From 35748b207e9b32e59fb391d25d9fe8b4da403855 Mon Sep 17 00:00:00 2001
From: Seppia <seppia@seppio.fish>
Date: Thu, 5 Jul 2018 16:17:55 +0200
Subject: encrypt/decrypt functions

The encrypt and decrypt operations have been moved to functions that
take input from string or file, and corrispondent code has been
changed accordingly.
---
 src/onetimebluh.c | 70 ++++++++++++++++++++++++++++++++++++++++---------------
 1 file changed, 51 insertions(+), 19 deletions(-)

(limited to 'src')

diff --git a/src/onetimebluh.c b/src/onetimebluh.c
index 08f147d..dce4a6b 100644
--- a/src/onetimebluh.c
+++ b/src/onetimebluh.c
@@ -19,6 +19,8 @@ typedef struct opts {
 } Opts;
 
 char* readInput (FILE* input, uint64_t size);
+char* cryptXor (char* inputStr, FILE* keyFile);
+char* fcryptXor (FILE* inputFile, FILE* keyFile);
 void xor (Opts* opzioni);                           /* operates the bitwise XOR between mess and keyf and puts the output to outp */
 void keyrand (Opts* opzioni);                       /* generates random numbers using RAND_bytes from openssl and puts them into outp */
 void bluh (Opts* opzioni);                          /* performs the binary dump of the input file and prints that to outp */
@@ -198,6 +200,50 @@ char* readInput (FILE* stdinput, uint64_t size) {
 	return realloc (input, sizeof (char) * length);
 }
 
+char* cryptXor (char* inputStr, FILE* keyFile) {
+
+	int64_t i;
+	char in1, in2;
+	int64_t inputSize = strlen (inputStr);
+	char* bytes = malloc (inputSize);
+
+	fseek (keyFile, 0L, SEEK_END);
+	int64_t keySize = ftell (keyFile);
+	fseek (keyFile, (keySize - inputSize), SEEK_SET);
+
+	for (i = 0; i < inputSize; i ++) {
+		in1 = inputStr[i];
+		fscanf (keyFile, "%c", &in2);
+		bytes[i] = in1 ^ in2;
+	}
+
+	return bytes;
+}
+
+char* fcryptXor (FILE* inputFile, FILE* keyFile) {
+
+	int64_t i;
+	char in1, in2;
+
+	fseek (inputFile, 0L, SEEK_END);
+	int64_t inputSize = ftell (inputFile);
+	rewind (inputFile);
+
+	char* bytes = malloc (inputSize);
+
+	fseek (keyFile, 0L, SEEK_END);
+	int64_t keySize = ftell (keyFile);
+	fseek (keyFile, (keySize - inputSize), SEEK_SET);
+
+	for (i = 0; i < inputSize; i ++) {
+		fscanf (inputFile, "%c", &in1);
+		fscanf (keyFile, "%c", &in2);
+		bytes[i] = in1 ^ in2;
+	}
+
+	return bytes;
+}
+
 void xor (Opts* opzioni) {
 
 	char* input;
@@ -219,7 +265,6 @@ void xor (Opts* opzioni) {
 	}
 
 	int64_t mess_size;
-	int64_t pad_size;
 
 	if (opzioni->input) {
 		fseek (mex, 0L, SEEK_END);
@@ -229,27 +274,12 @@ void xor (Opts* opzioni) {
 		mess_size = strlen (input);
 	}
 
-	fseek (keyx, 0L, SEEK_END);
-	pad_size = ftell (keyx);
-	fseek (keyx, (pad_size - mess_size), SEEK_SET);
-
-	char* bytes = malloc (mess_size);
-
-	int64_t i;
-	char a, b;
+	char* bytes;
 
 	if (opzioni->input) {
-		for (i = 0; i < mess_size; i ++) {
-			fscanf (mex, "%c", &a);
-			fscanf (keyx, "%c", &b);
-			bytes[i] = a ^ b;
-		}
+		bytes = fcryptXor (mex, keyx);
 	} else if (!opzioni->input) {
-		for (i = 0; i < mess_size; i ++) {
-			a = input[i];
-			fscanf (keyx, "%c", &b);
-			bytes[i] = a ^ b;
-		}
+		bytes = cryptXor (input, keyx);
 	}
 
 	if (opzioni->output) {
@@ -268,6 +298,8 @@ void xor (Opts* opzioni) {
 
 
 	if (opzioni->tear) {
+		fseek (keyx, 0L, SEEK_END);
+		int64_t pad_size = ftell (keyx);
 		ftruncate (fileno (keyx), (pad_size - mess_size));
 		fseek (keyx, 0L, SEEK_END);
 		int64_t new_pad_size = ftell (keyx);
-- 
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