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# Copyright 2013-2021 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 sys
import spack.util.crypto
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()
if sys.version_info[0] >= 3:
b32_hash = b32_hash.decode('utf-8')
return b32_hash
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)
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