ldap-cesi/ldap-cesi/Services/RsaKeyService.cs

using System.Security.Cryptography;
using ldap_cesi.Services.Interfaces;

namespace ldap_cesi.Services;

public class RsaKeyService : IRsaKeyService
{
    private readonly RSA _rsa;
    private readonly string _keyPath;

    public RsaKeyService(IConfiguration configuration)
    {
        _rsa = RSA.Create();
        _keyPath = configuration["Jwt:KeyPath"] ?? "cle.bin";
        LoadOrCreateRsaKey();
    }

    private void LoadOrCreateRsaKey()
    {
        if (File.Exists(_keyPath))
        {
            var keyBytes = File.ReadAllBytes(_keyPath);
            _rsa.ImportRSAPrivateKey(keyBytes, out _);
        }
        else
        {
            var keyBytes = _rsa.ExportRSAPrivateKey();
            File.WriteAllBytes(_keyPath, keyBytes);
        }
    }

    public RSA GetRsaKey()
    {
        return _rsa;
    }
}