1 files changed, 61 insertions, 0 deletions
diff --git a/src/lib/crypto/builtin/des/key_sched.c b/src/lib/crypto/builtin/des/key_sched.c
new file mode 100644
index 0000000..26449a9
--- /dev/null
+++ b/src/lib/crypto/builtin/des/key_sched.c
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+/*
+ * lib/crypto/des/key_sched.c
+ *
+ * Copyright 1985, 1986, 1987, 1988, 1990 by the Massachusetts Institute
+ * of Technology.
+ * All Rights Reserved.
+ *
+ * Export of this software from the United States of America may
+ *   require a specific license from the United States Government.
+ *   It is the responsibility of any person or organization contemplating
+ *   export to obtain such a license before exporting.
+ * 
+ * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
+ * distribute this software and its documentation for any purpose and
+ * without fee is hereby granted, provided that the above copyright
+ * notice appear in all copies and that both that copyright notice and
+ * this permission notice appear in supporting documentation, and that
+ * the name of M.I.T. not be used in advertising or publicity pertaining
+ * to distribution of the software without specific, written prior
+ * permission.  Furthermore if you modify this software you must label
+ * your software as modified software and not distribute it in such a
+ * fashion that it might be confused with the original M.I.T. software.
+ * M.I.T. makes no representations about the suitability of
+ * this software for any purpose.  It is provided "as is" without express
+ * or implied warranty.
+ * 
+ *
+ * This routine computes the DES key schedule given a key.  The
+ * permutations and shifts have been done at compile time, resulting
+ * in a direct one-step mapping from the input key to the key
+ * schedule.
+ *
+ * Also checks parity and weak keys.
+ *
+ * Watch out for the subscripts -- most effectively start at 1 instead
+ * of at zero.  Maybe some bugs in that area.
+ *
+ * In case the user wants to cache the computed key schedule, it is
+ * passed as an arg.  Also implies that caller has explicit control
+ * over zeroing both the key schedule and the key.
+ *
+ * Originally written 6/85 by Steve Miller, MIT Project Athena.
+ */
+
+#include "k5-int.h"
+#include "des_int.h"
+
+int
+mit_des_key_sched(mit_des_cblock k, mit_des_key_schedule schedule)
+{
+    mit_des_make_key_sched(k,schedule);
+
+    if (!mit_des_check_key_parity(k))	/* bad parity --> return -1 */
+	return(-1);
+
+    if (mit_des_is_weak_key(k))
+	return(-2);
+
+    /* if key was good, return 0 */
+    return 0;
+}