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Cryptography Registers

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10.2.1.22 AESAUTHLEN Register (Offset = 55Ch) [reset = X]

AESAUTHLEN is shown in Figure 10-24 and described in Table 10-32.

AES Authentication Length

Figure 10-24. AESAUTHLEN Register

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

LEN

W-X

Table 10-32. AESAUTHLEN Register Field Descriptions

Bit Field Type Reset Description

31-0 LEN W X

Authentication data length in bytes for combined mode, CCM only.

Supported AAD-lengths for CCM are from 0 to (216 - 28) bytes.

Once processing with this context is started, this length decrements

to zero. Writing this register triggers the engine to start using this

context for CCM.

848

SWCU117A–February 2015–Revised March 2015

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