RM0090: Reference manual - STMicroelectronics

Cryptographic processor (CRYP) RM0090
Figure 214. 64-bit block construction according to DATATYPE
bit swapping operation
IN FIFO
bit string M1 M2 M30 M31 M32
byte swapping operation
Byte 1,3 Byte 1,2
bits 7...0 bits 7...0
IN FIFO
Byte 0,3 Byte 0,2
bits 7...0 bits 7...0
bit string
hald-word swapping operation
IN FIFO
bit string
IN FIFO
bit string
bit 31
bit 31
bit 30
bit 30
Half-word 1,1
bits 15...0
Half-word 0,1
bits 15...0
Half-word 0,0
M1...16
bit 2
bit 2
Byte 1,1
bits 7...0
Byte 0,1
bits 7...0
bit 1
bit 1
Byte 1,0
bits 7...0
Byte 0,0
bits 7...0
Half-word 1,0
bits 15...0
Half-word 0,0
bits 15...0
Half-word 0,1
M17...32
bit 0
bit 0
Byte 0,0 Byte 0,1 Byte 0,2 Byte 0,3 Byte 1,0 Byte 1,1
M1...8 M9...16 M17...24 M25...32 M33...40 M41...48
20.3.4 Initialization vectors - CRYP_IV0...1(L/R)
Initialization vectors are considered as two 64-bit data items. They therefore do not have the
same data format and representation in system memory as plaintext or cypher data, and
they are not affected by the DATATYPE value.
Initialization vectors are defined by two consecutive 32-bit words, CRYP_IVL (left part, noted
as bits IV1...32) and CRYP_IVR (right part, noted as bits IV33...64).
565/1416 Doc ID 018909 Rev 3
DATATYPE = 11b
second word written into the CRYP_DIN register
first word written into the CRYP_DIN register
M33 M34 M62 M63 M64
DATATYPE = 10b
second word written into the CRYP_DIN register
first word written into the CRYP_DIN register
(bit ordering within byte is unchanged)
Byte 1,2
M49...56
DATATYPE = 01b
Byte 1,3
M57...64
second word written into the CRYP_DIN register
first word written into the CRYP_DIN register
Half-word 1,0
M33...48
Half-word 1,1
M49...64
No swapping operation DATATYPE = 00b
Word 1
bits 31...0
Word 0
bits 31...0
Word 0
M1...32
second word written into the CRYP_DIN register
first word written into the CRYP_DIN register
Word 1
M33...64
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