如何从32字节的原始私钥中获取java.security.PrivateKey？(Secp256k1算法)

import java.math.BigInteger;
import java.security.KeyFactory;
import java.security.PrivateKey;
import java.security.spec.ECParameterSpec;
import java.security.spec.ECPrivateKeySpec;
import java.security.spec.ECNamedCurveSpec;
import org.bouncycastle.jce.ECNamedCurveTable;

public class PrivateKeyConverter {
    public static PrivateKey getPrivateKeyFromBytes(byte[] privateKeyBytes) throws Exception {
        BigInteger privateKeyValue = new BigInteger(1, privateKeyBytes);

        ECParameterSpec ecParameterSpec = ECNamedCurveTable.getParameterSpec("secp256k1");
        ECPrivateKeySpec privateKeySpec = new ECPrivateKeySpec(privateKeyValue, ecParameterSpec);

        KeyFactory keyFactory = KeyFactory.getInstance("EC");
        PrivateKey privateKey = keyFactory.generatePrivate(privateKeySpec);

        return privateKey;
    }
}