From e91c20fb8b51c22f8a81ebd8f81343f4bd1d0896 Mon Sep 17 00:00:00 2001
From: Kevin Coffman <kwc@citi.umich.edu>
Date: Fri, 17 Nov 2006 19:48:17 +0000
Subject: update krb5_c_keylength function, create krb5_c_random_to_key
 function

Modify the keylength function to return both keybytes and keylength.
Change the name of the function and source file to reflect this.

Add a function, krb5_c_random_to_key() that takes random input data
of the right length (keybytes) and produce a valid key for a given
enctype.

ticket: new
Target_Version: 1.6
Tags: pullup

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@18836 dc483132-0cff-0310-8789-dd5450dbe970
---
 src/lib/crypto/random_to_key.c | 73 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 src/lib/crypto/random_to_key.c

(limited to 'src/lib/crypto/random_to_key.c')

diff --git a/src/lib/crypto/random_to_key.c b/src/lib/crypto/random_to_key.c
new file mode 100644
index 000000000..20f0abc0d
--- /dev/null
+++ b/src/lib/crypto/random_to_key.c
@@ -0,0 +1,73 @@
+/*
+ * COPYRIGHT (c) 2006
+ * The Regents of the University of Michigan
+ * ALL RIGHTS RESERVED
+ * 
+ * Permission is granted to use, copy, create derivative works
+ * and redistribute this software and such derivative works
+ * for any purpose, so long as the name of The University of
+ * Michigan is not used in any advertising or publicity
+ * pertaining to the use of distribution of this software
+ * without specific, written prior authorization.  If the
+ * above copyright notice or any other identification of the
+ * University of Michigan is included in any copy of any
+ * portion of this software, then the disclaimer below must
+ * also be included.
+ * 
+ * THIS SOFTWARE IS PROVIDED AS IS, WITHOUT REPRESENTATION
+ * FROM THE UNIVERSITY OF MICHIGAN AS TO ITS FITNESS FOR ANY
+ * PURPOSE, AND WITHOUT WARRANTY BY THE UNIVERSITY OF
+ * MICHIGAN OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING
+ * WITHOUT LIMITATION THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE
+ * REGENTS OF THE UNIVERSITY OF MICHIGAN SHALL NOT BE LIABLE
+ * FOR ANY DAMAGES, INCLUDING SPECIAL, INDIRECT, INCIDENTAL, OR
+ * CONSEQUENTIAL DAMAGES, WITH RESPECT TO ANY CLAIM ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OF THE SOFTWARE, EVEN
+ * IF IT HAS BEEN OR IS HEREAFTER ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGES.
+ */
+
+/*
+ * Create a key given random data.  It is assumed that random_key has
+ * already been initialized and random_key->contents have been allocated
+ * with the correct length.
+ */
+#include "k5-int.h"
+#include "etypes.h"
+
+krb5_error_code KRB5_CALLCONV
+krb5_c_random_to_key(krb5_context context, krb5_enctype enctype,
+		     krb5_data *random_data, krb5_keyblock *random_key)
+{
+    int i;
+    krb5_error_code ret;
+    const struct krb5_enc_provider *enc;
+
+    if (random_data == NULL || random_key == NULL)
+	return(EINVAL);
+
+    if (random_key->contents == NULL)
+	return(EINVAL);
+
+    for (i=0; i<krb5_enctypes_length; i++) {
+	if (krb5_enctypes_list[i].etype == enctype)
+	    break;
+    }
+
+    if (i == krb5_enctypes_length)
+	return(KRB5_BAD_ENCTYPE);
+
+    enc = krb5_enctypes_list[i].enc;
+
+    if (random_key->length != enc->keylength)
+	return(KRB5_BAD_KEYSIZE);
+
+    ret = ((*(enc->make_key))(random_data, random_key));
+
+    if (ret) {
+	memset(random_key->contents, 0, random_key->length);
+    }
+
+    return(ret);
+}
-- 
cgit