Hi,
I have played around with the BIO filter functions and created a program
that basically compresses, encrypts and base64 encodes incoming
cleartext and writes the result to a file
(input->zlib->cipher->base64->file). This works well in the normal case,
but if my program is killed, I loose all data since nothing is written
to file until BIO_flush() is called. If I try to call BIO_flush(zlib) at
regular intervals, the next following BIO_write fails.
The man page for BIO_flush() is not very clear, "normally writes out any
internally buffered data, in some cases it is used to signal EOF and
that no more data will be written". I assume it's the "some cases" I
have come across or is there someway to flush the encrypted data to file
at an interval, so that some data can be salvaged? If there is, can it
be decrypted?
As a workaround I've started looking at using a memory buffer as a sink
and writing the resulting encrypted buffer to a file if I can't get the
above version to work better. The problem is that this will probably be
slower and that the decryption gets a little more complicated.
Thank you,
Jonas
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