This file is indexed.

/usr/lib/R/site-library/digest/INDEX is in r-cran-digest 0.6.9-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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AES                     Create AES block cipher object
digest                  Create hash function digests for arbitrary R
                        objects
hmac                    compute a hash-based message authentication
                        code
sha1                    Calculate a SHA1 hash of an object