1 files changed, 66 insertions, 0 deletions
diff --git a/src/util/crypto/sss_crypto.c b/src/util/crypto/sss_crypto.c
new file mode 100644
index 000000000..4c775f3d9
--- /dev/null
+++ b/src/util/crypto/sss_crypto.c
@@ -0,0 +1,66 @@
+/*
+    Authors:
+        Simo Sorce <ssorce@redhat.com>
+
+    Copyright (C) 2016 Red Hat
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "config.h"
+#include "util/util.h"
+#include "util/crypto/sss_crypto.h"
+
+int generate_csprng_buffer(uint8_t *buf, size_t size)
+{
+    ssize_t rsize;
+    ssize_t pos;
+    int ret;
+    int fd;
+
+    fd = open("/dev/urandom", O_RDONLY);
+    if (fd == -1) return errno;
+
+    rsize = 0;
+    pos = 0;
+    while (rsize < size) {
+        rsize = read(fd, buf + pos, size - pos);
+        switch (rsize) {
+        case -1:
+            if (errno == EINTR) continue;
+            ret = EIO;
+            goto done;
+        case 0:
+            ret = EIO;
+            goto done;
+        default:
+            if (rsize + pos < size - pos) {
+                pos += rsize;
+                continue;
+            }
+            ret = EIO;
+            goto done;
+        }
+    }
+    if (rsize != size) {
+        ret = EFAULT;
+        goto done;
+    }
+
+    ret = EOK;
+
+done:
+    close(fd);
+    return ret;
+}