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sha256.c: muted alignment warnings

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This commit is contained in:
Evgeny Grin (Karlson2k)
2022-04-25 16:05:13 +03:00
parent 2a01697de4
commit 5da78f9d8d
1 changed files with 14 additions and 9 deletions
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src/microhttpd/sha256.c
+14 -9
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@@ -136,8 +136,11 @@ sha256_transform (uint32_t H[_SHA256_DIGEST_LENGTH],
See FIPS PUB 180-4 paragraph 6.2.
Input data must be read in big-endian bytes order,
see FIPS PUB 180-4 paragraph 3.1.2. */
/* Use cast to (const void*) to mute compiler alignment warning,
* data was already aligned in previous step */
#define GET_W_FROM_DATA(buf,t) \
_MHD_GET_32BIT_BE (((const uint8_t*) (buf)) + (t) * SHA256_BYTES_IN_WORD)
_MHD_GET_32BIT_BE ((const void*)(((const uint8_t*) (buf)) + \
(t) * SHA256_BYTES_IN_WORD))
/* During first 16 steps, before making any calculations on each step,
the W element is read from input data buffer as big-endian value and
@@ -432,14 +435,16 @@ MHD_SHA256_finish (void *ctx_,
if (1)
#endif /* _MHD_PUT_32BIT_BE_UNALIGNED */
{
_MHD_PUT_32BIT_BE (digest + 0 * SHA256_BYTES_IN_WORD, ctx->H[0]);
_MHD_PUT_32BIT_BE (digest + 1 * SHA256_BYTES_IN_WORD, ctx->H[1]);
_MHD_PUT_32BIT_BE (digest + 2 * SHA256_BYTES_IN_WORD, ctx->H[2]);
_MHD_PUT_32BIT_BE (digest + 3 * SHA256_BYTES_IN_WORD, ctx->H[3]);
_MHD_PUT_32BIT_BE (digest + 4 * SHA256_BYTES_IN_WORD, ctx->H[4]);
_MHD_PUT_32BIT_BE (digest + 5 * SHA256_BYTES_IN_WORD, ctx->H[5]);
_MHD_PUT_32BIT_BE (digest + 6 * SHA256_BYTES_IN_WORD, ctx->H[6]);
_MHD_PUT_32BIT_BE (digest + 7 * SHA256_BYTES_IN_WORD, ctx->H[7]);
/* Use cast to (void*) here to mute compiler alignment warnings.
* Compilers are not smart enough to see that alignment has been checked. */
_MHD_PUT_32BIT_BE ((void *) (digest + 0 * SHA256_BYTES_IN_WORD), ctx->H[0]);
_MHD_PUT_32BIT_BE ((void *) (digest + 1 * SHA256_BYTES_IN_WORD), ctx->H[1]);
_MHD_PUT_32BIT_BE ((void *) (digest + 2 * SHA256_BYTES_IN_WORD), ctx->H[2]);
_MHD_PUT_32BIT_BE ((void *) (digest + 3 * SHA256_BYTES_IN_WORD), ctx->H[3]);
_MHD_PUT_32BIT_BE ((void *) (digest + 4 * SHA256_BYTES_IN_WORD), ctx->H[4]);
_MHD_PUT_32BIT_BE ((void *) (digest + 5 * SHA256_BYTES_IN_WORD), ctx->H[5]);
_MHD_PUT_32BIT_BE ((void *) (digest + 6 * SHA256_BYTES_IN_WORD), ctx->H[6]);
_MHD_PUT_32BIT_BE ((void *) (digest + 7 * SHA256_BYTES_IN_WORD), ctx->H[7]);
}
/* Erase potentially sensitive data. */