Source code for spack.util.hash

# Copyright 2013-2024 Lawrence Livermore National Security, LLC and other
# Spack Project Developers. See the top-level COPYRIGHT file for details.
# SPDX-License-Identifier: (Apache-2.0 OR MIT)

import base64
import hashlib

import spack.util.crypto

[docs] def b32_hash(content): """Return the b32 encoded sha1 hash of the input string as a string.""" sha = hashlib.sha1(content.encode("utf-8")) b32_hash = base64.b32encode(sha.digest()).lower() b32_hash = b32_hash.decode("utf-8") return b32_hash
[docs] def base32_prefix_bits(hash_string, bits): """Return the first <bits> bits of a base32 string as an integer.""" if bits > len(hash_string) * 5: raise ValueError("Too many bits! Requested %d bit prefix of '%s'." % (bits, hash_string)) hash_bytes = base64.b32decode(hash_string, casefold=True) return spack.util.crypto.prefix_bits(hash_bytes, bits)