urbit/shrub
1
1
Fork 0
mirror of https://github.com/urbit/shrub.git synced 2024-12-25 21:12:56 +03:00
Code Issues Packages Projects Releases Wiki Activity
7a40b1137e
shrub/pkg/ent
History
Benjamin Summers 9618f37965 Add 'pkg/ent/' from commit '31ac2913f14c6f7631f5792ad942605fb2d9fb87' 
git-subtree-dir: pkg/ent
git-subtree-mainline: 1207c204cb
git-subtree-split: 31ac2913f1
2019-03-04 16:49:14 -08:00
..
.gitignore Add 'pkg/ent/' from commit '31ac2913f14c6f7631f5792ad942605fb2d9fb87' 2019-03-04 16:49:14 -08:00
configure Add 'pkg/ent/' from commit '31ac2913f14c6f7631f5792ad942605fb2d9fb87' 2019-03-04 16:49:14 -08:00
ent.c Add 'pkg/ent/' from commit '31ac2913f14c6f7631f5792ad942605fb2d9fb87' 2019-03-04 16:49:14 -08:00
ent.h Add 'pkg/ent/' from commit '31ac2913f14c6f7631f5792ad942605fb2d9fb87' 2019-03-04 16:49:14 -08:00
LICENSE Add 'pkg/ent/' from commit '31ac2913f14c6f7631f5792ad942605fb2d9fb87' 2019-03-04 16:49:14 -08:00
Makefile Add 'pkg/ent/' from commit '31ac2913f14c6f7631f5792ad942605fb2d9fb87' 2019-03-04 16:49:14 -08:00
README.md Add 'pkg/ent/' from commit '31ac2913f14c6f7631f5792ad942605fb2d9fb87' 2019-03-04 16:49:14 -08:00
test.c Add 'pkg/ent/' from commit '31ac2913f14c6f7631f5792ad942605fb2d9fb87' 2019-03-04 16:49:14 -08:00

README.md

libent

libent is a cross-platform wrapper around getentropy(2). It exports one symbol, ent_getentropy. If getentropy is available, then it's just a shim around that. Otherwise, it uses getrandom(2) (available since kernel 3.17) on Linux, or /dev/urandom on other *nix.

Building and Testing

./configure
make
make test
PREFIX=/usr/local make install

Why?

getentropy is the wave of the future. It's the correct API for generating small amounts of entropy to create cryptographic keys or seed PRNGs. It's good and reasonable and true, it's on Linux, *BSD, and OS X, and it only took us fifty years of UNIX to get here.

Sadly, it only just arrived, so nobody has it yet. It didn't land in Linux until glibc 2.25, which seems to only have made it into Debian 10.

Once getentropy is everywhere you care about, you can just do a s/ent_//g on all the call sites and discard this shim.

This project began because Urbit's entropy-generation function was bothering me. Then it got out of hand.

References