bcrypt

commit d58f7265ced47c79b87b75564935a0d2ee96b8f6
parent 747c68570fa8c96a6212ebc1427f5994f19a130b
Author: Remy Noulin <loader2x@gmail.com>
Date:   Tue, 11 Sep 2018 09:24:40 +0200

use hw random number generator when /dev/urandom in not available (chroot envionment)

bcrypt.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)

Diffstat:
M
bcrypt.c
 | 
9
+++++++--

1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/bcrypt.c b/bcrypt.c
@@ -110,8 +110,12 @@ int bcryptGensaltSync(int workfactor, char salt[BCRYPT_HASHSIZE])
 	char *aux;
 
 	fd = open("/dev/urandom", O_RDONLY);
-	if (fd == -1)
-		return 1;
+	if (fd == -1) {
+		u64 *in = (u64*) input;
+		*(in++) = randomWordFromHW();
+		*(in++) = randomWordFromHW();
+		goto gensalt;
+	}
 
 	if (try_read(fd, input, RANDBYTES) != 0) {
 		if (try_close(fd) != 0)
@@ -123,6 +127,7 @@ int bcryptGensaltSync(int workfactor, char salt[BCRYPT_HASHSIZE])
 		return 3;
 
 	/* Generate salt. */
+	gensalt:
 	workf = (workfactor < 4 || workfactor > 31)?12:workfactor;
 	aux = crypt_gensalt_rn("$2b$", workf, input, RANDBYTES,
 			       salt, BCRYPT_HASHSIZE);