代码如下
import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;
import java.security.Key;
import java.util.Base64;
public class DESUtil {
/**
* 偏移变量，固定占8位字节
*/
private final static String IV_PARAMETER = "12345678";
/**
* 密钥算法
*/
private static final String ALGORITHM = "DES";
/**
* 加密/解密算法-工作模式-填充模式
* DES共有四种工作模式-->>ECB：电子密码本模式、CBC：加密分组链接模式、CFB：加密反馈模式、OFB：输出反馈模式
*/
private static final String CIPHER_ALGORITHM = "DES/CBC/PKCS5Padding";
/**
* 默认编码
*/
private static final String CHARSET = "utf-8";
/**
* 生成key
*
* @param password 密钥字符串
* @return 密钥对象
* @throws Exception
*/
private static Key generateKey(String password) throws Exception {
DESKeySpec dks = new DESKeySpec(password.getBytes(CHARSET));
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(ALGORITHM);
return keyFactory.generateSecret(dks);
}
/**
* DES加密字符串
*
* @param password 加密密码，长度不能够小于8位
* @param data 待加密字符串
* @return 加密后内容(十六进制字符串)
*/
public static String encrypt(String password, String data) {
if (password == null || password.length() < 8) {
throw new RuntimeException("加密失败，key不能小于8位");
}
if (data == null)
return null;
try {
Key secretKey = generateKey(password);
Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
IvParameterSpec iv = new IvParameterSpec(IV_PARAMETER.getBytes(CHARSET));
cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);
byte[] bytes = cipher.doFinal(data.getBytes(CHARSET));
//return new String(Base64.getEncoder().encode(bytes));
return byte2HexString(bytes);
} catch (Exception e) {
e.printStackTrace();
return data;
}
}
/**
* DES解密字符串
*
* @param password 解密密码，长度不能够小于8位
* @param data 待解密字符串(十六进制字符串)
* @return 解密后内容
*/
public static String decrypt(String password, String data) {
if (password == null || password.length() < 8) {
throw new RuntimeException("加密失败，key不能小于8位");
}
if (data == null)
return null;
try {
Key secretKey = generateKey(password);
Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
IvParameterSpec iv = new IvParameterSpec(IV_PARAMETER.getBytes(CHARSET));
cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);
byte[] bytes = hexStringToByteArray(data);
return new String(cipher.doFinal(bytes), CHARSET);
//return new String(cipher.doFinal(Base64.getDecoder().decode(data.getBytes(CHARSET))));
} catch (Exception e) {
e.printStackTrace();
return data;
}
}
/**
* byte数组转十六进制
*
* @param bytes
* @return
*/
public static String byte2HexString(byte[] bytes) {
StringBuilder hex = new StringBuilder();
if (bytes != null) {
for (Byte b : bytes) {
hex.append(String.format("%02X", b.intValue() & 0xFF));
}
}
return hex.toString();
}
/**
* 十六进制转byte数组
*
* @param s
* @return
*/
public static byte[] hexStringToByteArray(String s) {
int len = s.length();
byte[] data = new byte[len / 2];
try {
for (int i = 0; i < len; i += 2) {
data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4)
+ Character.digit(s.charAt(i + 1), 16));
}
} catch (Exception e) {
e.printStackTrace();
}
return data;
}
//测试
public static void main(String[] args) throws Exception {
String source = "admin测试信息1234!@#$%^&*()_+";
System.out.println("原 文: " + source);
String password = "lw112190@2023";
String encryptData = encrypt(password, source);
System.out.println("加密后: " + encryptData);
String decryptData = decrypt(password, encryptData);
System.out.println("解密后: " + decryptData);
}
}测试信息
原 文: admin测试信息1234!@#$%^&*()_+
加密后: 1D5C21B694A9085A69BE7EA37C197D1632239545298613B944C3AC272750A519F66FB43EFEC55C89
解密后: admin测试信息1234!@#$%^&*()_+
