在这段代码基础上改成只支持"secp256r1", "secp384r1", "secp521r1”椭圆曲线

要将代码修改为仅支持"secp256r1", "secp384r1", "secp521r1"这些椭圆曲线，你需要对以下几个地方进行修改：

1. 在生成证书和私钥的代码段中，需要添加对椭圆曲线的限制条件。可以使用`ECNamedCurveTable.getParameterSpec()`方法来获取椭圆曲线参数规范，并将其传递给`KeyPairGenerator.initialize()`方法以限制生成的密钥对使用指定的椭圆曲线。

2. 在初始化`KeyManagerFactory`和`SSLContext`的代码段中，需要使用支持指定椭圆曲线的相应算法。可以使用`"EC"`作为参数来代替`"X509"`，并在`KeyManagerFactory.init()`方法和`SSLContext.getInstance()`方法中使用。

下面是修改后的代码示例：

try {
    String certPath = "/proc/gsboard/dev_info/security/certificate";
    byte[] certContent = File2byte(new File(certPath));
    String keyPath = "/proc/gsboard/dev_info/security/private_key";
    byte[] keyContent = File2byte(new File(keyPath));
    byte[] certBytes = parseDERFromPEM(certContent, "-----BEGIN CERTIFICATE-----", "-----END CERTIFICATE-----");
    byte[] keyBytes = parseDERFromPEM(keyContent, "-----BEGIN PRIVATE KEY-----", "-----END PRIVATE KEY-----");

    X509Certificate cert = generateCertificateFromDER(certBytes);
    PrivateKey key = generatePrivateKeyFromDER(keyBytes);

    // 限制椭圆曲线
    ECNamedCurveParameterSpec ecSpec = ECNamedCurveTable.getParameterSpec("secp256r1"); // 或者"secp384r1", "secp521r1"
    KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("EC", "BC");
    keyPairGen.initialize(ecSpec);

    KeyStore keystore = KeyStore.getInstance("BKS");
    keystore.load(null);
    keystore.setCertificateEntry("cert-alias", cert);
    keystore.setKeyEntry("key-alias", key, null, new Certificate[]{cert});

    KeyManagerFactory kmf = KeyManagerFactory.getInstance("EC", "BC"); // 使用EC算法
    kmf.init(keystore, null);

    KeyManager[] km = kmf.getKeyManagers();
    TrustManager[] trustAllCerts = new TrustManager[]{new X509TrustManager() {
        public X509Certificate[] getAcceptedIssuers() {
            return new X509Certificate[0];
        }

        @Override
        public void checkClientTrusted(X509Certificate[] certs, String authType) {
        }

        @Override
        public void checkServerTrusted(X509Certificate[] certs, String authType) {
        }
    }};
    SSLContext sslContext = SSLContext.getInstance("TLSV1.2");
    sslContext.init(km, trustAllCerts, null);
    return sslContext;
} catch (Exception e) {
    Log.i(TAG, "createSSLContext e : " + e);
    return null;
}

请注意，上述代码仅提供了修改的示例，你需要根据实际情况进行适当的调整和测试。