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