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Read pi table in 4-byte chunks

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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Dave Rodgman 2024-02-13 18:35:41 +00:00
parent d407e0df1b
commit cfb126f1ba
1 changed files with 9 additions and 5 deletions
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14
library/sha3.c
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@ -39,9 +39,8 @@ static const uint32_t rho[6] = {
0x3f022425, 0x1c143a09, 0x2c3d3615, 0x27191713, 0x312b382e, 0x3e030832
};
static const uint8_t pi[24] = {
10, 7, 11, 17, 18, 3, 5, 16, 8, 21, 24, 4,
15, 23, 19, 13, 12, 2, 20, 14, 22, 9, 6, 1,
static const uint32_t pi[6] = {
0x0a070b11, 0x12030510, 0x08151804, 0x0f17130d, 0x0c02140e, 0x16090601
};
#define ROTR64(x, y) (((x) << (64U - (y))) | ((x) >> (y))) // 64-bit rotate right
@ -94,8 +93,13 @@ static void keccak_f1600(mbedtls_sha3_context *ctx)
/* Pi */
t = s[1];
for (i = 0; i < 24; i++) {
SWAP(s[pi[i]], t);
for (i = 0; i < 24; i += 4) {
uint32_t p = pi[i >> 2];
for (unsigned j = 0; j < 4; j++) {
uint8_t p8 = (uint8_t) (p >> 24);
p <<= 8;
SWAP(s[p8], t);
}
}
/* Chi */