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_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 BufferedStream()
{
this.bufferedCiphertextStream.Position = 0;
using (var decryptionStream = new XChaChaBufferedStream(
this.bufferedCiphertextStream, this.key, EncryptionMode.Decrypt, leaveOpen: true))
{
decryptionStream.Read(this.bufferedOutput);
}
}
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());
}
}
}