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http signatures: cache things we've already signed

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this helps with the scatter/gather
This commit is contained in:
kaniini 2019-01-08 05:30:00 +00:00
parent 18b17f91e3
commit 190ccf27d1
1 changed files with 19 additions and 8 deletions
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27
relay/http_signatures.py
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@ -7,6 +7,7 @@ from Crypto.PublicKey import RSA
from Crypto.Hash import SHA, SHA256, SHA512
from Crypto.Signature import PKCS1_v1_5
from cachetools import LFUCache
from async_lru import alru_cache
from .remote_actor import fetch_actor
@ -37,6 +38,23 @@ def build_signing_string(headers, used_headers):
return '\n'.join(map(lambda x: ': '.join([x.lower(), headers[x]]), used_headers))
SIGSTRING_CACHE = LFUCache(1024)
def sign_signing_string(sigstring, key):
if sigstring in SIGSTRING_CACHE:
return SIGSTRING_CACHE[sigstring]
pkcs = PKCS1_v1_5.new(key)
h = SHA256.new()
h.update(sigstring.encode('ascii'))
sigdata = pkcs.sign(h)
sigdata = base64.b64encode(sigdata)
SIGSTRING_CACHE[sigstring] = sigdata.decode('ascii')
return SIGSTRING_CACHE[sigstring]
def sign_headers(headers, key, key_id):
headers = {x.lower(): y for x, y in headers.items()}
used_headers = headers.keys()
@ -46,14 +64,7 @@ def sign_headers(headers, key, key_id):
'headers': ' '.join(used_headers)
}
sigstring = build_signing_string(headers, used_headers)
pkcs = PKCS1_v1_5.new(key)
h = SHA256.new()
h.update(sigstring.encode('ascii'))
sigdata = pkcs.sign(h)
sigdata = base64.b64encode(sigdata)
sig['signature'] = sigdata.decode('ascii')
sig['signature'] = sign_signing_string(sigstring, key)
chunks = ['{}="{}"'.format(k, v) for k, v in sig.items()]
return ','.join(chunks)