1 files changed, 75 insertions, 0 deletions
diff --git a/bignum.c b/bignum.c
new file mode 100644
index 0000000..60b5220
--- /dev/null
+++ b/bignum.c
@@ -0,0 +1,75 @@
+/*
+ * Dropbear - a SSH2 server
+ * 
+ * Copyright (c) 2002,2003 Matt Johnston
+ * All rights reserved.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE. */
+
+/* Contains helper functions for mp_int handling */
+
+#include "includes.h"
+#include "dbutil.h"
+
+/* wrapper for mp_init, failing fatally on errors (memory allocation) */
+void m_mp_init(mp_int *mp) {
+
+	if (mp_init(mp) != MP_OKAY) {
+		dropbear_exit("mem alloc error");
+	}
+}
+
+/* simplified duplication of bn_mp_multi's mp_init_multi, but die fatally
+ * on error */
+void m_mp_init_multi(mp_int *mp, ...) 
+{
+    mp_int* cur_arg = mp;
+    va_list args;
+
+    va_start(args, mp);        /* init args to next argument from caller */
+    while (cur_arg != NULL) {
+        if (mp_init(cur_arg) != MP_OKAY) {
+			dropbear_exit("mem alloc error");
+        }
+        cur_arg = va_arg(args, mp_int*);
+    }
+    va_end(args);
+}
+
+void bytes_to_mp(mp_int *mp, const unsigned char* bytes, unsigned int len) {
+
+	if (mp_read_unsigned_bin(mp, (unsigned char*)bytes, len) != MP_OKAY) {
+		dropbear_exit("mem alloc error");
+	}
+}
+
+/* hash the ssh representation of the mp_int mp */
+void sha1_process_mp(hash_state *hs, mp_int *mp) {
+
+	int i;
+	buffer * buf;
+
+	buf = buf_new(512 + 20); /* max buffer is a 4096 bit key, 
+								plus header + some leeway*/
+	buf_putmpint(buf, mp);
+	i = buf->pos;
+	buf_setpos(buf, 0);
+	sha1_process(hs, buf_getptr(buf, i), i);
+	buf_free(buf);
+}