SimpleCrypt 0.1 (copied in for historical reasons)

3 files changed, 82 insertions, 0 deletions

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..eaa7d67
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,10 @@
+CFLAGS=-Wall -Wextra
+
+all:
+	make encrypt
+	make decrypt
+
+encrypt:	encrypt.c
+	gcc -o $@ $^ ${CFLAGS}
+decrypt:	decrypt.c
+	gcc -o $@ $^ ${CFLAGS}
diff --git a/decrypt.c b/decrypt.c
new file mode 100644
index 0000000..3f84bca
--- /dev/null
+++ b/decrypt.c
@@ -0,0 +1,36 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int main(int argc, char** argv) {
+	if(argc==0) {
+		fprintf(stderr, "Arguments fool!");
+		return 1;
+	}
+	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);
+	printf("Enter Passphrase:\n");
+	char passphrase[81];
+	fgets(passphrase, 81, stdin);
+	int passlen = strlen(passphrase) - 1;
+	int i=0,j=0;
+	for(i=0;i<length;i++) {
+		if(j==passlen) {
+			j=0;
+			i--;
+		} else {
+			filearr[i] -= passphrase[j];
+			j++;
+		}
+	}
+	file = fopen(argv[1], "w");
+	fwrite(filearr, 1, length, file);
+	fflush(file);
+	fclose(file);
+	return 0;
+}
diff --git a/encrypt.c b/encrypt.c
new file mode 100644
index 0000000..f37b5c0
--- /dev/null
+++ b/encrypt.c
@@ -0,0 +1,36 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int main(int argc, char** argv) {
+	if(argc==0) {
+		fprintf(stderr, "Arguments fool!");
+		return 1;
+	}
+	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);
+	printf("Enter Passphrase:\n");
+	char passphrase[81];
+	fgets(passphrase, 81, stdin);
+	int passlen = strlen(passphrase) - 1;
+	int i=0,j=0;
+	for(i=0;i<length;i++) {
+		if(j==passlen) {
+			j=0;
+			i--;
+		} else {
+			filearr[i] += passphrase[j];
+			j++;
+		}
+	}
+	file = fopen(argv[1], "w");
+	fwrite(filearr, 1, length, file);
+	fflush(file);
+	fclose(file);
+	return 0;
+}