Get entropy from platform's native source.

src/PlatRand.cpp

@@ -13,12 +13,26 @@ bool AddSystemEntropy()
 	HCRYPTOPROV cryptoHandle;
 
 	if (!CryptGetDefaultProvider(PROV_RSA_FULL, NULL, CRYPT_MACHINE_DEFAULT, name, &count))
+	{
+#ifdef DEBUG
+		std::cerr << "Unable to get default crypto provider" << std::endl;
+#endif
 		return false;
+	}
+
 	if (!CryptAcquireContext(&cryptoHandle, NULL, name, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT | CRYPT_SILENT))
+	{
+#ifdef DEBUG
+		std::cerr << "Unable to acquire crypto provider" << std::endl;
+#endif
 		return false;
+	}
 
 	if(!CryptGenRandom(cryptoHandle, 128, reinterpret_cast<BYTE*>(rand)))
 	{
+#ifdef DEBUG
+		std::cerr << "Unable to get entropy from crypto provider" << std::endl;
+#endif
 		CryptReleaseContext(cryptoHandle, 0);
 		return false;
 	}
@@ -30,9 +44,36 @@ bool AddSystemEntropy()
 
 #else
 
+#include <iostream>
+#include <fstream>
+
+#include <openssl/rand.h>
+
 bool AddSystemEntropy()
-{ // Stub for implementing on other platforms
-	return false;
+{
+	char rand[128];
+	std::ifstream reader;
+
+	reader.open("/dev/urandom", std::ios::in | std::ios::binary);
+	if (!reader.is_open())
+	{
+#ifdef DEBUG
+		std::cerr << "Unable to open random source" << std::endl;
+#endif
+		return false;
+	}
+	reader.read(rand, 128);
+
+	int bytesRead = reader.gcount();
+	if (bytesRead == 0)
+	{
+#ifdef DEBUG
+		std::cerr << "Unable to read from random source" << std::endl;
+#endif
+		return false;
+	}
+	RAND_seed(rand, bytesRead);
+	return bytesRead >= 64;
 }
 
 #endif

src/main.cpp

@@ -1,9 +1,13 @@
+
 #include "Application.h"
+
 #include <iostream>
+
 #include "CallRPC.h"
 #include "Config.h"
 
 extern void runTests();
+extern bool AddSystemEntropy();
 using namespace std;
 using namespace boost;
 
@@ -50,9 +54,16 @@ int parseCommandline(int argc, char* argv[])
 
 	theConfig.load();
 
+	if (!AddSystemEntropy())
+	{
+#ifdef DEBUG
+		std::cerr << "Unable to add system entropy" << std::endl;
+#endif
+	}
+
 	if(argc>1)
 	{
-		ret=commandLineRPC(argc, argv);
+		ret = commandLineRPC(argc, argv);
 		if(ret)
 			printHelp();
 	}
@@ -66,6 +77,6 @@ int main(int argc, char* argv[])
 {
 //	runTests();
 
-	return(parseCommandline(argc,argv));
+	return(parseCommandline(argc, argv));
 }
 // vim:ts=4