DigitalData.Core/DigitalData.Core.Security/Cryptographer/RSADecryptor.cs

using DigitalData.Core.Abstractions.Security;
using DigitalData.Core.Security.Config;
using DigitalData.Core.Security.Extensions;
using System.Security.Cryptography;

namespace DigitalData.Core.Security.Cryptographer
{
    public class RSADecryptor : RSACryptographer, IRSADecryptor, IRSACryptographer
    {
        public bool Encrypt { get; init; }

        private readonly Lazy<IRSAEncryptor> _lazyEncryptor;

        public IRSAEncryptor Encryptor => _lazyEncryptor.Value;

        public RSADecryptor()
        {
            _lazyEncryptor = new(() => new RSAEncryptor()
            {
                Pem = RSA.ExportRSAPublicKeyPem(),
                Padding = Padding
            });
        }

        public byte[] Decrypt(byte[] data) => RSA.Decrypt(data, Padding);

        public string Decrypt(string data) => RSA.Decrypt(data.Base64ToByte(), Padding).BytesToString();

        public override void Init()
        {
            base.Init();
            if (Encrypt)
                RSA.ImportFromEncryptedPem(Pem, Secrets.PBE_PASSWORD.AsSpan());
            else
                RSA.ImportFromPem(Pem);
        }

        public override void FileNotFoundEvent()
        {
            var new_decryptor = new RSADecryptor()
            {
                Pem = RSAFactory<RSAFactoryParams>.Static.CreateRSAPrivateKeyPem(),
                Encrypt = Encrypt
            };

            _pem = new_decryptor.Pem;

            if (PemPath is not null)
                Task.Run(async () =>
                {
                    await File.WriteAllTextAsync(_pem, PemPath);
                });
        }
    }
}