[Bug] AesGcm instance should not be reused in EncryptionCodec #50
Description
Describe the bug
AesGcm is not thread safe, so it is dangerous to share in the codec. See dotnet/runtime#71198 and other places.
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AesGcm is not thread safe, so it is dangerous to share in the codec. See dotnet/runtime#71198 and other places.