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  1. import base64
  2. import os
  3. from cryptography.hazmat.primitives.ciphers.aead import AESGCM
  4.  
  5. base64_key = "nCrksJzTgZCK3zPYH2z0oHDM6Py2mThHcjqxGPpR6nA="
  6.  
  7. def encrypt(plaintext):
  8.     key = base64.b64decode(base64_key)
  9.     aesgcm = AESGCM(key)
  10.  
  11.     nonce = os.urandom(12)
  12.     plaintext_bytes = plaintext.encode('utf-8')
  13.  
  14.     ciphertext = aesgcm.encrypt(nonce, plaintext_bytes, None)
  15.     encrypted = nonce + ciphertext
  16.  
  17.     return base64.b64encode(encrypted)
  18.  
  19. def decrypt(encrypted_base64):
  20.     try:
  21.         if not encrypted_base64:
  22.             print("Encrypted input is null or empty")
  23.             return ""
  24.  
  25.         key = base64.b64decode(base64_key)
  26.         encrypted_bytes = base64.b64decode(encrypted_base64)
  27.  
  28.         if len(encrypted_bytes) < 13:
  29.             print("Encrypted input too short")
  30.             return ""
  31.  
  32.         nonce = encrypted_bytes[:12]
  33.         ciphertext = encrypted_bytes[12:]
  34.  
  35.         aesgcm = AESGCM(key)
  36.         plaintext_bytes = aesgcm.decrypt(nonce, ciphertext, None)
  37.  
  38.         return plaintext_bytes.decode('utf-8')
  39.  
  40.     except Exception as e:
  41.         print("Decryption failed:", e)
  42.         return ""
  43.  
  44. # Test
  45. if __name__ == "__main__":
  46.     original_text = "Hello from Python AES-GCM!"
  47.     print("Original:", original_text)
  48.  
  49.     encrypted = encrypt(original_text)
  50.     print("Encrypted:", encrypted)
  51.  
  52.     decrypted = decrypt(encrypted)
  53.     print("Decrypted:", decrypted)
  54.  
Success #stdin #stdout 0.12s 21288KB
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stdin
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Standard input is empty
stdout
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('Original:', 'Hello from Python AES-GCM!')
('Encrypted:', 'ZwwKMe9dvDy8tcz/u5Ho8St2sZ2E3nwy0UZn1BPzsPZviayg3DtW7JJDTbxsSW66Pw/T+s7G')
('Decrypted:', u'Hello from Python AES-GCM!')
https://ideone.com/Ye1mXM
language:
Python (cpython 2.7.16)
created:
10 days ago
visibility:
public

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