Dear Matt, On Mon, Apr 18, 2016 at 6:00 PM, Matt Caswell <matt at openssl.org> wrote: > > > On 18/04/16 15:55, Dmitry Belyavsky wrote: > > Hello, > > > > Could anybody explain how to deal with the output length in the > > EVP_EncryptUpdate? > > > > The function EVP_EncryptUpdate has the outl output parameter, which is > > designed for returning the length of the resulting ciphertext. Then > > internally it calls the do_cipher callback which does not take such a > > parameter. > > > > Is there a way to return an expected buffer length from the callback? > > It may be necessary when we call the EVP_EncryptUpdate some times, and > > we get the case when ctx->buf from the previous calls has enough bytes > > to be processed together with the input buffer so the output is longer > > then the input. > > The man page advises that the size of the output buffer should be: > > inl + cipher_block_size - 1 > > This should cater for all eventualities. > Thank you! -- SY, Dmitry Belyavsky -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mta.openssl.org/pipermail/openssl-users/attachments/20160418/0566cb2d/attachment.html>
