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AES GMULT: add table implementation using 32-bit types

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32-bit ARM didn't load 64-bit pointers without alignment issues.
This commit is contained in:
Sean Parkinson 2023-09-06 08:47:48 +10:00
parent eda3cd6a37
commit 40c5048e38
1 changed files with 28 additions and 0 deletions
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28
wolfcrypt/src/aes.c
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@ -5129,6 +5129,34 @@ static void GMULT(byte *x, byte m[256][AES_BLOCK_SIZE])
xorbuf(Z, m[x[0]], AES_BLOCK_SIZE);
XMEMCPY(x, Z, AES_BLOCK_SIZE);
#elif defined(WC_32BIT_CPU)
byte Z[AES_BLOCK_SIZE + AES_BLOCK_SIZE];
byte a;
word32* pZ;
word32* pm;
int i;
pZ = (word32*)(Z + 15 + 1);
pm = (word32*)(m[x[15]]);
pZ[0] = pm[0];
pZ[1] = pm[1];
pZ[2] = pm[2];
pZ[3] = pm[3];
a = Z[16 + 15];
Z[15] = R[a][0];
Z[16] ^= R[a][1];
for (i = 14; i > 0; i--) {
pZ = (word32*)(Z + i + 1);
pm = (word32*)(m[x[i]]);
pZ[0] ^= pm[0];
pZ[1] ^= pm[1];
pZ[2] ^= pm[2];
pZ[3] ^= pm[3];
a = Z[16 + i];
Z[i] = R[a][0];
Z[i+1] ^= R[a][1];
}
xorbufout(x, Z+1, m[x[0]], AES_BLOCK_SIZE);
#else
byte Z[AES_BLOCK_SIZE + AES_BLOCK_SIZE];
byte a;