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implement debug mode for smp manager using defined private / public key pair

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Markus Jellitsch
2026-04-03 23:02:15 +02:00
parent 4e76d3057b
commit c3daf4a7e1
1 changed files with 22 additions and 0 deletions
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22
bumble/smp.py
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@@ -178,6 +178,16 @@ class AuthReq(hci.SpecableFlag):
SMP_CTKD_H7_LEBR_SALT = bytes.fromhex('000000000000000000000000746D7031')
SMP_CTKD_H7_BRLE_SALT = bytes.fromhex('000000000000000000000000746D7032')
# Diffie-Hellman private / public key pair in Debug Mode (Core - Vol. 3, Part H)
SMP_DEBUG_KEY_PRIVATE = bytes.fromhex(
'3f49f6d4 a3c55f38 74c9b3e3 d2103f50 4aff607b eb40b799 5899b8a6 cd3c1abd'
)
SMP_DEBUG_KEY_PUBLIC_X = bytes.fromhex(
'20b003d2 f297be2c 5e2c83a7 e9f9a5b9 eff49111 acf4fddb cc030148 0e359de6'
)
SMP_DEBUG_KEY_PUBLIC_Y= bytes.fromhex(
'dc809c49 652aeb6d 63329abf 5a52155c 766345c2 8fed3024 741c8ed0 1589d28b'
)
# fmt: on
# pylint: enable=line-too-long
# pylint: disable=invalid-name
@@ -187,6 +197,8 @@ SMP_CTKD_H7_BRLE_SALT = bytes.fromhex('000000000000000000000000746D7032')
# Utils
# -----------------------------------------------------------------------------
# Test DH with test vectors from the spec
# -----------------------------------------------------------------------------
# Classes
@@ -1919,6 +1931,7 @@ class Manager(utils.EventEmitter):
self._ecc_key = None
self.pairing_config_factory = pairing_config_factory
self.session_proxy = Session
self.debug_mode = False
def send_command(self, connection: Connection, command: SMP_Command) -> None:
logger.debug(
@@ -1965,6 +1978,15 @@ class Manager(utils.EventEmitter):
@property
def ecc_key(self) -> crypto.EccKey:
if self.debug_mode:
# Core - Vol 3, Part H:
# When the Security Manager is placed in a Debug mode it shall use the
# following Diffie-Hellman private / public key pair:
debug_key = crypto.EccKey.from_private_key_bytes(SMP_DEBUG_KEY_PRIVATE)
assert debug_key.x == SMP_DEBUG_KEY_PUBLIC_X
assert debug_key.y == SMP_DEBUG_KEY_PUBLIC_Y
return debug_key
if self._ecc_key is None:
self._ecc_key = crypto.EccKey.generate()
assert self._ecc_key