last commit

src/main.c

@@ -1,3 +1,11 @@
+/*
+ * ----------------------------------------------------------------------------
+ * "THE BEER-WARE LICENSE" (Revision 42):
+ * <paum1202@usherbrooke.ca> wrote this file.  As long as you retain this notice you
+ * can do whatever you want with this stuff. If we meet some day, and you think
+ * this stuff is worth it, you can buy me a beer in return. -violette paulin 
+ * ----------------------------------------------------------------------------
+ */
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -23,10 +31,11 @@ static char			*gen2();
 static char			*e3(char *, char *);
 static char			*d3(char *, char *);
 static char			*gen3();
+static void			 eve_shenanigans(char *);
 
-static inline char	 genChar();
-static inline char	 genByte();
-static void			 printHex(char *);
+static inline char	 gen_char();
+static inline char	 gen_byte();
+static void			 print_hex(char *);
 
 int
 main(int argc, char *argv[])
@@ -72,13 +81,15 @@ main(int argc, char *argv[])
 	char msg_otp[] = 
 			"ceciestlemessageclairadechiffreilcomporte64charcestplutotlongxd";
 	printf("key: %s\n", key_otp);
+	printf("key as hex: ");
+	print_hex(key_otp);
 	printf("msg before: %s\n", msg_otp);
 	printf("msg as hex: ");
-	printHex(msg_otp);
+	print_hex(msg_otp);
 	char *cypher_otp = e2(msg_otp, key_otp);
 	printf("cypher: %s\n", cypher_otp);
 	printf("cypher as hex: ");
-	printHex(cypher_otp);
+	print_hex(cypher_otp);
 	char *res_otp = d2(cypher_otp, key_otp);
 	printf("msg after: %s\n", res_otp);
 
@@ -94,10 +105,38 @@ main(int argc, char *argv[])
 	char *key_vignere = gen3();
 	char msg_vignere[] = "ceciestlemessageclairadechiffre";
 
+	printf("key: %s\n", key_vignere);
+	printf("key as hex: ");
+	print_hex(key_vignere);
+	printf("msg before: %s\n", msg_vignere);
+	printf("msg as hex: ");
+	print_hex(msg_vignere);
+	char *cypher_vignere = e3(msg_vignere, key_vignere);
+	printf("cypher: %s\n", cypher_vignere);
+	printf("cypher as hex: ");
+	print_hex(cypher_vignere);
+	char *res_vignere = d3(cypher_vignere, key_vignere);
+	printf("msg after: %s\n", res_vignere);
+
+	free(res_vignere);
+	free(cypher_vignere);
+	free(key_vignere);
+#endif
+
+#ifdef PART3C
+	/* PART 3 */
+	printf("-------PART3C-------\n");
+	char *key_vignere = gen3();
+	char msg_vignere[] = "ceciestlemessageclairadechiffre";
+
 	printf("key: %s\n", key_vignere);
 	printf("msg before: %s\n", msg_vignere);
 	char *cypher_vignere = e3(msg_vignere, key_vignere);
 	printf("cypher: %s\n", cypher_vignere);
+
+	eve_shenanigans(cypher_vignere);
+	printf("cypher tempered by Eve: %s\n", cypher_vignere);
+
 	char *res_vignere = d3(cypher_vignere, key_vignere);
 	printf("msg after: %s\n", res_vignere);
 
@@ -188,14 +227,14 @@ gen2()
 {
 	char *res = (char *)calloc(sizeof(char) * SIZE_OTP, 1);
 	for (unsigned char k = 0 ; k <= SIZE_OTP - 8 ; k = k + 8) {
-		res[k] = genByte();
-		res[k + 1] = genByte();
-		res[k + 2] = genByte();
-		res[k + 3] = genByte();
-		res[k + 4] = genByte();
-		res[k + 5] = genByte();
-		res[k + 6] = genByte();
-		res[k + 7] = genByte();
+		res[k] = gen_byte();
+		res[k + 1] = gen_byte();
+		res[k + 2] = gen_byte();
+		res[k + 3] = gen_byte();
+		res[k + 4] = gen_byte();
+		res[k + 5] = gen_byte();
+		res[k + 6] = gen_byte();
+		res[k + 7] = gen_byte();
 	}
 
 	res[SIZE_OTP - 1] = '\0';
@@ -204,7 +243,7 @@ gen2()
 }
 
 static inline char
-genByte()
+gen_byte()
 {
 	return rand() % 256;
 }
@@ -250,7 +289,7 @@ d3(char *cypher, char *key)
 }
 
 static inline char
-genChar()
+gen_char()
 {
 	return rand() % SIZE_ALPH;
 }
@@ -260,14 +299,14 @@ gen3()
 {
 	char *res = (char *)calloc(sizeof(char) * SIZE_MSG, 1);
 	for (unsigned char k = 0 ; k <= SIZE_MSG - 8 ; k = k + 8) {
-		res[k] = genChar() + 'a';
-		res[k + 1] = genChar() + 'a';
-		res[k + 2] = genChar() + 'a';
-		res[k + 3] = genChar() + 'a';
-		res[k + 4] = genChar() + 'a';
-		res[k + 5] = genChar() + 'a';
-		res[k + 6] = genChar() + 'a';
-		res[k + 7] = genChar() + 'a';
+		res[k] = gen_char() + 'a';
+		res[k + 1] = gen_char() + 'a';
+		res[k + 2] = gen_char() + 'a';
+		res[k + 3] = gen_char() + 'a';
+		res[k + 4] = gen_char() + 'a';
+		res[k + 5] = gen_char() + 'a';
+		res[k + 6] = gen_char() + 'a';
+		res[k + 7] = gen_char() + 'a';
 	}
 
 	res[SIZE_MSG - 1] = '\0';
@@ -275,11 +314,36 @@ gen3()
 }
 
 static void
-printHex(char *str)
+eve_shenanigans(char *cypher)
+{
+	unsigned short k		= 0;
+	unsigned short c_count	= 0;
+
+	while (cypher[k] != '\0' && c_count < 2) {
+		if (cypher[k] == 'c')
+			++c_count;
+		++k;
+	}
+
+	while (cypher[k] != '\0') {
+		if (cypher[k] == 'c')
+			cypher[k] += 9;
+		++k;
+	}
+
+	while (cypher[k] != '\0') {
+		if (cypher[k] == 'c')
+			cypher[k] += 18;
+		++k;
+	}
+}
+
+static void
+print_hex(char *str)
 {
 	short k = 0;
 	while (str[k] != '\0') {
-		printf("%02X ", str[k]);
+		printf("%02X ", str[k] & 0xff);
 		++k;
 	}
 	printf("\n");