commit: 35d17f9331ac367a47e0e5277e63d766da097df3
Author: Michał Górny <mgorny <AT> gentoo <DOT> org>
AuthorDate: Sun Mar 12 16:32:06 2017 +0000
Commit: Michał Górny <mgorny <AT> gentoo <DOT> org>
CommitDate: Mon Mar 13 21:46:30 2017 +0000
URL: https://gitweb.gentoo.org/proj/portage.git/commit/?id=35d17f93
portage.checksum: Support pygcrypt as optimized fallback
pygcrypt uses libgcrypt which provides support for ripemd160, whirlpool,
SHA3, plus some algorithms not provided by any other library.
pym/portage/checksum.py | 38 ++++++++++++++++++++++++++++++++++++++
1 file changed, 38 insertions(+)
diff --git a/pym/portage/checksum.py b/pym/portage/checksum.py
index 2c482f5e7..92b41b133 100644
--- a/pym/portage/checksum.py
+++ b/pym/portage/checksum.py
@@ -135,6 +135,44 @@ if "SHA3_256" not in hashfunc_map or "SHA3_512" not in
hashfunc_map:
pass
+# Support pygcrypt as fallback using optimized routines from libgcrypt
+# (GnuPG).
+gcrypt_algos = frozenset(('RMD160', 'WHIRLPOOL', 'SHA3_256', 'SHA3_512'))
+if gcrypt_algos.difference(hashfunc_map):
+ try:
+ import binascii
+ import pygcrypt.hashcontext
+
+ class GCryptHashWrapper(object):
+ def __init__(self, algo):
+ self._obj =
pygcrypt.hashcontext.HashContext(algo=algo)
+
+ def update(self, data):
+ self._obj.write(data)
+
+ def hexdigest(self):
+ return
binascii.b2a_hex(self._obj.read()).decode()
+
+ name_mapping = {
+ 'RMD160': 'ripemd160',
+ 'WHIRLPOOL': 'whirlpool',
+ 'SHA3_256': 'sha3-256',
+ 'SHA3_512': 'sha3-512',
+ }
+
+ for local_name, gcry_name in name_mapping.items():
+ try:
+ pygcrypt.hashcontext.HashContext(algo=gcry_name)
+ except Exception: # yes, it throws Exception...
+ pass
+ else:
+ _generate_hash_function(local_name,
+
functools.partial(GCryptHashWrapper, gcry_name),
+ origin="pygcrypt")
+ except ImportError:
+ pass
+
+
# Use pycrypto when available, prefer it over the internal fallbacks
# Check for 'new' attributes, since they can be missing if the module
# is broken somehow.
