對稱加密 解密

///

///加密
///    public
static
class
encrypting
//////
使用對稱演算法加密
///        ///
//////
public
static
string symmetricencrypts(string
str)
;//如需指定加密演算法，可在create()引數中指定字串
//create()方法中的引數可以是：des、rc2 system、rijndael、tripledes 
//採用不同的實現類對iv向量的要求不一樣(可以用generateiv()方法生成)，無引數表示用rijndael
algorithm = symmetricalgorithm.create();//
產生一種加密演算法
mstarget = new
memorystream();
//定義將資料流鏈結到加密轉換的流。
encstream = new
cryptostream(mstarget, algorithm.createencryptor(convert.frombase64string(getencryptkey()), kv), cryptostreammode.write);
encstream.write(inputdata, 
0, inputdata.length);
encstream.flushfinalblock();
result =convert.tobase64string(mstarget.toarray());
}catch
(exception)
finally
return
result;
}//////
使用對稱演算法解密
///        ///
//////
public
static
string symmectricdecrypts(string
encryptstr)
;byte encryptdata =convert.frombase64string(encryptstr);
algorithm =symmetricalgorithm.create();
mstarget = new
memorystream();
decstream = new
cryptostream(mstarget, algorithm.createdecryptor(convert.frombase64string(getencryptkey()), kv), cryptostreammode.write);
decstream.write(encryptdata, 
0, encryptdata.length);
decstream.flushfinalblock();
result =system.text.encoding.default.getstring(mstarget.toarray());
}catch
(exception)
finally
return
result;
}#endregion
}

對稱加密解密

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