ajout tp2

tp/tp2/src/lib/spn.h

@@ -0,0 +1,24 @@
+#ifndef _SPN_H
+#define _SPN_H
+
+void calc_inv_perm(unsigned char perm[8],unsigned char inv_perm[8]);
+void calc_inv_subst(unsigned char subst[16],unsigned char inv_subst[16]);
+
+unsigned char do_perm(unsigned char w,unsigned char perm[8]);
+unsigned char do_subst(unsigned char w,unsigned char subst[16]);
+ 
+unsigned char encrypt(
+		unsigned char w, 
+		unsigned int key,
+		unsigned char perm[8],
+		unsigned char subst[16]
+		);
+ 
+unsigned char decrypt(
+		unsigned char w, 
+		unsigned int key,
+		unsigned char perm[8],
+		unsigned char subst[16]
+		);
+ 
+#endif