package com.lf.server.helper;
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import javax.crypto.Cipher;
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import javax.crypto.KeyGenerator;
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import javax.crypto.spec.SecretKeySpec;
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import java.util.Base64;
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/**
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* AES加密帮助
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* @author WWW
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*/
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@SuppressWarnings("restriction")
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public class AesHelper {
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/**
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* 密钥长度必须是16
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*/
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private static final String DEFAULT_KEY = "A#s_lF_sErve_k.y";
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private static final String KEY_ALGORITHM = "AES";
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/**
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* 算法
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*/
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private static final String ALGORITHMSTR = "AES/ECB/PKCS5Padding";
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/**
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* aes解密
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*
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* @param encrypt 内容
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* @return
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* @throws Exception
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*/
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public static String decrypt(String encrypt) throws Exception {
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return decrypt(encrypt, DEFAULT_KEY);
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}
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/**
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* aes加密
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*
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* @param content 内容
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* @return
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* @throws Exception
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*/
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public static String encrypt(String content) throws Exception {
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return encrypt(content, DEFAULT_KEY);
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}
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/**
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* base 64 encode
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*
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* @param bytes 待编码的byte[]
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* @return 编码后的base64 code
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*/
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private static String base64Encode(byte[] bytes) {
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return Base64.getEncoder().encodeToString(bytes);
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}
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/**
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* base 64 decode
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*
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* @param base64Code 待解码的base64 code
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* @return 解码后的byte[]
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* @throws Exception
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*/
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private static byte[] base64Decode(String base64Code) {
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return StringHelper.isEmpty(base64Code) ? null : Base64.getDecoder().decode(base64Code);
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}
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/**
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* AES加密
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*
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* @param content 待加密的内容
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* @param encryptKey 加密密钥
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* @return 加密后的byte[]
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* @throws Exception
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*/
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private static byte[] aesEncryptToBytes(String content, String encryptKey) throws Exception {
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// KeyGenerator kGen = KeyGenerator.getInstance(KEY_ALGORITHM)
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// kGen.init(128)
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Cipher cipher = Cipher.getInstance(ALGORITHMSTR);
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cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(encryptKey.getBytes(), KEY_ALGORITHM));
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return cipher.doFinal(content.getBytes("utf-8"));
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}
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/**
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* AES加密为base 64 code
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*
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* @param content 待加密的内容
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* @param encryptKey 加密密钥
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* @return 加密后的base 64 code
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* @throws Exception
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*/
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public static String encrypt(String content, String encryptKey) throws Exception {
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return base64Encode(aesEncryptToBytes(content, encryptKey));
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}
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/**
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* 将base 64 code AES解密
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*
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* @param encryptStr 待解密的base 64 code
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* @param decryptKey 解密密钥
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* @return 解密后的string
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* @throws Exception
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*/
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public static String decrypt(String encryptStr, String decryptKey) throws Exception {
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return StringHelper.isEmpty(encryptStr) ? null : aesDecryptByBytes(base64Decode(encryptStr), decryptKey);
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}
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/**
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* AES解密
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*
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* @param encryptBytes 待解密的byte[]
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* @param decryptKey 解密密钥
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* @return 解密后的String
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* @throws Exception
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*/
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private static String aesDecryptByBytes(byte[] encryptBytes, String decryptKey) throws Exception {
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// KeyGenerator kGen = KeyGenerator.getInstance(KEY_ALGORITHM)
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// kGen.init(128)
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Cipher cipher = Cipher.getInstance(ALGORITHMSTR);
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cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(decryptKey.getBytes(), KEY_ALGORITHM));
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byte[] decryptBytes = cipher.doFinal(encryptBytes);
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return new String(decryptBytes);
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}
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}
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