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Figure 27.1. AES Key and Data Definitions
Encryption
PlainText
PlainKey
Decryption
Encryption
Decryption
CipherText
CipherKey
27.3.1 Encryption/Decryption
The AES module can be set to encrypt or decrypt by clearing/setting the DECRYPT bit in AES_CTRL.
The AES256 bit in AES_CTRL configures the size of the key used for encryption/decryption. The
AES_CTRL register should not be altered while AES is running, as this may lead to unpredictable
behaviour.
An AES encryption/decryption can be started in the following ways:
? Writing a 1 to the START bit in AES_CMD
? Writing 4 times 32 bits to AES_DATA when the DATASTART control bit is set
? Writing 4 times 32 bits to AES_XORDATA when the XORSTART control bit is set
An AES encryption/decryption can be stopped by writing a 1 to the STOP bit in AES_CMD. The
RUNNING bit in AES_STATUS indicates that an AES encryption/decryption is ongoing.
27.3.2 Data and Key Access
The AES module contains a 128-bit DATA (State) register and two 128-bit KEY registers defined as
DATA3-DATA0, KEY3-KEY0 (KEYL) and KEY7-KEY4 (KEYH). In AES128 mode, the 128-bit key is read
from KEYL, while both KEYH and KEYL is used in AES256 mode. See Figure 27.2 (p. 381) . The
figure presents the key byte order for 256-bit keys. In 128-bit mode a 16 represents the first byte of the
128-bit key.
It is important to note the order of the individual bytes in the key and state in relation to how they are
defined in the Advanced Encryption Standard (FIPS-197).
Figure 27.2. AES Data and Key Orientation as Defined in the Advanced Encryption Standard
DATA
KEYH
KEYL
[ 31:24]
[ 23:16]
[ 15:8]
[ 7:0]
S 0,0
S 1,0
S 2,0
S 3,0
S 0,1
S 1,1
S 2,1
S 3,1
S 0,2
S 1,2
S 2,2
S 3,2
S 0,3
S 1,3
S 2,3
S 3,3
a 0
a 1
a 2
a 3
a 4
a 5
a 6
a 7
a 8
a 9
a 10
a 11
a 12
a 13
a 14
a 15
a 16
a 17
a 18
a 19
a 20
a 21
a 22
a 23
a 24
a 25
a 26
a 27
a 28
a 29
a 30
a 31
The registers DATA3-DATA0, are not memory mapped directly, but can be written/read by accessing
AES_DATA or AES_XORDATA. The same applies for the key registers, KEY3-KEY0 which are
accessed through AES_KEYLn (n=A, B, C or D), while KEY7-KEY4 are accessed through KEYHn
(n=A, B, C or D). Writing DATA3-DATA0 is then done through 4 consecutive writes to AES_DATA (or
AES_XORDATA), starting with the word which is to be written to DATA0. For each write, the words will
2011-04-12 - d0001_Rev1.10
381
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