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Fix retrieve ltk key with ediv and rand instead of role #890

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Fix retrieve ltk key with ediv and rand instead of role #890

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b348195
fix: retrieve ltk key with ediv and rand instead of role
yannpoupon Feb 13, 2026
38da62c
chore: apply black on file
yannpoupon Feb 17, 2026
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18 changes: 14 additions & 4 deletions bumble/device.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4836,11 +4836,21 @@ async def get_long_term_key(
if keys.ltk:
return keys.ltk.value

if connection.role == hci.Role.CENTRAL and keys.ltk_central:
return keys.ltk_central.value
# Check both ltk_central and ltk_peripheral by matching EDIV+Rand
if (
keys.ltk_central
and keys.ltk_central.ediv == ediv
and keys.ltk_central.rand == rand
):
return keys.ltk_central.value

if (
keys.ltk_peripheral
and keys.ltk_peripheral.ediv == ediv
and keys.ltk_peripheral.rand == rand
):
return keys.ltk_peripheral.value

if connection.role == hci.Role.PERIPHERAL and keys.ltk_peripheral:
return keys.ltk_peripheral.value
return None

async def get_link_key(self, address: hci.Address) -> bytes | None:
Expand Down