C 可逆加密類

using system;

using system.collections.generic;

using system.linq;

using system.text;

using system.io;

using system.security.cryptography;

namespace fromargs

{class symmetricmethod

{private symmetricalgorithm mobjcryptoservice;

private string key;

///

/// 對稱加密類的建構函式

///

public symmetricmethod()

mobjcryptoservice = new rijndaelmanaged();

key = "guz(%&hj7x89h$yubi0456ftmat5&fvhufcy76*h%(hilj$lhj!y6&(*jkp87jh7";

///

/// 獲得金鑰

///

/// 金鑰

private byte getlegalkey()

string stemp = key;

mobjcryptoservice.generatekey();

byte byttemp = mobjcryptoservice.key;

int keylength = byttemp.length;

if (stemp.length > keylength)

stemp = stemp.substring(0, keylength);

else if (stemp.length < keylength)

stemp = stemp.padright(keylength, ' ');

return asciiencoding.ascii.getbytes(stemp);

///

/// 獲得初始向量iv

///

/// 初試向量iv

private byte getlegaliv()

string stemp = "e4ghj*ghg7!rnifb&95guy86gfghub#er57hbh(u%g6hj($jhwk7&!hg4ui%$hjk";

mobjcryptoservice.generateiv();

byte byttemp = mobjcryptoservice.iv;

int ivlength = byttemp.length;

if (stemp.length > ivlength)

stemp = stemp.substring(0, ivlength);

else if (stemp.length < ivlength)

stemp = stemp.padright(ivlength, ' ');

return asciiencoding.ascii.getbytes(stemp);

///

/// 加密方法

///

/// 待加密的串

/// 經過加密的串

public string encrypto(string source)

byte bytin = utf8encoding.utf8.getbytes(source);

memorystream ms = new memorystream();

mobjcryptoservice.key = getlegalkey();

mobjcryptoservice.iv = getlegaliv();

icryptotransform encrypto = mobjcryptoservice.createencryptor();

cryptostream cs = new cryptostream(ms, encrypto, cryptostreammode.write);

cs.write(bytin, 0, bytin.length);

cs.flushfinalblock();

ms.close();

byte bytout = ms.toarray();

return convert.tobase64string(bytout);

///

/// 解密方法

///

/// 待解密的串

/// 經過解密的串

public string decrypto(string source)

byte bytin = convert.frombase64string(source);

memorystream ms = new memorystream(bytin, 0, bytin.length);

mobjcryptoservice.key = getlegalkey();

mobjcryptoservice.iv = getlegaliv();

icryptotransform encrypto = mobjcryptoservice.createdecryptor();

cryptostream cs = new cryptostream(ms, encrypto, cryptostreammode.read);

streamreader sr = new streamreader(cs);

return sr.readtoend();

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