1 files changed, 77 insertions, 0 deletions
diff --git a/crypto/openssh/openbsd-compat/bsd-arc4random.c b/crypto/openssh/openbsd-compat/bsd-arc4random.c
new file mode 100644
index 0000000..ab4e143
--- /dev/null
+++ b/crypto/openssh/openbsd-compat/bsd-arc4random.c
@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 1999-2000 Damien Miller.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "includes.h"
+#include "log.h"
+
+RCSID("$Id: bsd-arc4random.c,v 1.5 2002/05/08 22:57:18 tim Exp $");
+
+#ifndef HAVE_ARC4RANDOM
+
+#include <openssl/rand.h>
+#include <openssl/rc4.h>
+#include <openssl/err.h>
+
+/* Size of key to use */
+#define SEED_SIZE 20
+
+/* Number of bytes to reseed after */
+#define REKEY_BYTES	(1 << 24)
+
+static int rc4_ready = 0;
+static RC4_KEY rc4;
+
+unsigned int arc4random(void)
+{
+	unsigned int r = 0;
+	static int first_time = 1;
+
+	if (rc4_ready <= 0) {
+		if (first_time)
+			seed_rng();
+		first_time = 0;
+		arc4random_stir();
+	}
+
+	RC4(&rc4, sizeof(r), (unsigned char *)&r, (unsigned char *)&r);
+
+	rc4_ready -= sizeof(r);
+	
+	return(r);
+}
+
+void arc4random_stir(void)
+{
+	unsigned char rand_buf[SEED_SIZE];
+
+	memset(&rc4, 0, sizeof(rc4));
+	if (!RAND_bytes(rand_buf, sizeof(rand_buf)))
+		fatal("Couldn't obtain random bytes (error %ld)",
+		    ERR_get_error());
+	RC4_set_key(&rc4, sizeof(rand_buf), rand_buf);
+	memset(rand_buf, 0, sizeof(rand_buf));
+
+	rc4_ready = REKEY_BYTES;
+}
+#endif /* !HAVE_ARC4RANDOM */