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http signatures: add signing support

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This commit is contained in:
William Pitcock 2018-08-10 17:08:30 -05:00
parent 13335b14d3
commit df62c1353e
1 changed files with 22 additions and 1 deletions
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23
viera/http_signatures.py
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@ -32,7 +32,28 @@ def split_signature(sig):
def build_signing_string(headers, used_headers):
return '\n'.join(map(lambda x: ': '.join([x, headers[x]]), used_headers))
return '\n'.join(map(lambda x: ': '.join([x.lower(), headers[x]]), used_headers))
def sign_headers(headers, key, key_id):
used_headers = headers.keys()
sig = {
'keyId': key_id,
'algorithm': 'rsa-sha256',
'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')
chunks = ['{}="{}"'.format(k, v) for k, v in sig.items()]
return ','.join(chunks)
async def fetch_actor_key(actor):