<PackageReference Include="BouncyCastle.Cryptography" Version="2.4.0" />

Org.BouncyCastle.Pkcs.PrivateKeyInfoFactory

public static class PrivateKeyInfoFactory
namespace Org.BouncyCastle.Pkcs { public static class PrivateKeyInfoFactory { public static PrivateKeyInfo CreatePrivateKeyInfo(AsymmetricKeyParameter privateKey); public static PrivateKeyInfo CreatePrivateKeyInfo(AsymmetricKeyParameter privateKey, Asn1Set attributes); public static PrivateKeyInfo CreatePrivateKeyInfo(char[] passPhrase, EncryptedPrivateKeyInfo encInfo); public static PrivateKeyInfo CreatePrivateKeyInfo(char[] passPhrase, bool wrongPkcs12Zero, EncryptedPrivateKeyInfo encInfo); } }