RSA前端加密后端解密避免出现明文密码

话不多说,直接开撸

public class RSAUtils {
    private static String PUB_KEY = "xxxxxx";
    private static String PRIV_KEY ="xxxxxx";
    public static Map<Integer, String> genKeyPair() {
        Map<Integer, String> keyMap = new HashMap<Integer, String>(); // 用于封装随机产生的公钥与私钥
        try {
            // KeyPairGenerator类用于生成公钥和私钥对，基于RSA算法生成对象
            KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA");
 
            // 初始化密钥对生成器，密钥大小为96-1024位
            keyPairGen.initialize(1024, new SecureRandom());
 
            // 生成一个密钥对，保存在keyPair中
            KeyPair keyPair = keyPairGen.generateKeyPair();
            RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate(); // 得到私钥
            RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic(); // 得到公钥
 
            // 得到公钥字符串
            String publicKeyString = new String(Base64.encodeBase64(publicKey.getEncoded()));
            // 得到私钥字符串
            String privateKeyString = new String(Base64.encodeBase64((privateKey.getEncoded())));
            // 将公钥和私钥保存到Map
            keyMap.put(0, publicKeyString); // 0表示公钥
            keyMap.put(1, privateKeyString); // 1表示私钥
        } catch (Exception e) {
            return null;
        }
 
        return keyMap;
    }
 
    /**
     * RSA公钥加密
     * 
     * @param str
     *            需要加密的字符串
     * @param publicKey
     *            公钥
     * @return 公钥加密后的内容
     */
    public static String encrypt(String str) {
        String outStr = null;
        try {
            // base64编码的公钥
            byte[] decoded = Base64.decodeBase64(PUB_KEY);
            RSAPublicKey pubKey = (RSAPublicKey) KeyFactory.getInstance("RSA")
                    .generatePublic(new X509EncodedKeySpec(decoded));
            // RSA加密
            Cipher cipher = Cipher.getInstance("RSA");
            cipher.init(Cipher.ENCRYPT_MODE, pubKey);
            outStr = Base64.encodeBase64String(cipher.doFinal(str.getBytes("UTF-8")));
        } catch (Exception e) {
        }
        return outStr;
    }
 
    /**
     * RSA私钥解密
     * 
     * @param str
     *            加密字符串
     * @param privateKey
     *            私钥
     * @return 私钥解密后的内容
     */
    public static String decrypt(String str) {
        String outStr = null;
        try {
            // 64位解码加密后的字符串
            byte[] inputByte = Base64.decodeBase64(str.getBytes("UTF-8"));
            // base64编码的私钥
            byte[] decoded = Base64.decodeBase64(PRIV_KEY);
            RSAPrivateKey priKey = (RSAPrivateKey) KeyFactory.getInstance("RSA")
                    .generatePrivate(new PKCS8EncodedKeySpec(decoded));
            // RSA解密
            Cipher cipher = Cipher.getInstance("RSA");
            cipher.init(Cipher.DECRYPT_MODE, priKey);
            outStr = new String(cipher.doFinal(inputByte));
        } catch (Exception e) {
        }
        return outStr;
    }
 
}