solve.py

import binascii

def xor(s1,s2):
    return ''.join(chr(ord(a) ^ ord(b)) for a, b in zip(s1, s2))

def unxor(s1,s2):
    return ''.join(chr(ord(a) ^ b) for a, b in zip(s1, s2))

def encrypt(a):  
    some_text = a[::2]

    randnum = 14
    text_length = len(some_text)
    endtext = ""
    for i in range(1, text_length + 1):
      weirdtext = some_text[i - 1]
      if weirdtext >= "a" and weirdtext <= "z":
          weirdtext = chr(ord(weirdtext) + randnum)
          if weirdtext > "z":
              weirdtext = chr(ord(weirdtext) - 26)
      endtext += weirdtext
    randtext = a[1::2]

    xored = xor("aaaaaaaaaaaaaaa", randtext)
    hex_xored = xored.encode("utf-8").hex()

    return endtext + ' ' + hex_xored

def decrypt(msg):
    # let's just throw a space in there manually, that seems easier.
    endtext, hex_xored = msg.strip().rstrip().split(" ")

    randnum = 14
    some_text = ""
    for i in range(1, len(endtext) + 1):
        weirdtext = endtext[i - 1]
        if weirdtext >= "a" and weirdtext <= "z":
            weirdtext = chr(ord(weirdtext) - randnum)
            if weirdtext < "a":
                weirdtext = chr(ord(weirdtext) + 26)
        some_text += weirdtext
    
    xored = binascii.unhexlify(hex_xored)
    randtext = unxor("aaaaaaaaaaaaaaa", xored)

    cleartext = "\n"
    for a, b in zip(some_text, randtext):
        cleartext += a + b

    return cleartext

def main(): 
    opt = input("Would you like to [E]ncrypt or [D]ecrypt? ")
    if opt[:1].lower() == "e":
        msg = input("Enter message to encrypt: ")
        print(f"Encrypted message: {encrypt(msg)}")
    elif opt[:1].lower() == "d":
        msg = input("Enter message to decrypt: ")
        print(f"Decrypted message: {decrypt(msg)}")

if __name__ == "__main__":
    main()