为什么ECIES私钥加密 公钥解密就出错,但是公钥加密,私钥解密就正常

Question

//公钥加密 私钥解密 //初始化秘钥 try {     KeyPairGenerator kp=KeyPairGenerator.getInstance("EC","BC");     kp.initialize(256,new SecureRandom());     KeyPair keyPair=kp.generateKeyPair();     ECPublicKey ecPubKey=(ECPublicKey)keyPair.getPublic();     ECPrivateKey ecPriKey=(ECPrivateKey)keyPair.getPrivate();     System.out.println("公钥:"+ Base64.encodeBase64String(ecPubKey.getEncoded()));     System.out.println("私钥:"+ Base64.encodeBase64String(ecPriKey.getEncoded()));     //私钥加密,公钥解密:加密     PKCS8EncodedKeySpec peks=new PKCS8EncodedKeySpec(ecPriKey.getEncoded());     KeyFactory keyFactory=KeyFactory.getInstance("EC");     PrivateKey priKey=keyFactory.generatePrivate(peks);     Cipher cipher=Cipher.getInstance("ECIES","BC");     cipher.init(Cipher.ENCRYPT_MODE,priKey);     byte[] result=cipher.doFinal("hello".getBytes());     System.out.println("私钥加密,公钥解密:加密-----"+Base64.encodeBase64String(result));     //私钥加密,公钥解密:解密     X509EncodedKeySpec x509=new X509EncodedKeySpec(ecPubKey.getEncoded());     keyFactory=KeyFactory.getInstance("EC");     PublicKey pubKey=keyFactory.generatePublic(x509);     cipher=Cipher.getInstance("ECIES","BC");     cipher.init(Cipher.DECRYPT_MODE,pubKey);     result=cipher.doFinal(result);     System.out.println("私钥加密,公钥解密:解密"+new String(result)); } catch (NoSuchAlgorithmException e) {     e.printStackTrace(); } catch (NoSuchProviderException e) {     e.printStackTrace(); } catch (InvalidKeySpecException e) {     e.printStackTrace(); } catch (NoSuchPaddingException e) {     e.printStackTrace(); } catch (InvalidKeyException e) {     e.printStackTrace(); } catch (BadPaddingException e) {     e.printStackTrace(); } catch (IllegalBlockSizeException e) {     e.printStackTrace(); } 异常信息  java.security.InvalidKeyException: must be passed recipient's public EC key for encryption at org.bouncycastle.jcajce.provider.asymmetric.ec.IESCipher.engineInit(Unknown Source) at org.bouncycastle.jcajce.provider.asymmetric.ec.IESCipher.engineInit(Unknown Source) at java.base/javax.crypto.Cipher.init(Cipher.java:1283) at java.base/javax.crypto.Cipher.init(Cipher.java:1223)