namespace CRD.Utils.DRM;

using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Crypto.Engines;
using Org.BouncyCastle.Crypto.Macs;
using Org.BouncyCastle.Crypto.Parameters;
using System.Security.Cryptography;

public class CryptoUtils{
    public static byte[] GetHMACSHA256Digest(byte[] data, byte[] key){
        return new HMACSHA256(key).ComputeHash(data);
    }

    public static byte[] GetCMACDigest(byte[] data, byte[] key){
        IBlockCipher cipher = new AesEngine();
        IMac mac = new CMac(cipher, 128);

        KeyParameter keyParam = new KeyParameter(key);

        mac.Init(keyParam);

        mac.BlockUpdate(data, 0, data.Length);

        byte[] outBytes = new byte[16];

        mac.DoFinal(outBytes, 0);
        return outBytes;
    }
}