From 0ca5e4495591f77629166b83ee7435f5a10093d3 Mon Sep 17 00:00:00 2001
From: Love Hornquist Astrand <lha@h5l.org>
Date: Sun, 15 May 2011 13:25:49 -0700
Subject: [PATCH] shared key for _krb5_fast_armor_key

---
 lib/krb5/fast.c | 77 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 lib/krb5/fast.c

diff --git a/lib/krb5/fast.c b/lib/krb5/fast.c
new file mode 100644
index 000000000..67e812df0
--- /dev/null
+++ b/lib/krb5/fast.c
@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2011 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * 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.
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE OR CONTRIBUTORS 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 "krb5_locl.h"
+
+
+krb5_error_code
+_krb5_fast_armor_key(krb5_context context,
+		     krb5_keyblock *sessionkey,
+		     krb5_keyblock *subkey,
+		     krb5_keyblock *armorkey,
+		     krb5_crypto *armor_crypto)
+{
+    krb5_crypto crypto_subkey, crypto_session;
+    krb5_data pepper1, pepper2;
+    krb5_error_code ret;
+
+    ret = krb5_crypto_init(context, subkey, 0, &crypto_subkey);
+    if (ret)
+	return ret;
+
+    ret = krb5_crypto_init(context, sessionkey, 0, &crypto_session);
+    if (ret) {
+	krb5_crypto_destroy(context, crypto_subkey);
+	return ret;
+    }
+
+    pepper1.data = "subkeyarmor";
+    pepper1.length = strlen(pepper1.data);
+    pepper2.data = "ticketarmor";
+    pepper2.length = strlen(pepper2.data);
+
+    ret = krb5_crypto_fx_cf2(context, crypto_subkey, crypto_session,
+			     &pepper1, &pepper2,
+			     subkey->keytype,
+			     armorkey);
+    krb5_crypto_destroy(context, crypto_subkey);
+    krb5_crypto_destroy(context, crypto_session);
+    if (ret)
+	return ret;
+
+    ret = krb5_crypto_init(context, armorkey, 0, armor_crypto);
+    if (ret)
+	krb5_free_keyblock_contents(context, armorkey);
+
+    return ret;
+}