DOT11_KEY_ALGO_TKIP_MIC structure

Description

[!Important] WiFiCx is the new Wi-Fi driver model released in Windows 11. We recommend that you use WiFiCx to take advantage of the latest features. The WDI driver model is now in maintenance mode and will only receive high priority fixes.

The DOT11_KEY_ALGO_TKIP_MIC structure defines a cipher key that is used by the TKIP algorithm for data encryption and decryption. The structure also defines a message integrity code (MIC) used by the Michael algorithm for verifying data integrity.

Members

ucIV48Counter

The initial 48-bit value of the TKIP Sequence Counter (TSC), which is used for replay protection. For more information about the TSC, see TKIP.

ulTKIPKeyLength

The length, in bytes, of the TKIP key material in the ucTKIPMICKeys array. If the authentication and cipher key derivation is performed by the operating system, this member will always have a value of 16.

ulMICKeyLength

The length, in bytes, of the MIC key material in the ucTKIPMICKeys array. If the authentication and cipher key derivation is performed by the operating system, this member will always have a value of 16. The first 8 bytes will be the MIC key used for received packets and the last 8 bytes will be the MIC key used for transmitted packets.

ucTKIPMICKeys

The TKIP and MIC key material.

Syntax

typedef struct DOT11_KEY_ALGO_TKIP_MIC {
  UCHAR ucIV48Counter[6];
  ULONG ulTKIPKeyLength;
  ULONG ulMICKeyLength;
  UCHAR ucTKIPMICKeys[1];
} DOT11_KEY_ALGO_TKIP_MIC, *PDOT11_KEY_ALGO_TKIP_MIC;

Remarks

The TKIP key starts at ucTKIPMICKeys [0]. The MIC key starts at ucTKIPMICKeys [ ulTKIPKeyLength ].

When the TKIP key is created, the 802.11 station must maintain separate TSC counters for the key for the send and receive path. The station must initialize the TSC counters in the following way:

• Initialize the TSC counter used for the receive path to the value specified in the ucIV48Counter member.
• Initialize the TSC counter used for the send path to any value.

See also

OID_DOT11_CIPHER_KEY_MAPPING_KEY

TKIP

DOT11_CIPHER_DEFAULT_KEY_VALUE