java版：ECC加密解密

maven中包含 org.bouncycastle和commons-codec

package test9;
import java.math.BigInteger;
import java.security.Key;
import java.security.KeyFactory;
import java.security.Security;
import java.security.interfaces.ECPrivateKey;
import java.security.interfaces.ECPublicKey;
import java.security.spec.ECFieldF2m;
import java.security.spec.ECParameterSpec;
import java.security.spec.ECPoint;
import java.security.spec.ECPrivateKeySpec;
import java.security.spec.ECPublicKeySpec;
import java.security.spec.EllipticCurve;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.HashMap;
import java.util.Map;

import javax.crypto.Cipher;
import javax.crypto.NullCipher;

import org.apache.commons.codec.binary.base64;
import org.bouncycastle.jce.provider.BouncyCastleProvider;

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2019-09-19 22:23  .idea\
     文件         622  2019-09-19 22:11  .idea\compiler.xml
     目录           0  2019-09-19 22:23  .idea\inspectionProfiles\
     目录           0  2019-09-19 22:15  .idea\libraries\
     文件         543  2019-09-19 22:15  .idea\libraries\Maven__commons_codec_commons_codec_1_13.xml
     文件         548  2019-09-19 22:11  .idea\libraries\Maven__org_bouncycastle_bcmail_jdk14_1_63.xml
     文件         548  2019-09-19 22:11  .idea\libraries\Maven__org_bouncycastle_bcpkix_jdk14_1_63.xml
     文件         548  2019-09-19 22:11  .idea\libraries\Maven__org_bouncycastle_bcprov_jdk14_1_63.xml
     文件         396  2019-09-19 22:10  .idea\misc.xml
     文件         262  2019-09-19 21:57  .idea\modules.xml
     文件        1300  2019-09-19 22:15  .idea\test9.iml
     文件        8792  2019-09-19 21:59  .idea\uiDesigner.xml
     文件       24892  2019-09-19 22:23  .idea\workspace.xml
     文件         998  2019-09-19 22:15  pom.xml
     目录           0  2019-09-19 22:09  src\
     目录           0  2019-09-19 22:09  src\main\
     目录           0  2019-09-19 22:23  src\main\java\
     目录           0  2019-09-19 22:23  src\main\resources\
     目录           0  2019-09-19 22:09  src\test\
     目录           0  2019-09-19 22:13  src\test\java\
     目录           0  2019-09-19 22:14  src\test\java\test9\
     文件        6033  2019-09-18 18:47  src\test\java\test9\ECCCoder.java
     文件         941  2019-09-19 22:14  src\test\java\test9\ECCCoderTest.java
     文件        3642  2019-09-19 22:14  src\test\java\test9\ECCUtil.java
     文件        2000  2019-09-18 17:47  src\test\java\test9\ECDSA.java
     文件         369  2019-09-18 18:50  src\test\java\test9\UtilHelper.java
     目录           0  2019-09-19 22:16  target\
     目录           0  2019-09-19 22:16  target\generated-test-sources\
     目录           0  2019-09-19 22:23  target\generated-test-sources\test-annotations\
     目录           0  2019-09-19 22:16  target\test-classes\
     目录           0  2019-09-19 22:16  target\test-classes\test9\
............此处省略5个文件信息