引用maven包

   <dependency><groupId>org.bouncycastle</groupId><artifactId>bcprov-jdk18on</artifactId><version>1.72</version></dependency>

2.对报文进行加密后生成签名

      {// oristr报文 SECRET_KEY加密密钥String encryptedContent=AesUtil.encryptMsgStr(oristr, SECRET_KEY);//生成公钥和私钥// 生成SM2密钥对KeyPairGenerator keyGen = KeyPairGenerator.getInstance("EC", "BC");keyGen.initialize(256);  KeyPair keyPair = keyGen.generateKeyPair();  PrivateKey privateKey = keyPair.getPrivate();  PublicKey publicKey = keyPair.getPublic();//RSA转16进制后的私钥String privateKeyHex = CodecUtil.encodeBase64(privateKey.getEncoded());String publicKeyGex=CodecUtil