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The following code was working fine on Android 7

    KeyPairGenerator kg = KeyPairGenerator.getInstance("EC","BC");
    kg.initialize(spec);
    KeyPair kp = kg.generateKeyPair();
    mKeyEx = KeyAgreement.getInstance("ECDH");
    mKeyEx.init(kp.getPrivate());
    mPubKeyX509 = kp.getPublic().getEncoded();
    mPubKey = new byte[(spec.getCurve().getField().getFieldSize() + 7) / 8 * 2 + 1];
    System.arraycopy(mPubKeyX509, mPubKeyX509.length - mPubKey.length, mPubKey, 0, mPubKey.length);
As you know bouncy castle has been deprecated on Android 9,so i changed first line to: 
 KeyPairGenerator kg = KeyPairGenerator.getInstance("EC");
I get the following message error  :
java.lang.RuntimeException: error:0f00007b:elliptic curve routines:OPENSSL_internal:UNKNOWN_GROUP
On the following line
mPubKeyX509 = kp.getPublic().getEncoded();
Any help please ?
                This depends on what spec is, so you need to include it in your code. Java providers have the annoying problem with not being fail fast, i.e. often keys are "constructed" and then only if you perform an operation then you'll find out they're not valid.
– Maarten Bodewes
                May 2, 2020 at 23:00
                i can share spec with you if you don't mind, the problem is that my spec are working fine in android 7. Thank you for your help
– Singa
                May 3, 2020 at 0:45
        
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