From: Vincent Dehors <vincent.deh...@smile.fr> 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 Reviewed-by: Richard Henderson <richard.hender...@linaro.org> Signed-off-by: Vincent DEHORS <vincent.deh...@smile.fr> Signed-off-by: Adrien GRASSEIN <adrien.grass...@smile.fr> --- target/arm/pauth_helper.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/target/arm/pauth_helper.c b/target/arm/pauth_helper.c index d3194f2043..0a5f41e10c 100644 --- a/target/arm/pauth_helper.c +++ b/target/arm/pauth_helper.c @@ -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; -- 2.20.1
