checking in all the old panacean stuff

puttysrc/UNIX/UXNOISE.C

@@ -0,0 +1,127 @@
+/*
+ * Noise generation for PuTTY's cryptographic random number
+ * generator.
+ */
+
+#include <stdio.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+
+#include "putty.h"
+#include "ssh.h"
+#include "storage.h"
+
+static int read_dev_urandom(char *buf, int len)
+{
+    int fd;
+    int ngot, ret;
+
+    fd = open("/dev/urandom", O_RDONLY);
+    if (fd < 0)
+	return 0;
+
+    ngot = 0;
+    while (ngot < len) {
+	ret = read(fd, buf+ngot, len-ngot);
+	if (ret < 0) {
+	    close(fd);
+	    return 0;
+	}
+	ngot += ret;
+    }
+
+    return 1;
+}
+
+/*
+ * This function is called once, at PuTTY startup. It will do some
+ * slightly silly things such as fetching an entire process listing
+ * and scanning /tmp, load the saved random seed from disk, and
+ * also read 32 bytes out of /dev/urandom.
+ */
+
+void noise_get_heavy(void (*func) (void *, int))
+{
+    char buf[512];
+    FILE *fp;
+    int ret;
+
+    if (read_dev_urandom(buf, 32))
+	func(buf, 32);
+
+    fp = popen("ps -axu 2>/dev/null", "r");
+    while ( (ret = fread(buf, 1, sizeof(buf), fp)) > 0)
+	func(buf, ret);
+    pclose(fp);
+
+    fp = popen("ls -al /tmp 2>/dev/null", "r");
+    while ( (ret = fread(buf, 1, sizeof(buf), fp)) > 0)
+	func(buf, ret);
+    pclose(fp);
+
+    read_random_seed(func);
+    random_save_seed();
+}
+
+void random_save_seed(void)
+{
+    int len;
+    void *data;
+
+    if (random_active) {
+	random_get_savedata(&data, &len);
+	write_random_seed(data, len);
+	sfree(data);
+    }
+}
+
+/*
+ * This function is called every time the random pool needs
+ * stirring, and will acquire the system time.
+ */
+void noise_get_light(void (*func) (void *, int))
+{
+    struct timeval tv;
+    gettimeofday(&tv, NULL);
+    func(&tv, sizeof(tv));
+}
+
+/*
+ * This function is called on a timer, and grabs as much changeable
+ * system data as it can quickly get its hands on.
+ */
+void noise_regular(void)
+{
+    int fd;
+    int ret;
+    char buf[512];
+    struct rusage rusage;
+
+    if ((fd = open("/proc/meminfo", O_RDONLY)) >= 0) {
+	while ( (ret = read(fd, buf, sizeof(buf))) > 0)
+	    random_add_noise(buf, ret);
+	close(fd);
+    }
+    if ((fd = open("/proc/stat", O_RDONLY)) >= 0) {
+	while ( (ret = read(fd, buf, sizeof(buf))) > 0)
+	    random_add_noise(buf, ret);
+	close(fd);
+    }
+    getrusage(RUSAGE_SELF, &rusage);
+    random_add_noise(&rusage, sizeof(rusage));
+}
+
+/*
+ * This function is called on every keypress or mouse move, and
+ * will add the current time to the noise pool. It gets the scan
+ * code or mouse position passed in, and adds that too.
+ */
+void noise_ultralight(unsigned long data)
+{
+    struct timeval tv;
+    gettimeofday(&tv, NULL);
+    random_add_noise(&tv, sizeof(tv));
+    random_add_noise(&data, sizeof(data));
+}