CC1110-RTR1 datasheet(127/203 Pages) TI

127 / 203 page

CC1110

CC1110 PRELIMINARY Datasheet (Rev. 1.01) SWRS033A

Page 127 of 202

The Additional Authentication Data is

appended to the A_Data length field L(a).

The Additional Authentication Blocks is

padded with zeros until the last Additional

Authentication Block is full. There is no

restriction on the length of a.

AUTH-DATA = L(a) + Authentication Data

+ (zero padding)

(4) The last block of the message is

padded with 0s until full (that is if its length

is not a multiple of 128).

(5)

The software concatenates the block

B0, the Additional Authentication Blocks if

any, and the message;

Input message = B0 + AUTH-DATA +

Message + (zero padding of message)

(6)

Once the input message authentication

by CBC-MAC is finished, the software

leaves the uploaded buffer contents

unchanged (M=16), or keeps only the

buffer’s higher M bytes unchanged, while

setting the lower bits to 0 (M != 16).

The result is called T.

Message Encryption

(7)

The software creates the key stream

block A0. Note that L=6, with the current

example of the CTR generation. The

content is shown in Figure 24:

Name

Designation

First CTR value for CCM mode

Byte

Name

Flag

NONCE

CTR

Figure 24: Message Encryption Phase Block 0

Note that any value but zero works for the

CTR value.

The content of the Encryption Flag byte is

described in Figure 25

Name

FLAG/A0

Designation

Encryption Flag Field for CCM mode

Bit

Name

Reserved

L-1

Value

Figure 25: Encryption Flag Byte

(8) The software loads A0 by selecting a

Load IV/Nonce command. To do so, it sets

Mode to CFB or OFB at the same time it

selects the Load IV/Nonce command.

(9)

The software calls a CFB or an OFB

encryption on the authenticated data T.

The

uploaded

buffer

contents

stay

unchanged (M=16), or only its first M bytes

stay unchanged, the others being set to 0

(M-16). The result is U, which will be used

later.

(10) The software calls a CTR mode

encryption right now on the still padded

message blocks. It does not have to

reload the IV/CTR.

(11)

The encrypted authentication data U

is appended to the encrypted message.

This gives the final result, c.

CC1110-RTR1 데이터시트(PDF) 127 Page - Texas Instruments

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