[openssl-users] EVP_EncryptUpdate and EVP_CIPHER callback do_cipher

Dmitry Belyavsky beldmit at gmail.com
Mon Apr 18 14:55:30 UTC 2016


Could anybody explain how to deal with the output length in the

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

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

Thank you!

SY, Dmitry Belyavsky
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