AES加密算法

添加maven依赖：

        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.4</version>
        </dependency>
        <dependency>
            <groupId>org.apache.directory.studio</groupId>
            <artifactId>org.apache.commons.codec</artifactId>
            <version>1.8</version>
        </dependency>

 

AES加密算法主要CBC，和EBC两种加密方法。两种加密方法都是是将明文分成128位的分组，EBC模式用秘钥对每个明文分组单独进行加密，而CBC模式后面分组的加密依赖前面分组参与加密过程，他需要一个秘钥KEY和一个初始向量IV

 

AES CBC加密模式需要一个初始向量IV，和秘钥KEY进行加密

CBC加密模式代码：

public class AESCBC {

    //解***(自行随机生成)
    public static final String KEY = "9B51BE373C236F20";//**key
    public static final String IV  = "6A136D8E7E8EEE78";//向量iv


    //加密
    public static String encrypt(String content){
        try {
            byte[] raw = KEY.getBytes("utf-8");
            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");

            //"算法/模式/补码方式"
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            //使用CBC模式，需要一个向量iv，可增加加密算法的强度
            IvParameterSpec ips = new IvParameterSpec(IV.getBytes());
            cipher.init(Cipher.ENCRYPT_MODE, skeySpec, ips);
            byte[] encrypted = cipher.doFinal(content.getBytes());
            return new BASE64Encoder().encode(encrypted);
        }catch (Exception e){
            e.printStackTrace();
            return null;
        }
    }

    //解密
    public static String decrypt(String content){
        try {
            byte[] raw = KEY.getBytes("utf-8");
            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            IvParameterSpec ips = new IvParameterSpec(IV.getBytes());
            cipher.init(Cipher.DECRYPT_MODE, skeySpec, ips);
            byte[] encrypted1 = new BASE64Decoder().decodeBuffer(content);
            byte[] original = cipher.doFinal(encrypted1);
            String originalString = new String(original);
            return originalString;

        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }


    public static void main(String[] args) {
        String content = "666666";
        System.out.println("加密前："+content);
        
        String ens1 = encrypt(content);

        System.out.println("加密后：" + ens1);

        System.out.println("解密后：" + decrypt(ens1));

    }
}

EBC加密模式代码：

public class AESECB {

    // AES加密要求key必须要128个比特位（这里需要长度为16，否则会报错）
    private static final String KEY = "9B51BE373C236F20";
    
    private static String encrypt(String content, String encryptKey){
        if(StringUtils.isEmpty(content) || StringUtils.isEmpty(encryptKey)){
            return null;
        }else {
            try {
                KeyGenerator kgen = KeyGenerator.getInstance("AES");
                kgen.init(128);
                Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
                cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(encryptKey.getBytes(), "AES"));
                return Base64.encodeBase64String(cipher.doFinal(content.getBytes("utf-8")));
            }catch (Exception e){
                e.printStackTrace();
                return null;
            }

        }

    }

    private static String decrypt(String encryptStr, String decryptKey){
        if(StringUtils.isEmpty(encryptStr) || StringUtils.isEmpty(decryptKey)){
            return null;
        }else {
            try {
                KeyGenerator kgen = KeyGenerator.getInstance("AES");
                kgen.init(128);

                Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
                cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(decryptKey.getBytes(), "AES"));
                byte[] decryptBytes = cipher.doFinal(new BASE64Decoder().decodeBuffer(encryptStr));

                return new String(decryptBytes);
            }catch (Exception e){
                e.printStackTrace();
                return null;
            }
        }
    }
    public static void main(String[] args){
        String content = "12tffggfgfhgaeaddaa4524";

        System.out.println("加密前：" + content);

        System.out.println("加***和解***：" + KEY);

        String enc = encrypt(content, KEY);
        System.out.println("加密后：" + enc);

        String dec = decrypt(enc, KEY);

        System.out.println("解密后：" + dec);
    }

}