diff options
Diffstat (limited to 'nacl/randombytes/devurandom.c')
-rw-r--r-- | nacl/randombytes/devurandom.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/nacl/randombytes/devurandom.c b/nacl/randombytes/devurandom.c new file mode 100644 index 00000000..f3b8d418 --- /dev/null +++ b/nacl/randombytes/devurandom.c | |||
@@ -0,0 +1,34 @@ | |||
1 | #include <sys/types.h> | ||
2 | #include <sys/stat.h> | ||
3 | #include <fcntl.h> | ||
4 | #include <unistd.h> | ||
5 | |||
6 | /* it's really stupid that there isn't a syscall for this */ | ||
7 | |||
8 | static int fd = -1; | ||
9 | |||
10 | void randombytes(unsigned char *x,unsigned long long xlen) | ||
11 | { | ||
12 | int i; | ||
13 | |||
14 | if (fd == -1) { | ||
15 | for (;;) { | ||
16 | fd = open("/dev/urandom",O_RDONLY); | ||
17 | if (fd != -1) break; | ||
18 | sleep(1); | ||
19 | } | ||
20 | } | ||
21 | |||
22 | while (xlen > 0) { | ||
23 | if (xlen < 1048576) i = xlen; else i = 1048576; | ||
24 | |||
25 | i = read(fd,x,i); | ||
26 | if (i < 1) { | ||
27 | sleep(1); | ||
28 | continue; | ||
29 | } | ||
30 | |||
31 | x += i; | ||
32 | xlen -= i; | ||
33 | } | ||
34 | } | ||