public async Task ReadAsync_EmptyStream_EmptyStreamEncrypted()
{
var cryptoStream = new SymmetricEncryptStream(
new MemoryStream(),
new SymmetricEncryptionSettings
{
Key = GenerateKey(256)
});
var result = await cryptoStream.ReadAllAsync();
result.Should().HaveCount(32);
}
public async Task ReadAsync_WithoutSpecifyingIV_IVIsGeneratedAndPrepended()
{
var cryptoStream = new SymmetricEncryptStream(
new MemoryStream(ClearTextMessage),
new SymmetricEncryptionSettings
{
Key = GenerateKey(256)
});
var result = await cryptoStream.ReadAllAsync();
result.Should().NotBeNull();
result !.Length.Should().Be(AesDefaultBlockSizeInBytes + AesDefaultInitializationVectorSizeInBytes);
}
public async Task ReadAsync_UsingDefaultAesAlgorithmWithDefaultSettings_MessageIsSuccessfullyEncrypted()
{
var cryptoStream = new SymmetricEncryptStream(
new MemoryStream(ClearTextMessage),
new SymmetricEncryptionSettings
{
Key = GenerateKey(256)
});
var result = await cryptoStream.ReadAllAsync();
result.Should().NotBeNull();
result !.Length.Should().Be(AesDefaultBlockSizeInBytes + AesDefaultInitializationVectorSizeInBytes);
result.Should().NotBeEquivalentTo(ClearTextMessage);
}
public async Task ReadAsync_SpecifyingIV_IVIsNotPrepended()
{
var iv = GenerateKey(128);
var cryptoStream = new SymmetricEncryptStream(
new MemoryStream(ClearTextMessage),
new SymmetricEncryptionSettings
{
Key = GenerateKey(256),
InitializationVector = iv
});
var result = await cryptoStream.ReadAllAsync();
result.Should().NotBeNull();
result !.Length.Should().Be(AesDefaultBlockSizeInBytes);
result.Take(iv.Length).Should().NotBeEquivalentTo(iv);
}
public async Task ReadAsync_UsingRijndaelWithCustomSettings_MessageIsSuccessfullyEncrypted()
{
var cryptoStream = new SymmetricEncryptStream(
new MemoryStream(ClearTextMessage),
new SymmetricEncryptionSettings
{
AlgorithmName = "Rijndael",
BlockSize = 128,
FeedbackSize = 64,
Key = GenerateKey(128),
CipherMode = CipherMode.ECB,
PaddingMode = PaddingMode.ISO10126
});
var result = await cryptoStream.ReadAllAsync();
result.Should().NotBeNull();
result !.Length.Should().Be((128 * 2) / 8);
result.Should().NotBeEquivalentTo(ClearTextMessage);
}
public async Task ReadAsync_TwiceWithoutSpecifyingIV_ResultIsDifferent()
{
var cryptoStream1 = new SymmetricEncryptStream(
new MemoryStream(ClearTextMessage),
new SymmetricEncryptionSettings
{
Key = GenerateKey(256)
});
var cryptoStream2 = new SymmetricEncryptStream(
new MemoryStream(ClearTextMessage),
new SymmetricEncryptionSettings
{
Key = GenerateKey(256)
});
var result1 = await cryptoStream1.ReadAllAsync();
var result2 = await cryptoStream2.ReadAllAsync();
result2.Should().NotBeEquivalentTo(result1);
}
public async Task ReadAsync_TwiceWithSameIV_ResultIsEqual()
{
var cryptoStream1 = new SymmetricEncryptStream(
new MemoryStream(ClearTextMessage),
new SymmetricEncryptionSettings
{
Key = GenerateKey(256),
InitializationVector = GenerateKey(128)
});
var cryptoStream2 = new SymmetricEncryptStream(
new MemoryStream(ClearTextMessage),
new SymmetricEncryptionSettings
{
Key = GenerateKey(256),
InitializationVector = GenerateKey(128)
});
var result1 = await cryptoStream1.ReadAllAsync();
var result2 = await cryptoStream2.ReadAllAsync();
result2.Should().BeEquivalentTo(result1);
}
public async Task ReadAsync_TwiceWithoutSpecifyingIV_GeneratedIVIsDifferent()
{
var cryptoStream1 = new SymmetricEncryptStream(
new MemoryStream(ClearTextMessage),
new SymmetricEncryptionSettings
{
Key = GenerateKey(256)
});
var cryptoStream2 = new SymmetricEncryptStream(
new MemoryStream(ClearTextMessage),
new SymmetricEncryptionSettings
{
Key = GenerateKey(256)
});
var result1 = await cryptoStream1.ReadAllAsync();
var result2 = await cryptoStream2.ReadAllAsync();
var iv1 = result1 !.Take(AesDefaultInitializationVectorSizeInBytes);
var iv2 = result2 !.Take(AesDefaultInitializationVectorSizeInBytes);
iv2.Should().NotBeEquivalentTo(iv1);
}