vite.api.utils.crypto.AesEncodeUtil Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of vite-javasdk Show documentation
vite java sdk
The newest version!
package vite.api.utils.crypto;

import org.apache.commons.codec.binary.Base64;
import org.bouncycastle.util.encoders.Hex;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.io.UnsupportedEncodingException;

public class AesEncodeUtil {

    //偏移量
    public static final String VIPARA = "(grin)tx?iv@vite";   //AES 为16bytes. DES 为8bytes

    //编码方式
    public static final String CODE_TYPE = "UTF-8";
//    public static final String CODE_TYPE = "GBK";

    //填充类型
    public static final String AES_TYPE = "AES/CTR/NoPadding";
    //public static final String AES_TYPE = "AES/ECB/PKCS7Padding";
    //此类型 加密内容,密钥必须为16字节的倍数位,否则抛异常,需要字节补全再进行加密
//    public static final String AES_TYPE = "AES/ECB/NoPadding";
    //java 不支持ZeroPadding
    //public static final String AES_TYPE = "AES/CBC/ZeroPadding";

    //私钥  
    private static final String AES_KEY = "1111222233334444";   //AES固定格式为128/192/256 bits.即：16/24/32bytes。DES固定格式为128bits，即8bytes。

    //字符补全
    private static final String[] consult = new String[]{"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F", "G"};


    /**
     * 加密
     *
     * @param cleartext
     * @return
     */
    public static String encrypt(byte[] asekey, String cleartext) {
        //加密方式： AES128(CBC/PKCS5Padding) + Base64, 私钥：1111222233334444  
        try {
            IvParameterSpec zeroIv = new IvParameterSpec(VIPARA.getBytes(CODE_TYPE));
            //两个参数，第一个为私钥字节数组， 第二个为加密方式 AES或者DES  
            SecretKeySpec key = new SecretKeySpec(asekey, "AES");
            //实例化加密类，参数为加密方式，要写全  
            Cipher cipher = Cipher.getInstance(AES_TYPE); //PKCS5Padding比PKCS7Padding效率高，PKCS7Padding可支持IOS加解密  
            //初始化，此方法可以采用三种方式，按加密算法要求来添加。（1）无第三个参数（2）第三个参数为SecureRandom random = new SecureRandom();中random对象，随机数。(AES不可采用这种方法)（3）采用此代码中的IVParameterSpec  
            //加密时使用:ENCRYPT_MODE;  解密时使用:DECRYPT_MODE;
            cipher.init(Cipher.ENCRYPT_MODE, key, zeroIv); //CBC类型的可以在第三个参数传递偏移量zeroIv,ECB没有偏移量
            //加密操作,返回加密后的字节数组，然后需要编码。主要编解码方式有Base64, HEX, UUE,7bit等等。此处看服务器需要什么编码方式 
            byte[] encryptedData = cipher.doFinal(cleartext.getBytes(CODE_TYPE));
            Base64 base64 =new Base64();
            return base64.encodeAsString(encryptedData);
        } catch (Exception e) {
            e.printStackTrace();
            return "";
        }
    }

    /**
     * 解密
     *
     * @param encrypted
     * @return
     */
    public static String decrypt(byte[] asekey, String encrypted) {
        try {

            Base64 base64 =new Base64();
            byte[] byteMi = base64.decode(encrypted);
            IvParameterSpec zeroIv = new IvParameterSpec(VIPARA.getBytes());
            SecretKeySpec key = new SecretKeySpec(
                    asekey, "AES");
            Cipher cipher = Cipher.getInstance(AES_TYPE);
            //与加密时不同MODE:Cipher.DECRYPT_MODE  
            cipher.init(Cipher.DECRYPT_MODE, key,zeroIv);  //CBC类型的可以在第三个参数传递偏移量zeroIv,ECB没有偏移量
            byte[] decryptedData = cipher.doFinal(byteMi);
            return new String(decryptedData, CODE_TYPE);
        } catch (Exception e) {
            e.printStackTrace();
            return "";
        }
    }

    /**
     * 测试
     *
     * @param args
     * @throws Exception
     */
    public static void main(String[] args) throws Exception {
        String content = "朱天涛 你好啊！";
        test(content);
    }

    public static void test(String content) throws UnsupportedEncodingException {
        System.out.println("加密内容：" + content);
        //字节数
        int num = content.getBytes(CODE_TYPE).length;
        System.out.println("加密内容字节数: " + num);
        System.out.println("加密内容是否16倍数: " + (num % 16 == 0 ? true : false));

        //字节补全
        if (AES_TYPE.equals("AES/ECB/NoPadding")) {
            System.out.println();
            content = completionCodeFor16Bytes(content);
            System.out.println("加密内容补全后: " + content);
        }

        System.out.println();

        // 加密
        String encryptResult = encrypt(Hex.decode("48dd3c46c36a23b7702d5a8d90dc0d6ae40692c87709083231f1e341ae5f2d45"), content);
        content = new String(encryptResult);
        System.out.println("加密后：" + encryptResult);

        System.out.println();

        // 解密
        String decryptResult = decrypt(Hex.decode("5d3dac276daacc501afbfd1b7cabce31f47f0c3087a97742683a6dcd5d6ad51f"), "TAnD4FyP");
        content = new String(decryptResult);
        //还原
        if (AES_TYPE.equals("AES/ECB/NoPadding")) {
            System.out.println("解密内容还原前: " + content);
            content = resumeCodeOf16Bytes(content);
        }

        System.out.println("解密完成后：" + content);
    }


    //NoPadding 
    //补全字符
    public static String completionCodeFor16Bytes(String str) throws UnsupportedEncodingException {
        int num = str.getBytes(CODE_TYPE).length;
        int index = num % 16;
        //进行加密内容补全操作, 加密内容应该为 16字节的倍数, 当不足16*n字节是进行补全, 差一位时 补全16+1位
        //补全字符 以 $ 开始,$后一位代表$后补全字符位数,之后全部以0进行补全;
        if (index != 0) {
            StringBuffer sbBuffer = new StringBuffer(str);
            if (16 - index == 1) {
                sbBuffer.append("$" + consult[16 - 1] + addStr(16 - 1 - 1));
            } else {
                sbBuffer.append("$" + consult[16 - index - 1] + addStr(16 - index - 1 - 1));
            }
            str = sbBuffer.toString();
        }
        return str;
    }

    //追加字符
    public static String addStr(int num) {
        StringBuffer sbBuffer = new StringBuffer("");
        for (int i = 0; i < num; i++) {
            sbBuffer.append("0");
        }
        return sbBuffer.toString();
    }


    //还原字符(进行字符判断)
    public static String resumeCodeOf16Bytes(String str) {
        int indexOf = str.lastIndexOf("$");
//    	System.out.println(indexOf);
        if (indexOf == -1) {
            return str;
        }
        String trim = str.substring(indexOf + 1, indexOf + 2).trim();
//    	System.out.println(trim);
        int num = 0;
        for (int i = 0; i < consult.length; i++) {
            if (trim.equals(consult[i])) {
                num = i;
            }
        }
        if (num == 0) {
            return str;
        }
        return str.substring(0, indexOf).trim();
    }


}