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This allows to pair with devices that use reduced encryption key size. Encryption key size is stored with keys for future use. LTKs are kept in full form (16 bytes) and are reduced only when used. As master: < ACL Data TX: Handle 64 flags 0x00 dlen 11 SMP: Pairing Request (0x01) len 6 IO capability: NoInputNoOutput (0x03) OOB data: Authentication data not present (0x00) Authentication requirement: Bonding, No MITM, Legacy, No Keypresses (0x01) Max encryption key size: 16 Initiator key distribution: EncKey Sign (0x05) Responder key distribution: EncKey IdKey Sign (0x07) > ACL Data RX: Handle 64 flags 0x02 dlen 11 SMP: Pairing Response (0x02) len 6 IO capability: KeyboardDisplay (0x04) OOB data: Authentication data not present (0x00) Authentication requirement: No bonding, No MITM, Legacy, No Keypresses (0x00) Max encryption key size: 7 Initiator key distribution: <none> (0x00) Responder key distribution: <none> (0x00) ... < HCI Command: LE Start Encryption (0x08|0x0019) plen 28 Handle: 64 Random number: 0x0000000000000000 Encrypted diversifier: 0x0000 Long term key: df3cff52a981d6000000000000000000 As slave: > ACL Data RX: Handle 64 flags 0x02 dlen 11 SMP: Pairing Request (0x01) len 6 IO capability: KeyboardDisplay (0x04) OOB data: Authentication data not present (0x00) Authentication requirement: No bonding, No MITM, Legacy, No Keypresses (0x00) Max encryption key size: 7 Initiator key distribution: <none> (0x00) Responder key distribution: <none> (0x00) < ACL Data TX: Handle 64 flags 0x00 dlen 11 SMP: Pairing Response (0x02) len 6 IO capability: NoInputNoOutput (0x03) OOB data: Authentication data not present (0x00) Authentication requirement: No bonding, No MITM, Legacy, No Keypresses (0x00) Max encryption key size: 16 Initiator key distribution: <none> (0x00) Responder key distribution: <none> (0x00) ... > HCI Event: LE Meta Event (0x3e) plen 13 LE Long Term Key Request (0x05) Handle: 64 Random number: 0x0000000000000000 Encrypted diversifier: 0x0000 < HCI Command: LE Long Term Key Request Reply (0x08|0x001a) plen 18 Handle: 64 Long term key: 701b431a9e17bb000000000000000000 Change-Id: Ibc70aa01c040aff0d39410d273d6880d35aa5ae0 Signed-off-by: Szymon Janc <ext.szymon.janc@tieto.com> |
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bluetooth | ||
ip | ||
Kconfig | ||
Makefile |