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sm_cmac_signed_write_start() function
Support for signed writes, used by att_server.
Syntax
void sm_cmac_signed_write_start(const sm_key_t key,
uint8_t opcode,
uint16_t attribute_handle,
uint16_t message_len,
const uint8_t * message,
uint32_t sign_counter,
void (*done_callback)(uint8_t * hash));
Notes
Message is in little endian to allows passing in ATT PDU without flipping. signing data: [opcode, attribute_handle, message, sign_counter] calculated hash in done_callback is big endian and has 16 byte.