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target/arm: Fix PAuth sbox functions

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In the PAC computation, sbox was applied over wrong bits.
As this is a 4-bit sbox, bit index should be incremented by 4 instead of 16.

Test vector from QARMA paper (https://eprint.iacr.org/2016/444.pdf) was
used to verify one computation of the pauth_computepac() function which
uses sbox2.

Launchpad: https://bugs.launchpad.net/bugs/1859713

Backports commit de0b1bae6461f67243282555475f88b2384a1eb9 from qemu
This commit is contained in:
Vincent Dehors 2020-03-21 12:17:15 -04:00 committed by Lioncash
parent 1d97d223c3
commit 6127f08028
1 changed files with 2 additions and 2 deletions
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4
qemu/target/arm/pauth_helper.c
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@ -89,7 +89,7 @@ static uint64_t pac_sub(uint64_t i)
uint64_t o = 0;
int b;
for (b = 0; b < 64; b += 16) {
for (b = 0; b < 64; b += 4) {
o |= (uint64_t)sub[(i >> b) & 0xf] << b;
}
return o;
@ -104,7 +104,7 @@ static uint64_t pac_inv_sub(uint64_t i)
uint64_t o = 0;
int b;
for (b = 0; b < 64; b += 16) {
for (b = 0; b < 64; b += 4) {
o |= (uint64_t)inv_sub[(i >> b) & 0xf] << b;
}
return o;