com.admin4j.common.crypto.AesUtil Maven / Gradle / Ivy
package com.admin4j.common.crypto;
import com.admin4j.common.exception.EncryptException;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.util.Base64;
/**
* AES-128-CBC 算法
* iv 默认取key
*
* @author andanyang
* @since 2023/9/19 10:04
*/
public class AesUtil {
/**
* AES
*/
static String ALGORITHM = "AES";
/**
* AES 算法
*/
static String AES_CBC_CIPHER = "AES/CBC/PKCS5Padding";
/**
* 偏移量
*/
private static final int OFFSET = 16;
/**
* 加密
*
* @param data 需要加密的内容
* @param key 加密密码
* @param iv 加密密码
* @return
*/
public static byte[] encrypt(byte[] data, byte[] key, byte[] iv) {
try {
if (key.length < OFFSET) {
byte[] tmp = new byte[OFFSET];
System.arraycopy(key, 0, tmp, 0, key.length);
key = tmp;
}
if (iv.length < 16) {
byte[] tmp = new byte[16];
System.arraycopy(iv, 0, tmp, 0, iv.length);
iv = tmp;
}
SecretKeySpec secretKey = new SecretKeySpec(key, ALGORITHM);
IvParameterSpec ivParameterSpec = new IvParameterSpec(iv, 0, OFFSET);
Cipher cipher = Cipher.getInstance(AES_CBC_CIPHER);
cipher.init(Cipher.ENCRYPT_MODE, secretKey, ivParameterSpec);
return cipher.doFinal(data);
} catch (Exception e) {
throw new EncryptException("aes encrypt error:" + e.getMessage(), e);
}
}
/**
* 解密
*
* @param data 待解密内容
* @param key 解密密钥
* @return
*/
public static byte[] decrypt(byte[] data, byte[] key, byte[] iv) {
try {
if (key.length < 16) {
byte[] tmp = new byte[16];
System.arraycopy(key, 0, tmp, 0, key.length);
key = tmp;
}
if (iv.length < 16) {
byte[] tmp = new byte[16];
System.arraycopy(iv, 0, tmp, 0, iv.length);
iv = tmp;
}
SecretKeySpec secretKey = new SecretKeySpec(key, ALGORITHM);
IvParameterSpec ivParameterSpec = new IvParameterSpec(iv, 0, OFFSET);
Cipher cipher = Cipher.getInstance(AES_CBC_CIPHER);
cipher.init(Cipher.DECRYPT_MODE, secretKey, ivParameterSpec);
return cipher.doFinal(data);
} catch (Exception e) {
throw new EncryptException("ase decrypt error", e);
}
}
/**
* 加密
*
* * 定义 aes 加密的key
* * 密钥 必须是16位, 自定义,
* * 如果不是16位, 则会出现InvalidKeyException: Illegal key size
* * 解决方案有两种：
* * 需要安装Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy Files(可以在Oracle下载).
* * .设置设置key的长度为16个字母和数字的字符窜（128 Bit/8=16字符）就不报错了。
*
* @param data 需要加密的内容
* @param key 加密密码
* @return
*/
public static String encrypt(String data, String key) {
byte[] keyBytes = key.getBytes(StandardCharsets.UTF_8);
byte[] valueByte = encrypt(data.getBytes(StandardCharsets.UTF_8), keyBytes, keyBytes);
return Base64.getEncoder().encodeToString(valueByte);
}
/**
* 解密
*
* @param data 待解密内容 base64 字符串
* @param key 解密密钥
* @return
*/
public static String decrypt(String data, String key) {
byte[] originalData = Base64.getDecoder().decode(data.getBytes());
byte[] keyBytes = key.getBytes(StandardCharsets.UTF_8);
byte[] valueByte = decrypt(originalData, keyBytes, keyBytes);
return new String(valueByte);
}
}