X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;f=libraries%2Fliblutil%2Fentropy.c;h=74d3f3210ab8b875d5400428b230a376b47a061e;hb=c0f8e30d2290b22718f3cfd6800679dfb4c253a9;hp=4a16c5dd1bd5c4340f54b5237aad8add2e52d5fd;hpb=e5eb270e6c04102f42545d34efdce318b439f5ab;p=openldap

diff --git a/libraries/liblutil/entropy.c b/libraries/liblutil/entropy.c
index 4a16c5dd1b..74d3f3210a 100644
--- a/libraries/liblutil/entropy.c
+++ b/libraries/liblutil/entropy.c
@@ -1,6 +1,6 @@
 /* $OpenLDAP$ */
 /*
- * Copyright 1998-2000 The OpenLDAP Foundation, All Rights Reserved.
+ * Copyright 1998-2002 The OpenLDAP Foundation, All Rights Reserved.
  * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
  */
 
@@ -36,21 +36,27 @@ int lutil_entropy( unsigned char *buf, ber_len_t nbytes )
 	if( nbytes == 0 ) return 0;
 
 #ifdef URANDOM_DEVICE
+#define URANDOM_NREADS 4
 	/* Linux and *BSD offer a urandom device */
 	{
-		int rc, fd;
+		int rc, fd, n=0;
 
 		fd = open( URANDOM_DEVICE, O_RDONLY );
 
 		if( fd < 0 ) return -1;
 
-		rc = read( fd, buf, nbytes );
-		close(fd);
+		do {
+			rc = read( fd, buf, nbytes );
+			if( rc <= 0 ) break;
 
-		/* should return nbytes */
-		if( rc < nbytes ) return -1;
+			buf+=rc;
+			nbytes-=rc;
 
-		return 0;
+			if( ++n >= URANDOM_NREADS ) break;
+		} while( nbytes > 0 );
+
+		close(fd);
+		return nbytes > 0 ? -1 : 0;
 	}
 #elif PROV_RSA_FULL
 	{