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22 lines
842 B
22 lines
842 B
from Crypto.Cipher import AES
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import base64
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def decrypt_aes_gcm(encrypted_base64, key_base64):
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# Decode the base64 encoded data and key
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encrypted_data = base64.b64decode(encrypted_base64)
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key = base64.b64decode(key_base64)
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# Extract the nonce, tag, and ciphertext from the combined encrypted data
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nonce = encrypted_data[:12] # AES GCM nonce is 12 bytes
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tag = encrypted_data[-16:] # AES GCM tag is 16 bytes
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ciphertext = encrypted_data[12:-16] # Ciphertext is everything in between
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# Create the cipher object and decrypt the data
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cipher = AES.new(key, AES.MODE_GCM, nonce=nonce)
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decrypted_data = cipher.decrypt_and_verify(ciphertext, tag)
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# Convert decrypted bytes to string (assuming UTF-8 encoding)
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decrypted_text = decrypted_data.decode('utf-8')
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return decrypted_text
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