/// <summary>
/// Updates the string value from previously set SafeString.
/// </summary>
private void UpdateStringValue()
{
if (Memory.SafeString.IsNullOrEmpty(SafeString) || SafeString.IsDisposed)
{
String = "";
return;
}
unsafe
{
String = new string('\0', SafeString.Length);
_gch = new GCHandle();
#if NETFRAMEWORK
// Create a CER (Constrained Execution Region)
RuntimeHelpers.PrepareConstrainedRegions();
#endif
try
{
}
finally
{
// Pin our string, disallowing the garbage collector from moving it around.
_gch = GCHandle.Alloc(String, GCHandleType.Pinned);
}
// Create a CER (Constrained Execution Region)
#if NETFRAMEWORK
RuntimeHelpers.PrepareConstrainedRegions();
#endif
var pInsecureString = (char *)_gch.AddrOfPinnedObject();
for (var charIndex = 0; charIndex < SafeString.Length; charIndex++)
{
pInsecureString[charIndex] = SafeString.GetAsChar(charIndex);
}
}
}
public void IsNullOrEmpty_ForNullSafeStringObject_ReturnsTrue()
{
// Arrange
var nullString = (ISafeString)null;
// Act
var isNull = SafeString.IsNullOrEmpty(nullString);
// Assert
Assert.That(isNull, Is.True);
}
public void IsNullOrEmpty_ForNewSafeStringInstance_ReturnsTrue()
{
// Arrange
var sut = GetSut();
// Act
var isEmpty = SafeString.IsNullOrEmpty(sut);
// Assert
Assert.That(isEmpty, Is.True);
}
public void SafeString_Returns_AppendedText()
{
var expected = "test";
var sut = new SafeString();
sut.Append("t");
sut.Append("es");
sut.Append('t');
using (var sm = new SafeStringToStringMarshaler(sut))
{
var actual = sm.String;
Assert.That(actual, Is.EqualTo(expected));
}
}
public async Task IsNullOrEmpty_ForObjectHoldingSingleByte_ReturnsFalse(
[Random(0, 256, 1)] int i)
{
// Arrange
using var sut = GetSut();
var c = (char)i;
await sut.AppendAsync(c);
// Act
var isEmpty = SafeString.IsNullOrEmpty(sut);
// Assert
Assert.That(isEmpty, Is.False);
}
public async Task IsNullOrEmpty_ForClearedInstance_ReturnsTrue()
{
// Arrange
var sut = GetSut();
await sut.AppendAsync("Hello world");
sut.Clear();
// Act
var isNull = SafeString.IsNullOrEmpty(sut);
// Assert
Assert.That(isNull, Is.True);
}
public async Task SafeString_TextCanBeRevealedTwice()
{
// Arrange
const string expected = "test";
var sut = new SafeString();
await sut.AppendAsync(expected);
// Act
var revealed = await RevealAsync(sut);
var revealedAgain = await RevealAsync(sut);
// Assert
Assert.AreEqual(expected, revealed);
Assert.AreEqual(expected, revealedAgain);
public async Task IsNullOrEmpty_ForDisposedSafeBytesObject_ReturnsTrue(
[Random(0, 256, 1)] int i)
{
// Arrange
var sut = GetSut();
var c = (char)i;
await sut.AppendAsync(c);
sut.Dispose();
// Act
var isNull = SafeString.IsNullOrEmpty(sut);
// Assert
Assert.That(isNull, Is.True);
}
public async Task EqualsAsync_TwoStringsWithDifferentLength_ReturnsFalse()
{
// Arrange
var sut1 = new SafeString();
await sut1.AppendAsync("hej");
var sut2 = new SafeString();
await sut2.AppendAsync("sp");
// Act
var equality = await sut1.EqualsAsync(sut2);
var equalityOpposite = await sut2.EqualsAsync(sut1);
// Assert
Assert.False(equality);
Assert.False(equalityOpposite);
}
public async Task SafeString_MultipleCharsAdded_MarshalsToExpected()
{
// Arrange
const string expected = "test";
var sut = new SafeString();
// Act
await sut.AppendAsync("t");
await sut.AppendAsync("es");
await sut.AppendAsync('t');
// Assert
var actual = (await sut.RevealDecryptedStringAsync()).String;
Assert.That(actual, Is.EqualTo(expected));
}
public async Task IsNullOrEmpty_ForObjectHoldingMultipleBytes_ReturnsFalse(
[Random(0, 256, 1)] int i1, [Random(0, 256, 1)] int i2, [Random(0, 256, 1)] int i3)
{
// Arrange
var sut = GetSut();
char c1 = (char)i1, c2 = (char)i2, c3 = (char)i3;
await sut.AppendAsync(c1);
await sut.AppendAsync(c2);
await sut.AppendAsync(c3);
// Act
var isNull = SafeString.IsNullOrEmpty(sut);
// Assert
Assert.That(isNull, Is.False);
}
public void String_AfterSettingSafeString_returnsStringOfSafeString()
{
//Arrange
var sut = GetSut();
const string expected = "갿äÅ++¨¨'e";
var safeString = new SafeString();
foreach (var ch in expected.ToCharArray())
{
safeString.Append(ch);
}
//Act
sut.SafeString = safeString;
var actual = sut.String;
//Assert
Assert.That(actual, Is.EqualTo(expected));
}
public void String_AfterDisposingTheInstance_doesNotReturnPlainText()
{
//Arrange
var sut = GetSut();
const string plainText = "testString";
var safeString = new SafeString();
foreach (var ch in plainText.ToCharArray())
{
safeString.Append(ch);
}
//Act
sut.SafeString = safeString;
sut.Dispose();
var actual = sut.String;
//assert
Assert.That(actual, Is.Not.EqualTo(plainText));
}
public async Task SafeString_ModifiedByAnotherThread_ModifiesAsExpected()
{
// Arrange
var sut = new SafeString();
await sut.AppendAsync("test");
// Act
var thread = new Thread(() =>
{
sut.Remove(1);
sut.Remove(1);
});
thread.Start();
thread.Join();
// Assert
var actual = (await sut.RevealDecryptedStringAsync()).String;
Assert.That(actual, Is.EqualTo("tt"));
}
