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bn_exp.c: improve portability.

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This commit is contained in:
Andy Polyakov 2011-08-27 19:38:55 +00:00
parent f7eb0ab9ac
commit cfdbff23ab
1 changed files with 6 additions and 1 deletions
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7
crypto/bn/bn_exp.c
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@ -654,16 +654,21 @@ int BN_mod_exp_mont_consttime(BIGNUM *rr, const BIGNUM *a, const BIGNUM *p,
numPowers = 1 << window; numPowers = 1 << window;
powerbufLen = sizeof(m->d[0])*(top*numPowers + powerbufLen = sizeof(m->d[0])*(top*numPowers +
(top>numPowers?top:numPowers)); (top>numPowers?top:numPowers));
#ifdef alloca
if (powerbufLen < 3072) if (powerbufLen < 3072)
powerbufFree = alloca(powerbufLen+MOD_EXP_CTIME_MIN_CACHE_LINE_WIDTH); powerbufFree = alloca(powerbufLen+MOD_EXP_CTIME_MIN_CACHE_LINE_WIDTH);
else if ((powerbufFree=(unsigned char*)OPENSSL_malloc(powerbufLen+MOD_EXP_CTIME_MIN_CACHE_LINE_WIDTH)) == NULL) else
#endif
if ((powerbufFree=(unsigned char*)OPENSSL_malloc(powerbufLen+MOD_EXP_CTIME_MIN_CACHE_LINE_WIDTH)) == NULL)
goto err; goto err;
powerbuf = MOD_EXP_CTIME_ALIGN(powerbufFree); powerbuf = MOD_EXP_CTIME_ALIGN(powerbufFree);
memset(powerbuf, 0, powerbufLen); memset(powerbuf, 0, powerbufLen);
#ifdef alloca
if (powerbufLen < 3072) if (powerbufLen < 3072)
powerbufFree = NULL; powerbufFree = NULL;
#endif
computeTemp.d = (BN_ULONG *)(powerbuf + sizeof(m->d[0])*top*numPowers); computeTemp.d = (BN_ULONG *)(powerbuf + sizeof(m->d[0])*top*numPowers);
computeTemp.top = computeTemp.dmax = top; computeTemp.top = computeTemp.dmax = top;