Help on Diffie Hellman key exchange

Tomas Mraz tmraz at
Tue Nov 12 08:14:32 UTC 2019

On Mon, 2019-11-04 at 17:34 -0500, Jason Qian via openssl-users wrote:
> Hi
>    We have an application that does the Diffie Hellman key exchange
> (OpenSSL/1.1.0f).
>    It works fine, but under heavy loaded conditions, sometimes an
> invalide secret been generated and other side couldn't decrypt the
> data (the secret seems offset by one).      
>    The client side is c++ and the server side is java.
>     DH_compute_key(secretKey, bnY, m_DH); 
>    Someone in the openssl group also talks about a similar issue, but
> not sure if have a solution. 

Could it be a padding issue? I.E. use DH_compute_key_padded() instead.

Tomáš Mráz
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                                              Turkish proverb
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