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我在使用带有 OaepSHA256（C#，.NET Framework 4.6.1）的 RSACng（512）时遇到问题 - 获取 System.Security.Cryptography.CryptographicException：“参数不正确。” 在编码（任何）字节数组时：

using System.Security.Cryptography;
...

using (RSACng rsaCng = new RSACng(512))
{
    var result = rsaCng.Encrypt(new byte[1], RSAEncryptionPadding.OaepSHA256); // throws ex
}

System.Security.Cryptography.CryptographicException: 'The parameter is incorrect.'
This exception was originally thrown at this call stack:
    System.Security.Cryptography.NCryptNative.EncryptData<T>(Microsoft.Win32.SafeHandles.SafeNCryptKeyHandle, byte[], ref T, System.Security.Cryptography.AsymmetricPaddingMode, System.Security.Cryptography.NCryptNative.NCryptEncryptor<T>)
    System.Security.Cryptography.NCryptNative.EncryptDataOaep(Microsoft.Win32.SafeHandles.SafeNCryptKeyHandle, byte[], string)
    System.Security.Cryptography.RSACng.Encrypt(byte[], System.Security.Cryptography.RSAEncryptionPadding)
    MiniJavaCertTest.Program.Test() in Program.cs
    MiniJavaCertTest.Program.Main() in Program.cs

如果我使用 1024 密钥大小，它可以工作：

using (RSACng rsaCng = new RSACng(1024))
{
    var result = rsaCng.Encrypt(new byte[1], RSAEncryptionPadding.OaepSHA256); // works ok
}

如果使用 512 密钥大小，它也可以工作，但使用 OaepSHA1 而不是 OaepSHA256：

using (RSACng rsaCng = new RSACng(512))
{
    var result = rsaCng.Encrypt(new byte[1], RSAEncryptionPadding.OaepSHA1); // works ok
}

知道为什么这不起作用以及如何使其适用于 512 + OaepSHA256？

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