    The SHA module allows you to use the NIST SHA message digest algorithm
    from within Perl programs.

    The final message digest value is returned by the digest operation as a
    20-byte binary string. This operation delivers the result of operations
    since the last new or reset operation. Once the operation has been
    performed, the context must be reset before being used to calculate
    another digest value.

Homepage:
https://metacpan.org/release/SHA
