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tls-uses-pqc: support running against OpenSSL 4. #422

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Merged
tmds merged 2 commits into from
Jul 6, 2026
Merged

tls-uses-pqc: support running against OpenSSL 4. #422

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tls-uses-pqc: support running against OpenSSL 4.
tmds Jul 1, 2026
22f657a
Throw if we don't know how to map libssl.
tmds Jul 6, 2026
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22 changes: 21 additions & 1 deletion tls-uses-pqc/Program.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,8 @@
using System.Security.Cryptography;
using System.Security.Cryptography.X509Certificates;

SetOpenSSLImportResolver();

// Create a self-signed certificate.
using var key = ECDsa.Create();
var certReq = new CertificateRequest("CN=localhost", key, HashAlgorithmName.SHA256);
Expand Down Expand Up @@ -55,6 +57,24 @@
return 1;

// Use OpenSSL interop to get the negotiated key exchange group (SslStream doesn't expose this information).

@omajid omajid Jul 2, 2026

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Should this comment be moved now?

@tmds tmds Jul 2, 2026

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Everything below the comment is for the interop.

static void SetOpenSSLImportResolver()
{
// Use the latest OpenSSL version on the system.
NativeLibrary.SetDllImportResolver(Assembly.GetExecutingAssembly(), (name, assembly, searchPath) =>
{
if (name == "libssl")
{
if (NativeLibrary.TryLoad("libssl.so.4", assembly, searchPath, out var h) ||
NativeLibrary.TryLoad("libssl.so.3", assembly, searchPath, out h))
{
return h;
}
throw new NotSupportedException($"Cannot resolve {name}.");
}
return IntPtr.Zero; // Use the default resolution logic.
});
}

static string? GetNegotiatedGroupName(SslStream sslStream)
{
var secCtxField = typeof(SslStream).GetField("_securityContext", BindingFlags.NonPublic | BindingFlags.Instance)!;
Expand All @@ -72,5 +92,5 @@
}
}

[DllImport("libssl.so.3")]
[DllImport("libssl")]
static extern IntPtr SSL_get0_group_name(IntPtr ssl);
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