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STMicroelectronics STM32F405

STMicroelectronics STM32F405
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Cryptographic processor (CRYP) RM0090
718/1731 DocID018909 Rev 11
Figure 220. DES/TDES-CBC mode encryption
1. K: key; C: cipher text; I: input block; O: output block; Ps: plain text before swapping (when decoding) or
after swapping (when encoding); P: plain text; IV: initialization vectors.
).&)&/
$%!ENCRYPT
+
0 BITS
$%!DECRYPT
+
$%!ENCRYPT
+
/54&)&/
/BITS
PLAINTEXT0
CIPHERTEXT#



0SBITS
SWAPPING
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)BITS
BEFORE#290
ISENABLED
/ISWRITTENBACK
INTO)6ATTHE
SAMETIMEASIT
ISPUSHEDINTO
THE/54&)&/
SWAPPING
#BITS
$!4!490%
$!4!490%
!("DATAWRITE
AIB

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