Performing ECIES operation using Bouncy castle with KeyPair in JKS

Question

I have requirement to perform ECIES encryt/decrypt using secp256r1 with BC as provider.

I have need reference of (1) how to store ECIES private-public key pair in JKS Keystore (2) retrieve public key from JKS.

I have provision key-pair using keytool command as per https://zombiesecured.com/html/tutorials/Keytool/ECC-JK.html.

• Signature algorithm name: SHA256withECDSA
• Subject Public Key Algorithm: 256-bit EC key

(2) Can you help how to retrieve key in ECDSAPublicKey format as input to encryption .

I have found reference of decoding key to ECPublicKey as below. What should be my 1st argument? How to retrieve encoded key from JKS?

public static ECPublicKey decodePublicKey(byte[] encoded, String namedCurve) throws InvalidKeySpecException, NoSuchAlgorithmException, NoSuchProviderException, IOException
       {
             KeyFactory fact = KeyFactory.getInstance("ECDSA", BouncyCastleProvider.PROVIDER_NAME);
             ECNamedCurveParameterSpec params = ECNamedCurveTable.getParameterSpec(namedCurve);
 
             java.security.spec.EllipticCurve ellipticCurve = EC5Util.convertCurve(params.getCurve(), params.getSeed());
             java.security.spec.ECPublicKeySpec keySpec = new java.security.spec.ECPublicKeySpec(ECPointUtil.decodePoint(ellipticCurve,encoded),EC5Util.convertSpec(ellipticCurve, params));
             return (ECPublicKey) fact.generatePublic(keySpec);
       }

3. how to use IESCipher, IESParameterSpec, engineInit to perform ECIES encrypt/decrypt.