使用RSA对数据进行加解密及验签操作

最近工作中遇到rsa加密操作，公私钥知识自行脑补，废话不多说，直接上代码

            //发送方
            String data ="asda";//需加签/加密的数据
            System.out.println("源数据:"+data);
            // 生成私钥
            KeyPairGenerator kpGen = KeyPairGenerator.getInstance("RSA");
            kpGen.initialize(512);
            KeyPair keyPair = kpGen.generateKeyPair();
            PublicKey publicKey = keyPair.getPublic();
            PrivateKey privateKey =keyPair.getPrivate();
            //加签
            Signature signature = Signature.getInstance("SHA1WithRSA");
            signature.initSign(privateKey);
            signature.update(data.getBytes("UTF8"));
            String sigData = Base64.getEncoder().encodeToString(signature.sign());
            System.out.println("加签后："+sigData);
            //加密
            // 创建密码器
            Cipher cipher1 = Cipher.getInstance("RSA");// 创建密码器
            cipher1.init(Cipher.ENCRYPT_MODE, privateKey);
            byte[] result1 = cipher1.doFinal(data.getBytes("UTF8"));
            String encodedData = Base64.getEncoder().encodeToString(result1);
            System.out.println("加密结果:"+encodedData);

            //接收方
            //验签
            X509EncodedKeySpec keySpec = new X509EncodedKeySpec(publicKey.getEncoded());
            KeyFactory keyFactory = KeyFactory.getInstance("RSA");
            Signature signature2 = Signature.getInstance("SHA1WithRSA");
            signature2.initVerify(keyFactory.generatePublic(keySpec));
            signature2.update(data.getBytes("UTF8"));
            System.out.println("验签结果："+signature2.verify(Base64.getDecoder().decode(sigData)));
            //解密
            // 创建密码器
            Cipher cipher = Cipher.getInstance("RSA");
            cipher.init(Cipher.DECRYPT_MODE, keyFactory.generatePublic(keySpec));
            byte[] result = cipher.doFinal(Base64.getDecoder().decode(encodedData));
            System.out.println( "解密结果:"+new String(result,"UTF8"));