}
}
ciphertextStream.Position = 0;
using (var decryptionStream = new XChaChaBufferedStream(ciphertextStream, key, EncryptionMode.Decrypt))
{
using (var decompressionStream = new BrotliStream(decryptionStream, CompressionMode.Decompress))
{
var decryptedPlainText = new byte[plaintext.Length];
var numberOfBytesOutput = decompressionStream.Read(decryptedPlainText);
Assert.Equal(plaintext.Length, numberOfBytesOutput);
Assert.Equal(plaintext, decryptedPlainText);
}
}
}
}
public void Test_Decrypt_OverReadDecryptionStream_OutputsCorrectNumberOfBytes()
{
using (var ciphertextStream = new MemoryStream())
using (var key = XChaChaKey.Generate())
{
var plaintext = TestConstants.MessageBytes;
using (var encryptionStream =
new XChaChaBufferedStream(ciphertextStream, key, EncryptionMode.Encrypt, leaveOpen: true))
{
encryptionStream.Write(plaintext);
}
ciphertextStream.Position = 0;
using (var decryptionStream = new XChaChaBufferedStream(ciphertextStream, key, EncryptionMode.Decrypt))
{
var decryptedPlainText = new byte[plaintext.Length * 2];
var numberOfBytesOutput = decryptionStream.Read(decryptedPlainText);
Assert.Equal(plaintext.Length, numberOfBytesOutput);
Assert.Equal(plaintext, decryptedPlainText.Take(plaintext.Length));
}
}
}
public void Test_Decrypt_MultipleSmallBlocks()
{
using (var ciphertextStream = new MemoryStream())
using (var key = XChaChaKey.Generate())
{
var plaintext1 = RandomBytesGenerator.NextBytes(17);
var plaintext2 = RandomBytesGenerator.NextBytes(23);
using (var encryptionStream =
new XChaChaBufferedStream(ciphertextStream, key, EncryptionMode.Encrypt, leaveOpen: true))
{
encryptionStream.Write(plaintext1);
encryptionStream.Write(plaintext2);
}
ciphertextStream.Position = 0;
using (var decryptionStream = new XChaChaBufferedStream(ciphertextStream, key, EncryptionMode.Decrypt))
{
var plaintextLength = plaintext1.Length + plaintext2.Length;
var decryptedPlainText = new byte[plaintextLength];
var numberOfBytesOutput = decryptionStream.Read(decryptedPlainText);
Assert.Equal(plaintextLength, numberOfBytesOutput);
Assert.Equal(plaintext1.Concat(plaintext2), decryptedPlainText);
}
}
}
public void Test_Encrypt_WriteDifferentAmountsToStream(int bufferLength)
{
var plaintext1 = RandomBytesGenerator.NextBytes(157 * 1024);
var plaintext2 = RandomBytesGenerator.NextBytes(314 * 1024);
var plaintext3 = RandomBytesGenerator.NextBytes(273 * 1024);
var totalPlainTextLength = plaintext1.Length + plaintext2.Length + plaintext3.Length;
var numberOfBlocks = Math.Ceiling((decimal)totalPlainTextLength / bufferLength);
var expectedOutputLength = StreamHeaderLength + totalPlainTextLength + (numberOfBlocks * StreamABytes);
using (var outputStream = new MemoryStream())
{
using (var key = XChaChaKey.Generate())
using (var encryptionStream = new XChaChaBufferedStream(outputStream, key, EncryptionMode.Encrypt, bufferLength))
{
encryptionStream.Write(plaintext1);
encryptionStream.Write(plaintext2);
encryptionStream.Write(plaintext3);
}
var ciphertext = outputStream.ToArray();
Assert.Equal(expectedOutputLength, ciphertext.Length);
}
}
public void BufferedStream()
{
this.bufferedCiphertextStream.Position = 0;
using (var decryptionStream = new XChaChaBufferedStream(
this.bufferedCiphertextStream, this.key, EncryptionMode.Decrypt, leaveOpen: true))
{
decryptionStream.Read(this.bufferedOutput);
}
}
public void Encryption()
{
var bufferLength = this.BufferLengthKb * 1024;
using (var encryptionStream = new XChaChaBufferedStream(
Stream.Null, this.key, EncryptionMode.Encrypt, bufferLength))
{
encryptionStream.Write(data);
}
}
public void GlobalSetup()
{
new Random(31).NextBytes(data);
this.key = XChaChaKey.Generate();
using (var bufferedEncryptionStream = new XChaChaBufferedStream(
this.bufferedCiphertextStream, this.key, EncryptionMode.Encrypt, leaveOpen: true))
{
bufferedEncryptionStream.Write(data);
}
}
public void Test_Flush_FlushesHeader()
{
using (var outputStream = new MemoryStream())
using (var key = XChaChaKey.Generate())
using (var encryptionStream = new XChaChaBufferedStream(outputStream, key, EncryptionMode.Encrypt))
{
var plaintext = Array.Empty <byte>();
encryptionStream.Write(plaintext);
encryptionStream.Flush();
var ciphertext = outputStream.ToArray();
Assert.Equal(StreamHeaderLength, ciphertext.Length);
}
}
public void Test_Encrypt_WithLargeData_ProducesCorrectOutputLength(int bufferLength)
{
var plaintext = RandomBytesGenerator.NextBytes(1024 * 1024);
using (var outputStream = new MemoryStream())
{
using (var key = XChaChaKey.Generate())
using (var encryptionStream = new XChaChaBufferedStream(outputStream, key, EncryptionMode.Encrypt, bufferLength))
{
encryptionStream.Write(plaintext);
}
var ciphertext = outputStream.ToArray();
var numberOfBlocks = Math.Ceiling((decimal)plaintext.Length / bufferLength);
var expectedCipherTextLength = plaintext.Length + StreamHeaderLength + (StreamABytes * numberOfBlocks);
Assert.Equal(expectedCipherTextLength, ciphertext.Length);
}
}
public void Test_Encrypt_ProducesCorrectOutputLength()
{
var plaintext = TestConstants.MessageBytes;
using (var outputStream = new MemoryStream())
{
using (var key = XChaChaKey.Generate())
using (var encryptionStream = new XChaChaBufferedStream(outputStream, key, EncryptionMode.Encrypt))
{
encryptionStream.Write(plaintext);
}
var ciphertext = outputStream.ToArray();
// The encryption stream encrypts in 128KB blocks
const int numberOfBlocks = 1;
var expectedCipherTextLength = plaintext.Length + StreamHeaderLength + (StreamABytes * numberOfBlocks);
Assert.Equal(expectedCipherTextLength, ciphertext.Length);
}
}
public void GlobalSetup()
{
var data = new byte[this.DataLengthKb * 1024];
new Random(31).NextBytes(data);
this.nonBufferedCiphertextStream = new MemoryStream();
this.bufferedCiphertextStream = new MemoryStream();
this.key = XChaChaKey.Generate();
using (var bufferedEncryptionStream = new XChaChaBufferedStream(
this.bufferedCiphertextStream, this.key, EncryptionMode.Encrypt, leaveOpen: true))
{
bufferedEncryptionStream.Write(data);
}
using (var encryptionStream = new XChaChaStream(
this.nonBufferedCiphertextStream, this.key, EncryptionMode.Encrypt, leaveOpen: true))
{
encryptionStream.WriteFinal(data);
}
}
public void Test_Decrypt_VerifyEndOfMessage_TrueWhenFullyDecrypted()
{
using (var ciphertextStream = new MemoryStream())
using (var key = XChaChaKey.Generate())
{
var plaintext = RandomBytesGenerator.NextBytes(1024 * 1024);
using (var encryptionStream =
new XChaChaBufferedStream(ciphertextStream, key, EncryptionMode.Encrypt, leaveOpen: true))
{
encryptionStream.Write(plaintext);
}
ciphertextStream.Position = 0;
using (var decryptionStream = new XChaChaBufferedStream(ciphertextStream, key, EncryptionMode.Decrypt))
{
var decryptedPlainText = new byte[plaintext.Length];
decryptionStream.Read(decryptedPlainText);
Assert.True(decryptionStream.VerifyEndOfMessage());
}
}
}
