mirror of
https://git.tartarus.org/simon/putty.git
synced 2025-01-10 09:58:01 +00:00
317180ed49
doesn't yet use the SSH agent, no way to specify arbitrary config options, no manpage yet, couple of other fiddly things need doing, but it makes SSH connections and doesn't fall over horribly so I say it's a good start. Now to run it under valgrind... [originally from svn r2165]
96 lines
2.0 KiB
C
96 lines
2.0 KiB
C
/*
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* Noise generation for PuTTY's cryptographic random number
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* generator.
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*/
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#include <stdio.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/time.h>
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#include "putty.h"
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#include "ssh.h"
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#include "storage.h"
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/*
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* FIXME. This module currently depends critically on /dev/urandom,
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* because it has no fallback mechanism for doing anything else.
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*/
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static void read_dev_urandom(char *buf, int len)
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{
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int fd;
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int ngot, ret;
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fd = open("/dev/urandom", O_RDONLY);
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if (fd < 0) {
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perror("/dev/urandom: open");
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exit(1);
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}
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ngot = 0;
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while (ngot < len) {
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ret = read(fd, buf+ngot, len-ngot);
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if (ret < 0) {
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perror("/dev/urandom: read");
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exit(1);
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}
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ngot += ret;
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}
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}
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/*
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* This function is called once, at PuTTY startup. Currently it
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* will read 32 bytes out of /dev/urandom and seed the internal
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* generator with them.
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*/
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void noise_get_heavy(void (*func) (void *, int))
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{
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char buf[32];
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read_dev_urandom(buf, sizeof(buf));
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func(buf, sizeof(buf));
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}
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void random_save_seed(void)
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{
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/* Currently we do nothing here. FIXME? */
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}
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/*
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* This function is called every time the urandom pool needs
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* stirring, and will acquire the system time.
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*/
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void noise_get_light(void (*func) (void *, int))
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{
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struct timeval tv;
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gettimeofday(&tv, NULL);
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func(&tv, sizeof(tv));
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}
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/*
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* This function is called on a timer, and it will just pull some
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* stuff out of /dev/urandom. FIXME: really I suspect we ought not
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* to deplete /dev/urandom like this. Better to grab something more
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* harmless.
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*/
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void noise_regular(void)
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{
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char buf[4];
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read_dev_urandom(buf, sizeof(buf));
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random_add_noise(buf, sizeof(buf));
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}
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/*
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* This function is called on every keypress or mouse move, and
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* will add the current time to the noise pool. It gets the scan
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* code or mouse position passed in, and adds that too.
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*/
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void noise_ultralight(unsigned long data)
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{
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struct timeval tv;
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gettimeofday(&tv, NULL);
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random_add_noise(&tv, sizeof(tv));
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random_add_noise(&data, sizeof(data));
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}
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