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AES-GCM small ARM asm: add back implementation

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Implementation of GCM mult with length for ARM asm and small GCM was
added to armv8-aes.c but got lost when code pulled back to aes.c.
This commit is contained in:
Sean Parkinson
2025-11-24 11:08:18 +10:00
parent 59f4fa5686
commit ba47f7f333
1 changed files with 29 additions and 2 deletions
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31
wolfcrypt/src/aes.c
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@@ -7459,8 +7459,35 @@ void GHASH(Gcm* gcm, const byte* a, word32 aSz, const byte* c,
#endif /* WOLFSSL_AESGCM_STREAM */
#ifdef WOLFSSL_ARMASM
#define GCM_GMULT_LEN(gcm, x, a, len) \
GCM_gmult_len(x, (const byte**)((gcm)->M0), a, len)
static void GCM_gmult_len(byte* x, const byte* h, const unsigned char* a,
unsigned long len)
{
byte Z[AES_BLOCK_SIZE];
byte V[AES_BLOCK_SIZE];
int i;
int j;
while (len >= AES_BLOCK_SIZE) {
xorbuf(x, a, AES_BLOCK_SIZE);
XMEMSET(Z, 0, AES_BLOCK_SIZE);
XMEMCPY(V, x, AES_BLOCK_SIZE);
for (i = 0; i < AES_BLOCK_SIZE; i++) {
byte y = h[i];
for (j = 0; j < 8; j++) {
if (y & 0x80) {
xorbuf(Z, V, AES_BLOCK_SIZE);
}
RIGHTSHIFTX(V);
y = y << 1;
}
}
XMEMCPY(x, Z, AES_BLOCK_SIZE);
len -= AES_BLOCK_SIZE;
a += AES_BLOCK_SIZE;
}
}
#define GCM_GMULT_LEN(gcm, x, a, len) GCM_gmult_len(x, (gcm)->H, a, len)
#endif
#elif defined(GCM_TABLE)