AES peripheral driver

AN3270

14/23

Doc ID 17919 Rev 2

Figure 10.

AES encryption mode: implementation using AES peripheral driver

1.

Once set, Computation Complete Flag (CCF) should be cleared in multiple block processing using the

following function AES_ClearFlag(AES_FLAG_CCF).

CLK_PeripheralClockConfig(CLK_Peripheral_AES, ENABLE)

AES_OperationModeConfig(AES_Operation_Encryp)

AES_Cmd(ENABLE)

Counter = 0

AES_WriteSubKey(EncryptionKey[Counter])

AES_WriteSubData(InputText[Counter])

Counter = 16?

while(AES_GetFlagStatus(AES_FLAG_CCF) == RESET)

(1)

Counter++

Counter = 16?

End

Counter = 0

OutputText[Counter] = AES_ReadSubData()

Input phase

Computation phase

Output phase

Counter++

MS19724V1