his a C++ class that implements the Secure Hash Algorithm SHA-1. The purpose of the algorithm is to calculate a strong hash of given bit string. By "strong", we mean that it is very difficult to find a different bit string that results in the same hash. It is similarly difficult, using only the hash, to determine the original bit string. SHA-1 produces a 20 byte (160 bit) hash.-his is a C++ class that implements the Secure Hash Algorithm SHA-1. The purpose of the algorithm is to calculate a strong hash of given bit string. By "strong", we mean that it is very difficult to find a different bit string that results in the same hash. It is similarly difficult, using only the hash, to determine the original bit string. SHA-1 produces a 20 byte (160 bit) hash.