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chacha20poly1305: uses native unaligned 32-bit little-endian loads/st… #257

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Merged
utelle merged 2 commits into from
Sep 3, 2026
Merged

chacha20poly1305: uses native unaligned 32-bit little-endian loads/st… #257

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b93a91f
chacha20poly1305: uses native unaligned 32-bit little-endian loads/st…
matbech Sep 3, 2026
10f6fb4
Added check for_MSC_VER
matbech Sep 3, 2026
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41 changes: 30 additions & 11 deletions src/chacha20poly1305.c
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Original file line number Diff line number Diff line change
Expand Up @@ -13,24 +13,43 @@
#define ROL32(x, c) (((x) << (c)) | ((x) >> (32-(c))))
#define ROR32(x, c) (((x) >> (c)) | ((x) << (32-(c))))

#define LOAD32_LE(p) \
( ((uint32_t)((p)[0]) << 0) \
| ((uint32_t)((p)[1]) << 8) \
| ((uint32_t)((p)[2]) << 16) \
| ((uint32_t)((p)[3]) << 24) \
)
static inline uint32_t load32_le_(const void* p)
{
#if defined(__wasm__) || defined(_MSC_VER) \
|| (defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
uint32_t v;
memcpy(&v, p, 4);
return v;
#else
const uint8_t* b = (const uint8_t*)p;
return (uint32_t)b[0] | (uint32_t)b[1] << 8
| (uint32_t)b[2] << 16 | (uint32_t)b[3] << 24;
#endif
}

static inline void store32_le_(void* p, uint32_t v)
{
#if defined(__wasm__) || defined(_MSC_VER) \
|| (defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
memcpy(p, &v, 4);
#else
uint8_t* b = (uint8_t*)p;
b[0] = (uint8_t)(v);
b[1] = (uint8_t)(v >> 8);
b[2] = (uint8_t)(v >> 16);
b[3] = (uint8_t)(v >> 24);
#endif
}

#define LOAD32_LE(p) load32_le_(p)
#define LOAD32_BE(p) \
( ((uint32_t)((p)[3]) << 0) \
| ((uint32_t)((p)[2]) << 8) \
| ((uint32_t)((p)[1]) << 16) \
| ((uint32_t)((p)[0]) << 24) \
)

#define STORE32_LE(p, v) \
(p)[0] = ((v) >> 0) & 0xFF; \
(p)[1] = ((v) >> 8) & 0xFF; \
(p)[2] = ((v) >> 16) & 0xFF; \
(p)[3] = ((v) >> 24) & 0xFF;
#define STORE32_LE(p, v) store32_le_((p), (v))
#define STORE32_BE(p, v) \
(p)[3] = ((v) >> 0) & 0xFF; \
(p)[2] = ((v) >> 8) & 0xFF; \
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