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check_nonce_nc(): fixed missing set of the bit for the old 'nc' value

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When 'nc' values are increased sequentially, the bit for the old 'nc'
value was not set.
This commit is contained in:
Evgeny Grin (Karlson2k)
2022-05-01 16:44:53 +03:00
parent 8457dfc7b6
commit f473462465
1 changed files with 10 additions and 2 deletions
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src/microhttpd/digestauth.c
+10 -2
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@@ -634,8 +634,16 @@ check_nonce_nc (struct MHD_Connection *connection,
else
{
/* 'nc' is larger, shift bitmask and bump limit */
if (64 > nc - nn->nc)
nn->nmask <<= (nc - nn->nc); /* small jump, less than mask width */
const uint64_t jump_size = nc - nn->nc;
if (64 > jump_size)
{
/* small jump, less than mask width */
nn->nmask <<= jump_size;
/* Set bit for the old 'nc' value */
nn->nmask |= (UINT64_C (1) << (jump_size - 1));
}
else if (64 == jump_size)
nn->nmask = (UINT64_C (1) << 63);
else
nn->nmask = 0; /* big jump, unset all bits in the mask */
nn->nc = nc;