updated build system

[arm-crypto-lib.git] / bcal / keysize_descriptor.c

diff --git a/bcal/keysize_descriptor.c b/bcal/keysize_descriptor.c
new file mode 100644 (file)
index 0000000..8ffb06f
--- /dev/null
+++ b/bcal/keysize_descriptor.c
@@ -0,0 +1,87 @@
+/* keysize_descriptor.c */
+/*
+    This file is part of the ARM-Crypto-Lib.
+    Copyright (C) 2006-2010  Daniel Otte (daniel.otte@rub.de)
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/**
+ * \file    keysize_descriptor.c 
+ * \author  Daniel Otte
+ * \email   daniel.otte@rub.de
+ * \date    2009-01-07
+ * \license GPLv3 or later
+ */
+
+#include <stdint.h>
+#include "keysize_descriptor.h"
+
+uint8_t is_valid_keysize_P(const void* ks_desc, uint16_t keysize){
+       uint8_t type;
+       type = *((uint8_t*)ks_desc);
+       ks_desc = (uint8_t*)ks_desc + 1;
+       if(type==KS_TYPE_TERMINATOR)
+               return 0;
+       if(type==KS_TYPE_LIST){
+               uint8_t items;
+               uint16_t item;
+               items = *((uint8_t*)ks_desc);
+               ks_desc = (uint8_t*)ks_desc + 1;
+               while(items--){
+                       item = *((uint16_t*)ks_desc);
+                       ks_desc = (uint8_t*)ks_desc + 2;
+                       if(item==keysize)
+                               return 1;
+               }
+               ks_desc = (uint8_t*)ks_desc - 2;
+       }
+       if(type==KS_TYPE_RANGE){
+               uint16_t max, min;
+               min = *((uint16_t*)ks_desc);
+               ks_desc = (uint8_t*)ks_desc + 2;
+               max = *((uint16_t*)ks_desc);
+               if(min<=keysize && keysize<=max)
+                       return 1;
+       }
+       if(type==KS_TYPE_ARG_RANGE){
+               uint16_t max, min, dist, offset;
+               min = *((uint16_t*)ks_desc);
+               ks_desc = (uint8_t*)ks_desc + 2;
+               max = *((uint16_t*)ks_desc);
+               ks_desc = (uint8_t*)ks_desc + 2;
+               dist = *((uint16_t*)ks_desc);
+               ks_desc = (uint8_t*)ks_desc + 2;
+               offset = *((uint16_t*)ks_desc);
+               if(min<=keysize && keysize<=max && (keysize%dist==offset))
+                       return 1;
+       }
+       if(type>KS_TYPE_ARG_RANGE){
+               /* bad error, you may insert a big warning message here */
+               return 0;
+       }
+       return is_valid_keysize_P((uint8_t*)ks_desc+1, keysize); /* search the next record */
+}
+
+uint16_t get_keysize(const void* ks_desc){
+       uint8_t type;
+       uint16_t keysize;
+       type = *((uint8_t*)ks_desc);
+       if(type==KS_TYPE_LIST)
+               ks_desc = (uint8_t*)ks_desc + 1;
+       ks_desc = (uint8_t*)ks_desc + 1;
+       keysize = *((uint16_t*)ks_desc);
+       return keysize;
+}
+
+