信息计算2019级2班8号张黎曦

张黎曦

mooc截图

张黎曦

package mimaxue;


import java.io.IOException;
import java.security.SecureRandom;
import java.util.Arrays;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;



import java.util.Base64;
import java.util.Base64.Encoder;
import java.util.Base64.Decoder;


public class AesCryptTest {  
    public final String KEY_ALGORITHM = "AES";  
    public final String CIPHER_ALGORITHM_CBC = "AES/CBC/PKCS5Padding";  
    public SecretKey secretKey;  
    public Cipher cipher;  

    public static void main(String[] args) throws Exception {  
        AesCryptTest act = new AesCryptTest();  
        String originString = "拒绝摆烂，从我做起！";  

        // 加密数据  
        System.out.println("加密数据： " + originString);  
        String enString = act.encode(originString);  

        // 解密数据  
        String deString = act.decode(enString);  
        System.out.println("解密结果： " + deString);  
    }  

    public String encode(String oriStr) throws Exception {   
        KeyGenerator kgen = KeyGenerator.getInstance(KEY_ALGORITHM);  
        SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");  
        secureRandom.setSeed(getIV());  
        // 根据密钥初始化密钥生成器  
        kgen.init(128, secureRandom);  
        secretKey = kgen.generateKey();  

        cipher = Cipher.getInstance(CIPHER_ALGORITHM_CBC);  
        cipher.init(Cipher.ENCRYPT_MODE, secretKey,  
                new IvParameterSpec(getIV()));// 使用*加密*模式初始化 密钥  

        // 加密数据  
        byte[] encByte = cipher.doFinal(oriStr.getBytes());   
        // 编码，将由逗号、数字组成的字节数组转化为不易辨别的字符串  
        Encoder enc = Base64.getEncoder();
        String encStr = enc.encodeToString(encByte);  

        System.out.println("加密后数组（编码后） ： " + encStr);  
        return encStr;  
    }  

    public String decode(String encStr) throws Exception {  
            Base64.Decoder dec =Base64.getDecoder();  
        byte[] encByteArr = null;  
        encByteArr = dec.decode(encStr);  

        KeyGenerator kgen = KeyGenerator.getInstance(KEY_ALGORITHM);
        SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");  
        secureRandom.setSeed(getIV());  

        kgen.init(128, secureRandom);  
        secretKey = kgen.generateKey();

        cipher = Cipher.getInstance(CIPHER_ALGORITHM_CBC);  
        cipher.init(Cipher.DECRYPT_MODE, secretKey,  
                new IvParameterSpec(getIV()));// 使用*解密*模式初始化 密钥  

        // 解密数据  
        byte[] decByte = cipher.doFinal(encByteArr);  
        System.out.println("解密后数组 ： " + Arrays.toString(decByte));  

        return new String(decByte);  
    }  

    static byte[] getIV() {  
        String iv = "0123456789abcdef";
        return iv.getBytes();  
    }  

}