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125 lines
3.3 KiB
Python
125 lines
3.3 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 - 2019, 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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from __future__ import division
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import base64
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import hashlib
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import os
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import six
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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, six.text_type):
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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, six.text_type):
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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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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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