initial revision

1 files changed, 124 insertions, 0 deletions

diff --git a/pwmanager/pwmanager/randomizer.cpp b/pwmanager/pwmanager/randomizer.cpp
new file mode 100644
index 0000000..e623f51
--- a/dev/null
+++ b/pwmanager/pwmanager/randomizer.cpp
@@ -0,0 +1,124 @@
+/***************************************************************************
+ *                                                                         *
+ *   copyright (C) 2003, 2004 by Michael Buesch                            *
+ *   email: mbuesch@freenet.de                                             *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License version 2        *
+ *   as published by the Free Software Foundation.                         *
+ *                                                                         *
+ ***************************************************************************/
+
+/***************************************************************************
+ * copyright (C) 2004 by Ulf Schenk
+ * This file is originaly based on version 1.0.1 of pwmanager
+ * and was modified to run on embedded devices that run microkde
+ *
+ * $Id$
+ **************************************************************************/  
+
+#include "randomizer.h"
+#include "pwmexception.h"
+
+#include <stdlib.h>
+#include <time.h>
+
+
+Randomizer * Randomizer::rndObj (0);
+
+Randomizer::Randomizer()
+{
+	// probe for random devices
+	rndDev = fopen("/dev/urandom", "r");
+	if (rndDev)
+		return;
+	rndDev = fopen("/dev/random", "r");
+	if (rndDev)
+		return;
+	// fall back to rand_r()
+	seed = time(0);
+}
+
+Randomizer::~Randomizer()
+{
+	if (rndDev) {
+		if (fclose(rndDev)) {
+			printWarn("failed closing the random-device!");
+		}
+	}
+}
+
+char Randomizer::genRndChar()
+{
+	if (rndDev) {
+		/* we have a rand-device-node */
+		return (getc(rndDev));
+	} else {
+		/* we don't have a random-device-node.
+		 * so fall back to rand_r()
+		 */
+		return (rand_r(&seed) % 0xFF);
+	}
+}
+
+int Randomizer::genRndInt()
+{
+	if(rndDev) {
+		int ret;
+		if (sizeof(int) == 4) {
+			(reinterpret_cast<char *>(&ret))[0] = getc(rndDev);
+			(reinterpret_cast<char *>(&ret))[1] = getc(rndDev);
+			(reinterpret_cast<char *>(&ret))[2] = getc(rndDev);
+			(reinterpret_cast<char *>(&ret))[3] = getc(rndDev);
+		} else if (sizeof(int) == 8) {
+			(reinterpret_cast<char *>(&ret))[0] = getc(rndDev);
+			(reinterpret_cast<char *>(&ret))[1] = getc(rndDev);
+			(reinterpret_cast<char *>(&ret))[2] = getc(rndDev);
+			(reinterpret_cast<char *>(&ret))[3] = getc(rndDev);
+			(reinterpret_cast<char *>(&ret))[4] = getc(rndDev);
+			(reinterpret_cast<char *>(&ret))[5] = getc(rndDev);
+			(reinterpret_cast<char *>(&ret))[6] = getc(rndDev);
+			(reinterpret_cast<char *>(&ret))[7] = getc(rndDev);
+		} else {
+			printWarn(string(__FILE__) + ":" + tostr(__LINE__)
+				  + ":  sizeof(int) != 4 && sizeof(int) != 8");
+			rndDev = 0;
+			seed = time(0);
+			return genRndInt();
+		}
+		return ret;
+	} else {
+		return rand_r(&seed);
+	}
+}
+
+unsigned int Randomizer::genRndUInt()
+{
+	if(rndDev) {
+		unsigned int ret;
+		if (sizeof(unsigned int) == 4) {
+			(reinterpret_cast<char *>(&ret))[0] = getc(rndDev);
+			(reinterpret_cast<char *>(&ret))[1] = getc(rndDev);
+			(reinterpret_cast<char *>(&ret))[2] = getc(rndDev);
+			(reinterpret_cast<char *>(&ret))[3] = getc(rndDev);
+		} else if (sizeof(unsigned int) == 8) {
+			(reinterpret_cast<char *>(&ret))[0] = getc(rndDev);
+			(reinterpret_cast<char *>(&ret))[1] = getc(rndDev);
+			(reinterpret_cast<char *>(&ret))[2] = getc(rndDev);
+			(reinterpret_cast<char *>(&ret))[3] = getc(rndDev);
+			(reinterpret_cast<char *>(&ret))[4] = getc(rndDev);
+			(reinterpret_cast<char *>(&ret))[5] = getc(rndDev);
+			(reinterpret_cast<char *>(&ret))[6] = getc(rndDev);
+			(reinterpret_cast<char *>(&ret))[7] = getc(rndDev);
+		} else {
+			printWarn(string(__FILE__) + ":" + tostr(__LINE__)
+				  + ":  sizeof(unsigned int) != 4 && sizeof(unsigned int) != 8");
+			rndDev = 0;
+			seed = time(0);
+			return genRndUInt();
+		}
+		return ret;
+	} else {
+		return static_cast<unsigned int>(rand_r(&seed));
+	}
+}