protected void TransI(ref uint a, uint b, uint c, uint d, uint k, ushort s, uint i)
{
a = b + MD5Helper.RotateLeft(a + (c ^ (b | ~d)) + X[k] + T[i - 1], s);
}
protected void TransF(ref uint a, uint b, uint c, uint d, uint k, ushort s, uint i)
{
a = b + MD5Helper.RotateLeft(a + ((b & c) | (~b & d)) + X[k] + T[i - 1], s);
}