Let's make (git) history!

random.h

@@ -0,0 +1,53 @@
+#ifndef RANDOM_H
+#define RANDOM_H
+#include <unistd.h>
+#include <sys/syscall.h>
+#ifdef __linux__
+#include <linux/random.h>
+#endif
+#ifndef SYS_getrandom
+#include <openssl/rand.h>
+#endif
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <string>
+
+// dirty hacks
+#ifdef SYS_getrandom
+inline int getrandom(void *buf, size_t buflen, unsigned int flags)
+{
+	return syscall(SYS_getrandom, buf, buflen, flags);
+}
+#else
+
+#if __linux__
+// ancient linux systems
+#define GRND_NONBLOCK 0
+inline int getrandom(void *buf, size_t buflen, unsigned int flags)
+{
+	int result = RAND_bytes(buf, buflen);
+	if(result == 1)
+	{
+		return (int)buflen;
+	}
+	return -1;
+}
+#endif
+#if __OpenBSD__
+inline int getrandom(void *buf, size_t buflen, unsigned int flags)
+{
+	arc4random_buf(buf, buflen);
+	return 0;
+}
+#endif
+#endif
+/* TODO: if the >=C++11 prngr are good enough, use them */
+class Random
+{
+  public:
+	Random();
+	std::string getRandomHexString(unsigned int bytes);
+};
+
+#endif // RANDOM_H