AES override feature

Author: fireice-uk

config.txt

@@ -76,6 +76,16 @@ null,
  */
 "nicehash_nonce" : false,
 
+/*
+ * Manual hardware AES override
+ *
+ * Some VMs don't report AES capability correctly. You can set this value to true to make the miner use hardware
+ * AES or to false to make it use software AES.
+ * 
+ * WARNING: setting this to true on a CPU that doesn't support hardware AES will crash the miner.
+ */
+"aes_override" : null,
+
 /*
  * TLS Settings
  * If you need real security, make sure tls_secure_algo is enabled (otherwise MITM attack can downgrade encryption

jconf.cpp

@@ -45,7 +45,7 @@ using namespace rapidjson;
 /*
  * This enum needs to match index in oConfigValues, otherwise we will get a runtime error
  */
-enum configEnum { aCpuThreadsConf, sUseSlowMem, bNiceHashMode,
+enum configEnum { aCpuThreadsConf, sUseSlowMem, bNiceHashMode, bAesOverride,
 	bTlsMode, bTlsSecureAlgo, sTlsFingerprint, sPoolAddr, sWalletAddr, sPoolPwd,
 	iCallTimeout, iNetRetry, iGiveUpLimit, iVerboseLevel, iAutohashTime,
 	bDaemonMode, sOutputFile, iHttpdPort, bPreferIpv4 };
@@ -62,6 +62,7 @@ configVal oConfigValues[] = {
 	{ aCpuThreadsConf, "cpu_threads_conf", kNullType },
 	{ sUseSlowMem, "use_slow_memory", kStringType },
 	{ bNiceHashMode, "nicehash_nonce", kTrueType },
+	{ bAesOverride, "aes_override", kNullType },
 	{ bTlsMode, "use_tls", kTrueType },
 	{ bTlsSecureAlgo, "tls_secure_algo", kTrueType },
 	{ sTlsFingerprint, "tls_fingerprint", kStringType },
@@ -453,11 +454,14 @@ bool jconf::parse_config(const char* sFilename)
 
 	printer::inst()->set_verbose_level(prv->configValues[iVerboseLevel]->GetUint64());
 
-	if(!NeedsAutoconf())
-	{
-		if(!bHaveAes)
-			printer::inst()->print_msg(L0, "Your CPU doesn't support hardware AES. Don't expect high hashrates.");
-	}
+	if(NeedsAutoconf())
+		return true;
+
+	if(prv->configValues[bAesOverride]->IsBool())
+		bHaveAes = prv->configValues[bAesOverride]->GetBool();
+
+	if(!bHaveAes)
+		printer::inst()->print_msg(L0, "Your CPU doesn't support hardware AES. Don't expect high hashrates.");
 
 	return true;
 }