public void HashesEmptyBuffer()
{
// Arrange
using (var target = new MD5IncrementalHash())
{
// Act
target.AppendData(Empty, 0, 0);
var actual = target.GetHashAndReset();
// Assert
Assert.Equal(HashOfEmpty, actual);
}
}
public void ProducesKnownHash()
{
// Arrange
using (var target = new MD5IncrementalHash())
{
// Act
target.AppendData(Foobar, 0, Foobar.Length);
var actual = target.GetHashAndReset();
// Assert
Assert.Equal(HashOfFoobar, actual);
}
}
public void ResetAllowsReuse()
{
// Arrange
using (var target = new MD5IncrementalHash())
{
var firstInput = Encoding.ASCII.GetBytes("ignored");
// Act
target.AppendData(firstInput, 0, firstInput.Length);
target.GetHashAndReset();
target.AppendData(Foobar, 0, Foobar.Length);
var actual = target.GetHashAndReset();
// Assert
Assert.Equal(HashOfFoobar, actual);
}
}
public void HashesPartOfTheProvidedBuffer()
{
// Arrange
using (var target = new MD5IncrementalHash())
{
var expected = new byte[] // MD5 hash of "ooba"
{
0xdb, 0xec, 0xe8, 0x01, 0xac, 0xcd, 0x4d, 0xb2,
0xed, 0x8c, 0x1c, 0x86, 0x3f, 0x5a, 0xad, 0x92
};
// Act
target.AppendData(Foobar, 1, 4);
var actual = target.GetHashAndReset();
// Assert
Assert.Equal(expected, actual);
}
}
public void CanBeRepeatedlyResetWithTheSameResut()
{
// Arrange
using (var target = new MD5IncrementalHash())
{
// Act
var first = target.GetHashAndReset();
var second = target.GetHashAndReset();
var third = target.GetHashAndReset();
// Assert
Assert.Equal(HashOfEmpty, first);
Assert.Equal(HashOfEmpty, second);
Assert.Equal(HashOfEmpty, third);
}
}
public static async Task<string> GetStreamContentMD5(Stream stream)
{
using (var md5 = new MD5IncrementalHash())
{
var buffer = new byte[8192];
var read = buffer.Length;
while (read > 0)
{
read = await stream.ReadAsync(buffer, 0, buffer.Length);
md5.AppendData(buffer, 0, read);
}
var hashBytes = md5.GetHashAndReset();
var hashBase64 = Convert.ToBase64String(hashBytes);
return hashBase64;
}
}
