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Digest::SHA is a complete implementation of the NIST Secure Hash Standard. It gives Perl programmers a convenient way to calculate SHA-1, SHA-224, SHA-256, SHA-384, SHA-512, SHA-512/224, and SHA-512/256 message digests. The module can handle all types of input, including partial-byte data.
The Digest::SHA1 module allows you to use the NIST SHA-1 message digest algorithm from within Perl programs. The algorithm takes as input a message of arbitrary length and produces as output a 160-bit "fingerprint" or "message digest" of the input. The Digest::SHA1 module provide a procedural interface for simple use, as well as an object oriented interface that can handle messages of arbitrary length and which can read files directly. A binary digest will be 20 bytes long. A hex digest will be 40 characters long. A base64 digest will be 27 characters long.
Perl has two pseudo-constants describing the current location in your source code, __FILE__ and __LINE__. This module adds __DIR__, which expands to the directory your source file is in, as an absolute pathname.