added key rosicchiamento code (test)

1 files changed, 43 insertions, 0 deletions

diff --git a/rosicchio.c b/rosicchio.c
new file mode 100644
index 0000000..53f714e
--- /dev/null
+++ b/rosicchio.c
@@ -0,0 +1,43 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+int main(int argc, char* argv[]) {
+
+	FILE* mess = fopen(argv[1], "r");
+	FILE* pad = fopen(argv[2], "r+");
+	FILE* critt = fopen(argv[3],"w");
+	fseek(mess, 0L, SEEK_END);
+	long mess_size = ftell(mess);
+	rewind(mess);
+	fseek(pad, 0L, SEEK_END);
+	long pad_size = ftell(pad);
+	fseek(pad, (pad_size - mess_size), SEEK_SET);
+	int i = 1;
+	char a, b;
+
+	while(i != EOF) {
+		i = fscanf(mess, "%c", &a);
+		fscanf(pad, "%c", &b);
+		if(i != EOF) {
+			fprintf(critt, "%c", a^b);
+		}
+	}
+
+	/* The truncate function "rosicchia" la parte di chiave utilizzata */
+
+	truncate(argv[2], (pad_size - mess_size));
+	fseek(pad, 0L, SEEK_END);
+	long new_pad_size = ftell(pad);
+
+	fclose(mess);
+	fclose(pad);
+	fclose(critt);
+
+	printf("Message length is %li bytes \n", mess_size);
+	printf("Pad length was %li bytes \n", pad_size);
+	printf("Pad length is now %li bytes \n", new_pad_size);
+	printf("Pad length should now be %li bytes \n", (pad_size - mess_size));
+
+	exit(EXIT_SUCCESS);
+}