public void Clone_SeperateStateFromOriginal()
{
var digest = new SHA1Digest();
var buffer = Encoding.UTF8.GetBytes("The quick brown fox jumps");
digest.Update(buffer);
var digest2 = digest.Clone();
buffer = Encoding.UTF8.GetBytes(" over the lazy dog");
digest2.Update(buffer);
var result1 = digest.DigestBuffer();
var result2 = digest2.DigestBuffer();
AssertSHA1("743e27565bb39d4cf6cdf7b19450f94ef12b2206", result1);
AssertSHA1("2fd4e1c67a2d28fced849ee1bb76e7391b93eb12", result2);
}