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tls: fix CONFIG_FEATURE_TLS_SHA1=y + CONFIG_SHA1_HWACCEL=y 

The check for result hash size was buggy for CONFIG_SHA1_HWACCEL=y.

While at it, document CPUID use a bit better.

function                                             old     new   delta
get_shaNI                                              -      28     +28
sha1_end                                              66      79     +13
sha256_begin                                          83      60     -23
sha1_begin                                           111      88     -23
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 1/2 up/down: 41/-46)             Total: -5 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
master
Denys Vlasenko 2024-07-12 19:30:14 +02:00
parent 999e290ef6
commit 1ad2f5cd9f
1 changed files with 23 additions and 6 deletions
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29
libbb/hash_md5_sha.c
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@ -15,18 +15,28 @@
#if ENABLE_SHA1_HWACCEL || ENABLE_SHA256_HWACCEL
# if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
static void cpuid(unsigned *eax, unsigned *ebx, unsigned *ecx, unsigned *edx)
static void cpuid_eax_ebx_ecx(unsigned *eax, unsigned *ebx, unsigned *ecx, unsigned *edx)
{
asm ("cpuid"
: "=a"(*eax), "=b"(*ebx), "=c"(*ecx), "=d"(*edx)
: "0"(*eax), "1"(*ebx), "2"(*ecx), "3"(*edx)
: "0" (*eax), "1" (*ebx), "2" (*ecx)
);
}
static smallint shaNI;
static int get_shaNI(void)
static NOINLINE int get_shaNI(void)
{
unsigned eax = 7, ebx = ebx, ecx = 0, edx = edx;
cpuid(&eax, &ebx, &ecx, &edx);
/* Get leaf 7 subleaf 0. Exists on all CPUs since Merom (2006).
* "If a value entered for CPUID.EAX is higher than the maximum
* input value for basic or extended function for that processor
* then the data for the highest basic information leaf is returned".
* This means that Pentiums 4 would return leaf 5 or 6 instead of 7,
* which happen to have zero in EBX bit 29. Thus they should work too.
*/
unsigned eax = 7;
unsigned ecx = 0;
unsigned ebx = 0; /* should not be needed, paranoia */
unsigned edx;
cpuid_eax_ebx_ecx(&eax, &ebx, &ecx, &edx);
ebx = ((ebx >> 28) & 2) - 1; /* bit 29 -> 1 or -1 */
shaNI = (int)ebx;
return (int)ebx;
@ -1300,7 +1310,14 @@ unsigned FAST_FUNC sha1_end(sha1_ctx_t *ctx, void *resbuf)
/* SHA stores total in BE, need to swap on LE arches: */
common64_end(ctx, /*swap_needed:*/ BB_LITTLE_ENDIAN);
hash_size = (ctx->process_block == sha1_process_block64) ? 5 : 8;
hash_size = 8;
if (ctx->process_block == sha1_process_block64
#if ENABLE_SHA1_HWACCEL
|| ctx->process_block == sha1_process_block64_shaNI
#endif
) {
hash_size = 5;
}
/* This way we do not impose alignment constraints on resbuf: */
if (BB_LITTLE_ENDIAN) {
unsigned i;