Public key accelerator (PKA) RM0453
716/1450 RM0453 Rev 5
24.6 PKA interrupts
There are three individual maskable interrupt sources generated by the public key
accelerator, signaling the following events:
1. access to unmapped address (ADDRERRF), see Section 24.3.7
2. PKA RAM access while PKA operation is in progress (RAMERRF), see Section 24.3.7
3. PKA end of operation (PROCENDF)
The three interrupt sources are connected to the same global interrupt request signal pka_it.
The user can enable or disable above interrupt sources individually by changing the mask
bits in the PKA control register (PKA_CR). Setting the appropriate mask bit to 1 enables the
interrupt. The status of the individual interrupt events can be read from the PKA status
register (PKA_SR), and it is cleared in PKA_CLRFR register.
Table 174 gives a summary of the available features.
Table 171. ECDSA verification average computation times
Modulus length (in bits)
160 192 256 320 384 512 521
3500000 5350000 10498000 18126000 29118000 61346000 71588000
Table 172. Point on elliptic curve Fp check average computation times
Modulus length (in bits)
160 192 256 320 384 512
10800 14200 20400 31000 49600 82400
Table 173. Montgomery parameters average computation times
(1)
1. The computation times depend upon the length and the value of the modulus, hence these values are
average execution times of random moduli of given length.
Modulus length (in bits)
160 192 256 320 384 512 521 1024 2048 3072
4518 7846 11848 14902 21682 35012 64000 119536 466146 1104642
Table 174. PKA interrupt requests
Interrupt
acronym
Interrupt event Event flag Enable control bit Interrupt clear method
PKA
Access to unmapped address error ADDRERRF ADDRERRIE Set ADDRERRFC bit
PKA RAM access error RAMERRF RAMERRIE Set RAMERRFC bit
PKA end of operation PROCENDF PROCENDIE Set PROCENDFC bit
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