import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.security.SecureRandom;
import java.util.Base64;
public class AESUtil {
// AES密钥算法
private static final String KEY_ALGORITHM = "AES";
// 加密/解密算法/工作模式/填充方式
private static final String CIPHER_ALGORITHM = "AES/ECB/PKCS5Padding";
// 生成密钥
public static String generateAESKey() throws Exception {
KeyGenerator keyGenerator = KeyGenerator.getInstance(KEY_ALGORITHM);
keyGenerator.init(128, new SecureRandom()); // 192 and 256 bits may not be available
SecretKey secretKey = keyGenerator.generateKey();
return Base64.getEncoder().encodeToString(secretKey.getEncoded());
}
// AES加密
public static String encryptAES(String data, String key) throws Exception {
Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
SecretKeySpec secretKeySpec = new SecretKeySpec(Base64.getDecoder().decode(key), KEY_ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec);
byte[] encrypted = cipher.doFinal(data.getBytes());
return Base64.getEncoder().encodeToString(encrypted);
}
// AES解密
public static String decryptAES(String data, String key) throws Exception {
Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
SecretKeySpec secretKeySpec = new SecretKeySpec(Base64.getDecoder().decode(key), KEY_ALGORITHM);
cipher.init(Cipher.DECRYPT_MODE, secretKeySpec);
byte[] decrypted = cipher.doFinal(Base64.getDecoder().decode(data));
return new String(decrypted);
}
public static void main(String[] args) {
try {
String key = generateAESKey();
String originalText = "Hello World!";
String encryptedText = encryptAES(originalText, key);
String decryptedText = decryptAES(encryptedText, key);
System.out.println("Original Text : " + originalText);
System.out.println("Encrypted Text : " + encryptedText);
System.out.println("Decrypted Text : " + decryptedText);
} catch (Exception e) {
e.printStackTrace();
}
}
}这段代码提供了AES加密和解密的基本操作，包括密钥的生成、加密和解密。在main方法中，我们生成了一个密钥，用这个密钥对字符串"Hello Wo