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package?com.mk.api.util;

import?java.security.Key;
import?java.security.MessageDigest;
import?java.util.Arrays;

import?javax.crypto.Cipher;
import?javax.crypto.spec.SecretKeySpec;
import?javax.xml.bind.DatatypeConverter;

/**
?*?AES?加密
?*/
public?class?AES?{

???private?static?final?String?AESTYPE?=?"AES";
???private?static?final?String?KEY?=?"Z8LSq0wWwB5v+6YJzurcP463H3F12iZh74fDj4S74oUH4EONkiKb2FmiWUbtFh97GG/c/lbDE47mvw6j94yXxKHOpoqu6zpLKMKPcOoSppcVWb2q34qENBJkudXUh4MWcreondLmLL2UyydtFKuU9Sa5VgY/CzGaVGJABK2ZR94=";
???
???/**
????*?加密
????*?@param?content
????*?@return
????*/
???public?static?String?encrypt(String?str)?{
??????try?{
?????????Key?key?=?generateKey();
?????????Cipher?c?=?Cipher.getInstance(AESTYPE);
?????????c.init(Cipher.ENCRYPT_MODE,?key);
?????????byte[]?encVal?=?c.doFinal(str.getBytes());
?????????String?encryptedValue?=?DatatypeConverter.printBase64Binary(encVal);
?????????return?encryptedValue;
??????}?catch?(Exception?e)?{
?????????e.printStackTrace();
??????}
??????return?null;
???}


???/**
????*?解密
????*?@param?content
????*?@return
????*/
???public?static?String?decrypt(String?str)?{
??????try?{
?????????Key?key?=?generateKey();
?????????Cipher?c?=?Cipher.getInstance(AESTYPE);
?????????c.init(Cipher.DECRYPT_MODE,?key);
?????????byte[]?decordedValue?=?DatatypeConverter.parseBase64Binary(str);
?????????byte[]?decValue?=?c.doFinal(decordedValue);
?????????String?decryptedValue?=?new?String(decValue);
?????????return?decryptedValue;
??????}?catch?(Exception?e)?{
?????????e.printStackTrace();
??????}
??????return?null;
???}

???private?static?Key?generateKey()?throws?Exception?{
??????byte[]?keyValue?=?KEY.getBytes("UTF-8");
??????MessageDigest?sha?=?MessageDigest.getInstance("SHA-1");
??????keyValue?=?sha.digest(keyValue);
??????keyValue?=?Arrays.copyOf(keyValue,?16);
??????Key?key?=?new?SecretKeySpec(keyValue,?AESTYPE);
??????return?key;
???}
???

}

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