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65 lines
1.9 KiB
65 lines
1.9 KiB
6 years ago
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import win32file, win32api, winerror
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import os
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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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