add checking function

src/libecrypt.c

@@ -5,7 +5,9 @@
 #include <stdlib.h>
 #include <time.h>
 
-void ecrypt(int N) {
+void
+ecrypt_gen(int N)
+{
 	int c = 0;
 	int randomizer = 0;
 
@@ -43,3 +45,51 @@ void ecrypt(int N) {
 		}
 	}
 }
+
+int
+ecrypt_check(char *firstkey, char *secondkey)
+{
+	FILE *key1;
+	FILE *key2;
+
+	int cnt1 = 0;
+	int cnt2 = 0;
+	int flg = 0;
+
+	key1 = fopen(firstkey, "r");
+	if (key1 == NULL) {
+		printf("error opening %s\n", firstkey);
+		return 2;
+	}
+
+	fseek(key1, 0, SEEK_END);
+	cnt1 = ftell(key1);
+
+	key2 = fopen(secondkey, "r");
+	if (key2 == NULL) {
+		printf("error opening %s\n", secondkey);
+		return 2;
+	}
+
+	fseek(key2, 0, SEEK_END);
+	cnt1 = ftell(key2);
+
+	if (cnt1 != cnt2) {
+		return 1;
+	} else {
+		while (! feof(key1)) {
+			if (fgetc(key1) != fgetc(key2)) {
+				flg = 1;
+				break;
+			}
+		}
+		if (flg) {
+			return 1;
+		} else {
+			return 0;
+		}
+	}
+
+	fclose(key1);
+	fclose(key2);
+}