packrat/lib/x86_64-pc-linux-gnu/3.2.3/openssl/doc/crypto_hashing.R

In etsakl/DasyMapR: Geographical ETRS-LAEA Grid Based Dasymetric Mapping

## ---- echo = FALSE, message = FALSE--------------------------------------
knitr::opts_chunk$set(comment = "")
library(openssl)

## ------------------------------------------------------------------------
md5("foo")
md5(charToRaw("foo"))

## ------------------------------------------------------------------------
# Vectorized for strings
md5(c("foo", "bar", "baz"))

## ------------------------------------------------------------------------
# Stream-hash a file
myfile <- system.file("CITATION")
md5(file(myfile))

## ----eval=FALSE----------------------------------------------------------
#  # Stream-hash from a network connection
#  md5(url("http://cran.us.r-project.org/bin/windows/base/old/3.1.1/R-3.1.1-win.exe"))

## ------------------------------------------------------------------------
# Compare to digest
library(digest)
digest("foo", "md5", serialize = FALSE)

# Other way around
digest(cars, skip = 0)
md5(serialize(cars, NULL))