ASP.NET加密解密算法分享
#regionDES加密解密
///<summary>
///DES加密
///</summary>
///<paramname="strSource">待加密字串</param>
///<paramname="key">32位Key值</param>
///<returns>加密后的字符串</returns>
publicstringDESEncrypt(stringstrSource)
{
returnDESEncrypt(strSource,DESKey);
}
publicstringDESEncrypt(stringstrSource,byte[]key)
{
SymmetricAlgorithmsa=Rijndael.Create();
sa.Key=key;
sa.Mode=CipherMode.ECB;
sa.Padding=PaddingMode.Zeros;
MemoryStreamms=newMemoryStream();
CryptoStreamcs=newCryptoStream(ms,sa.CreateEncryptor(),CryptoStreamMode.Write);
byte[]byt=Encoding.Unicode.GetBytes(strSource);
cs.Write(byt,0,byt.Length);
cs.FlushFinalBlock();
cs.Close();
returnConvert.ToBase64String(ms.ToArray());
}
///<summary>
///DES解密
///</summary>
///<paramname="strSource">待解密的字串</param>
///<paramname="key">32位Key值</param>
///<returns>解密后的字符串</returns>
publicstringDESDecrypt(stringstrSource)
{
returnDESDecrypt(strSource,DESKey);
}
publicstringDESDecrypt(stringstrSource,byte[]key)
{
SymmetricAlgorithmsa=Rijndael.Create();
sa.Key=key;
sa.Mode=CipherMode.ECB;
sa.Padding=PaddingMode.Zeros;
ICryptoTransformct=sa.CreateDecryptor();
byte[]byt=Convert.FromBase64String(strSource);
MemoryStreamms=newMemoryStream(byt);
CryptoStreamcs=newCryptoStream(ms,ct,CryptoStreamMode.Read);
StreamReadersr=newStreamReader(cs,Encoding.Unicode);
returnsr.ReadToEnd();
}
#endregion
#region一个用hash实现的加密解密方法
///<summary>
///加密
///</summary>
///<paramname="src"></param>
///<returns></returns>
publicstaticstringEncryptStrByHash(stringsrc)
{
if(src.Length==0)
{
return"";
}
byte[]HaKey=System.Text.Encoding.ASCII.GetBytes((src+"Test").ToCharArray());
byte[]HaData=newbyte[20];
HMACSHA1Hmac=newHMACSHA1(HaKey);
CryptoStreamcs=newCryptoStream(Stream.Null,Hmac,CryptoStreamMode.Write);
try
{
cs.Write(HaData,0,HaData.Length);
}
finally
{
cs.Close();
}
stringHaResult=System.Convert.ToBase64String(Hmac.Hash).Substring(0,16);
byte[]RiKey=System.Text.Encoding.ASCII.GetBytes(HaResult.ToCharArray());
byte[]RiDataBuf=System.Text.Encoding.ASCII.GetBytes(src.ToCharArray());
byte[]EncodedBytes={};
MemoryStreamms=newMemoryStream();
RijndaelManagedrv=newRijndaelManaged();
cs=newCryptoStream(ms,rv.CreateEncryptor(RiKey,RiKey),CryptoStreamMode.Write);
try
{
cs.Write(RiDataBuf,0,RiDataBuf.Length);
cs.FlushFinalBlock();
EncodedBytes=ms.ToArray();
}
finally
{
ms.Close();
cs.Close();
}
returnHaResult+System.Convert.ToBase64String(EncodedBytes);
}
///<summary>
///解密
///</summary>
///<paramname="src"></param>
///<returns></returns>
publicstaticstringDecrypStrByHash(stringsrc)
{
if(src.Length<40)return"";
byte[]SrcBytes=System.Convert.FromBase64String(src.Substring(16));
byte[]RiKey=System.Text.Encoding.ASCII.GetBytes(src.Substring(0,16).ToCharArray());
byte[]InitialText=newbyte[SrcBytes.Length];
RijndaelManagedrv=newRijndaelManaged();
MemoryStreamms=newMemoryStream(SrcBytes);
CryptoStreamcs=newCryptoStream(ms,rv.CreateDecryptor(RiKey,RiKey),CryptoStreamMode.Read);
try
{
cs.Read(InitialText,0,InitialText.Length);
}
finally
{
ms.Close();
cs.Close();
}
System.Text.StringBuilderResult=newSystem.Text.StringBuilder();
for(inti=0;i<InitialText.Length;++i)if(InitialText[i]>0)Result.Append((char)InitialText[i]);
returnResult.ToString();
}
///<summary>
///对加密后的密文重新编码,如果密文长>16,则去掉前16个字符,如果长度小于16,返回空字符串
///</summary>
///<paramname="s"></param>
///<returns></returns>
publicstringReEncryptStrByHash(strings)
{
stringe=Encrypt.EncryptStrByHash(s);
return((e.Length>16)?e.Substring(16):"");
}
#endregion
#regionMd5加密,生成16位或32位,生成的密文都是大写
publicstaticstringMd5To16(stringstr)
{
MD5CryptoServiceProvidermd5=newMD5CryptoServiceProvider();
stringt2=BitConverter.ToString(md5.ComputeHash(UTF8Encoding.Default.GetBytes(str)),4,8);
t2=t2.Replace("-","");
returnt2;
}
////<summary>
///MD532位加密
///</summary>
///<paramname="str"></param>
///<returns></returns>
publicstaticstringMd5To32(stringstr)
{
stringpwd="";
MD5md5=MD5.Create();
byte[]s=md5.ComputeHash(Encoding.UTF8.GetBytes(str));
for(inti=0;i<s.Length;i++)
{
pwd=pwd+s[i].ToString("X");
}
returnpwd;
}
#endregion
#region3DES加密解密
publicstringEncrypt3DES(stringstr)
{
//密钥
stringsKey="wyw308";
////矢量,可为空
stringsIV="scf521";
////构造对称算法
SymmetricAlgorithmmCSP=newTripleDESCryptoServiceProvider();
ICryptoTransformct;
MemoryStreamms;
CryptoStreamcs;
byte[]byt;
mCSP.Key=Convert.FromBase64String(sKey);
mCSP.IV=Convert.FromBase64String(sIV);
mCSP.Mode=System.Security.Cryptography.CipherMode.ECB;
mCSP.Padding=System.Security.Cryptography.PaddingMode.PKCS7;
ct=mCSP.CreateEncryptor(mCSP.Key,mCSP.IV);
byt=Encoding.UTF8.GetBytes(str);
ms=newMemoryStream();
cs=newCryptoStream(ms,ct,CryptoStreamMode.Write);
cs.Write(byt,0,byt.Length);
cs.FlushFinalBlock();
cs.Close();
returnConvert.ToBase64String(ms.ToArray());
}
///<summary>
///带指定密钥和矢量的3DES加密
///</summary>
///<paramname="str"></param>
///<paramname="sKey"></param>
///<paramname="sIV"></param>
///<returns></returns>
publicstringEncrypt3DES(stringstr,stringsKey,stringsIV)
{
SymmetricAlgorithmmCSP=newTripleDESCryptoServiceProvider();
ICryptoTransformct;
MemoryStreamms;
CryptoStreamcs;
byte[]byt;
mCSP.Key=Convert.FromBase64String(sKey);
mCSP.IV=Convert.FromBase64String(sIV);
mCSP.Mode=System.Security.Cryptography.CipherMode.ECB;
mCSP.Padding=System.Security.Cryptography.PaddingMode.PKCS7;
ct=mCSP.CreateEncryptor(mCSP.Key,mCSP.IV);
byt=Encoding.UTF8.GetBytes(str);
ms=newMemoryStream();
cs=newCryptoStream(ms,ct,CryptoStreamMode.Write);
cs.Write(byt,0,byt.Length);
cs.FlushFinalBlock();
cs.Close();
returnConvert.ToBase64String(ms.ToArray());
}
//解密
publicstringDecrypt3DES(stringValue)
{
stringsKey="wyw308";
stringsIV="scf521";
SymmetricAlgorithmmCSP=newTripleDESCryptoServiceProvider();
ICryptoTransformct;
MemoryStreamms;
CryptoStreamcs;
byte[]byt;
mCSP.Key=Convert.FromBase64String(sKey);
mCSP.IV=Convert.FromBase64String(sIV);
mCSP.Mode=System.Security.Cryptography.CipherMode.ECB;
mCSP.Padding=System.Security.Cryptography.PaddingMode.PKCS7;
ct=mCSP.CreateDecryptor(mCSP.Key,mCSP.IV);
byt=Convert.FromBase64String(Value);
ms=newMemoryStream();
cs=newCryptoStream(ms,ct,CryptoStreamMode.Write);
cs.Write(byt,0,byt.Length);
cs.FlushFinalBlock();
cs.Close();
returnEncoding.UTF8.GetString(ms.ToArray());
}
///<summary>
///带指定密钥和矢量的3DES解密
///</summary>
///<paramname="Value"></param>
///<paramname="sKey"></param>
///<paramname="sIV"></param>
///<returns></returns>
publicstringDecrypt3DES(stringstr,stringsKey,stringsIV)
{
SymmetricAlgorithmmCSP=newTripleDESCryptoServiceProvider();
ICryptoTransformct;
MemoryStreamms;
CryptoStreamcs;
byte[]byt;
mCSP.Key=Convert.FromBase64String(sKey);
mCSP.IV=Convert.FromBase64String(sIV);
mCSP.Mode=System.Security.Cryptography.CipherMode.ECB;
mCSP.Padding=System.Security.Cryptography.PaddingMode.PKCS7;
ct=mCSP.CreateDecryptor(mCSP.Key,mCSP.IV);
byt=Convert.FromBase64String(str);
ms=newMemoryStream();
cs=newCryptoStream(ms,ct,CryptoStreamMode.Write);
cs.Write(byt,0,byt.Length);
cs.FlushFinalBlock();
cs.Close();
returnEncoding.UTF8.GetString(ms.ToArray());
}
#endregion
#region一个简单的加密解密方法,只支持英文
publicstaticstringEnCryptEnStr(stringstr)//倒序加1加密
{
byte[]by=newbyte[str.Length];
for(inti=0;
i<=str.Length-1;
i++)
{
by[i]=(byte)((byte)str[i]+1);
}
str="";
for(inti=by.Length-1;
i>=0;
i--)
{
str+=((char)by[i]).ToString();
}
returnstr;
}
publicstaticstringDeCryptEnStr(stringstr)//顺序减1解码
{
byte[]by=newbyte[str.Length];
for(inti=0;
i<=str.Length-1;
i++)
{
by[i]=(byte)((byte)str[i]-1);
}
str="";
for(inti=by.Length-1;
i>=0;
i--)
{
str+=((char)by[i]).ToString();
}
returnstr;
}
#endregion
#region一个简单的加密解密方法,在上一个的基础上支持中文
publicstaticstringEnCryptCnStr(stringstr)
{
stringhtext="";//blanktext
for(inti=0;i<str.Length;i++)
{
htext=htext+(char)(str[i]+10-1*2);
}
returnhtext;
}
publicstaticstringDeCryptCnStr(stringstr)
{
stringdtext="";
for(inti=0;i<str.Length;i++)
{
dtext=dtext+(char)(str[i]-10+1*2);
}
returndtext;
}
#endregion
#regionUrl地址编码解码
///<summary>
///编码Url地址
///</summary>
///<paramname="url"></param>
///<returns></returns>
publicstaticstringUrlEncode(stringurl)
{
byte[]mByte=null;
mByte=System.Text.Encoding.GetEncoding("GB2312").GetBytes(url);
returnSystem.Web.HttpUtility.UrlEncode(mByte);
}
///<summary>
///解码Url地址
///</summary>
///<paramname="url"></param>
///<returns></returns>
publicstaticstringUrlDecode(stringurl)
{
returnHttpUtility.UrlDecode(url,System.Text.Encoding.GetEncoding("GB2312"));
}
#endregion
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