68 lines
2.0 KiB
Python
68 lines
2.0 KiB
Python
import os
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import win32api
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import win32file
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import winerror
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def ReadCallback(input_buffer, data, buflen):
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fnamein, fnameout, f = data
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## print fnamein, fnameout, buflen
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f.write(input_buffer)
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## python 2.3 throws an error if return value is a plain int
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return winerror.ERROR_SUCCESS
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def WriteCallback(output_buffer, data, buflen):
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fnamebackup, fnameout, f = data
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file_data = f.read(buflen)
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## returning 0 as len terminates WriteEncryptedFileRaw
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output_len = len(file_data)
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output_buffer[:output_len] = file_data
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return winerror.ERROR_SUCCESS, output_len
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tmp_dir = win32api.GetTempPath()
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dst_dir = win32api.GetTempFileName(tmp_dir, "oef")[0]
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os.remove(dst_dir)
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os.mkdir(dst_dir)
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print("Destination dir:", dst_dir)
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## create an encrypted file
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fname = win32api.GetTempFileName(dst_dir, "ref")[0]
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print("orig file:", fname)
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f = open(fname, "w")
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f.write("xxxxxxxxxxxxxxxx\n" * 32768)
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f.close()
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## add a couple of extra data streams
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f = open(fname + ":stream_y", "w")
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f.write("yyyyyyyyyyyyyyyy\n" * 32768)
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f.close()
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f = open(fname + ":stream_z", "w")
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f.write("zzzzzzzzzzzzzzzz\n" * 32768)
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f.close()
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win32file.EncryptFile(fname)
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## backup raw data of encrypted file
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bkup_fname = win32api.GetTempFileName(dst_dir, "bef")[0]
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print("backup file:", bkup_fname)
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f = open(bkup_fname, "wb")
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ctxt = win32file.OpenEncryptedFileRaw(fname, 0)
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try:
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win32file.ReadEncryptedFileRaw(ReadCallback, (fname, bkup_fname, f), ctxt)
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finally:
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## if context is not closed, file remains locked even if calling process is killed
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win32file.CloseEncryptedFileRaw(ctxt)
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f.close()
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## restore data from backup to new encrypted file
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dst_fname = win32api.GetTempFileName(dst_dir, "wef")[0]
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print("restored file:", dst_fname)
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f = open(bkup_fname, "rb")
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ctxtout = win32file.OpenEncryptedFileRaw(dst_fname, win32file.CREATE_FOR_IMPORT)
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try:
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win32file.WriteEncryptedFileRaw(WriteCallback, (bkup_fname, dst_fname, f), ctxtout)
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finally:
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win32file.CloseEncryptedFileRaw(ctxtout)
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f.close()
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