java aes加密解密算法 JAVA AES加密/解密

  谨以此祭奠我的AES坎坷历程（当作一份笔记）

  <pre class="prettyprint">`package com.bubble.encrypt.pass;
import java.io.UnsupportedEncodingException;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
/**

• Created by Bubble on 2017/6/15.
• AES-CBC-A28加密解密算法
  */

public class AesUtils {

/**
 * 算法/模式/填充
 **/
private static final String CipherMode = "AES/CBC/PKCS5Padding";
private static String sKey = "";//必须16位
private static String ivParameter = "ubateubatequanli";//必须16位
/**
 * 加密(结果为16进制字符串)
 **/
public static String encrypt(String content, String key) {
    byte[] data = null;
    try {
        data = content.getBytes("UTF-8");
    } catch (Exception e) {
        e.printStackTrace();
    }

<p>

    data = encrypt(data, key, ivParameter);
    String result = byte2hex(data);
    return result;
}
/**
 * 加密字节数据
 **/
public static byte[] encrypt(byte[] content, String password, String iv) {
    try {
        SecretKeySpec key = createKey(password);
        Cipher cipher = Cipher.getInstance(CipherMode);
        cipher.init(Cipher.ENCRYPT_MODE, key, createIV(iv));
        byte[] result = cipher.doFinal(content);
        return result;
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}
/**
 * 解密(输出结果为字符串)
 **/
public static String decrypt(String content, String key) {
    byte[] data = null;
    try {
        data = hex2byte(content);
    } catch (Exception e) {

  

        e.printStackTrace();
    }
    data = decrypt(data, key, ivParameter);
    if (data == null)
        return null;
    String result = null;
    try {
        result = new String(data, "UTF-8");
    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    }
    return result;
}
/**
 * 解密字节数组
 **/
public static byte[] decrypt(byte[] content, String password, String iv) {
    try {
        SecretKeySpec key = createKey(password);
        Cipher cipher = Cipher.getInstance(CipherMode);
        cipher.init(Cipher.DECRYPT_MODE, key, createIV(iv));
        byte[] result = cipher.doFinal(content);
        return result;
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}

  

/**
 * 字节数组转成16进制字符串
 **/
public static String byte2hex(byte[] b) { // 一个字节的数，
    StringBuffer sb = new StringBuffer(b.length * 2);
    String tmp = "";
    for (int n = 0; n < b.length; n++) {
        // 整数转成十六进制表示
        tmp = (Integer.toHexString(b[n] & 0XFF));
        if (tmp.length() == 1) {
            sb.append("0");
        }
        sb.append(tmp);
    }
    return sb.toString().toUpperCase(); // 转成大写
}
/**
 * 将hex字符串转换成字节数组
 **/
private static byte[] hex2byte(String inputString) {
    if (inputString == null || inputString.length() < 2) {
        return new byte[0];
    }
    inputString = inputString.toLowerCase();
    int l = inputString.length() / 2;
    byte[] result = new byte[l];
    for (int i = 0; i < l; ++i) {

  

        String tmp = inputString.substring(2 * i, 2 * i + 2);
        result[i] = (byte) (Integer.parseInt(tmp, 16) & 0xFF);
    }
    return result;
}
/**
 * 创建密钥
 **/
private static SecretKeySpec createKey(String key) {
    byte[] data = null;
    if (key == null) {
        key = "";
    }
    StringBuffer sb = new StringBuffer(16);
    sb.append(key);
    while (sb.length() < 16) {
        sb.append("0");
    }
    if (sb.length() > 16) {
        sb.setLength(16);
    }
    try {
        data = sb.toString().getBytes("UTF-8");
    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    }
    return new SecretKeySpec(data, "AES");
}

private static IvParameterSpec createIV(String password) {
    byte[] data = null;
    if (password == null) {
        password = "";
    }
    StringBuffer sb = new StringBuffer(16);
    sb.append(password);
    while (sb.length() < 16) {
        sb.append("0");
    }
    if (sb.length() > 16) {
        sb.setLength(16);
    }
    try {
        data = sb.toString().getBytes("UTF-8");
    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    }
    return new IvParameterSpec(data);
}

}
`</pre></p>
  跟后台对接使用时的坑（当时后台时PHP）

  1.JDK自带jar包不支持256位AES加密java aes加密解密算法java aes加密解密算法 JAVA AES加密/解密，需要到官网上下载下面两个jar包替换下面目录中的文件【文件目录：/jre/lib/】：

  

  2.实践中发现JAVA中IV【初始化向量不可以为32位java aes加密解密算法，否则异常java..: Wrong IV : must be 16 bytes long】

  注：哪位大牛有解决IV是32位的方法告知小弟，苦逼的看了源码也没有研究明白。

  文章来源:https://blog.csdn.net/yuanfen97/article/details/73303272