Add .gitignore

Author: tosbaha

.gitignore

@@ -0,0 +1,23 @@
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+.pnpm-debug.log*
+
+# Dependency directories
+node_modules/
+
+# Environments
+.env
+env/
+
+# macOS
+.DS_Store

ctf/README.md

@@ -0,0 +1 @@
+This folder will have the codes that I used for CTF challenges.

ctf/flare-on-2021/01-02/1.py

@@ -0,0 +1,2 @@
+import base64
+print(base64.b64encode(b'goldenticket'))

ctf/flare-on-2021/01-02/2.py

@@ -0,0 +1,16 @@
+png_header = bytearray([0x89,0x50,0x4E,0x47, 0x0D, 0x0A, 0x1A, 0x0A])
+encrypted =  bytearray([0xC7,0xC7,0x25,0x1D,0x63,0x0D,0xF3,0x56])
+
+def ROR(data, shift, size=32):
+    shift %= size
+    body = data >> shift
+    remains = (data << (size - shift)) - (body << size)
+    return (body + remains)
+result = ''
+for i in range(len(png_header)):
+    key = png_header[i]
+    key += i % 0xFF
+    key = ROR(key,i) % 0xFF
+    key = key ^ encrypted[i]
+    result += chr(key)
+print(result)