You should call it SHA1 Generator (at the top), and not HASH Generator, for hash could mean many different hashing algorithms like:

MD5 (unsecure)

SHA0 (unsecure)

SHA1 (unsecure)

SHA256 (relatively secure)

SHA512 (secure for the moment)

WHIRLPOOL (most secure to date, but requires a lot of resources)

Note: the above meaning of 'secure' and 'unsecure' refer to the level of difficulty to find a collision.