commit 2ae8ea381830c466b54b7b383f8fe232406094e8
Author: Damian Johnson <[email protected]>
Date: Mon Jun 19 12:10:58 2017 -0700
Constants for padding attributes
Bit more readable this way. Also, we can drop the lower() from the hexdigest
since it already is.
---
stem/descriptor/server_descriptor.py | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/stem/descriptor/server_descriptor.py
b/stem/descriptor/server_descriptor.py
index 724684d..03008ac 100644
--- a/stem/descriptor/server_descriptor.py
+++ b/stem/descriptor/server_descriptor.py
@@ -76,6 +76,10 @@ except ImportError:
SigningKey = collections.namedtuple('SigningKey', ['public', 'private',
'descriptor_signing_key'])
+DIGEST_TYPE_INFO = b'\x00\x01'
+DIGEST_PADDING = b'\xFF'
+DIGEST_SEPARATOR = b'\x00'
+
# relay descriptors must have exactly one of the following
REQUIRED_FIELDS = (
'router',
@@ -249,8 +253,8 @@ def _generate_signature(content, signing_key):
# generate the digest with required PKCS1 padding so it's 128 bytes
- digest = hashlib.sha1(content).hexdigest().lower().decode('hex_codec')
- digest = b'\x00\x01' + (b'\xFF' * (125 - len(digest))) + b'\x00' + digest
+ digest = hashlib.sha1(content).hexdigest().decode('hex_codec')
+ digest = DIGEST_TYPE_INFO + (DIGEST_PADDING * (125 - len(digest))) +
DIGEST_SEPARATOR + digest
padding = padding.PSS(mgf = padding.MGF1(hashes.SHA256()), salt_length =
padding.PSS.MAX_LENGTH)
return base64.b64encode(signing_key.private.sign(digest, padding,
hashes.SHA256()))
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