From 8f3c51cc4cbc0fe456d1dc1bfcc666cfee78623b Mon Sep 17 00:00:00 2001
From: Nathan Lasseter <nathan.je.lasseter@googlemail.com>
Date: Tue, 5 Jun 2012 19:42:14 +0100
Subject: SimpleCrypt 0.2 (copied in for historical reasons)

---
 Makefile  | 18 +++++++++++++++---
 decrypt.c | 41 ++++++++++++++++++++++++-----------------
 encrypt.c | 44 ++++++++++++++++++++++++++------------------
 3 files changed, 65 insertions(+), 38 deletions(-)

diff --git a/Makefile b/Makefile
index eaa7d67..df7fbd6 100644
--- a/Makefile
+++ b/Makefile
@@ -1,10 +1,22 @@
-CFLAGS=-Wall -Wextra
+CFLAGS=-Wall -Wextra -O3
 
 all:
 	make encrypt
 	make decrypt
 
 encrypt:	encrypt.c
-	gcc -o $@ $^ ${CFLAGS}
+	gcc ${CFLAGS} -o $@ $^
 decrypt:	decrypt.c
-	gcc -o $@ $^ ${CFLAGS}
+	gcc ${CFLAGS} -o $@ $^
+
+install:
+	cp encrypt /usr/local/bin/encrypt
+	cp decrypt /usr/local/bin/decrypt
+
+uninstall:
+	rm /usr/local/bin/sc-encrypt
+	rm /usr/local/bin/sc-decrypt
+
+clean:
+	rm encrypt
+	rm decrypt
diff --git a/decrypt.c b/decrypt.c
index 3f84bca..b068bb9 100644
--- a/decrypt.c
+++ b/decrypt.c
@@ -1,36 +1,43 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <unistd.h>
 
 int main(int argc, char** argv) {
-	if(argc==0) {
+	/* We need a file to encrypt */
+	if(argc==1) {
 		fprintf(stderr, "Arguments fool!");
 		return 1;
 	}
+	/* Now lets open that file */
 	FILE* file = fopen(argv[1], "r");
-	fseek(file, 0, SEEK_END);
-	int length = ftell(file);
-	fseek(file, 0, SEEK_SET);
-	char filearr[length];
-	fread(filearr, length, 1, file);
-	fclose(file);
+	/* And a temporary file to hold the encrypted data */
+	char tpath[255] = "/tmp/";
+	strcat(tpath, argv[1]);
+	FILE* temp = fopen(tpath, "w");
+	/* Now we need the passphrase. Get it */
 	printf("Enter Passphrase:\n");
-	char passphrase[81];
-	fgets(passphrase, 81, stdin);
+	char passphrase[255];
+	fgets(passphrase, 255, stdin);
 	int passlen = strlen(passphrase) - 1;
-	int i=0,j=0;
-	for(i=0;i<length;i++) {
+	int c,j=0;
+	/* Now we encrypt! */
+	while((c=fgetc(file)) != EOF) {
 		if(j==passlen) {
-			j=0;
-			i--;
+			fputc(c-passphrase[0], temp);
+			j=1;
 		} else {
-			filearr[i] -= passphrase[j];
+			fputc(c-passphrase[j], temp);
 			j++;
 		}
 	}
-	file = fopen(argv[1], "w");
-	fwrite(filearr, 1, length, file);
-	fflush(file);
+	/* Close the files */
+	fflush(temp);
+	fclose(temp);
 	fclose(file);
+	/* Move the file back */
+	char cmd[255];
+	sprintf(cmd, "%s %s %s", "/bin/mv", tpath, argv[1]);
+	system(cmd);
 	return 0;
 }
diff --git a/encrypt.c b/encrypt.c
index f37b5c0..77249fd 100644
--- a/encrypt.c
+++ b/encrypt.c
@@ -1,36 +1,44 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <unistd.h>
 
 int main(int argc, char** argv) {
-	if(argc==0) {
+	/* We need a file to encrypt */
+	if(argc==1) {
 		fprintf(stderr, "Arguments fool!");
 		return 1;
 	}
+	/* Now lets open that file */
 	FILE* file = fopen(argv[1], "r");
-	fseek(file, 0, SEEK_END);
-	int length = ftell(file);
-	fseek(file, 0, SEEK_SET);
-	char filearr[length];
-	fread(filearr, length, 1, file);
-	fclose(file);
+	/* And a temporary file to hold the encrypted data */
+	char tpath[255] = "/tmp/";
+	strcat(tpath, argv[1]);
+	FILE* temp = fopen(tpath, "w");
+	/* Now we need the passphrase. Get it */
 	printf("Enter Passphrase:\n");
-	char passphrase[81];
-	fgets(passphrase, 81, stdin);
+	char passphrase[255];
+	fgets(passphrase, 255, stdin);
 	int passlen = strlen(passphrase) - 1;
-	int i=0,j=0;
-	for(i=0;i<length;i++) {
-		if(j==passlen) {
-			j=0;
-			i--;
+	int c,j=0;
+	/* Now we encrypt! */
+	while((c=fgetc(file)) != EOF) {
+	if(j==passlen) {
+			fputc(c+passphrase[0], temp);
+			j=1;
 		} else {
-			filearr[i] += passphrase[j];
+			fputc(c+passphrase[j], temp);
 			j++;
 		}
 	}
-	file = fopen(argv[1], "w");
-	fwrite(filearr, 1, length, file);
-	fflush(file);
+	/* Close the files */
+	fflush(temp);
+	fclose(temp);
 	fclose(file);
+	/* Move the file back */
+	char cmd[255];
+	sprintf(cmd, "%s %s %s", "/bin/mv", tpath, argv[1]);
+	system(cmd);
 	return 0;
 }
+
-- 
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