Java实现加密（一）AES加解密
import org.apache.commons.lang3.RandomStringUtils;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.Base64Utils;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
/**
* AES加密工具类
*
* @author ACGkaka
* @since 2021-06-18 19:11:03
*/
public class AESUtil {
/**
* 日志相关
*/
private static final Logger LOGGER = LoggerFactory.getLogger(AESUtil.class);
/**
* 编码
*/
private static final String ENCODING = "UTF-8";
/**
* 算法定义
*/
private static final String AES_ALGORITHM = "AES";
/**
* 指定填充方式
*/
private static final String CIPHER_PADDING = "AES/ECB/PKCS5Padding";
private static final String CIPHER_CBC_PADDING = "AES/CBC/PKCS5Padding";
/**
* 偏移量(CBC中使用，增强加密算法强度)
*/
private static final String IV_SEED = "1234567812345678";
/**
* AES加密
* @param content 待加密内容
* @param aesKey 密码
* @return
*/
public static String encrypt(String content, String aesKey){
if(StringUtils.isBlank(content)){
LOGGER.info("AES encrypt: the content is null!");
return null;
}
//判断秘钥是否为16位
if(StringUtils.isNotBlank(aesKey) && aesKey.length() == 16){
try {
//对密码进行编码
byte[] bytes = aesKey.getBytes(ENCODING);
//设置加密算法，生成秘钥
SecretKeySpec skeySpec = new SecretKeySpec(bytes, AES_ALGORITHM);
// "算法/模式/补码方式"
Cipher cipher = Cipher.getInstance(CIPHER_PADDING);
//选择加密
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
//根据待加密内容生成字节数组
byte[] encrypted = cipher.doFinal(content.getBytes(ENCODING));
//返回base64字符串
return Base64Utils.encodeToString(encrypted);
} catch (Exception e) {
LOGGER.info("AES encrypt exception:" + e.getMessage());
throw new RuntimeException(e);
}
}else {
LOGGER.info("AES encrypt: the aesKey is null or error!");
return null;
}
}
/**
* 解密
*
* @param content 待解密内容
* @param aesKey 密码
* @return
*/
public static String decrypt(String content, String aesKey){
if(StringUtils.isBlank(content)){
LOGGER.info("AES decrypt: the content is null!");
return null;
}
//判断秘钥是否为16位
if(StringUtils.isNotBlank(aesKey) && aesKey.length() == 16){
try {
//对密码进行编码
byte[] bytes = aesKey.getBytes(ENCODING);
//设置解密算法，生成秘钥
SecretKeySpec skeySpec = new SecretKeySpec(bytes, AES_ALGORITHM);
// "算法/模式/补码方式"
Cipher cipher = Cipher.getInstance(CIPHER_PADDING);
//选择解密
cipher.init(Cipher.DECRYPT_MODE, skeySpec);
//先进行Base64解码
byte[] decodeBase64 = Base64Utils.decodeFromString(content);
//根据待解密内容进行解密
byte[] decrypted = cipher.doFinal(decodeBase64);
//将字节数组转成字符串
return new String(decrypted, ENCODING);
} catch (Exception e) {
LOGGER.info("AES decrypt exception:" + e.getMessage());
throw new RuntimeException(e);
}
}else {
LOGGER.info("AES decrypt: the aesKey is null or error!");
return null;
}
}
/**
* AES_CBC加密
*
* @param content 待加密内容
* @param aesKey 密码
* @return
*/
public static String encryptCBC(String content, String aesKey){
if(StringUtils.isBlank(content)){
LOGGER.info("AES_CBC encrypt: the content is null!");
return null;
}
//判断秘钥是否为16位
if(StringUtils.isNotBlank(aesKey) && aesKey.length() == 16){
try {
//对密码进行编码
byte[] bytes = aesKey.getBytes(ENCODING);
//设置加密算法，生成秘钥
SecretKeySpec skeySpec = new SecretKeySpec(bytes, AES_ALGORITHM);
// "算法/模式/补码方式"
Cipher cipher = Cipher.getInstance(CIPHER_CBC_PADDING);
//偏移
IvParameterSpec iv = new IvParameterSpec(IV_SEED.getBytes(ENCODING));
//选择加密
cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
//根据待加密内容生成字节数组
byte[] encrypted = cipher.doFinal(content.getBytes(ENCODING));
//返回base64字符串
return Base64Utils.encodeToString(encrypted);
} catch (Exception e) {
LOGGER.info("AES_CBC encrypt exception:" + e.getMessage());
throw new RuntimeException(e);
}
}else {
LOGGER.info("AES_CBC encrypt: the aesKey is null or error!");
return null;
}
}
/**
* AES_CBC解密
*
* @param content 待解密内容
* @param aesKey 密码
* @return
*/
public static String decryptCBC(String content, String aesKey){
if(StringUtils.isBlank(content)){
LOGGER.info("AES_CBC decrypt: the content is null!");
return null;
}
//判断秘钥是否为16位
if(StringUtils.isNotBlank(aesKey) && aesKey.length() == 16){
try {
//对密码进行编码
byte[] bytes = aesKey.getBytes(ENCODING);
//设置解密算法，生成秘钥
SecretKeySpec skeySpec = new SecretKeySpec(bytes, AES_ALGORITHM);
//偏移
IvParameterSpec iv = new IvParameterSpec(IV_SEED.getBytes(ENCODING));
// "算法/模式/补码方式"
Cipher cipher = Cipher.getInstance(CIPHER_CBC_PADDING);
//选择解密
cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
//先进行Base64解码
byte[] decodeBase64 = Base64Utils.decodeFromString(content);
//根据待解密内容进行解密
byte[] decrypted = cipher.doFinal(decodeBase64);
//将字节数组转成字符串
return new String(decrypted, ENCODING);
} catch (Exception e) {
LOGGER.info("AES_CBC decrypt exception:" + e.getMessage());
throw new RuntimeException(e);
}
}else {
LOGGER.info("AES_CBC decrypt: the aesKey is null or error!");
return null;
}
}
public static void main(String[] args) {
// AES支持三种长度的密钥：128位、192位、256位。
// 代码中这种就是128位的加密密钥，16字节 * 8位/字节 = 128位。
String random = RandomStringUtils.random(16, "abcdefghijklmnopqrstuvwxyz1234567890");
System.out.println("随机key:" + random);
System.out.println();
System.out.println("---------加密---------");
String aesResult = encrypt("测试AES加密12", random);
System.out.println("aes加密结果:" + aesResult);
System.out.println();
System.out.println("---------解密---------");
String decrypt = decrypt(aesResult, random);
System.out.println("aes解密结果:" + decrypt);
System.out.println();
System.out.println("--------AES_CBC加密解密---------");
String cbcResult = encryptCBC("测试AES加密12456", random);
System.out.println("aes_cbc加密结果:" + cbcResult);
System.out.println();
System.out.println("---------解密CBC---------");
String cbcDecrypt = decryptCBC(cbcResult, random);
System.out.println("aes解密结果:" + cbcDecrypt);
System.out.println();
}
}