aes是常用的對稱加密技術，比des有更高的安全性。
在寫cp-abe系統的時間使用aes加密密文檔案，abe加密了乙個element（jpbc庫），屬於常見的加密體制。
下面**的aes，乙個是以檔案流的形式加密檔案，乙個是直接加密字串
public class aes
destfile.createnewfile();
inputstream in = new fileinputstream(sourcefile);
outputstream out = new fileoutputstream(destfile);
// key k = tokey(base64.decode(key));
//byte raw = k.getencoded();
keygenerator kgen = keygenerator.getinstance("aes");
kgen.init(128, new securerandom(m.tobytes()));
secretkey secretkey = kgen.generatekey();
byte encodeformat = secretkey.getencoded();
secretkeyspec key1 = new secretkeyspec(encodeformat, "aes");
cipher cipher = cipher.getinstance("aes");// 建立密碼器
//byte bytecontent = content.getbytes("utf-8");
cipher.init(cipher.encrypt_mode, key1);// 初始化
//byte result = cipher.dofinal(bytecontent);
//secretkeyspec secretkeyspec = new secretkeyspec(key,"aes");
//cipher cipher = cipher.getinstance("aes");
cipher.init(cipher.encrypt_mode, secretkey);
cipherinputstream cin = new cipherinputstream(in, cipher);
byte cache = new byte[cache_size];
int nread = 0;
while ((nread = cin.read(cache)) != -1)
out.close();
cin.close();
in.close();}}
/***
* 解密
* *
* @param data
* @param key
* @return
* @throws exception
*//**
* * 檔案解密
* *
* @param key
* @param sourcefilepath
* @param destfilepath
* @throws exception
*/public static void decryptfile(element m, string sourcefilepath, string destfilepath) throws exception
destfile.createnewfile();
fileinputstream in = new fileinputstream(sourcefile);
fileoutputstream out = new fileoutputstream(destfile);
//key k = tokey(base64.decode(key));
// byte raw = k.getencoded();
keygenerator kgen = keygenerator.getinstance("aes");
kgen.init(128, new securerandom(m.tobytes()));
secretkey secretkey = kgen.generatekey();
byte encodeformat = secretkey.getencoded();
secretkeyspec key1 = new secretkeyspec(encodeformat, "aes");
cipher cipher = cipher.getinstance("aes");// 建立密碼器
cipher.init(cipher.decrypt_mode, key1);// 初始化
//byte result = cipher.dofinal(content);
//secretkeyspec secretkeyspec = new secretkeyspec(raw, "aes");
//cipher cipher = cipher.getinstance("aes");
secretkeyspec);
cipheroutputstream cout = new cipheroutputstream(out, cipher);
byte cache = new byte[cache_size];
int nread = 0;
while ((nread = in.read(cache)) != -1)
cout.close();
out.close();
in.close();}}
public static byte encrypt(string content, element m) catch (nosuchalgorithmexception e) catch (nosuchpaddingexception e) catch (invalidkeyexception e) catch (illegalblocksizeexception e) catch (badpaddingexception e)
return null;
}public static byte decrypt(byte content, element m) catch (nosuchalgorithmexception e) catch (nosuchpaddingexception e) catch (invalidkeyexception e) catch (illegalblocksizeexception e) catch (badpaddingexception e)
return null;
}**如上，看到一些部落格說aes加密時間和解密時間相比應該是差不多的，但是博主測試aes加密時間為300ms作用，解密時間卻只有20ms，感覺可能是jar包的問題。
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