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Enable and prioritize post quantum EC groups #147

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Enable and prioritize post quantum EC groups #147

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57f9bab
feat: prioritize post quantum EC groups
leo9800 May 4, 2026
8dcbd1e
fix: avoid enabling MLKEM groups when run against legacy version of G…
leo9800 May 4, 2026
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24 changes: 24 additions & 0 deletions src/tlshd/ktls.c
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Original file line number Diff line number Diff line change
Expand Up @@ -478,6 +478,30 @@ static int tlshd_gnutls_priority_init_list(const unsigned int *ciphers,
if (!pstring)
return -ENOMEM;

/* Prioritize post-quantum EC groups. */
pstring = tlshd_string_concat(pstring, ":-GROUP-ALL");
if (!pstring)
return -ENOMEM;

if (gnutls_check_version_numeric(3, 8, 8)) {
pstring = tlshd_string_concat(pstring, ":+GROUP-X25519-MLKEM768:+GROUP-SECP256R1-MLKEM768");
if (!pstring)
return -ENOMEM;
}

if (gnutls_check_version_numeric(3, 8, 9)) {
pstring = tlshd_string_concat(pstring, ":+GROUP-SECP384R1-MLKEM1024");
if (!pstring)
return -ENOMEM;
}

pstring = tlshd_string_concat(pstring,
":+GROUP-X25519:+GROUP-X448:+GROUP-SECP256R1:+GROUP-SECP384R1:+GROUP-SECP521R1"
":+GROUP-FFDHE2048:+GROUP-FFDHE3072:+GROUP-FFDHE4096:+GROUP-FFDHE6144:+GROUP-FFDHE8192"
);
if (!pstring)
return -ENOMEM;

/*
* Handshakes must negotiate only ciphers that are supported
* by kTLS. The list below contains the ciphers that are
Expand Down