summaryrefslogtreecommitdiff
path: root/ext/libressl/crypto/compat/getentropy_netbsd.c
diff options
context:
space:
mode:
authorUros Majstorovic <majstor@majstor.org>2022-02-02 06:25:38 +0100
committerUros Majstorovic <majstor@majstor.org>2022-02-02 06:25:38 +0100
commit378d4ce7552df580e3ddd89c2faa9f8c5086d646 (patch)
tree36fe323de93de5d6b8fb27827fc57984c5b15f6d /ext/libressl/crypto/compat/getentropy_netbsd.c
parent9d775a05562d6166a5142d9820ffa7c26de55d6c (diff)
renamed crypto -> ext
Diffstat (limited to 'ext/libressl/crypto/compat/getentropy_netbsd.c')
-rw-r--r--ext/libressl/crypto/compat/getentropy_netbsd.c62
1 files changed, 62 insertions, 0 deletions
diff --git a/ext/libressl/crypto/compat/getentropy_netbsd.c b/ext/libressl/crypto/compat/getentropy_netbsd.c
new file mode 100644
index 0000000..5dc8959
--- /dev/null
+++ b/ext/libressl/crypto/compat/getentropy_netbsd.c
@@ -0,0 +1,62 @@
+/* $OpenBSD: getentropy_netbsd.c,v 1.4 2020/10/12 22:08:33 deraadt Exp $ */
+
+/*
+ * Copyright (c) 2014 Pawel Jakub Dawidek <pjd@FreeBSD.org>
+ * Copyright (c) 2014 Brent Cook <bcook@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * Emulation of getentropy(2) as documented at:
+ * http://man.openbsd.org/getentropy.2
+ */
+
+#include <sys/types.h>
+#include <sys/sysctl.h>
+
+#include <errno.h>
+#include <stddef.h>
+
+/*
+ * Derived from lib/libc/gen/arc4random.c from FreeBSD.
+ */
+static size_t
+getentropy_sysctl(u_char *buf, size_t size)
+{
+ const int mib[2] = { CTL_KERN, KERN_ARND };
+ size_t len, done;
+
+ done = 0;
+
+ do {
+ len = size;
+ if (sysctl(mib, 2, buf, &len, NULL, 0) == -1)
+ return (done);
+ done += len;
+ buf += len;
+ size -= len;
+ } while (size > 0);
+
+ return (done);
+}
+
+int
+getentropy(void *buf, size_t len)
+{
+ if (len <= 256 &&
+ getentropy_sysctl(buf, len) == len) {
+ return (0);
+ }
+
+ errno = EIO;
+ return (-1);
+}