<div><div dir="auto">Yeah, Ingela, thanks! About default value and dh, dhfile options I know. The main question - is the any reasons don’t generate DH prime in real-time?</div></div><div><br><div class="gmail_quote"><div dir="ltr">чт, 23 авг. 2018 г. в 20:12, Ingela Andin <<a href="mailto:ingela.andin@gmail.com">ingela.andin@gmail.com</a>>:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hi!<div><br></div><div>It is only the default value that is hard coded (a recommend value), you may configure your own parameters with dh or dhfile option. </div><div><br></div><div>Regards Ingela</div></div><br><div class="gmail_quote"></div><div class="gmail_quote"><div dir="ltr">Den tors 23 aug. 2018 kl 16:57 skrev Alexander Petrovsky <<a href="mailto:askjuise@gmail.com" target="_blank">askjuise@gmail.com</a>>:<br></div></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"></blockquote></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hello!<div><br></div><div>We have stumble upon default DH prime (2048 bits) in Erlang when we try to establish TLS session with cisco spa303 (VoIP hardphone) via TLS_DHE_RSA_WITH_AES_256_CBC_SHA (0x0039) cipher suite. Unfortunately, this hardphone can work only with 1024 bit DH prime.</div><div><br></div><div>I wonder, why Ingela hardcoded this DH prime - <a href="https://github.com/erlang/otp/commit/3458af579af6600870c5ada69b81085f47e9f52b" target="_blank">https://github.com/erlang/otp/commit/3458af579af6600870c5ada69b81085f47e9f52b</a></div><div><br></div><div>In my synthetical tests, new DH prime generation is fast enough (crypto:strong_rand_bytes(256)), about 17 us in 99 percentile in 1000000 iterations.</div><div><br></div><div>Why Ingela has hardcoded this DH prime and is any reason why I shouldn't generate DH prime in real-time?</div><div><div><br></div>-- <br><div dir="ltr" class="m_822854184577153557m_-8002316599735766552gmail_signature"><div dir="ltr"><div><div dir="ltr">Петровский Александр / Alexander Petrovsky,<br><br>Skype: askjuise<br><div>Phone: +7 931 9877991<div><br></div></div></div></div></div></div></div></div></blockquote></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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</blockquote></div></div>-- <br><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr">Петровский Александр / Alexander Petrovsky,<br><br>Skype: askjuise<br><div>Phone: +7 931 9877991<div><br></div></div></div></div></div></div>