digest v0.6.12

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Create Compact Hash Digests of R Objects

Implementation of a function 'digest()' for the creation of hash digests of arbitrary R objects (using the 'md5', 'sha-1', 'sha-256', 'crc32', 'xxhash' and 'murmurhash' algorithms) permitting easy comparison of R language objects, as well as a function 'hmac()' to create hash-based message authentication code. Please note that this package is not meant to be deployed for cryptographic purposes for which more comprehensive (and widely tested) libraries such as 'OpenSSL' should be used.

Readme

digest Build Status License CRAN Downloads Code Coverage

Compact hash representations of arbitrary R objects

Overview

The digest package provides a principal function digest() for the creation of hash digests of arbitrary R objects (using the md5, sha-1, sha-256, crc32, xxhash and murmurhash algorithms) permitting easy comparison of R language objects.

Examples

As R can serialize any object, we can run digest() on any object:

R> library(digest)
R> digest(trees)
[1] "12412cbfa6629c5c80029209b2717f08"
R> digest(lm(log(Height) ~ log(Girth), data=trees))
[1] "e25b62de327d079b3ccb98f3e96987b1"
R> digest(summary(lm(log(Height) ~ log(Girth), data=trees)))
[1] "86c8c979ee41a09006949e2ad95feb41"
R>

By using the hash sum, which is very likely to be unique, to identify an underlying object or calculation, one can easily caching strategies for which the digest package is somewhat widely used.

Other Functions

A small number of additional functions is available:

  • sha1() for numerally stable hashsums,
  • hmac() for hashed message authentication codes based on a key,
  • AES() for Advanced Encryption Standard block ciphers.

Note

Please note that this package is not meant to be deployed for cryptographic purposes for which more comprehensive (and widely tested) libraries such as OpenSSL should be used.

Author

Dirk Eddelbuettel, with contributions by Antoine Lucas, Jarek Tuszynski, Henrik Bengtsson, Simon Urbanek, Mario Frasca, Bryan Lewis, Murray Stokely, Hannes Muehleisen, Duncan Murdoch, Jim Hester, Wush Wu, Qiang Kou, Thierry Onkelinx, Michel Lang and Viliam Simko.

License

GPL (>= 2)

Functions in digest

Name Description
AES Create AES block cipher object
hmac compute a hash-based message authentication code
digest Create hash function digests for arbitrary R objects
makeRaw Create a raw object
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Details

Date 2017-01-26
URL http://dirk.eddelbuettel.com/code/digest.html
BugReports https://github.com/eddelbuettel/digest/issues
License GPL (>= 2)
VignetteBuilder knitr
NeedsCompilation yes
Packaged 2017-01-26 13:52:49.564188 UTC; edd
Repository CRAN
Date/Publication 2017-01-27 10:18:01

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