From 7d5ea469a8291062dbc6a8bbf9b3ca8942d41a21 Mon Sep 17 00:00:00 2001
From: Seppia <nonso@insicuri.net>
Date: Sun, 12 Jun 2016 17:08:18 +0200
Subject: added decrypt option just for the feeling

---
 onetimebluh.c | 35 ++++++++++++++++++++++++++---------
 1 file changed, 26 insertions(+), 9 deletions(-)

diff --git a/onetimebluh.c b/onetimebluh.c
index e6366f0..3b163c3 100644
--- a/onetimebluh.c
+++ b/onetimebluh.c
@@ -6,7 +6,7 @@
 #include <errno.h>
 #include <error.h>
 
-void xor(char* mess, char* keyf, char* outp);
+void xor(int ed, char* mess, char* keyf, char* outp);
 void keyrand(int nb, char* outp);
 void help(char* av[]);
 
@@ -22,6 +22,7 @@ int main(int argc, char* argv[]) {
 	while (opt) {
 		int option_index = 0;
 		static struct option options[] = {
+			{"decrypt",	required_argument,	0,	'd'},
 			{"encrypt",	required_argument,	0,	'e'},
 			{"key-file",	required_argument,	0,	'k'},
 			{"key-gen",	no_argument,		0,	'g'},
@@ -31,13 +32,18 @@ int main(int argc, char* argv[]) {
 			{0,		0,			0,	0},
 		};
 
-		if ((opt = getopt_long(argc, argv, "b:e:ghk:o:", options, &option_index)) == -1)
+		if ((opt = getopt_long(argc, argv, "b:d:e:ghk:o:", options, &option_index)) == -1)
 			break;
 
 		switch (opt) {
 		case 'b':
 			nbytes = atoi(argv[optind-1]);
 			break;
+		case 'd':
+			message = argv[optind-1];
+			command++;
+			comm = 'd';
+			break;
 		case 'e':
 			message = argv[optind-1];
 			command++;
@@ -77,12 +83,12 @@ int main(int argc, char* argv[]) {
 		exit(EXIT_FAILURE);
 	}
 
-	if (comm == 'e') {
+	if (comm == 'e' || comm == 'd') {
 		if (keyfile == NULL) {
 			printf("No key specified: exit! \n");
 			exit(EXIT_FAILURE);
 		}
-		xor(message, keyfile, output);
+		xor(comm, message, keyfile, output);
 	} else if (comm == 'g') {
 		keyrand(nbytes, output);
 	}
@@ -90,9 +96,10 @@ int main(int argc, char* argv[]) {
 	exit(EXIT_SUCCESS);
 }
 
-void xor(char* mess, char* keyf, char* outp) {
+void xor(int ed, char* mess, char* keyf, char* outp) {
 
-	char* defoutp = "critt";
+	char* defenoutp = "critt";
+	char* defdeoutp = "decritt";
 
 	if (access(mess, F_OK) == -1) {
 		error(errno, errno, mess);
@@ -101,8 +108,13 @@ void xor(char* mess, char* keyf, char* outp) {
 	}
 
 	if (outp == NULL) {
-		printf("WARNING no output name specified using default value 'critt' \n");
-		outp = defoutp;
+		if (ed == 'e') {
+			printf("WARNING no output name specified using default value 'critt' \n");
+			outp = defenoutp;
+		} else if (ed == 'd') {
+			printf("WARNING no output name specified usign default value 'decritt' \n");
+			outp = defdeoutp;
+		}
 	}
 	FILE* mex = fopen(mess, "r");
 	FILE* keyx = fopen(keyf, "r");
@@ -122,7 +134,11 @@ void xor(char* mess, char* keyf, char* outp) {
 	fclose(keyx);
 	fclose(critt);
 
-	printf("Message successfully encrypted \n");
+	if (ed == 'e') {
+		printf("Message successfully encrypted \n");
+	} else if (ed == 'd') {
+		printf("Message successfully decrypted \n");
+	}
 
 	return;
 }
@@ -167,6 +183,7 @@ void help(char* av[]) {
 	printf("ONETIMEBLUH USAGE: \n");
 	printf("%s [COMMAND] [OPTIONS] \n \n", av[0]);
 	printf("COMMANDS: \n");
+	printf("-d, --decrypt=FILE	decrypt message (input) same ad --encrypt, just for the feeling \n");
 	printf("-e, --encrypt=FILE	encrypt message (input) \n");
 	printf("-h, --help		print this help \n");
 	printf("-g, --key-gen		create key file \n \n");
-- 
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