Figure 203. Des/Tdes-Ecb Mode Encryption; Figure 204. Des/Tdes-Ecb Mode Decryption - ST STM32F40 Series Reference Manual

Cryptographic processor (CRYP)

Figure 203. DES/TDES-ECB mode encryption

1. K: key; C: cipher text; I: input block; O: output block; P: plain text.

Figure 204. DES/TDES-ECB mode decryption

1. K: key; C: cipher text; I: input block; O: output block; P: plain text.
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IN FIFO
plaintext P
DATATYPE
swapping
64
DEA, encrypt
K1
64
DEA, decrypt
K2
64
DEA, encrypt
K3
DATATYPE
swapping
OUT FIFO
ciphertext C
IN FIFO
ciphertext C
DATATYPE
swapping
64
DEA, decrypt
K3
64
DEA, encrypt
K2
64
DEA, decrypt
K1
DATATYPE
swapping
OUT FIFO
plaintext P
Doc ID 018909 Rev 4
P, 64 bits
O, 64 bits
C, 64 bits
C, 64 bits
I, 64 bits
O, 64 bits
P, 64 bits
RM0090
ai16069b
MS19021V1