Re: OpenSSL 3.0 different behaviour on smaller DH groups?

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Simon Chopin <simon.chopin@xxxxxxxxxxxxx> wrote:
    > This test suite fails several times with a failed call to
    > EVP_PKEY_derive_set_peer, without much more details:
    > https://github.com/net-ssh/net-ssh/blob/master/test/transport/kex/test_diffie_hellman_group14_sha1.rb

    > However, the *exact same* test suite works, with the only difference
    > being that the failing suite uses the DH group 14, which is 2048bits,
    > whereas the one that passes uses the group 1, which the Internet tells
    > me is 768bits.

DH groups of 768bits are considered too weak.
I wonder if openssl 3 is declining to do anymore, and/or has been compiled
with an option to drop support for that size.
(I have no knowledge of that part of openssl)


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