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from Crypto.Cipher import AES
from Crypto.Util.Padding import pad, unpad
import base64
def encrypt(message: str, key: str) -> str:
"""Encrypt error message using AES-128"""
# Convert the key to bytes and ensure it's 16 bytes (128 bits)
key_bytes = key.encode('utf-8')[:16].ljust(16, b'\0')
# Create cipher
cipher = AES.new(key_bytes, AES.MODE_CBC)
# Pad and encrypt the message
ct_bytes = cipher.encrypt(pad(message.encode('utf-8'), AES.block_size))
# Combine IV and ciphertext and encode as base64
encrypted = base64.b16encode(cipher.iv + ct_bytes).decode('utf-8')
return encrypted
def decrypt(encrypted: str, key: str) -> str:
"""Decrypt AES-128 encrypted message"""
# Convert the key to bytes and ensure it's 16 bytes (128 bits)
key_bytes = key.encode('utf-8')[:16].ljust(16, b'\0')
# Decode the base64 message
enc_bytes = base64.b16decode(encrypted)
# Extract IV (first 16 bytes) and ciphertext
iv = enc_bytes[:16]
ct_bytes = enc_bytes[16:]
# Create cipher with same key and IV
cipher = AES.new(key_bytes, AES.MODE_CBC, iv)
# Decrypt and unpad the message
pt_bytes = unpad(cipher.decrypt(ct_bytes), AES.block_size)
# Convert back to string
return pt_bytes.decode('utf-8')
if __name__ == "__main__":
decrypted = decrypt("8HF8LyqjywlLR6DglBkvMxG2qdcAGiC2WHga8P982exv6fp/EXmrcwp6vYiZ1lVS/6nv+xJ72Nd6xV9cya6w3yjBr70U0ziiOtsyKFWAzLNa/swvZn9Ses2ZIbq/nZfkRv+Va19GqwPxV6mDpbuZp0Tl4VQtxJth+RzVX74i71G4mpp5luW8GTZSlnU+KPI8m6BbNKWXYou6ttS41IJubA==", "1923a821")
print(decrypted)
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