nimsha2's Introduction

nimSHA2

Secure Hash Algorithm 2

224, 256, 384, and 512 bits

initially this was part of nimPDF project, then I decided to release it separately

example:

var sha = initSHA[SHA256]()
sha.update("test SHA256")
let digest = sha.final()

or:

let digest = computeSHA256("test SHA256")

conversion:

to convert digest into string, use proc $
to convert digest into hex string, use toHex

each version of SHA2 hash function will produce output according to it's name: SHA224 produce 224 bits hash, SHA256 produce 256 bits hash, and so on

already tested with test vector from here, see tests/test.nim

nimsha2's People

Contributors

Stargazers

Watchers

nimsha2's Issues

Inconsistent result between 0.17.2 and 0.18.0

The library is inconsistent between 0.17.2 and 0.18.0 versions:

Test case:

import nimSHA2

var a: SHA256Digest


a[0] = 'a'
a[1] = 'b'
a[10] = 'c'

echo system.`$`(a)
echo nimsha2.`$`(a)
echo $a
echo a.len

O.17.2

ab
ab
ab
32

0.18.0

['a', 'b', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', 'c', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00']
abc
abc
32

I suspect there are at least 2 reasons for this:

0.18.0 defines a $ operator on arrays
I don't know why but seems like $in 0.17.2 was not iterating for the full length, stopping at the first 0 and this was fixed.

Recommandation: To avoid the $ issue it might be needed to wrap the digest array in an object like what is done in keccak_tiny