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AES CTR-DRGB: do not leak timing information

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Signed-off-by: Patrick Steuer <patrick.steuer@de.ibm.com>

Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/11147)
This commit is contained in:
Patrick Steuer 2020-02-22 01:20:09 +01:00 committed by Pauli
parent 96218269f4
commit 069165d106
1 changed files with 8 additions and 12 deletions
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20
crypto/rand/drbg_ctr.c
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@ -21,19 +21,15 @@
*/
static void inc_128(RAND_DRBG_CTR *ctr)
{
int i;
unsigned char c;
unsigned char *p = &ctr->V[15];
unsigned char *p = &ctr->V[0];
u32 n = 16, c = 1;
for (i = 0; i < 16; i++, p--) {
c = *p;
c++;
*p = c;
if (c != 0) {
/* If we didn't wrap around, we're done. */
break;
}
}
do {
--n;
c += p[n];
p[n] = (u8)c;
c >>= 8;
} while (n);
}
static void ctr_XOR(RAND_DRBG_CTR *ctr, const unsigned char *in, size_t inlen)