Java RSA验证

偏执的太偏执、 2022-05-17 11:17 179阅读 0赞

1、新增两个类RSAUtil 和 BASE64Util

package com.shishike.susie.utility;
    
    import org.bouncycastle.jce.provider.BouncyCastleProvider;
    
    import javax.crypto.Cipher;
    import java.security.*;
    import java.security.interfaces.RSAPrivateKey;
    import java.security.interfaces.RSAPublicKey;
    import java.security.spec.PKCS8EncodedKeySpec;
    import java.security.spec.X509EncodedKeySpec;
    import java.util.HashMap;
    import java.util.Map;
    
    
    /**
     * RSA加密解密
     * 此工具类能使用指定的字符串，每次生成相同的公钥和私钥且在linux和windows密钥也相同；相同的原文和密钥生成的密文相同
     */
    public class RSAUtil {
        private static final String ALGORITHM_RSA = "RSA";
        private static final String ALGORITHM_SHA1PRNG = "SHA1PRNG";
        private static final int KEY_SIZE = 1024;
        private static final String PUBLIC_KEY = "RSAPublicKey";
        private static final String PRIVATE_KEY = "RSAPrivateKey";
        private static final String TRANSFORMATION = "RSA/None/NoPadding";
    
        /**
         * 解密
         * 用私钥解密，解密字符串，返回字符串
         * @param data
         * @param key
         * @return
         * @throws Exception
         */
        public static String decryptByPrivateKey(String data, String key) throws Exception {
            return new String(decryptByPrivateKey(BASE64Util.decodeToByte(data), key));
        }
    
        /**
         * 加密
         * 用公钥加密，加密字符串，返回用base64加密后的字符串
         * @param data
         * @param key
         * @return
         * @throws Exception
         */
        public static String encryptByPublicKey(String data, String key) throws Exception {
            return encryptByBytePublicKey(data.getBytes(), key);
        }
        /**
         * 加密
         * 用公钥加密，加密byte数组，返回用base64加密后的字符串
         * @param data
         * @param key
         * @return
         * @throws Exception
         */
        public static String encryptByBytePublicKey(byte[] data, String key) throws Exception {
            return BASE64Util.encodeByte(encryptByPublicKey(data, key));
        }
    
        /**
         * 解密
         * 用私钥解密
         * @param data
         * @param key
         * @return
         * @throws Exception
         */
        public static byte[] decryptByPrivateKey(byte[] data, String key) throws Exception {
            byte[] keyBytes = BASE64Util.decodeToByte(key);//对私钥解密
            /*取得私钥*/
            PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
            KeyFactory keyFactory = KeyFactory.getInstance(ALGORITHM_RSA);
            Key privateKey = keyFactory.generatePrivate(pkcs8KeySpec);
            /*对数据解密*/
            Cipher cipher = Cipher.getInstance(TRANSFORMATION, new BouncyCastleProvider());//相同的原文、公钥能生成相同的密文。如果使用Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());//相同的原文、公钥生成的密文不同
            cipher.init(Cipher.DECRYPT_MODE, privateKey);
    
            return cipher.doFinal(data);
        }
    
        /**
         * 加密
         * 用公钥加密
         * @param data
         * @param key
         * @return
         * @throws Exception
         */
        public static byte[] encryptByPublicKey(byte[] data, String key) throws Exception {
            byte[] keyBytes = BASE64Util.decodeToByte(key);//对公钥解密
            /*取得公钥*/
            X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
            KeyFactory keyFactory = KeyFactory.getInstance(ALGORITHM_RSA);
            Key publicKey = keyFactory.generatePublic(x509KeySpec);
            /*对数据加密*/
            Cipher cipher = Cipher.getInstance(TRANSFORMATION, new BouncyCastleProvider());//相同的原文、公钥能生成相同的密文。如果使用Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());//相同的原文、公钥生成的密文不同
            cipher.init(Cipher.ENCRYPT_MODE, publicKey);
    
            return cipher.doFinal(data);
        }
    
        /**
         * 取得私钥
         * @param keyMap
         * @return
         */
        public static String getPrivateKey(Map<String, Object> keyMap) {
            Key key = (Key) keyMap.get(PRIVATE_KEY);
            return BASE64Util.encodeByte(key.getEncoded());
        }
    
        /**
         * 取得公钥
         * @param keyMap
         * @return
         */
        public static String getPublicKey(Map<String, Object> keyMap) {
            Key key = (Key) keyMap.get(PUBLIC_KEY);
            return BASE64Util.encodeByte(key.getEncoded());
        }
    
        /**
         * 初始化公钥和私钥
         * @param seed
         * @return
         * @throws Exception
         */
        public static Map<String, Object> initKey(String seed) throws Exception {
            KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(ALGORITHM_RSA);
            SecureRandom random = SecureRandom.getInstance(ALGORITHM_SHA1PRNG);//如果使用SecureRandom random = new SecureRandom();//windows和linux默认不同，导致两个平台生成的公钥和私钥不同
            random.setSeed(seed.getBytes());//使用种子则生成相同的公钥和私钥
            keyPairGen.initialize(KEY_SIZE, random);
            KeyPair keyPair = keyPairGen.generateKeyPair();
    
            RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();//公钥
            RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();//私钥
    
            Map<String, Object> keyMap = new HashMap<String, Object>(2);
    
            keyMap.put(PUBLIC_KEY, publicKey);
            keyMap.put(PRIVATE_KEY, privateKey);
            return keyMap;
        }
    
    
    }

package com.shishike.susie.utility;
    import org.apache.commons.codec.binary.Base64;
    
    public class BASE64Util {
        /**
         * 加密
         * 字符串加密为字符串
         * @param source
         * @return
         */
        public static String encode(String source) {
            return encodeByte(source.getBytes());
        }
    
        /**
         * 解密
         * 字符串解密为字符串
         * @param source
         * @return
         */
        public static String decode(String source) {
            return new String(decodeToByte(source));
        }
    
        /**
         * 加密
         * 加密byte[]类型，密文为字符串
         * @param b
         * @return
         */
        public static String encodeByte(byte[] b) {
            return new String(new Base64().encode(b));
        }
    
        /**
         * 解密
         * 将字符串解密为byte[]类型
         * @param source
         * @return
         */
        public static byte[] decodeToByte(String source) {
            return new Base64().decode(source.getBytes());
        }
    
    
    }

需要添加的依赖有

<dependency>
                <groupId>commons-codec</groupId>
                <artifactId>commons-codec</artifactId>
                <version>1.9</version>
            </dependency>
    
            <dependency>
                <groupId>org.bouncycastle</groupId>
                <artifactId>bcprov-jdk15on</artifactId>
                <version>1.55</version>
                
            </dependency>

测试方法为

public void testrsa(HttpServletRequest request, HttpServletResponse response) throws Exception {
    
    
            RSAUtil rsaUtil = new RSAUtil();
    
            String source = "12dfefDKLJKLKL464d中文f465as43f1a3 f46e353D1F34&*^$E65F46EF43456abcd54as56f00ef";//原文
            String seed = "zsq";//种子
    
            System.out.println("原文：\n" + source);
            Map<String, Object> keyMap = rsaUtil.initKey(seed);//初始化密钥
            String publicKey = rsaUtil.getPublicKey(keyMap);//公钥
            String privateKey = rsaUtil.getPrivateKey(keyMap);//私钥
            System.out.println("公钥：\n" + publicKey);
            System.out.println("私钥：\n" + privateKey);
            String encodedStr = rsaUtil.encryptByPublicKey(source, publicKey);//加密
            System.out.println("密文：\n" + encodedStr);
            String decodedStr = rsaUtil.decryptByPrivateKey(encodedStr, privateKey);//解密
            System.out.println("解密后的结果：\n" + decodedStr);
    
        }