This is a toy implementation of the [SHA-224, SHA-256] digest algorithms, implemented in Rust.
There are a few simple arguments to the program:
~/code/sha-2 ~>> cargo build --release
Finished release [optimized] target(s) in 0.03s
~/code/sha-2 ~>> ./target/release/sha-2 --test
tests completed successfully!
~/code/sha-2 ~>> ./target/release/sha-2 --string abcde
no algorithim specified; assuming SHA-256
36bbe50ed96841d10443bcb670d6554f0a34b761be67ec9c4a8ad2c0c44ca42c
~/code/sha-2 ~>> echo -n abcde > input_file.txt
~/code/sha-2 ~>> ./target/release/sha-2 --path input_file.txt --algo 256
36bbe50ed96841d10443bcb670d6554f0a34b761be67ec9c4a8ad2c0c44ca42c
~/code/sha-2 ~>> ./target/release/sha-2 --path input_file.txt --algo 224
bdd03d560993e675516ba5a50638b6531ac2ac3d5847c61916cfced6
I tested the performance of this code against the built-in shasum command-line tool in OSX using the 2006 English Wikipedia Corpus, whose size comes in around ~954Mb.
~/code/sha-2 ~>> time ./target/release/sha-2 --path ~/Downloads/wiki/enwik9 --algo 256
159b85351e5f76e60cbe32e04c677847a9ecba3adc79addab6f4c6c7aa3744bc
real 0m4.413s
user 0m4.216s
sys 0m0.254s
~/code/sha-2 ~>> time shasum -a 256 ~/Downloads/wiki/enwik9
159b85351e5f76e60cbe32e04c677847a9ecba3adc79addab6f4c6c7aa3744bc /Users/mike/Downloads/wiki/enwik9
real 0m3.003s
user 0m2.856s
sys 0m0.139s
This code comes in around 132% of the digest time of that tool.