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435b29da88
E.g. you might pass '--random-device=/dev/urandom'. Mostly because I got sick of waiting for /dev/random to finish blocking while I was trying to generate throwaway keys for testing bug fixes in cmdgen itself. But it might also be useful on systems that call their random device by a different name that we haven't encountered. (Since cmdgen also reads the saved PuTTY random seed file, setting this option to /dev/zero will not render key generation deterministic. It's tempting to provide _some_ way to do that, for testing purposes and clearly marked as dangerous of course, but I think it would take more faff than this.)
47 lines
826 B
C
47 lines
826 B
C
/*
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* uxgen.c: Unix implementation of get_heavy_noise() from cmdgen.c.
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include "putty.h"
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char *get_random_data(int len, const char *device)
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{
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char *buf = snewn(len, char);
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int fd;
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int ngot, ret;
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if (!device)
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device = "/dev/random";
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fd = open(device, O_RDONLY);
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if (fd < 0) {
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sfree(buf);
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fprintf(stderr, "puttygen: %s: open: %s\n",
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device, strerror(errno));
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return NULL;
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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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close(fd);
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sfree(buf);
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fprintf(stderr, "puttygen: %s: read: %s\n",
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device, strerror(errno));
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return NULL;
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}
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ngot += ret;
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}
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close(fd);
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return buf;
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}
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