I want to get a SHA256 Hash that gives me the same result as I get on the terminal
echo -n "hello world" | shasum -0 -a 256
e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
I tried two different scripts
const {Sha256} = require('@aws-crypto/sha256-js');
(async () => {
const hash = new Sha256();
hash.update('hello world');
const result = await hash.digest();
let hex = Buffer.from(result).toString('hex');
console.log(hex);
})()
And
var hash = require('hash.js')
console.log(hash.sha256().update('hello world').digest('hex'))
They both give me the hash b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9
How can I get the same hash from the shasum in my terminal?
If you ask the man page of shasum you will see;
-0, --01 read in BITS mode ASCII '0' interpreted as 0-bit, ASCII '1' interpreted as 1-bit, all other characters ignored
That reads only 0s and 1s from the file ( pipe in your case). Now remove the parameter -0 or better define the default
-t, --text read in text mode (default)
$ echo -n "hello world" | shasum -t -a 256 | cut -c -64 b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9
Now we have the same output.
Note 1: that the cut is used to remove the space and dash in the end.
Not 2 : NIST has test vector in Cryptographic Algorithm Validation Program and SHA-256 value of empty string (length 0) is given as in the file SHA256ShortMsg.rsp;
Len = 0 Msg = 00 MD = e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
Note 3: For the NIST's hash function, one should not rely on the third-party result. They need to look at NIST vectors.