offset    int
	length    int
	algorithm BitrotAlgorithm
	expError  error
}{
	{file: "myobject", offset: 0, length: 100, algorithm: SHA256, expError: nil},                // 0
	{file: "myobject", offset: 25, length: 74, algorithm: SHA256, expError: nil},                // 1
	{file: "myobject", offset: 29, length: 70, algorithm: SHA256, expError: nil},                // 2