79 lines
2.1 KiB
Python
79 lines
2.1 KiB
Python
##########################################################################
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#
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# pgAdmin 4 - PostgreSQL Tools
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#
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# Copyright (C) 2013 - 2026, The pgAdmin Development Team
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# This software is released under the PostgreSQL Licence
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#
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#########################################################################
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"""This File Provides Cryptography."""
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import base64
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import hashlib
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import os
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from cryptography.hazmat.backends import default_backend
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from cryptography.hazmat.primitives.ciphers import Cipher
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from cryptography.hazmat.primitives.ciphers.algorithms import AES
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from cryptography.hazmat.primitives.ciphers.modes import CFB8
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padding_string = b'}'
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iv_size = AES.block_size // 8
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def encrypt(plaintext, key):
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"""
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Encrypt the plaintext with AES method.
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Parameters:
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plaintext -- String to be encrypted.
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key -- Key for encryption.
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"""
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iv = os.urandom(iv_size)
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cipher = Cipher(AES(pad(key)), CFB8(iv), default_backend())
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encryptor = cipher.encryptor()
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# If user has entered non ascii password (Python2)
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# we have to encode it first
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if isinstance(plaintext, str):
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plaintext = plaintext.encode()
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return base64.b64encode(iv + encryptor.update(plaintext) +
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encryptor.finalize())
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def decrypt(ciphertext, key):
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"""
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Decrypt the AES encrypted string.
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Parameters:
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ciphertext -- Encrypted string with AES method.
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key -- key to decrypt the encrypted string.
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"""
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ciphertext = base64.b64decode(ciphertext)
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iv = ciphertext[:iv_size]
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cipher = Cipher(AES(pad(key)), CFB8(iv), default_backend())
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decryptor = cipher.decryptor()
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return decryptor.update(ciphertext[iv_size:]) + decryptor.finalize()
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def pad(key):
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"""Add padding to the key."""
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if isinstance(key, str):
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key = key.encode()
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# Key must be maximum 32 bytes long, so take first 32 bytes
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key = key[:32]
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# If key size is 16, 24 or 32 bytes then padding is not required
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if len(key) in (16, 24, 32):
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return key
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# Add padding to make key 32 bytes long
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return key.ljust(32, padding_string)
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