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#!/usr/bin/env nomsu -V4.8.8.6
#
This file defines some actions for hashing files and looking up files by hash.
use "lib/os.nom"
use "lib/base64.nom"
lua> "local \%use_sha1, \%hashlib = pcall(require, 'openssl.digest')"
test:
assume (hash "hello world") == (hash "hello world")
assume ((hash "hello world") != (hash "goodbye")) or barf "\
..Hash collision:
(hash "hello world") = \(hash "hello world")
(hash "goodbye") = \(hash "goodbye")"
assume (..)
(..)
hash "\
..This is a really long string meant to stress test the hashing function and
ensure that it's not overflowing with long inputs."
..!= "inf"
assume ((hash "\000") != (hash "\000\000\000\000\000")) or barf "\
..Incorrect hashing of null strings"
if %use_sha1:
assume ((hash "hello world") == "Kq5sNclPz7QV2+lfQIuc6R7oRu0=")
if %use_sha1:
action [hash %]:
%hash = (=lua "\%hashlib.new('sha1'):final(\%)")
return (base64 %hash)
..else:
# TODO: remove warning?
say "\
..\027[31;1mWARNING: OpenSSL module not found. Defaulting to a non-cryptographically secure hash function.\027[0m"
action [hash %]:
%bytes = (%::bytes)
%hash = (%bytes.1 << 7)
for %i in 2 to (size of %bytes):
%hash = ((1000003 * %hash) ~ %bytes.%i)
%hash = (%hash ~ (size of %bytes))
return "\%hash"
action [file with hash %hash]:
for file %filename in ".":
%contents = (read file %filename)
%file_hash = (hash %contents)
if (%file_hash == %hash): return %filename
parse [hash of file %filename] as (hash (read file %filename))
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