C#加密解密

1、方法一(不可逆加密)

publicstringEncryptPassword(stringPasswordString,stringPasswordFormat)
{
stringencryptPassword=null;
if(PasswordFormat="SHA1"){
encryptPassword=FormsAuthortication.HashPasswordForStoringInConfigFile(PasswordString

,"SHA1");
}
elseif(PasswordFormat="MD5")
{encryptPassword=FormsAuthortication.HashPasswordForStoringInConfigFile(PasswordString

,"MD5");
}
returnencryptPassword;
}


2、方法二(可逆加密)

publicinterfaceIBindesh
{
stringencode(stringstr);
stringdecode(stringstr);
}

publicclassEncryptionDecryption:IBindesh
{
publicstringencode(stringstr)
{
stringhtext="";

for(inti=0;i<str.Length;i++)
{
htext=htext+(char)(str[i]+10-1*2);
}
returnhtext;
}

publicstringdecode(stringstr)
{
stringdtext="";

for(inti=0;i<str.Length;i++)
{
dtext=dtext+(char)(str[i]-10+1*2);
}
returndtext;
}



3、方法三(可逆加密)

conststringKEY_64="VavicApp";//注意了，是8个字符，64位

conststringIV_64="VavicApp";
publicstringEncode(stringdata)
{
byte[]byKey=System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);
byte[]byIV=System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);

DESCryptoServiceProvidercryptoProvider=newDESCryptoServiceProvider();
inti=cryptoProvider.KeySize;
MemoryStreamms=newMemoryStream();
CryptoStreamcst=newCryptoStream(ms,cryptoProvider.CreateEncryptor(byKey,

byIV),CryptoStreamMode.Write);

StreamWritersw=newStreamWriter(cst);
sw.Write(data);
sw.Flush();
cst.FlushFinalBlock();
sw.Flush();
returnConvert.ToBase64String(ms.GetBuffer(),0,(int)ms.Length);

}

publicstringDecode(stringdata)
{
byte[]byKey=System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);
byte[]byIV=System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);

byte[]byEnc;
try
{
byEnc=Convert.FromBase64String(data);
}
catch
{
returnnull;
}

DESCryptoServiceProvidercryptoProvider=newDESCryptoServiceProvider();
MemoryStreamms=newMemoryStream(byEnc);
CryptoStreamcst=newCryptoStream(ms,cryptoProvider.CreateDecryptor(byKey,

byIV),CryptoStreamMode.Read);
StreamReadersr=newStreamReader(cst);
returnsr.ReadToEnd();
}


4、MD5不可逆加密

(32位加密)

publicstringGetMD5(strings,string_input_charset)
{

/**////<summary>
///与ASP兼容的MD5加密算法
///</summary>

MD5md5=newMD5CryptoServiceProvider();
byte[]t=md5.ComputeHash(Encoding.GetEncoding(_input_charset).GetBytes(s));
StringBuildersb=newStringBuilder(32);
for(inti=0;i<t.Length;i++)
{
sb.Append(t[i].ToString("x").PadLeft(2,＇0＇));
}
returnsb.ToString();
}
(16位加密)



publicstaticstringGetMd5Str(stringConvertString)
{
MD5CryptoServiceProvidermd5=newMD5CryptoServiceProvider();
stringt2=

BitConverter.ToString(md5.ComputeHash(UTF8Encoding.Default.GetBytes(ConvertString)),4,8);
t2=t2.Replace("-","");
returnt2;
}


5、加解文本文件

//加密文件
privatestaticvoidEncryptData(StringinName,StringoutName,byte[]desKey,byte[]

desIV)
{
//Createthefilestreamstohandletheinputandoutputfiles.
FileStreamfin=newFileStream(inName,FileMode.Open,FileAccess.Read);
FileStreamfout=newFileStream(outName,FileMode.OpenOrCreate,FileAccess.Write);
fout.SetLength(0);

//Createvariablestohelpwithreadandwrite.
byte[]bin=newbyte[100];//Thisisintermediatestoragefortheencryption.
longrdlen=0;//Thisisthetotalnumberofbyteswritten.
longtotlen=fin.Length;//Thisisthetotallengthoftheinputfile.
intlen;//Thisisthenumberofbytestobewrittenatatime.

DESdes=newDESCryptoServiceProvider();
CryptoStreamencStream=newCryptoStream(fout,des.CreateEncryptor(desKey,desIV),

CryptoStreamMode.Write);

//Readfromtheinputfile,thenencryptandwritetotheoutputfile.
while(rdlen<totlen)
{
len=fin.Read(bin,0,100);
encStream.Write(bin,0,len);
rdlen=rdlen+len;
}

encStream.Close();
fout.Close();
fin.Close();
}

//解密文件
privatestaticvoidDecryptData(StringinName,StringoutName,byte[]desKey,byte[]

desIV)
{
//Createthefilestreamstohandletheinputandoutputfiles.
FileStreamfin=newFileStream(inName,FileMode.Open,FileAccess.Read);
FileStreamfout=newFileStream(outName,FileMode.OpenOrCreate,FileAccess.Write);
fout.SetLength(0);

//Createvariablestohelpwithreadandwrite.
byte[]bin=newbyte[100];//Thisisintermediatestoragefortheencryption.
longrdlen=0;//Thisisthetotalnumberofbyteswritten.
longtotlen=fin.Length;//Thisisthetotallengthoftheinputfile.
intlen;//Thisisthenumberofbytestobewrittenatatime.

DESdes=newDESCryptoServiceProvider();
CryptoStreamencStream=newCryptoStream(fout,des.CreateDecryptor(desKey,desIV),

CryptoStreamMode.Write);

//Readfromtheinputfile,thenencryptandwritetotheoutputfile.
while(rdlen<totlen)
{
len=fin.Read(bin,0,100);
encStream.Write(bin,0,len);
rdlen=rdlen+len;
}

encStream.Close();
fout.Close();
fin.Close();
}


6、

usingSystem;
usingSystem.Collections.Generic;
usingSystem.Text;
usingSystem.Security.Cryptography;
usingSystem.IO;

namespaceComponent
{
publicclassSecurity
{
publicSecurity()
{

}

//默认密钥向量
privatestaticbyte[]Keys={0x12,0x34,0x56,0x78,0x90,0xAB,0xCD,0xEF};
/**//**//**////<summary>
///DES加密字符串
///</summary>
///<paramname="encryptString">待加密的字符串</param>
///<paramname="encryptKey">加密密钥,要求为8位</param>
///<returns>加密成功返回加密后的字符串，失败返回源串</returns>
publicstaticstringEncryptDES(stringencryptString,stringencryptKey)
{
try
{
byte[]rgbKey=Encoding.UTF8.GetBytes(encryptKey.Substring(0,8));
byte[]rgbIV=Keys;
byte[]inputByteArray=Encoding.UTF8.GetBytes(encryptString);
DESCryptoServiceProviderdCSP=newDESCryptoServiceProvider();
MemoryStreammStream=newMemoryStream();
CryptoStreamcStream=newCryptoStream(mStream,dCSP.CreateEncryptor(rgbKey,

rgbIV),CryptoStreamMode.Write);
cStream.Write(inputByteArray,0,inputByteArray.Length);
cStream.FlushFinalBlock();
returnConvert.ToBase64String(mStream.ToArray());
}
catch
{
returnencryptString;
}
}

/**//**//**////<summary>
///DES解密字符串
///</summary>
///<paramname="decryptString">待解密的字符串</param>
///<paramname="decryptKey">解密密钥,要求为8位,和加密密钥相同</param>
///<returns>解密成功返回解密后的字符串，失败返源串</returns>
publicstaticstringDecryptDES(stringdecryptString,stringdecryptKey)
{
try
{
byte[]rgbKey=Encoding.UTF8.GetBytes(decryptKey);
byte[]rgbIV=Keys;
byte[]inputByteArray=Convert.FromBase64String(decryptString);
DESCryptoServiceProviderDCSP=newDESCryptoServiceProvider();
MemoryStreammStream=newMemoryStream();
CryptoStreamcStream=newCryptoStream(mStream,DCSP.CreateDecryptor(rgbKey,

rgbIV),CryptoStreamMode.Write);
cStream.Write(inputByteArray,0,inputByteArray.Length);
cStream.FlushFinalBlock();
returnEncoding.UTF8.GetString(mStream.ToArray());
}
catch
{
returndecryptString;
}
}


}
}