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#! /usr/bin/env python
# encoding: utf-8
# Matt Clarkson, 2012
'''
DPAPI access library (http://msdn.microsoft.com/en-us/library/ms995355.aspx)
This file uses code originally created by Crusher Joe:
http://article.gmane.org/gmane.comp.python.ctypes/420
And modified by Wayne Koorts:
http://stackoverflow.com/questions/463832/using-dpapi-with-python
'''
from ctypes import windll, byref, cdll, Structure, POINTER, c_char, c_buffer
from ctypes.wintypes import DWORD
from waflib.Configure import conf
LocalFree = windll.kernel32.LocalFree
memcpy = cdll.msvcrt.memcpy
CryptProtectData = windll.crypt32.CryptProtectData
CryptUnprotectData = windll.crypt32.CryptUnprotectData
CRYPTPROTECT_UI_FORBIDDEN = 0x01
try:
extra_entropy = 'cl;ad13 \0al;323kjd #(adl;k$#ajsd'.encode('ascii')
except AttributeError:
extra_entropy = 'cl;ad13 \0al;323kjd #(adl;k$#ajsd'
class DATA_BLOB(Structure):
_fields_ = [
('cbData', DWORD),
('pbData', POINTER(c_char))
]
def get_data(blob_out):
cbData = int(blob_out.cbData)
pbData = blob_out.pbData
buffer = c_buffer(cbData)
memcpy(buffer, pbData, cbData)
LocalFree(pbData)
return buffer.raw
@conf
def dpapi_encrypt_data(self, input_bytes, entropy = extra_entropy):
'''
Encrypts data and returns byte string
:param input_bytes: The data to be encrypted
:type input_bytes: String or Bytes
:param entropy: Extra entropy to add to the encryption process (optional)
:type entropy: String or Bytes
'''
if not isinstance(input_bytes, bytes) or not isinstance(entropy, bytes):
self.fatal('The inputs to dpapi must be bytes')
buffer_in = c_buffer(input_bytes, len(input_bytes))
buffer_entropy = c_buffer(entropy, len(entropy))
blob_in = DATA_BLOB(len(input_bytes), buffer_in)
blob_entropy = DATA_BLOB(len(entropy), buffer_entropy)
blob_out = DATA_BLOB()
if CryptProtectData(byref(blob_in), 'python_data', byref(blob_entropy),
None, None, CRYPTPROTECT_UI_FORBIDDEN, byref(blob_out)):
return get_data(blob_out)
else:
self.fatal('Failed to decrypt data')
@conf
def dpapi_decrypt_data(self, encrypted_bytes, entropy = extra_entropy):
'''
Decrypts data and returns byte string
:param encrypted_bytes: The encrypted data
:type encrypted_bytes: Bytes
:param entropy: Extra entropy to add to the encryption process (optional)
:type entropy: String or Bytes
'''
if not isinstance(encrypted_bytes, bytes) or not isinstance(entropy, bytes):
self.fatal('The inputs to dpapi must be bytes')
buffer_in = c_buffer(encrypted_bytes, len(encrypted_bytes))
buffer_entropy = c_buffer(entropy, len(entropy))
blob_in = DATA_BLOB(len(encrypted_bytes), buffer_in)
blob_entropy = DATA_BLOB(len(entropy), buffer_entropy)
blob_out = DATA_BLOB()
if CryptUnprotectData(byref(blob_in), None, byref(blob_entropy), None,
None, CRYPTPROTECT_UI_FORBIDDEN, byref(blob_out)):
return get_data(blob_out)
else:
self.fatal('Failed to decrypt data')
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