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gpg: refactor ecdh case

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This commit is contained in:
Roman Zeyde 2016-06-03 14:39:16 +03:00
parent c1c679b541
commit e7bacf829c
1 changed files with 22 additions and 12 deletions
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32
trezor_agent/gpg/agent.py
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@ -57,23 +57,36 @@ def _serialize_point(data):
return '(5:value' + data + ')'
def parse_ecdh(line):
prefix, line = line.split(' ', 1)
assert prefix == 'D'
exp, leftover = keyring.parse(keyring.unescape(line))
log.debug('ECDH s-exp: %r', exp)
assert not leftover
label, exp = exp
assert label == b'enc-val'
assert exp[0] == b'ecdh'
items = exp[1:]
log.debug('ECDH parameters: %r', items)
return dict(items)['e']
def pkdecrypt(keygrip, conn):
for msg in [b'S INQUIRE_MAXLEN 4096', b'INQUIRE CIPHERTEXT']:
keyring.sendline(conn, msg)
line = keyring.recvline(conn)
prefix, line = line.split(' ', 1)
assert prefix == 'D'
exp, leftover = keyring.parse(keyring.unescape(line))
assert keyring.recvline(conn) == b'END'
remote_pubkey = parse_ecdh(line)
pubkey = decode.load_public_key(keyring.export_public_key(user_id=None),
local_pubkey = decode.load_public_key(
pubkey_bytes=keyring.export_public_key(user_id=None),
use_custom=True)
f = encode.Factory.from_public_key(pubkey=pubkey,
user_id=pubkey['user_id'])
f = encode.Factory.from_public_key(
pubkey=local_pubkey, user_id=local_pubkey['user_id'])
with contextlib.closing(f):
### assert f.pubkey.keygrip == binascii.unhexlify(keygrip)
pubkey = dict(exp[1][1:])['e']
shared_secret = f.get_shared_secret(pubkey)
shared_secret = f.get_shared_secret(remote_pubkey)
assert len(shared_secret) == 65
assert shared_secret[:1] == b'\x04'
@ -116,9 +129,6 @@ def handle_connection(conn):
elif command == 'PKDECRYPT':
sec = pkdecrypt(keygrip, conn)
keyring.sendline(conn, b'D ' + sec)
elif command == 'END':
log.error('closing connection')
return
else:
log.error('unknown request: %r', line)
return