DES对称加密,对称加密,是一种比较传统的加密方式,其加密运算、解密运算使用的是同样的密钥,信息的发送者和信息的接收者在进行信息的传输与处理时,必须共同持有该密码(称为对称密码),是一对称加密算法。
密钥长度56位+8位校验位,生命周期短。
(1)工作模式 ECB、CBC、PCBC、CTR、CTS、CFB、CFB8-CFB128、OFB、OFB8-OFB128. (2) 填充模式 NoPadding、PKCS5Padding、ISO10126Padding (3) 代码实现
package lzf.cipher.jdk;
import java.nio.charset.Charset;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
/**
* @author Java小工匠
*/
public class DesUtils {
// 获取 DES Key
public static byte[] getDesKey() {
try {
// 1、创建密钥生成器
KeyGenerator keyGenerator = KeyGenerator.getInstance("DES");
keyGenerator.init(56);
// 2、产生密钥
SecretKey secretKey = keyGenerator.generateKey();
// 3、获取密钥
byte[] key = secretKey.getEncoded();
return key;
} catch (Exception e) {
throw new RuntimeException(e);
}
}
// DES 解密
public static byte[] encryptDes(byte[] data, byte[] key) {
try {
SecretKey secretKey = new SecretKeySpec(key, "DES");
String type = "DES";
// 加工作模式和填充方式
// type= "DES/ECB/PKCS5Padding";
Cipher cipher = Cipher.getInstance(type);
cipher.init(Cipher.ENCRYPT_MODE, secretKey);
byte[] rsData = cipher.doFinal(data);
return rsData;
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public static byte[] decryptDes(byte[] data, byte[] key) {
try {
SecretKey secretKey = new SecretKeySpec(key, "DES");
String type = "DES";
// 加工作模式和填充方式
// type= "DES/ECB/PKCS5Padding";
Cipher cipher = Cipher.getInstance(type);
cipher.init(Cipher.DECRYPT_MODE, secretKey);
byte[] rsData = cipher.doFinal(data);
return rsData;
} catch (Exception e) {
throw new RuntimeException(e);
}
}
// 字节数组转16 进制
public static String bytesToHexStr(byte[] bytes, boolean blow) {
if (bytes == null) {
return "";
}
StringBuilder sb = new StringBuilder();
for (byte b : bytes) {
int v = b & 0xFF;
String hv = Integer.toHexString(v);
if (hv.length() < 2) {
sb.append("0");
}
sb.append(hv);
}
String rs = sb.toString();
if (!blow) {
rs = rs.toUpperCase();
}
return rs;
}
public static void main(String[] args) {
byte[] data = "java小工匠".getBytes(Charset.forName("UTF-8"));
byte[] key = getDesKey();
System.out.println("DES KEY:" + bytesToHexStr(key, true));
byte[] encryptData = encryptDes(data, key);
System.out.println("encrypt data:" + bytesToHexStr(encryptData, true));
byte[] decryptData = decryptDes(encryptData, key);
System.out.println("decrypt data:" + new String(decryptData));
}
}