using System.Text.Json;

namespace IdentityShroud.Core;

public interface IJwtSignatureProvider : IDisposable
{
    /*
        Of the signature and MAC algorithms specified in JSON Web Algorithms
        [JWA], only HMAC SHA-256 ("HS256") and "none" MUST be implemented by
        conforming JWT implementations.  It is RECOMMENDED that
        implementations also support RSASSA-PKCS1-v1_5 with the SHA-256 hash
        algorithm ("RS256") and ECDSA using the P-256 curve and the SHA-256
        hash algorithm ("ES256").  Support for other algorithms and key sizes
        is OPTIONAL.
     */

    void WriteJwtHeaderFields(Utf8JsonWriter writer);
    /// <summary>
    /// Length of the binary signature in bytes. 
    /// </summary>
    /// <returns></returns>
    int GetSignatureLength();

    void CalculateSignature(ReadOnlySpan<byte> jwt, Span<byte> signatureOut);
    
}