X-Git-Url: https://git.cryptolib.org/?a=blobdiff_plain;ds=inline;f=keysize_descriptor.c;fp=keysize_descriptor.c;h=8ffb06f7eb55928d763b92725605d83b8b504036;hb=3f2f2071c47e2e424af71cc85697f3eb26c24277;hp=0000000000000000000000000000000000000000;hpb=33a28395461ecd0c1c7820f59e180f8f2ca9216f;p=arm-crypto-lib.git

diff --git a/keysize_descriptor.c b/keysize_descriptor.c
new file mode 100644
index 0000000..8ffb06f
--- /dev/null
+++ b/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;
+}
+
+