java aes加密解密工具类
时间: 2023-08-18 10:07:43 浏览: 73
以下是 Java 中使用 AES 加密解密的工具类,其中包括了 AES/CBC/PKCS5Padding 算法的加密解密方法:
```java
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.util.Base64;
public class AESUtil {
private static final String ALGORITHM_AES = "AES";
private static final String CIPHER_AES_CBC_PKCS5PADDING = "AES/CBC/PKCS5Padding";
private static final String IV = "0123456789abcdef"; // 16 位
/**
* AES 加密
*
* @param data 需要加密的数据
* @param key 密钥字符串(16、24 或 32 位)
* @return 加密后的字符串
*/
public static String encryptByAES(String data, String key) {
try {
byte[] keyBytes = key.getBytes(StandardCharsets.UTF_8);
SecretKeySpec secretKeySpec = new SecretKeySpec(keyBytes, ALGORITHM_AES);
Cipher cipher = Cipher.getInstance(CIPHER_AES_CBC_PKCS5PADDING);
IvParameterSpec ivParameterSpec = new IvParameterSpec(IV.getBytes(StandardCharsets.UTF_8));
cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, ivParameterSpec);
byte[] encryptedBytes = cipher.doFinal(data.getBytes(StandardCharsets.UTF_8));
return Base64.getEncoder().encodeToString(encryptedBytes);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* AES 解密
*
* @param data 需要解密的数据
* @param key 密钥字符串(16、24 或 32 位)
* @return 解密后的字符串
*/
public static String decryptByAES(String data, String key) {
try {
byte[] keyBytes = key.getBytes(StandardCharsets.UTF_8);
SecretKeySpec secretKeySpec = new SecretKeySpec(keyBytes, ALGORITHM_AES);
Cipher cipher = Cipher.getInstance(CIPHER_AES_CBC_PKCS5PADDING);
IvParameterSpec ivParameterSpec = new IvParameterSpec(IV.getBytes(StandardCharsets.UTF_8));
cipher.init(Cipher.DECRYPT_MODE, secretKeySpec, ivParameterSpec);
byte[] encryptedBytes = Base64.getDecoder().decode(data);
byte[] decryptedBytes = cipher.doFinal(encryptedBytes);
return new String(decryptedBytes, StandardCharsets.UTF_8);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}
```
使用示例:
```java
public static void main(String[] args) {
String data = "Hello, world!";
String key = "1234567890123456";
String encryptedData = AESUtil.encryptByAES(data, key);
System.out.println("加密后的数据:" + encryptedData);
String decryptedData = AESUtil.decryptByAES(encryptedData, key);
System.out.println("解密后的数据:" + decryptedData);
}
```