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Read rho 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 18:27:55 +00:00
parent 255a0f5916
commit d407e0df1b
1 changed files with 9 additions and 4 deletions
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13
library/sha3.c
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@ -35,8 +35,8 @@ static const uint64_t rc[24] = {
0x8000000080008081, 0x8000000000008080, 0x0000000080000001, 0x8000000080008008,
};
static const uint8_t rho[24] = {
63, 2, 36, 37, 28, 20, 58, 9, 44, 61, 54, 21, 39, 25, 23, 19, 49, 43, 56, 46, 62, 3, 8, 50
static const uint32_t rho[6] = {
0x3f022425, 0x1c143a09, 0x2c3d3615, 0x27191713, 0x312b382e, 0x3e030832
};
static const uint8_t pi[24] = {
@ -83,8 +83,13 @@ static void keccak_f1600(mbedtls_sha3_context *ctx)
s[4] ^= t; s[9] ^= t; s[14] ^= t; s[19] ^= t; s[24] ^= t;
/* Rho */
for (i = 1; i < 25; i++) {
s[i] = ROTR64(s[i], rho[i-1]);
for (i = 1; i < 25; i += 4) {
uint32_t r = rho[(i - 1) >> 2];
for (int j = i; j < i + 4; j++) {
uint8_t r8 = r >> 24;
r <<= 8;
s[j] = ROTR64(s[j], r8);
}
}
/* Pi */