1 files changed, 54 insertions, 0 deletions
diff --git a/src/lib/crypto/krb/default_state.c b/src/lib/crypto/krb/default_state.c
new file mode 100644
index 000000000000..c7bfe323f799
--- /dev/null
+++ b/src/lib/crypto/krb/default_state.c
@@ -0,0 +1,54 @@
+/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
+/*
+ * Copyright (C) 2001, 2014 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.
+ *
+ * Section 6 (Encryption) of the Kerberos revisions document defines
+ * cipher states to be used to chain encryptions and decryptions
+ * together.  Examples of cipher states include initialization vectors
+ * for CBC encription.  Most Kerberos encryption systems can share
+ * code for initializing and freeing cipher states.  This file
+ * contains that default code.
+ */
+
+#include "crypto_int.h"
+
+krb5_error_code
+krb5int_des_init_state(const krb5_keyblock *key, krb5_keyusage usage,
+                       krb5_data *state_out)
+{
+    if (alloc_data(state_out, 8))
+        return ENOMEM;
+
+    /* des-cbc-crc uses the key as the initial ivec. */
+    if (key->enctype == ENCTYPE_DES_CBC_CRC)
+        memcpy(state_out->data, key->contents, state_out->length);
+
+    return 0;
+}
+
+void
+krb5int_default_free_state(krb5_data *state)
+{
+    free(state->data);
+    *state = empty_data();
+}