Springboot如何整合JwtHelper实现非对称加密

一、生成公私钥对

提供两种方法，一种基于命令行中的keytool工具生成，一种是基于springsecurity中的keypairgenerator类生成，现实现第二种方式：

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//    加密算法
    private static final String KEY_ALGORITHM = "RSA";
//    公钥key
    private static final String PUB_KEY="publicKey";
//    私钥key
    private static final String PRI_KEY="privateKey";
 
    public static Map<String,String> generateKey() throws NoSuchAlgorithmException {
        Map<String,String> keyMap=new HashMap<>();
        KeyPairGenerator instance = KeyPairGenerator.getInstance(KEY_ALGORITHM);
        KeyPair keyPair = instance.generateKeyPair();
        PrivateKey privateKey = keyPair.getPrivate();
        PublicKey publicKey = keyPair.getPublic();
        //Base64 编码
        byte[] privateKeyEncoded = privateKey.getEncoded();
        String privateKeyStr = Base64.encodeBase64String(privateKeyEncoded);
        byte[] publicKeyEncoded = publicKey.getEncoded();
        String publicKeyStr=Base64.encodeBase64String(publicKeyEncoded);
        keyMap.put(PUB_KEY,publicKeyStr);
        keyMap.put(PRI_KEY,privateKeyStr);
        return keyMap;
    }

二、利用私钥生产token

 //    加密算法
    private static final String KEY_ALGORITHM = "RSA";
    //    公钥key
    private static final String PUB_KEY="publicKey";
    //    私钥key
    private static final String PRI_KEY="privateKey";
//    GenerateKey Key=new GenerateKey();
//    利用私钥生产token
    public static Map<String,String> generateToken(UserDetails userDetails) throws NoSuchAlgorithmException, InvalidKeySpecException {
        GenerateKey Key=new GenerateKey();
        RSAPrivateKey privateKey = null;
        RSAPublicKey publicKey=null;
        String token=null;
        Map<String, String> map=new HashMap<>();
        Map<String, String> keyMap = Key.generateKey();
        privateKey=getPrivateKey(keyMap.get(PRI_KEY));
        Map<String,String> tokenMap=new HashMap<>();
        tokenMap.put("userName",userDetails.getUsername());
//        使用私钥加密
        token = JwtHelper.encode(JSON.toJSONString(tokenMap), new RsaSigner(privateKey)).getEncoded();
 
 
        map.put("token",token);
        map.put("publicKey",keyMap.get(PUB_KEY));
        return map;
    }

三、利用公钥解密token

public static String parseToken(String token,String publicKey) throws NoSuchAlgorithmException, InvalidKeySpecException {
        Jwt jwt=null;
        RSAPublicKey rsaPublicKey;
        rsaPublicKey=getPublicKey(publicKey);
        jwt=JwtHelper.decodeAndVerify(token, new RsaVerifier(rsaPublicKey) );
        String claims= jwt.getClaims();
        return claims;
    }

四、将String类型的公钥转换成RSAPublicKey对象

    /**
     * 得到公钥
     *
     * @param publicKey
     *            密钥字符串（经过base64编码）
     * @throws Exception
     */
    public static RSAPublicKey getPublicKey(String publicKey) throws NoSuchAlgorithmException, InvalidKeySpecException {
        // 通过X509编码的Key指令获得公钥对象
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
        X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(Base64.decodeBase64(publicKey));
        RSAPublicKey key = (RSAPublicKey) keyFactory.generatePublic(x509KeySpec);
        return key;
    }

五、将String类型的私钥转换成RSAPrivateKey对象

    /**
     * 得到私钥pkcs8
     *
     * @param privateKey
     *            密钥字符串（经过base64编码）
     * @throws Exception
     */
    public static RSAPrivateKey getPrivateKey(String privateKey)
            throws NoSuchAlgorithmException, InvalidKeySpecException {
        // 通过PKCS#8编码的Key指令获得私钥对象
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
        PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(Base64.decodeBase64(privateKey));
        RSAPrivateKey key = (RSAPrivateKey) keyFactory.generatePrivate(pkcs8KeySpec);
        return key;
    }