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123 lines
3.2 KiB
Python
123 lines
3.2 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 - 2018, 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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from Crypto import Random
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from Crypto.Cipher import AES
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padding_string = b'}'
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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 = Random.new().read(AES.block_size)
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key = pad(key).encode('utf-8')
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cipher = AES.new(key, AES.MODE_CFB, iv)
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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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plaintext = plaintext.encode('utf-8')
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encrypted = base64.b64encode(iv + cipher.encrypt(plaintext))
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return encrypted
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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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global padding_string
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ciphertext = base64.b64decode(ciphertext)
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iv = ciphertext[:AES.block_size]
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key = pad(key).encode('utf-8')
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cipher = AES.new(key, AES.MODE_CFB, iv)
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decrypted = cipher.decrypt(ciphertext[AES.block_size:])
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return decrypted
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def pad(key):
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"""Add padding to the key."""
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global padding_string
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str_len = len(key)
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# Key must be maximum 32 bytes long, so take first 32 bytes
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if str_len > 32:
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return key[:32]
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# If key size id 16, 24 or 32 bytes then padding not require
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if str_len == 16 or str_len == 24 or str_len == 32:
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return key
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# Convert bytes to string (python3)
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if not hasattr(str, 'decode'):
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padding_string = padding_string.decode()
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# Add padding to make key 32 bytes long
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return key + ((32 - str_len % 32) * padding_string)
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def pqencryptpassword(password, user):
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"""
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pqencryptpassword -- to encrypt a password
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This is intended to be used by client applications that wish to send
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commands like ALTER USER joe PASSWORD 'pwd'. The password need not
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be sent in cleartext if it is encrypted on the client side. This is
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good because it ensures the cleartext password won't end up in logs,
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pg_stat displays, etc. We export the function so that clients won't
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be dependent on low-level details like whether the enceyption is MD5
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or something else.
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Arguments are the cleartext password, and the SQL name of the user it
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is for.
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Return value is "md5" followed by a 32-hex-digit MD5 checksum..
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Args:
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password:
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user:
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Returns:
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"""
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m = hashlib.md5()
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# Place salt at the end because it may be known by users trying to crack
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# the MD5 output.
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# Handling of non-ascii password (Python2)
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if hasattr(str, 'decode'):
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password = password.encode('utf-8')
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user = user.encode('utf-8')
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else:
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password = password.encode()
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user = user.encode()
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m.update(password)
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m.update(user)
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return "md5" + m.hexdigest()
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