PaymentKeyProtector.cs

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using Microsoft.AspNetCore.DataProtection;
 
namespace ShopPlatform.Services;

public sealed class PaymentKeyProtector
{
    private readonly IDataProtector _protector;

    public PaymentKeyProtector(IDataProtectionProvider provider)
        => _protector = provider.CreateProtector("ShopPlatform.PaymentKeys");

    public string Protect(string plainText) => _protector.Protect(plainText);

    public string? Unprotect(string? cipherText)
    {
        if (string.IsNullOrEmpty(cipherText)) return null;
        try { return _protector.Unprotect(cipherText); }
        catch { return null; }
    }
}