aes c# java-凯发ag旗舰厅登录网址下载

///

///用种子获取密钥字节///

/// 密钥种子

/// 编码格式

/// 密钥长度(一般为16，不清楚时不要随意动)

///

public static byte[] getkeybyseed(string strkey, encoding encoding, int nlen = 16)

{byte[] byseed =encoding.getbytes(strkey);byte[] bykeyarray = null;using (var st = newsha1cryptoserviceprovider())

{using (var nd = newsha1cryptoserviceprovider())

{var rd =nd.computehash(st.computehash(byseed));

bykeyarray=rd.take(nlen).toarray();

}

}returnbykeyarray;

}///

///加密 参数：string///

/// 加密内容

/// 密钥字节数组

/// 向量(注意目前只研究支持16位长度)

/// 编码方式

/// string：密文

public static string encrypt(string strcon, byte[] bytekey, encoding encoding)

{try{if (string.isnullorwhitespace(strcon))

{return null;

}byte[] bycon =encoding.getbytes(strcon);var rm = newrijndaelmanaged

{

key=bytekey,

mode=ciphermode.ecb,

padding=paddingmode.pkcs7

};

icryptotransform ctransform=rm.createencryptor();byte[] resultarray = ctransform.transformfinalblock(bycon, 0, bycon.length);returnprogram.bytearraytohexstring(resultarray);

}catch{return "";

}

}public static string decrypt(string strcon, byte[] bytekey,encoding encoding)

{try{if (string.isnullorwhitespace(strcon))

{return null;

}byte[] bycon =hexstrtobyte(strcon);var rm = newrijndaelmanaged

{

key=bytekey,

mode=ciphermode.ecb,

padding=paddingmode.pkcs7

};

icryptotransform ctransform=rm.createdecryptor();byte[] resultarray = ctransform.transformfinalblock(bycon, 0, bycon.length);returnencoding.getstring(resultarray);

}catch(exception ex)

{return "";

}

}///

///

///

///

///

public static byte[] hexstrtobyte(stringhexstring)

{

hexstring= hexstring.replace(" ", "");if ((hexstring.length % 2) != 0)

hexstring = " ";byte[] returnbytes = new byte[hexstring.length / 2];for (int i = 0; i < returnbytes.length; i )

returnbytes[i]= convert.tobyte(hexstring.substring(i * 2, 2), 16);returnreturnbytes;

}///

///转化为16进制///

///

///

public static string bytearraytohexstring(byte[] data)

{

stringbuilder sb= new stringbuilder(data.length * 3);foreach (byte b indata)

{

sb.append(convert.tostring(b,16).padleft(2, '0'));

}returnsb.tostring().toupper();

}

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