DES加密算法java
时间: 2023-10-29 17:55:21 浏览: 80
以下是使用Java实现DES加密算法的示例代码:
```java
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.util.Base64;
public class DESUtil {
private static final String ALGORITHM = "DES";
/**
* 生成DES密钥
*
* @param keySize 密钥长度,一般为56位
* @return 密钥字符串
* @throws Exception
*/
public static String generateKey(int keySize) throws Exception {
KeyGenerator keyGenerator = KeyGenerator.getInstance(ALGORITHM);
keyGenerator.init(keySize);
SecretKey secretKey = keyGenerator.generateKey();
return Base64.getEncoder().encodeToString(secretKey.getEncoded());
}
/**
* DES加密
*
* @param data 待加密数据
* @param key 密钥字符串
* @return 加密后的数据
* @throws Exception
*/
public static String encrypt(String data, String key) throws Exception {
byte[] keyBytes = Base64.getDecoder().decode(key);
SecretKeySpec secretKeySpec = new SecretKeySpec(keyBytes, ALGORITHM);
Cipher cipher = Cipher.getInstance(ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec);
byte[] encryptedBytes = cipher.doFinal(data.getBytes());
return Base64.getEncoder().encodeToString(encryptedBytes);
}
/**
* DES解密
*
* @param data 待解密数据
* @param key 密钥字符串
* @return 解密后的数据
* @throws Exception
*/
public static String decrypt(String data, String key) throws Exception {
byte[] keyBytes = Base64.getDecoder().decode(key);
SecretKeySpec secretKeySpec = new SecretKeySpec(keyBytes, ALGORITHM);
Cipher cipher = Cipher.getInstance(ALGORITHM);
cipher.init(Cipher.DECRYPT_MODE, secretKeySpec);
byte[] decryptedBytes = cipher.doFinal(Base64.getDecoder().decode(data));
return new String(decryptedBytes);
}
}
```
使用示例:
```java
public class Main {
public static void main(String[] args) throws Exception {
String data = "Hello, DES!";
String key = DESUtil.generateKey(56);
String encryptedData = DESUtil.encrypt(data, key);
System.out.println("加密后的数据:" + encryptedData);
String decryptedData = DESUtil.decrypt(encryptedData, key);
System.out.println("解密后的数据:" + decryptedData);
}
}
```