Import OpenSSH 4.2p1.

1 files changed, 46 insertions, 0 deletions

diff --git a/mpaux.c b/mpaux.c
new file mode 100644
index 000000000..0c486275f
--- /dev/null
+++ b/mpaux.c
@@ -0,0 +1,46 @@
+/*
+ * Author: Tatu Ylonen <ylo@cs.hut.fi>
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ *                    All rights reserved
+ * This file contains various auxiliary functions related to multiple
+ * precision integers.
+ *
+ * As far as I am concerned, the code I have written for this software
+ * can be used freely for any purpose.  Any derived versions of this
+ * software must be clearly marked as such, and if the derived work is
+ * incompatible with the protocol description in the RFC file, it must be
+ * called by a name other than "ssh" or "Secure Shell".
+ */
+
+#include "includes.h"
+RCSID("$OpenBSD: mpaux.c,v 1.16 2001/02/08 19:30:52 itojun Exp $");
+
+#include <openssl/bn.h>
+#include "getput.h"
+#include "xmalloc.h"
+
+#include <openssl/md5.h>
+
+#include "mpaux.h"
+
+void
+compute_session_id(u_char session_id[16],
+    u_char cookie[8],
+    BIGNUM* host_key_n,
+    BIGNUM* session_key_n)
+{
+        u_int host_key_bytes = BN_num_bytes(host_key_n);
+        u_int session_key_bytes = BN_num_bytes(session_key_n);
+        u_int bytes = host_key_bytes + session_key_bytes;
+        u_char *buf = xmalloc(bytes);
+        MD5_CTX md;
+
+        BN_bn2bin(host_key_n, buf);
+        BN_bn2bin(session_key_n, buf + host_key_bytes);
+        MD5_Init(&md);
+        MD5_Update(&md, buf, bytes);
+        MD5_Update(&md, cookie, 8);
+        MD5_Final(session_id, &md);
+        memset(buf, 0, bytes);
+        xfree(buf);
+}