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Description
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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"""), out _);
}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
runtime/src/libraries/Common/src/System/Security/Cryptography/RSASecurityTransforms.cs
Line 50 in f377332
| 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".
Lines 23 to 27 in cc66c77
| [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.