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Check the return from BN_sub() in BN_X931_generate_Xpq().

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Reviewed-by: Tim Hudson <tjh@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/7088)
This commit is contained in:
Pauli 2018-09-03 07:37:38 +10:00
parent a8d3dbe19b
commit 6bcfcf16bf
1 changed files with 3 additions and 1 deletions
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4
crypto/bn/bn_x931p.c
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@ -184,8 +184,10 @@ int BN_X931_generate_Xpq(BIGNUM *Xp, BIGNUM *Xq, int nbits, BN_CTX *ctx)
for (i = 0; i < 1000; i++) {
if (!BN_priv_rand(Xq, nbits, BN_RAND_TOP_TWO, BN_RAND_BOTTOM_ANY))
goto err;
/* Check that |Xp - Xq| > 2^(nbits - 100) */
BN_sub(t, Xp, Xq);
if (!BN_sub(t, Xp, Xq))
goto err;
if (BN_num_bits(t) > (nbits - 100))
break;
}