added the .check function in FIPS140-2 code

1 files changed, 10 insertions, 0 deletions

diff --git a/lib/nettle/rnd-fips.c b/lib/nettle/rnd-fips.c
index 4f67eafa52..254cb3b83d 100644
--- a/lib/nettle/rnd-fips.c
+++ b/lib/nettle/rnd-fips.c
@@ -227,6 +227,15 @@ static void _rngfips_deinit(void *_ctx)
 	free(ctx);
 }
 
+/* This is called when gnutls_global_init() is called for second time.
+ * It must check whether any resources are still available.
+ * The particular problem it solves is to verify that the urandom fd is still
+ * open (for applications that for some reason closed all fds */
+static int _rndfips_check(void **ctx)
+{
+	return _rnd_system_entropy_check();
+}
+
 static void _rngfips_refresh(void *_ctx)
 {
 	/* this is predictable RNG. Don't refresh */
@@ -252,6 +261,7 @@ static int selftest_kat(void)
 
 gnutls_crypto_rnd_st _gnutls_fips_rnd_ops = {
 	.init = _rngfips_init,
+	.check = _rndfips_check,
 	.deinit = _rngfips_deinit,
 	.rnd = _rngfips_rnd,
 	.rnd_refresh = _rngfips_refresh,