public void MaximumOffset(byte[] hmacResult, int offset)
{
var sha1HashList = Enumerable.Repeat((byte)0, 19).ToList();
sha1HashList.Add(byte.MaxValue);
"Given a valid SHA1 encrypted hash"
.x(() => hmacResult = sha1HashList.ToArray());
"When the offset is calculated from the maximum byte 11111111"
.x(() => offset = TestInstance.ComputeOffset(hmacResult));
"Then the offset is 15"
.x(() => offset.ShouldBe(15));
}
public void OffsetFromLeastSignificantByte(byte[] hmacResult, int offset)
{
var offsetByte = Faker.Random.Byte(1, 14);
var sha1HashList = Enumerable.Repeat((byte)0, 19).ToList();
sha1HashList.Add(offsetByte);
"Given a valid SHA1 encrypted hash"
.x(() => hmacResult = sha1HashList.ToArray());
"When the offset is calculated"
.x(() => offset = TestInstance.ComputeOffset(hmacResult));
"Then the offset was calculated from the least significant byte"
.x(() => offset.ShouldBe(offsetByte & 0xf));
}