package com.zt.zhpt;
|
import java.io.UnsupportedEncodingException;
|
import java.security.InvalidKeyException;
|
import java.security.NoSuchAlgorithmException;
|
import java.security.SecureRandom;
|
|
import javax.crypto.BadPaddingException;
|
import javax.crypto.Cipher;
|
import javax.crypto.IllegalBlockSizeException;
|
import javax.crypto.KeyGenerator;
|
import javax.crypto.NoSuchPaddingException;
|
import javax.crypto.SecretKey;
|
import javax.crypto.spec.SecretKeySpec;
|
|
|
public class EncryptService {
|
/**
|
* AES加密字符串
|
*
|
* @param content
|
* 需要被加密的字符串
|
* @param password
|
* 加密需要的密码
|
* @return 密文
|
*/
|
public static byte[] encrypt(String content, String password) {
|
try {
|
KeyGenerator kgen = KeyGenerator.getInstance("AES");// 创建AES的Key生产者
|
kgen.init(128, new SecureRandom(password.getBytes()));// 利用用户密码作为随机数初始化出
|
//加密没关系,SecureRandom是生成安全随机数序列,password.getBytes()是种子,只要种子相同,序列就一样,所以解密只要有password就行
|
SecretKey secretKey = kgen.generateKey();// 根据用户密码,生成一个密钥
|
byte[] enCodeFormat = secretKey.getEncoded();// 返回基本编码格式的密钥,如果此密钥不支持编码,则返回
|
SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");// 转换为AES专用密钥
|
Cipher cipher = Cipher.getInstance("AES");// 创建密码器
|
byte[] byteContent = content.getBytes("utf-8");
|
cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化为加密模式的密码器
|
byte[] result = cipher.doFinal(byteContent);// 加密
|
return result;
|
} catch (NoSuchPaddingException e) {
|
e.printStackTrace();
|
} catch (NoSuchAlgorithmException e) {
|
e.printStackTrace();
|
} catch (UnsupportedEncodingException e) {
|
e.printStackTrace();
|
} catch (InvalidKeyException e) {
|
e.printStackTrace();
|
} catch (IllegalBlockSizeException e) {
|
e.printStackTrace();
|
} catch (BadPaddingException e) {
|
e.printStackTrace();
|
}
|
return null;
|
}
|
/**
|
* 解密AES加密过的字符串
|
*
|
* @param content
|
* AES加密过过的内容
|
* @param password
|
* 加密时的密码
|
* @return 明文
|
*/
|
public static byte[] decrypt(byte[] content, String password) {
|
try {
|
KeyGenerator kgen = KeyGenerator.getInstance("AES");// 创建AES的Key生产者
|
kgen.init(128, new SecureRandom(password.getBytes()));
|
SecretKey secretKey = kgen.generateKey();// 根据用户密码,生成一个密钥
|
byte[] enCodeFormat = secretKey.getEncoded();// 返回基本编码格式的密钥
|
SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");// 转换为AES专用密钥
|
Cipher cipher = Cipher.getInstance("AES");// 创建密码器
|
cipher.init(Cipher.DECRYPT_MODE, key);// 初始化为解密模式的密码器
|
byte[] result = cipher.doFinal(content);
|
return result; // 明文
|
} catch (NoSuchAlgorithmException e) {
|
e.printStackTrace();
|
} catch (NoSuchPaddingException e) {
|
e.printStackTrace();
|
} catch (InvalidKeyException e) {
|
e.printStackTrace();
|
} catch (IllegalBlockSizeException e) {
|
e.printStackTrace();
|
} catch (BadPaddingException e) {
|
e.printStackTrace();
|
}
|
return null;
|
}
|
|
}
|