Initial commit

18 files changed, 329 insertions, 0 deletions

diff --git a/10.ptf b/10.ptf
new file mode 100644
index 0000000..9763c7f
--- /dev/null
+++ b/10.ptf
diff --git a/11.ptf b/11.ptf
new file mode 100644
index 0000000..b14fc1d
--- /dev/null
+++ b/11.ptf
diff --git a/12.ptf b/12.ptf
new file mode 100644
index 0000000..eb9716e
--- /dev/null
+++ b/12.ptf
diff --git a/13.ptf b/13.ptf
new file mode 100644
index 0000000..c5518b5
--- /dev/null
+++ b/13.ptf
diff --git a/14.ptf b/14.ptf
new file mode 100644
index 0000000..cd541ca
--- /dev/null
+++ b/14.ptf
diff --git a/15.ptf b/15.ptf
new file mode 100644
index 0000000..92e2593
--- /dev/null
+++ b/15.ptf
diff --git a/16.ptf b/16.ptf
new file mode 100644
index 0000000..2a6e98a
--- /dev/null
+++ b/16.ptf
diff --git a/17.ptf b/17.ptf
new file mode 100644
index 0000000..0d376fb
--- /dev/null
+++ b/17.ptf
diff --git a/18.ptf b/18.ptf
new file mode 100644
index 0000000..7d0533d
--- /dev/null
+++ b/18.ptf
diff --git a/19.ptf b/19.ptf
new file mode 100644
index 0000000..8702b90
--- /dev/null
+++ b/19.ptf
diff --git a/20.ptf b/20.ptf
new file mode 100644
index 0000000..10529f1
--- /dev/null
+++ b/20.ptf
diff --git a/4.ptf b/4.ptf
new file mode 100644
index 0000000..741467d
--- /dev/null
+++ b/4.ptf
diff --git a/5.ptf b/5.ptf
new file mode 100644
index 0000000..64ec7c8
--- /dev/null
+++ b/5.ptf
diff --git a/6.ptf b/6.ptf
new file mode 100644
index 0000000..ccdff40
--- /dev/null
+++ b/6.ptf
diff --git a/7.ptf b/7.ptf
new file mode 100644
index 0000000..a7f5428
--- /dev/null
+++ b/7.ptf
diff --git a/8.ptf b/8.ptf
new file mode 100644
index 0000000..306ccc7
--- /dev/null
+++ b/8.ptf
diff --git a/9.ptf b/9.ptf
new file mode 100644
index 0000000..58cd6aa
--- /dev/null
+++ b/9.ptf
diff --git a/ptunxor.c b/ptunxor.c
new file mode 100644
index 0000000..bc41618
--- /dev/null
+++ b/ptunxor.c
@@ -0,0 +1,329 @@
+#include <stdio.h>
+#include <inttypes.h>
+#include <stdlib.h>
+
+int main(int argc, char** argv) {
+	FILE *fp;
+	unsigned char c0;
+	unsigned char c1;
+	unsigned char xor[256];
+	unsigned char ct;
+	unsigned char px;
+	unsigned char lutseenwild[16] = {
+						1, 1, 1, 0, 1, 1, 1, 1,
+						0, 0, 0, 1, 0, 1, 0, 0,
+					};
+	unsigned char lutvalid[16] = 	{
+						1, 1, 1, 0, 1, 1, 1, 1,
+						0, 0, 0, 1, 0, 1, 0, 0,
+					};
+	unsigned char lut[16][256] = {
+	/* 0 */	{
+			1, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 3, 3, 3, 3,
+			3, 3, 1, 1, 1, 1, 1, 1, 3, 3, 3, 3, 3, 3, 1, 1,
+			1, 1, 1, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 3,
+			3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 3, 3, 3, 3, 3,
+			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+			3, 1, 1, 1, 1, 1, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1,
+			1, 1, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 3, 3,
+			3, 3, 3, 1, 1, 1, 1, 1, 1, 3, 3, 3, 3, 3, 3, 1,
+			1, 1, 1, 1, 1, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1,
+			2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+			2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+			2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+			2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+		},
+	/* 1 */	{
+			3, 1, 1, 3, 3, 3, 1, 1, 3, 3, 3, 1, 1, 3, 3, 3,
+			1, 1, 3, 3, 3, 1, 1, 1, 3, 3, 1, 1, 1, 3, 3, 1,
+			1, 1, 3, 3, 1, 1, 1, 3, 3, 1, 3, 1, 3, 3, 3, 1,
+			1, 3, 3, 3, 1, 1, 3, 3, 3, 1, 1, 3, 3, 3, 1, 1,
+			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+			1, 3, 3, 1, 1, 1, 3, 3, 1, 1, 1, 3, 3, 1, 1, 1,
+			3, 3, 1, 1, 1, 3, 3, 3, 1, 1, 3, 3, 3, 1, 1, 3,
+			3, 3, 1, 1, 3, 3, 3, 1, 1, 3, 1, 3, 1, 1, 1, 3,
+			3, 1, 1, 1, 3, 3, 1, 1, 1, 3, 3, 1, 1, 1, 3, 3,
+			2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+			2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+			2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+			2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+		},
+	/* 2 */	{	
+			1, 3, 1, 3, 3, 1, 3, 1, 1, 3, 1, 3, 3, 1, 3, 1,
+			1, 3, 1, 1, 3, 1, 3, 3, 1, 3, 1, 1, 3, 1, 3, 3,
+			3, 3, 3, 1, 3, 1, 1, 3, 1, 3, 3, 1, 3, 1, 1, 3,
+			1, 1, 3, 1, 3, 3, 1, 3, 1, 1, 3, 1, 3, 3, 1, 3,
+			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+			3, 1, 3, 1, 1, 3, 1, 3, 3, 1, 3, 1, 1, 3, 1, 3,
+			3, 1, 3, 3, 1, 3, 1, 1, 3, 1, 3, 3, 1, 3, 1, 1,
+			1, 1, 1, 3, 1, 3, 3, 1, 3, 1, 1, 3, 1, 3, 3, 1,
+			3, 3, 1, 3, 1, 1, 3, 1, 3, 3, 1, 3, 1, 1, 3, 1,
+			2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+			2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+			2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+			2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+		},
+	/* 3 */	{},
+	/* 4 */	{
+			1, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1,
+			3, 1, 3, 1, 3, 1, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3,
+			1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 1, 3, 3, 3, 1,
+			3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1,
+			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+			3, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3,
+			1, 3, 1, 3, 1, 3, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1,
+			3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 3, 1, 3, 1, 3,
+			1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3,
+			2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+			2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+			2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+			2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+
+		},
+	/* 5 */	{	3, 3, 1, 1, 3, 1, 1, 3, 3, 1, 3, 3, 1, 1, 3, 1,
+			1, 3, 3, 1, 3, 3, 1, 3, 3, 1, 1, 3, 1, 1, 3, 3,
+			1, 3, 3, 1, 1, 3, 1, 1, 3, 3, 1, 3, 3, 1, 3, 3,
+			1, 1, 3, 1, 1, 3, 3, 1, 3, 3, 1, 1, 3, 1, 1, 3,
+			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+			1, 1, 3, 3, 1, 3, 3, 1, 1, 3, 1, 1, 3, 3, 1, 3,
+			3, 1, 1, 3, 1, 1, 3, 1, 1, 3, 3, 1, 3, 3, 1, 1,
+			3, 1, 1, 3, 3, 1, 3, 3, 1, 1, 3, 1, 1, 3, 1, 1,
+			3, 3, 1, 3, 3, 1, 1, 3, 1, 1, 3, 3, 1, 3, 3, 1,
+			2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+			2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+			2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+			2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+		},
+	/* 6 */	{	1, 1, 1, 1, 3, 3, 3, 3, 1, 1, 1, 1, 3, 3, 3, 3,
+			1, 1, 1, 3, 3, 3, 3, 1, 1, 1, 1, 3, 3, 3, 3, 1,
+			1, 1, 3, 3, 3, 3, 1, 1, 1, 1, 3, 3, 3, 3, 1, 1,
+			1, 3, 3, 3, 3, 1, 1, 1, 1, 3, 3, 3, 3, 1, 1, 1,
+			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+			3, 3, 3, 3, 1, 1, 1, 1, 3, 3, 3, 3, 1, 1, 1, 1,
+			3, 3, 3, 1, 1, 1, 1, 3, 3, 3, 3, 1, 1, 1, 1, 3,
+			3, 3, 1, 1, 1, 1, 3, 3, 3, 3, 1, 1, 1, 1, 3, 3,
+			3, 1, 1, 1, 1, 3, 3, 3, 3, 1, 1, 1, 1, 3, 3, 3,
+			2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+			2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+			2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+			2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+		},
+	/* 7 */	{
+			1, 1, 3, 3, 1, 1, 3, 3, 1, 1, 3, 3, 1, 1, 3, 3,
+			1, 1, 3, 3, 1, 1, 3, 3, 1, 1, 3, 3, 1, 1, 3, 3,
+			1, 3, 3, 1, 1, 3, 3, 1, 1, 3, 3, 1, 1, 3, 3, 1,
+			1, 3, 3, 1, 1, 3, 3, 1, 1, 3, 3, 1, 1, 3, 3, 1,
+			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+			3, 3, 1, 1, 3, 3, 1, 1, 3, 3, 1, 1, 3, 3, 1, 1,
+			3, 3, 1, 1, 3, 3, 1, 1, 3, 3, 1, 1, 3, 3, 1, 1,
+			3, 1, 1, 3, 3, 1, 1, 3, 3, 1, 1, 3, 3, 1, 1, 3,
+			3, 1, 1, 3, 3, 1, 1, 3, 3, 1, 1, 3, 3, 1, 1, 3,
+			2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+			2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+			2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+			2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+		},
+	/* 8 */	{},
+	/* 9 */	{},
+	/* a */	{},
+	/* b */	{
+			1, 3, 3, 1, 1, 3, 3, 1, 1, 3, 3, 1, 1, 3, 3, 1,
+			1, 3, 3, 1, 1, 3, 3, 1, 1, 3, 3, 1, 1, 3, 3, 1,
+			1, 1, 3, 3, 1, 1, 3, 3, 1, 1, 3, 3, 1, 1, 3, 3,
+			1, 1, 3, 3, 1, 1, 3, 3, 1, 1, 3, 3, 1, 1, 3, 3,
+			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+			3, 1, 1, 3, 3, 1, 1, 3, 3, 1, 1, 3, 3, 1, 1, 3,
+			3, 1, 1, 3, 3, 1, 1, 3, 3, 1, 1, 3, 3, 1, 1, 3,
+			3, 3, 1, 1, 3, 3, 1, 1, 3, 3, 1, 1, 3, 3, 1, 1,
+			3, 3, 1, 1, 3, 3, 1, 1, 3, 3, 1, 1, 3, 3, 1, 1,
+			2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+			2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+			2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+			2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+		},
+	/* c */	{},
+	/* d */	{
+			1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 3, 3, 3, 3, 3, 1,
+			1, 1, 1, 1, 1, 1, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1,
+			1, 1, 1, 1, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1,
+			1, 1, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1,
+			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+			3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 3,
+			3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 3, 3, 3,
+			3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 3, 3, 3, 3, 3,
+			3, 3, 1, 1, 1, 1, 1, 1, 1, 3, 3, 3, 3, 3, 3, 3,
+			2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+			2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+			2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+			2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+
+		},
+	/* e */	{},
+	/* f */	{}
+	};
+
+	uint16_t i;
+	int j;
+	int li;
+	int len;
+	unsigned char message;
+	int blocks;
+	int bl;
+
+	fp = fopen(argv[1], "rb");
+	fseek(fp, 0, SEEK_END);
+	len = ftell(fp);
+	fseek(fp, 0x40, SEEK_SET);
+	fread(&c0, 1, 1, fp);
+	fread(&c1, 1, 1, fp);
+	i = 2;
+
+	fseek(fp, 0x0, SEEK_SET);
+
+	switch (c0) {
+	case 0x00:
+		fprintf(stderr, "Success! easy one\n");
+		xor[0] = c0;
+		xor[1] = c1;
+		for (i = 2; i < 64; i++) {
+			xor[i] = (xor[i-1] + c1 - c0) & 0xff;
+		}
+		
+		px = xor[0];
+		fread(&ct, 1, 1, fp);
+		message = px ^ ct;
+		printf("%c", message);
+
+		px  = xor[1];
+		fread(&ct, 1, 1, fp);
+		message = px ^ ct;
+		printf("%c", message);
+
+		i = 2;
+		while (fread(&ct, 1, 1, fp) != 0) {
+			if (i%64 == 0) {
+				i = 0;
+			}
+			message = xor[i] ^ ct;
+			printf("%c", message);
+			i++;
+		}
+		break;
+	case 0x80:
+		fprintf(stderr, "Success! easy two\n");
+		xor[0] = c0;
+		xor[1] = c1;
+		for (i = 2; i < 256; i++) {
+			if (i%64 == 0) {
+				xor[i] = c0;
+			} else {
+				xor[i] = ((xor[i-1] + c1 - c0) & 0xff);
+			}
+		}
+		
+		for (i = 0; i < 64; i++) {
+			xor[i] ^= 0x80;
+		}
+		for (i = 128; i < 192; i++) {
+			xor[i] ^= 0x80;
+		}
+
+		px = xor[0];
+		fread(&ct, 1, 1, fp);
+		message = px ^ ct;
+		printf("%c", message);
+
+		px  = xor[1];
+		fread(&ct, 1, 1, fp);
+		message = px ^ ct;
+		printf("%c", message);
+
+		i = 2;
+		while (fread(&ct, 1, 1, fp) != 0) {
+			if (i%256 == 0) {
+				i = 0;
+			}
+			message = xor[i] ^ ct;
+			printf("%c", message);
+			i++;
+		}
+		break;
+		
+	case 0x40:
+	case 0xc0:
+		li = (((c1 & 0xf0) >> 4) + (c1 & 0x0f)) & 0xf;
+		if (lutvalid[li]) {
+			fprintf(stderr, "Success! Found lookup table 0x%x\n", li);
+		} else {
+			fprintf(stderr, "Can't find lookup table for c1=%x 0x%x\n", c1, li);
+		}
+		xor[0] = c0;
+		xor[1] = c1;
+		for (i = 2; i < 256; i++) {
+			if (i%64 == 0) {
+				xor[i] = c0;
+			} else {
+				xor[i] = ((xor[i-1] + c1 - c0) & 0xff);
+			}
+		}
+		
+		for (i = 0; i < 256; i++) {
+			xor[i] ^= (lut[li][i] * 0x40);
+		}
+
+		px = xor[0];
+		fread(&ct, 1, 1, fp);
+		message = px ^ ct;
+		printf("%c", message);
+
+		px  = xor[1];
+		fread(&ct, 1, 1, fp);
+		message = px ^ ct;
+		printf("%c", message);
+
+		i = 2;
+		while (fread(&ct, 1, 1, fp) != 0) {
+			if (i%256 == 0) {
+				i = 0;
+			}
+			message = xor[i] ^ ct;
+			printf("%c", message);
+			i++;
+		}
+		break;
+	default:
+		fprintf(stderr, "Failed c[0] c[1]: %02x %02x\n", c0, c1);
+	}
+		
+	fclose(fp);
+	return 0;
+}
+
+