Figure 196. Des/Tdes-Ecb Mode Encryption; Figure 197. Des/Tdes-Ecb Mode Decryption - ST STM32F205 series Reference Manual

Cryptographic processor (CRYP)
1. K: key; C: cipher text; I: input block; O: output block; P: plain text.
1. K: key; C: cipher text; I: input block; O: output block; P: plain text.
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Figure 196. DES/TDES-ECB mode encryption

DATATYPE
64
K1
64
K2
64
K3
DATATYPE

Figure 197. DES/TDES-ECB mode decryption

DATATYPE
64
K3
64
K2
64
K1
DATATYPE
RM0033 Rev 8
IN FIFO
plaintext P
P, 64 bits
swapping
DEA, encrypt
DEA, decrypt
DEA, encrypt
O, 64 bits
swapping
C, 64 bits
OUT FIFO
ciphertext C
IN FIFO
ciphertext C
C, 64 bits
swapping
I, 64 bits
DEA, decrypt
DEA, encrypt
DEA, decrypt
O, 64 bits
swapping
P, 64 bits
OUT FIFO
plaintext P
RM0033
ai16069b
MS19021V1