hmaccalc can be used to compute HMAC (hash-based message authentication code) values for files. An HMAC is similar in concept to a message digest, except in that its calculation also incorporates a key which must be known to both the party generating the HMAC and the party verifying the HMAC.

The hmaccalc package includes multiple binaries (sha1hmac, sha256hmac, sha384hmac, sha512hmac) which aim to perform similarly to the sha*sum tools which are part of the coreutils package, and which use the NSS library to digest file contents.

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