tp3

tp3/test_df.c

@@ -0,0 +1,59 @@
+#include "df.h"
+#include "./lib_tea/xtea.h"
+
+#include <stdio.h>
+#include <assert.h>
+#include <stdlib.h>
+#include <time.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdint.h>
+
+int main(int argc, char *argv[])
+{
+	uint64 p = 4611686018427402023,
+		   a,b,
+		   A,B,AB,BA,
+		   g;
+
+	uint32_t k[4]; // for tea
+				   //
+
+
+
+	g=generateur(p);
+	srand(getpid()^time(NULL));
+
+	for (int i = 0;i < 2; i++){
+
+		a = 2 + rand()%(p-3);
+		A=expm(g,a,p);
+
+		b = 2 + rand()%(p-3);
+		B = expm(g,b,p);
+
+
+		AB = expm(A,b,p);
+
+		BA = expm(B,a,p);
+		//printf("%lx %lx %lx %lx %lx %lx\n",a,b,A,B,AB,BA);
+		assert(AB == BA);
+
+		memcpy((void*)(k+2*i),(void*)&AB,sizeof(uint32_t)*2);
+	}
+
+	printf("key for tea = (%x,%x,%x,%x)\n",k[0],k[1],k[2],k[3]);
+
+
+
+	while(1){
+		uint32_t  v[2]={0};
+		ssize_t nb_read = read(0,v,sizeof(v));
+		if (nb_read <= 0)
+			break;
+		encrypt_xtea(v,k);
+		decrypt_xtea(v,k);
+		write(1,v,sizeof(v));
+	}
+	return 0;
+}