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Keep RNG seed file descriptor open until the RNG is freed.

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This commit is contained in:
Kareem
2024-05-24 12:22:32 -07:00
parent a103f5af8b
commit ea43bcba72
1 changed files with 21 additions and 14 deletions
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35
wolfcrypt/src/random.c
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@@ -1373,6 +1373,12 @@ int wc_FreeRng(WC_RNG* rng)
ret = WC_HW_E;
#endif
#ifndef USE_WINDOWS_API
if(rng->seed.fd != 0 && rng->seed.fd != -1) {
close(rng->seed.fd);
}
#endif
return ret;
}
@@ -3553,20 +3559,22 @@ int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
#ifndef NO_FILESYSTEM
#ifndef NO_DEV_URANDOM /* way to disable use of /dev/urandom */
os->fd = open("/dev/urandom", O_RDONLY);
#if defined(DEBUG_WOLFSSL)
WOLFSSL_MSG("opened /dev/urandom.");
#endif
if (os->fd == -1)
#endif
{
/* may still have /dev/random */
os->fd = open("/dev/random", O_RDONLY);
#if defined(DEBUG_WOLFSSL)
WOLFSSL_MSG("opened /dev/random.");
#endif
if (os->fd == 0 || os->fd == -1) {
os->fd = open("/dev/urandom", O_RDONLY);
#if defined(DEBUG_WOLFSSL)
WOLFSSL_MSG("opened /dev/urandom.");
#endif
if (os->fd == -1)
return OPEN_RAN_E;
#endif
{
/* may still have /dev/random */
os->fd = open("/dev/random", O_RDONLY);
#if defined(DEBUG_WOLFSSL)
WOLFSSL_MSG("opened /dev/random.");
#endif
if (os->fd == -1)
return OPEN_RAN_E;
}
}
#if defined(DEBUG_WOLFSSL)
WOLFSSL_MSG("rnd read...");
@@ -3590,7 +3598,6 @@ int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
#endif
}
}
close(os->fd);
#else
(void)output;
(void)sz;