java fortify弱密码漏洞使用AES的GCM解决

java_fortify Scan：

问题：
  1.Weak Encryption
  2.Weak Encryption: Insecure Mode of Operation

问题解释：
  问题1.程序使用了弱加密算法，无法保证敏感数据的保密性。
  问题2.使用某加密方式的某不安全加密模式，例如：AES的ECB模式不安全
  注：本人使用了DES加密导致的问题1，使用了AES的ECB模式导致出现问题2

解决方案：
  使用某安全加密方式的某种安全加密模式，例如：AES的GCM模式

使用AES的GCM模式工具类（JDK1.8）：

package com.test.common.util;

import javax.crypto.*;
import javax.crypto.spec.GCMParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.security.*;
import java.util.Base64;


public class AesUtils {
    private static final String ALGORITHM = "AES";
    private static final String AES_GCM_PADDING = "AES/GCM/NoPadding";

    
    public static byte[] encodeByBase64(byte[] plainBytes) {
        if (plainBytes == null) {
            return null;
        }
        return Base64.getEncoder().encode(plainBytes);
    }

    
    public static byte[] decodeByBase64(byte[] cipherText) {
        if (cipherText == null) {
            return null;
        }
        return Base64.getDecoder().decode(cipherText);
    }

    
    public static byte[] encodeByGCM(Key key, byte[] data, boolean base64Flg) throws NoSuchPaddingException, NoSuchAlgorithmException, IllegalBlockSizeException, BadPaddingException, InvalidKeyException {
        Cipher cipher = Cipher.getInstance(AES_GCM_PADDING);
        cipher.init(Cipher.ENCRYPT_MODE, key);
        byte[] iv = cipher.getIV();
        assert iv.length == 12;
        byte[] encryptData = cipher.doFinal(data);
        assert encryptData.length == data.length + 16;
        byte[] message = new byte[12 + data.length + 16];
        System.arraycopy(iv, 0, message, 0, 12);
        System.arraycopy(encryptData, 0, message, 12, encryptData.length);
        if (base64Flg) {
            message = encodeByBase64(message);
        }
        return message;
    }

    
    public static byte[] decodeByGCM(Key key, byte[] data, boolean base64Flg) throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidAlgorithmParameterException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
        if (base64Flg) {
            data = decodeByBase64(data);
        }
        if (data.length < 12 + 16)
            throw new IllegalArgumentException();
        GCMParameterSpec params = new GCMParameterSpec(128, data, 0, 12);
        Cipher cipher = Cipher.getInstance(AES_GCM_PADDING);
        cipher.init(Cipher.DECRYPT_MODE, key, params);
        byte[] decryptData = cipher.doFinal(data, 12, data.length - 12);
        return decryptData;

    }

    
    private static SecretKeySpec getSecretKey(byte[] key) throws NoSuchAlgorithmException {
        KeyGenerator kg = KeyGenerator.getInstance(ALGORITHM);
        // 初始化密钥生成器，AES要求密钥长度为128位、192位、256位
        kg.init(256, new SecureRandom(key));
        SecretKey secretKey = kg.generateKey();
        return new SecretKeySpec(secretKey.getEncoded(), ALGORITHM);// 转换为AES专用密钥
    }

}

注:Base64是一种编码方式，加密后再使用Base64编码是为了防止有乱码

参考：https://blog.csdn.net/catoop/article/details/96431206?utm_medium=distribute.pc_relevant.none-task-blog-2~default~baidujs_baidulandingword~default-4-96431206-blog-121685228.pc_relevant_blogantidownloadv1&spm=1001.2101.3001.4242.3&utm_relevant_index=7