Now that we have Subversion's file renaming ability, it's time at

[sgt/putty] / windows / winnoise.c

diff --git a/windows/winnoise.c b/windows/winnoise.c
new file mode 100644 (file)
index 0000000..1b1d1f5
--- /dev/null
+++ b/windows/winnoise.c
@@ -0,0 +1,124 @@
+/*
+ * Noise generation for PuTTY's cryptographic random number
+ * generator.
+ */
+
+#include <stdio.h>
+
+#include "putty.h"
+#include "ssh.h"
+#include "storage.h"
+
+/*
+ * This function is called once, at PuTTY startup, and will do some
+ * seriously silly things like listing directories and getting disk
+ * free space and a process snapshot.
+ */
+
+void noise_get_heavy(void (*func) (void *, int))
+{
+    HANDLE srch;
+    WIN32_FIND_DATA finddata;
+    char winpath[MAX_PATH + 3];
+
+    GetWindowsDirectory(winpath, sizeof(winpath));
+    strcat(winpath, "\\*");
+    srch = FindFirstFile(winpath, &finddata);
+    if (srch != INVALID_HANDLE_VALUE) {
+       do {
+           func(&finddata, sizeof(finddata));
+       } while (FindNextFile(srch, &finddata));
+       FindClose(srch);
+    }
+
+    read_random_seed(func);
+    /* Update the seed immediately, in case another instance uses it. */
+    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 in all available
+ * forms and the battery status.
+ */
+void noise_get_light(void (*func) (void *, int))
+{
+    SYSTEMTIME systime;
+    DWORD adjust[2];
+    BOOL rubbish;
+
+    GetSystemTime(&systime);
+    func(&systime, sizeof(systime));
+
+    GetSystemTimeAdjustment(&adjust[0], &adjust[1], &rubbish);
+    func(&adjust, sizeof(adjust));
+}
+
+/*
+ * This function is called on a timer, and it will monitor
+ * frequently changing quantities such as the state of physical and
+ * virtual memory, the state of the process's message queue, which
+ * window is in the foreground, which owns the clipboard, etc.
+ */
+void noise_regular(void)
+{
+    HWND w;
+    DWORD z;
+    POINT pt;
+    MEMORYSTATUS memstat;
+    FILETIME times[4];
+
+    w = GetForegroundWindow();
+    random_add_noise(&w, sizeof(w));
+    w = GetCapture();
+    random_add_noise(&w, sizeof(w));
+    w = GetClipboardOwner();
+    random_add_noise(&w, sizeof(w));
+    z = GetQueueStatus(QS_ALLEVENTS);
+    random_add_noise(&z, sizeof(z));
+
+    GetCursorPos(&pt);
+    random_add_noise(&pt, sizeof(pt));
+
+    GlobalMemoryStatus(&memstat);
+    random_add_noise(&memstat, sizeof(memstat));
+
+    GetThreadTimes(GetCurrentThread(), times, times + 1, times + 2,
+                  times + 3);
+    random_add_noise(&times, sizeof(times));
+    GetProcessTimes(GetCurrentProcess(), times, times + 1, times + 2,
+                   times + 3);
+    random_add_noise(&times, sizeof(times));
+}
+
+/*
+ * This function is called on every keypress or mouse move, and
+ * will add the current Windows time and performance monitor
+ * counter to the noise pool. It gets the scan code or mouse
+ * position passed in.
+ */
+void noise_ultralight(unsigned long data)
+{
+    DWORD wintime;
+    LARGE_INTEGER perftime;
+
+    random_add_noise(&data, sizeof(DWORD));
+
+    wintime = GetTickCount();
+    random_add_noise(&wintime, sizeof(DWORD));
+
+    if (QueryPerformanceCounter(&perftime))
+       random_add_noise(&perftime, sizeof(perftime));
+}