From 56740c97f8c49847f5689f43b541994935dcbd3d Mon Sep 17 00:00:00 2001
From: Vicky Rampin <vicky@rampin.org>
Date: Sun, 24 Oct 2021 13:52:23 -0400
Subject: [PATCH] add caesar and encryption funcs

---
 index.py | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 index.py

diff --git a/index.py b/index.py
new file mode 100644
index 0000000..57a7253
--- /dev/null
+++ b/index.py
@@ -0,0 +1,36 @@
+import argparse
+
+
+def caesar(ptextletter, keyletter):
+    ptextNum = ord(ptextletter) - ord('A')
+    keyletterNum = ord(keyletter) - ord('A')
+    return chr((ptextNum + keyletterNum) % 26 + ord('A'))
+
+
+def encryption(plaintext, key):
+    ciphertext = ''
+    for i in range(len(plaintext)):
+        ciphertext += caesar(plaintext[i], key[i % len(key)])
+    return ciphertext
+
+
+def decryption(ciphertext, key):
+    return ciphertext
+
+
+def main():
+    # parse command line argument
+    parser = argparse.ArgumentParser()
+    parser.add_argument('--ptext', type=str)
+    parser.add_argument('--key', type=str)
+    args = parser.parse_args()
+
+    key = args.key
+    ciphertext = encryption(args.ptext, key)
+
+    print("Ciphertext: " + ciphertext)
+    print("Decrypted plaintext: " + decryption(ciphertext, key))
+
+
+if __name__ == '__main__':
+    main()