Overview
The digest package provides a principal functiondigest() for the creation of hash digests of arbitrary Robjects (using the md5, sha-1, sha-256, crc32, xxhash, murmurhash,spookyhash and blake3 algorithms) permitting easy comparison of Rlanguage objects.
Examples
As R can serialize any object, we can rundigest() onany 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 identifyan underlying object or calculation, one can easily implement cachingstrategies. This is a common use of the digest package.
Other Functions
A small number of additional functions is available:
sha1()for numerally stable hashsums,hmac()for hashed message authentication codes based ona key,AES()for Advanced Encryption Standard blockciphers.
Note
Please note that this package is not meant to be deployed forcryptographic purposes. More comprehensive and widely tested librariessuch as OpenSSL should be used instead.
Installation
The package is onCRAN andcan be installed via a standard
install.packages("digest")Continued Testing
As we rely on thetinytest package,the already-installed package can also be verified via
tinytest::test_package("digest")at any later point.
Author
Dirk Eddelbuettel, with contributions by Antoine Lucas, JarekTuszynski, Henrik Bengtsson, Simon Urbanek, Mario Frasca, Bryan Lewis,Murray Stokely, Hannes Muehleisen, Duncan Murdoch, Jim Hester, Wush Wu,Qiang Kou, Thierry Onkelinx, Michel Lang, Viliam Simko, Kurt Hornik,Radford Neal, Kendon Bell, Matthew de Queljoe, Ion Suruceanu, BillDenney, Dirk Schumacher, and Winston Chang.
License
GPL (>= 2)
Initially created: Sat Nov 12 09:53:12 CST 2003
Last modified: Sun May 26 10:01:17 CDT 2024