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macOS: RSA.Create and Import fails with > 8192-bit keys #110588

@vcsjones

Description

@vcsjones

In macOS, this will fail:

RSA rsa = RSA.Create(16_384);
rsa.ExportParameters(true);

Likewise, importing a 16K key does not work.

See big test
using System.Security.Cryptography;

void Main()
{
 	RSA rsa = RSA.Create();
	rsa.ImportPkcs8PrivateKey(Convert.FromBase64String("""
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}

I don't think it really matters one way or the other if 16K keys work (they are obscenely large) however, the MaxKeySize is 16_384

new KeySizes(minSize: 1024, maxSize: 16384, skipSize: 8),

Since I don't see a way to get a 16K key to work with Apple platforms, we should probably just lower this to 8192, which does appear to work, as recently as macOS 15.1.1.

We have a test for 16K keys that fails, but it is guarded by "IsStressModeEnabled".

[ConditionalFact(typeof(TestEnvironment), nameof(TestEnvironment.IsStressModeEnabled))]
public static void GenerateMaxKey()
{
GenerateKey(rsa => GetMax(rsa.LegalKeySizes));
}

It fails when I do DOTNET_TEST_STRESS=true ./dotnet.sh test src/libraries/System.Security.Cryptography/tests --filter GenerateMaxKey, so I guess we never run with this enabled on macOS.

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