Module security 

IEEE 802.15.4 Auxiliary Security Header parsing and building.

The Auxiliary Security Header is present when the Security Enabled bit is set in the Frame Control Field. It consists of:

• Security Control (1 byte)
• Frame Counter (4 bytes, LE)
• Key Identifier (variable length, based on Key Identifier Mode)

Structs

AuxSecurityHeader

Security Control field bit layout (1 byte): Bits 0-2: Security Level (3 bits) Bits 3-4: Key Identifier Mode (2 bits) Bits 5-7: Reserved (3 bits) Parsed representation of an Auxiliary Security Header.

Functions

read_key_id_mode

Read the key identifier mode from a Security Control byte.

read_security_level

Read the security level from a Security Control byte.