using System.Security.Cryptography;

namespace GeoVLog.Core.Crypto;

internal static class SignatureHelper
{
    private static RSA _signer;
    private static RSA _verifier;

    static SignatureHelper()
    {
        _signer = RSA.Create();
        _signer.ImportFromPem(CompanyKeys.SigningPrivatePem);

        _verifier = RSA.Create();
        _verifier.ImportFromPem(CompanyKeys.SigningPublicPem);
    }

    internal static byte[] SignSha256(ReadOnlySpan<byte> data)
        => _signer.SignData(data, HashAlgorithmName.SHA256, RSASignaturePadding.Pss);

    internal static bool VerifySha256(ReadOnlySpan<byte> data, ReadOnlySpan<byte> sig)
        => _verifier.VerifyData(data, sig, HashAlgorithmName.SHA256, RSASignaturePadding.Pss);
}