| 1 | /* |
| 2 | * uxgen.c: Unix implementation of get_heavy_noise() from cmdgen.c. |
| 3 | */ |
| 4 | |
| 5 | #include <stdio.h> |
| 6 | #include <fcntl.h> |
| 7 | #include <unistd.h> |
| 8 | |
| 9 | #include "putty.h" |
| 10 | |
| 11 | char *get_random_data(int len) |
| 12 | { |
| 13 | char *buf = snewn(len, char); |
| 14 | int fd; |
| 15 | int ngot, ret; |
| 16 | |
| 17 | fd = open("/dev/random", O_RDONLY); |
| 18 | if (fd < 0) { |
| 19 | sfree(buf); |
| 20 | perror("puttygen: unable to open /dev/random"); |
| 21 | return NULL; |
| 22 | } |
| 23 | |
| 24 | ngot = 0; |
| 25 | while (ngot < len) { |
| 26 | ret = read(fd, buf+ngot, len-ngot); |
| 27 | if (ret < 0) { |
| 28 | close(fd); |
| 29 | perror("puttygen: unable to read /dev/random"); |
| 30 | return NULL; |
| 31 | } |
| 32 | ngot += ret; |
| 33 | } |
| 34 | |
| 35 | close(fd); |
| 36 | |
| 37 | return buf; |
| 38 | } |