Table 168. Modular Exponentiation Computation Times; Table 169. Ecc Scalar Multiplication Computation Times; Table 170. Ecdsa Signature Average Computation Times - ST STM32WL55JC Reference Manual

Public key accelerator (PKA)
24.7 PKA registers
24.7.1 PKA control register (PKA_CR)
Address offset: 0x00
Reset value: 0x0000 0000
31 30 29 28
Res. Res. Res. Res.
15 14 13 12
Res. Res.
rw rw
Bits 31:21 Reserved, must be kept at reset value.
Bit 20 ADDRERRIE: Address error interrupt enable
0: No interrupt is generated when ADDRERRF flag is set in PKA_SR.
1: An interrupt is generated when ADDRERRF flag is set in PKA_SR.
Bit 19 RAMERRIE: RAM error interrupt enable
0: No interrupt is generated when RAMERRF flag is set in PKA_SR.
1: An interrupt is generated when RAMERRF flag is set in PKA_SR.
Bit 18 Reserved, must be kept at reset value.
Bit 17 PROCENDIE: End of operation interrupt enable
0: No interrupt is generated when PROCENDF flag is set in PKA_SR.
1: An interrupt is generated when PROCENDF flag is set in PKA_SR.
Bits 16:14 Reserved, must be kept at reset value.
Bits 13:8 MODE[5:0]: PKA operation code
000000: Montgomery parameter computation then modular exponentiation
000001: Montgomery parameter computation only
000010: Modular exponentiation only (Montgomery parameter must be loaded first)
100000: Montgomery parameter computation then ECC scalar multiplication
100010: ECC scalar multiplication only (Montgomery parameter must be loaded first)
100100: ECDSA sign
100110: ECDSA verification
101000: Point on elliptic curve Fp check
000111: RSA CRT exponentiation
001000: Modular inversion
001001: Arithmetic addition
001010: Arithmetic subtraction
001011: Arithmetic multiplication
001100: Arithmetic comparison
001101: Modular reduction
001110: Modular addition
001111: Modular subtraction
010000: Montgomery multiplication
Others: Reserved
718/1454
27 26 25 24
Res. Res. Res. Res.
11 10 9 8
MODE[5:0]
rw rw rw rw
RM0453 Rev 2
23 22 21 20
ADDR
Res. Res. Res.
ERRIE
rw
7 6 5 4
Res. Res. Res. Res.
RM0453
19 18 17
RAM PROC
Res. Res.
ERRIE ENDIE
rw rw
3 2 1
Res. Res. START
rw
16
0
EN
rw