import org.spongycastle.jce.spec.ECPublicKeySpec; //导入依赖的package包/类
@Override
public boolean isSignatureValid(byte[] data, byte[] signature, Pubkey pubkey) {
    try {
        ECParameterSpec spec = new ECParameterSpec(
            EC_CURVE_PARAMETERS.getCurve(),
            EC_CURVE_PARAMETERS.getG(),
            EC_CURVE_PARAMETERS.getN(),
            EC_CURVE_PARAMETERS.getH(),
            EC_CURVE_PARAMETERS.getSeed()
        );

        ECPoint Q = keyToPoint(pubkey.getSigningKey());
        KeySpec keySpec = new ECPublicKeySpec(Q, spec);
        PublicKey publicKey = KeyFactory.getInstance(ALGORITHM_ECDSA, provider).generatePublic(keySpec);

        Signature sig = Signature.getInstance(ALGORITHM_ECDSA, provider);
        sig.initVerify(publicKey);
        sig.update(data);
        return sig.verify(signature);
    } catch (GeneralSecurityException e) {
        throw new ApplicationException(e);
    }
}
 

import org.spongycastle.jce.spec.ECPublicKeySpec; //导入依赖的package包/类
private PublicKey loadPublicKey(byte[] data) throws InvalidKeySpecException    {
    ECPublicKeySpec pubKey = new ECPublicKeySpec(params.getCurve().decodePoint(data), params);
    return kf.generatePublic(pubKey);
}