我正在尝试实现基于椭圆曲线Diffie Hellman的密钥生成。现在我想自己指定我的椭圆曲线，所以我从这里获取参数。

我为实现这一点而编写的代码：

public void createKey(){

        // base point (generator???)
        BigInteger x = new BigInteger("2fe13c0537bbc11acaa07d793de4e6d5e5c94eee8", 16);
        BigInteger y = new BigInteger("289070fb05d38ff58321f2e800536d538ccdaa3d9", 16);

        // the order of generator
        BigInteger n = new BigInteger("5846006549323611672814741753598448348329118574063", 10);

        // curves coefficients
        BigInteger ab = new BigInteger("1", 2);

        // curves cofactor
        BigInteger h = new BigInteger("2", 10);

        // exponents of the equotation
        int[] ks = {7, 6, 3};

        ECFieldF2m ecField = new ECFieldF2m(163, ks);
        // Elliptic curve
        EllipticCurve ec = new EllipticCurve(ecField, ab, ab);

        // GENERATOR POINT
        ECPoint g = new ECPoint(x, y);

        // Parameter specs?
        ECParameterSpec ecps = new ECParameterSpec(ec , g , n, h.intValue());

    try {
        // get keypair
        KeyPairGenerator kg = KeyPairGenerator.getInstance("ECDSA");
        kg.initialize(ecps, new SecureRandom());
        KeyPair kp = kg.generateKeyPair();
        Log.d("SECLIENT"+type,kp.getPublic().toString());
        Log.d("SECLIENT"+type,kp.getPrivate().toString());
    }catch (Exception e){
        e.printStackTrace();
    }
}

此时，代码编译。然而，它在必须生成KeyPair的try_catch块中失败了。

错误消息是：

无法创建ECKeyFactory：未处理的字段类java.security. spec.ECFieldF2m

有人有这个问题吗？我怎么解决这个问题？