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return an error if the supplied precomputed values lead to an invalid signature

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This commit is contained in:
Nils Larsch
2006-10-04 19:37:17 +00:00
parent d326582cab
commit 2fc281d01f
3 changed files with 17 additions and 2 deletions
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15
crypto/ecdsa/ecs_ossl.c
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@@ -299,8 +299,21 @@ static ECDSA_SIG *ecdsa_do_sign(const unsigned char *dgst, int dgst_len,
ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_BN_LIB);
goto err;
}
if (BN_is_zero(s))
{
/* if kinv and r have been supplied by the caller
* don't to generate new kinv and r values */
if (in_kinv != NULL && in_r != NULL)
{
ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ECDSA_R_NEED_NEW_SETUP_VALUES);
goto err;
}
}
else
/* s != 0 => we have a valid signature */
break;
}
while (BN_is_zero(s));
while (1);
ok = 1;
err: