DES加解密

package encrypt;

import java.security.Key;
import java.security.SecureRandom;
import java.util.Base64;
import java.util.Base64.Decoder;
import java.util.Base64.Encoder;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;

public class DESUtil {
    private static Key key;
    private static String KEY_STR="myKey";//密钥
    static{
        try {
            KeyGenerator generator = KeyGenerator.getInstance("DES");
            generator.init(new SecureRandom(KEY_STR.getBytes()));
            key = generator.generateKey();
            generator=null;
        } catch (Exception e) {
            
        }
    }
    
    public static String getEncryptString(String str){
        Encoder base64Encoder = Base64.getEncoder();
        try {
            byte[] strBytes = str.getBytes("UTF-8");
            Cipher cipher = Cipher.getInstance("DES");
            cipher.init(Cipher.ENCRYPT_MODE, key);
            byte[] encryptStrBytes = cipher.doFinal(strBytes);
            return base64Encoder.encodeToString(encryptStrBytes);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null; 
    }
    
    public static String getDecryptString(String str){
        Decoder base64Decoder = Base64.getDecoder();
        try {
            byte[] strBytes = base64Decoder.decode(str);
            Cipher cipher = Cipher.getInstance("DES");
            cipher.init(cipher.DECRYPT_MODE, key);
            byte[] decryptStrBytes = cipher.doFinal(strBytes);
            return new String(decryptStrBytes,"UTF-8");
        } catch (Exception e) {
        }
        return null;
        
    }
    public static void main(String[] args) {
        System.out.println(DESUtil.getEncryptString("147258"));
        System.out.println(DESUtil.getDecryptString("VUhJSh5OPvI="));
    }
}

https://www.cnblogs.com/wulm/p/6907197.html