Commit 09fbf7c0 authored by Jarod Wilson's avatar Jarod Wilson Committed by Herbert Xu

crypto: ansi_cprng - fix inverted DT increment routine

The ANSI X9.31 PRNG docs aren't particularly clear on how to increment DT,
but empirical testing shows we're incrementing from the wrong end. A 10,000
iteration Monte Carlo RNG test currently winds up not getting the expected
result.

From http://csrc.nist.gov/groups/STM/cavp/documents/rng/RNGVS.pdf :

# CAVS 4.3
# ANSI931 MCT
[X9.31]
[AES 128-Key]

COUNT = 0
Key = 9f5b51200bf334b5d82be8c37255c848
DT = 6376bbe52902ba3b67c925fa701f11ac
V = 572c8e76872647977e74fbddc49501d1
R = 48e9bd0d06ee18fbe45790d5c3fc9b73

Currently, we get 0dd08496c4f7178bfa70a2161a79459a after 10000 loops.

Inverting the DT increment routine results in us obtaining the expected result
of 48e9bd0d06ee18fbe45790d5c3fc9b73. Verified on both x86_64 and ppc64.
Signed-off-by: default avatarJarod Wilson <jarod@redhat.com>
Acked-by: default avatarNeil Horman <nhorman@tuxdriver.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 93027354
...@@ -161,7 +161,7 @@ static int _get_more_prng_bytes(struct prng_context *ctx) ...@@ -161,7 +161,7 @@ static int _get_more_prng_bytes(struct prng_context *ctx)
/* /*
* Now update our DT value * Now update our DT value
*/ */
for (i = 0; i < DEFAULT_BLK_SZ; i++) { for (i = DEFAULT_BLK_SZ - 1; i >= 0; i--) {
ctx->DT[i] += 1; ctx->DT[i] += 1;
if (ctx->DT[i] != 0) if (ctx->DT[i] != 0)
break; break;
......
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