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diff --git a/waflib/extras/dpapi.py b/waflib/extras/dpapi.py
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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')
+