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plugins: add support for hwrng and check if seed file is empty

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Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
This commit is contained in:
Joachim Wiberg
2024-03-13 12:06:32 +01:00
parent 90a4df8d12
commit bf4a584e2e
1 changed files with 28 additions and 9 deletions
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plugins/urandom.c
+28 -9
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@@ -47,6 +47,7 @@ static void setup(void *arg)
#ifdef RANDOMSEED
struct rand_pool_info *rpi;
ssize_t len = 0;
struct stat st;
int rc = -1;
int fd, err;
@@ -55,7 +56,7 @@ static void setup(void *arg)
return;
}
if (!fexist(RANDOMSEED)) {
if (stat(RANDOMSEED, &st) || st.st_size < 512) {
int ret = 1;
mode_t prev;
FILE *fp;
@@ -64,16 +65,34 @@ static void setup(void *arg)
prev = umask(077);
fp = fopen(RANDOMSEED, "w");
if (fp) {
int iter = 128;
struct timeval tv;
const char *hwrng = "/dev/hwrng";
FILE *hw;
gettimeofday(&tv, NULL);
srandom(tv.tv_sec % 3600);
while (iter--) {
uint32_t i, prng = random();
hw = fopen(hwrng, "r");
if (hw) {
char buf[512];
size_t len;
for (i = 0; i < sizeof(prng); i++)
fputc((prng >> (i * CHAR_BIT)) & UCHAR_MAX, fp);
len = fread(buf, sizeof(buf[0]), sizeof(buf), hw);
if (len == 0) {
fclose(hw);
goto no_hwrng;
}
len = fwrite(buf, sizeof(buf[0]), len, fp);
fclose(hw);
} else {
struct timeval tv;
int iter = 128;
no_hwrng:
gettimeofday(&tv, NULL);
srandom(tv.tv_sec % 3600);
while (iter--) {
uint32_t i, prng = random();
for (i = 0; i < sizeof(prng); i++)
fputc((prng >> (i * CHAR_BIT)) & UCHAR_MAX, fp);
}
}
ret = fclose(fp);
}