<PackageReference Include="BouncyCastle.Cryptography" Version="2.6.1" />

Org.BouncyCastle.Pkcs.PrivateKeyInfoFactory

public static class PrivateKeyInfoFactory

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)