asp.net加密算法

方法一：

//须添加对System.Web的引用

usingSystem.Web.Security;

...

/// <summary>

/// SHA1加密字符串

/// </summary>

/// <param name="source">源字符串</param>

/// <returns>加密后的字符串</returns>

publicstringSHA1(stringsource)

{

returnFormsAuthentication.HashPasswordForStoringInConfigFile(source,"SHA1");

}

/// <summary>

/// MD5加密字符串

/// </summary>

/// <param name="source">源字符串</param>

/// <returns>加密后的字符串</returns>

publicstringMD5(stringsource)

{

returnFormsAuthentication.HashPasswordForStoringInConfigFile(source,"MD5");;

}

方法二(可逆加密解密)：

usingSystem.Security.Cryptography;

...

publicstringEncode(stringdata)

{

byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);

byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);

DESCryptoServiceProvider cryptoProvider =newDESCryptoServiceProvider();

inti = cryptoProvider.KeySize;

MemoryStream ms =newMemoryStream();

CryptoStream cst =newCryptoStream(ms, cryptoProvider.CreateEncryptor(byKey, byIV), CryptoStreamMode.Write);

StreamWriter sw =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;

}

DESCryptoServiceProvider cryptoProvider =newDESCryptoServiceProvider();

MemoryStream ms =newMemoryStream(byEnc);

CryptoStream cst =newCryptoStream(ms, cryptoProvider.CreateDecryptor(byKey, byIV), CryptoStreamMode.Read);

StreamReader sr =newStreamReader(cst);

returnsr.ReadToEnd();

}

方法三(MD5不可逆)：

usingSystem.Security.Cryptography;

...

//MD5不可逆加密

//32位加密

publicstringGetMD5_32(strings,string_input_charset)

{

MD5 md5 =newMD5CryptoServiceProvider();

byte[] t = md5.ComputeHash(Encoding.GetEncoding(_input_charset).GetBytes(s));

StringBuilder sb =newStringBuilder(32);

for(inti = 0; i < t.Length; i++)

{

sb.Append(t[i].ToString("x").PadLeft(2,'0'));

}

returnsb.ToString();

}

//16位加密

publicstaticstringGetMd5_16(stringConvertString)

{

MD5CryptoServiceProvider md5 =newMD5CryptoServiceProvider();

stringt2 = BitConverter.ToString(md5.ComputeHash(UTF8Encoding.Default.GetBytes(ConvertString)), 4, 8);

t2 = t2.Replace("-","");

returnt2;

}

方法四(对称加密)：

usingSystem.IO;

usingSystem.Security.Cryptography;

...

privateSymmetricAlgorithm mobjCryptoService;

privatestringKey;

/// <summary>

/// 对称加密类的构造函数

/// </summary>

publicSymmetricMethod()

{

mobjCryptoService =newRijndaelManaged();

Key ="Guz(%&hj7x89H$yuBI0456FtmaT5&fvHUFCy76*h%(HilJ$lhj!y6&(*jkP87jH7";

}

/// <summary>

/// 获得密钥

/// </summary>

/// <returns>密钥</returns>

privatebyte[] GetLegalKey()

{

stringsTemp = Key;

mobjCryptoService.GenerateKey();

byte[] bytTemp = mobjCryptoService.Key;

intKeyLength = bytTemp.Length;

if(sTemp.Length > KeyLength)

sTemp = sTemp.Substring(0, KeyLength);

elseif(sTemp.Length < KeyLength)

sTemp = sTemp.PadRight(KeyLength,' ');

returnASCIIEncoding.ASCII.GetBytes(sTemp);

}

/// <summary>

/// 获得初始向量IV

/// </summary>

/// <returns>初试向量IV</returns>

privatebyte[] GetLegalIV()

{

stringsTemp ="E4ghj*Ghg7!rNIfb&95GUY86GfghUb#er57HBh(u%g6HJ($jhWk7&!hg4ui%$hjk";

mobjCryptoService.GenerateIV();

byte[] bytTemp = mobjCryptoService.IV;

intIVLength = bytTemp.Length;

if(sTemp.Length > IVLength)

sTemp = sTemp.Substring(0, IVLength);

elseif(sTemp.Length < IVLength)

sTemp = sTemp.PadRight(IVLength,' ');

returnASCIIEncoding.ASCII.GetBytes(sTemp);

}

/// <summary>

/// 加密方法

/// </summary>

/// <param name="Source">待加密的串</param>

/// <returns>经过加密的串</returns>

publicstringEncrypto(stringSource)

{

byte[] bytIn = UTF8Encoding.UTF8.GetBytes(Source);

MemoryStream ms =newMemoryStream();

mobjCryptoService.Key = GetLegalKey();

mobjCryptoService.IV = GetLegalIV();

ICryptoTransform encrypto = mobjCryptoService.CreateEncryptor();

CryptoStream cs =newCryptoStream(ms, encrypto, CryptoStreamMode.Write);

cs.Write(bytIn, 0, bytIn.Length);

cs.FlushFinalBlock();

ms.Close();

byte[] bytOut = ms.ToArray();

returnConvert.ToBase64String(bytOut);

}

/// <summary>

/// 解密方法

/// </summary>

/// <param name="Source">待解密的串</param>

/// <returns>经过解密的串</returns>

publicstringDecrypto(stringSource)

{

byte[] bytIn = Convert.FromBase64String(Source);

MemoryStream ms =newMemoryStream(bytIn, 0, bytIn.Length);

mobjCryptoService.Key = GetLegalKey();

mobjCryptoService.IV = GetLegalIV();

ICryptoTransform encrypto = mobjCryptoService.CreateDecryptor();

CryptoStream cs =newCryptoStream(ms, encrypto, CryptoStreamMode.Read);

StreamReader sr =newStreamReader(cs);

returnsr.ReadToEnd();

}

方法五：

usingSystem.IO;

usingSystem.Security.Cryptography;

usingSystem.Text;

...

//默认密钥向量

privatestaticbyte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };

/// <summary>

/// DES加密字符串

/// </summary>

/// <param name="encryptString">待加密的字符串</param>

/// <param name="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);

DESCryptoServiceProvider dCSP =newDESCryptoServiceProvider();

MemoryStream mStream =newMemoryStream();

CryptoStream cStream =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>

/// <param name="decryptString">待解密的字符串</param>

/// <param name="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);

DESCryptoServiceProvider DCSP =newDESCryptoServiceProvider();

MemoryStream mStream =newMemoryStream();

CryptoStream cStream =newCryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);

cStream.Write(inputByteArray, 0, inputByteArray.Length);

cStream.FlushFinalBlock();

returnEncoding.UTF8.GetString(mStream.ToArray());

}

catch

{

returndecryptString;

}

}

方法六(文件加密)：

usingSystem.IO;

usingSystem.Security.Cryptography;

usingSystem.Text;

...

//加密文件

privatestaticvoidEncryptData(String inName, String outName,byte[] desKey,byte[] desIV)

{

//Create the file streams to handle the input and output files.

FileStream fin =newFileStream(inName, FileMode.Open, FileAccess.Read);

FileStream fout =newFileStream(outName, FileMode.OpenOrCreate, FileAccess.Write);

fout.SetLength(0);

//Create variables to help with read and write.

byte[] bin =newbyte[100];//This is intermediate storage for the encryption.

longrdlen = 0;//This is the total number of bytes written.

longtotlen = fin.Length;//This is the total length of the input file.

intlen;//This is the number of bytes to be written at a time.

DES des =newDESCryptoServiceProvider();

CryptoStream encStream =newCryptoStream(fout, des.CreateEncryptor(desKey, desIV), CryptoStreamMode.Write);

//Read from the input file, then encrypt and write to the output file.

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(String inName, String outName,byte[] desKey,byte[] desIV)

{

//Create the file streams to handle the input and output files.

FileStream fin =newFileStream(inName, FileMode.Open, FileAccess.Read);

FileStream fout =newFileStream(outName, FileMode.OpenOrCreate, FileAccess.Write);

fout.SetLength(0);

//Create variables to help with read and write.

byte[] bin =newbyte[100];//This is intermediate storage for the encryption.

longrdlen = 0;//This is the total number of bytes written.

longtotlen = fin.Length;//This is the total length of the input file.

intlen;//This is the number of bytes to be written at a time.

DES des =newDESCryptoServiceProvider();

CryptoStream encStream =newCryptoStream(fout, des.CreateDecryptor(desKey, desIV), CryptoStreamMode.Write);

//Read from the input file, then encrypt and write to the output file.

while(rdlen < totlen)

{

len = fin.Read(bin, 0, 100);

encStream.Write(bin, 0, len);

rdlen = rdlen + len;

}

encStream.Close();

fout.Close();

fin.Close();

}

usingSystem;

usingSystem.Security.Cryptography;//这个是处理文字编码的前提

usingSystem.Text;

usingSystem.IO;

/// <summary>

/// DES加密方法

/// </summary>

/// <param name="strPlain">明文</param>

/// <param name="strDESKey">密钥</param>

/// <param name="strDESIV">向量</param>

/// <returns>密文</returns>

publicstringDESEncrypt(stringstrPlain,stringstrDESKey,stringstrDESIV)

{

//把密钥转换成字节数组

byte[] bytesDESKey=ASCIIEncoding.ASCII.GetBytes(strDESKey);

//把向量转换成字节数组

byte[] bytesDESIV=ASCIIEncoding.ASCII.GetBytes(strDESIV);

//声明1个新的DES对象

DESCryptoServiceProvider desEncrypt=newDESCryptoServiceProvider();

//开辟一块内存流

MemoryStream msEncrypt=newMemoryStream();

//把内存流对象包装成加密流对象

CryptoStream csEncrypt=newCryptoStream(msEncrypt,desEncrypt.CreateEncryptor(bytesDESKey,bytesDESIV),CryptoStreamMode.Write);

//把加密流对象包装成写入流对象

StreamWriter swEncrypt=newStreamWriter(csEncrypt);

//写入流对象写入明文

swEncrypt.WriteLine(strPlain);

//写入流关闭

swEncrypt.Close();

//加密流关闭

csEncrypt.Close();

//把内存流转换成字节数组，内存流现在已经是密文了

byte[] bytesCipher=msEncrypt.ToArray();

//内存流关闭

msEncrypt.Close();

//把密文字节数组转换为字符串，并返回

returnUnicodeEncoding.Unicode.GetString(bytesCipher);

}

/// <summary>

/// DES解密方法

/// </summary>

/// <param name="strCipher">密文</param>

/// <param name="strDESKey">密钥</param>

/// <param name="strDESIV">向量</param>

/// <returns>明文</returns>

publicstringDESDecrypt(stringstrCipher,stringstrDESKey,stringstrDESIV)

{

//把密钥转换成字节数组

byte[] bytesDESKey=ASCIIEncoding.ASCII.GetBytes(strDESKey);

//把向量转换成字节数组

byte[] bytesDESIV=ASCIIEncoding.ASCII.GetBytes(strDESIV);

//把密文转换成字节数组

byte[] bytesCipher=UnicodeEncoding.Unicode.GetBytes(strCipher);

//声明1个新的DES对象

DESCryptoServiceProvider desDecrypt=newDESCryptoServiceProvider();

//开辟一块内存流，并存放密文字节数组

MemoryStream msDecrypt=newMemoryStream(bytesCipher);

//把内存流对象包装成解密流对象

CryptoStream csDecrypt=newCryptoStream(msDecrypt,desDecrypt.CreateDecryptor(bytesDESKey,bytesDESIV),CryptoStreamMode.Read);

//把解密流对象包装成读出流对象

StreamReader srDecrypt=newStreamReader(csDecrypt);

//明文=读出流的读出内容

stringstrPlainText=srDecrypt.ReadLine();

//读出流关闭

srDecrypt.Close();

//解密流关闭

csDecrypt.Close();

//内存流关闭

msDecrypt.Close();

//返回明文

returnstrPlainText;

}