基于java类库的3DES加密算法实现

来源：互联网发布：mac睡眠时间编辑：程序博客网时间：2024/06/06 20:33

别看3DES的代码很复杂，其实和DES代码一样，核心代码就那么几行

加密部分的核心Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");cipher.init(Cipher.ENCRYPT_MODE, deskey);return cipher.doFinal(data);解密部分的核心Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");cipher.init(Cipher.DECRYPT_MODE,deskey);return cipher.doFinal(data);

完整代码

package DES;import javax.crypto.Cipher;import javax.crypto.SecretKey;import javax.crypto.spec.SecretKeySpec;public class ThreeDESUtil {   //key 根据实际情况对应的修改   private final byte[] keybyte="123456788765432112345678".getBytes(); //keybyte为加密密钥，长度为24字节   private static final String Algorithm = "DESede"; //定义 加密算法,可用 DES,DESede,Blowfish   private SecretKey deskey;   //生成密钥   public ThreeDESUtil(){       deskey = new SecretKeySpec(keybyte, Algorithm);   }   //加密   public byte[] encrypt(byte[] data){        try {            Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");            cipher.init(Cipher.ENCRYPT_MODE, deskey);            return cipher.doFinal(data);        } catch (Exception ex) {            //加密失败，打日志            ex.printStackTrace();        }         return null;   }   //解密   public byte[] decrypt(byte[] data){       try {            Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");            cipher.init(Cipher.DECRYPT_MODE,deskey);            return cipher.doFinal(data);        } catch (Exception ex) {            //解密失败，打日志            ex.printStackTrace();        }         return null;   }   public static void main(String[] args) throws Exception {       ThreeDESUtil des=new ThreeDESUtil();       String req ="cryptology";       String toreq  = toHexString(req);       System.err.println("十六进制报文=="+toreq);       byte[] srcData=req.toString().getBytes("utf-8");       byte[] encryptData=des.encrypt(srcData);       System.out.println("密文：");       if(encryptData!=null){           for(int i=0;i<encryptData.length;i++){               String hex=Integer.toHexString(encryptData[i]);               if(hex.length()>1)                System.out.print(hex.substring(hex.length()-2)+" ");               else                System.out.print("0"+hex+" ");           }       }       System.out.println("");       System.out.println("明文："+req);   }   // 转化字符串为十六进制编码   public static String toHexString(String s) {       String str = "";       for (int i = 0; i < s.length(); i++) {           int ch = (int) s.charAt(i);           String s4 = Integer.toHexString(ch);           str = str + s4;       }       return str;   }}

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