C#常用的加密算法

方法一：

//须添加对System.Web的引用

using System.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>

public string SHA1(string source)

{

return FormsAuthentication.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>

public string MD5(string source)

{

return FormsAuthentication.HashPasswordForStoringInConfigFile(source, "MD5");;

}

方法二(可逆加密解密)：

using System.Security.Cryptography;

...

public string Encode(string data)

{

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

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

DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();

int i = cryptoProvider.KeySize;

MemoryStream ms = new MemoryStream();

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

StreamWriter sw = new StreamWriter(cst);

sw.Write(data);

sw.Flush();

cst.FlushFinalBlock();

sw.Flush();

return Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length);

}

public string Decode(string data)

{

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

{

return null;

}

DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();

MemoryStream ms = new MemoryStream(byEnc);

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

StreamReader sr = new StreamReader(cst);

return sr.ReadToEnd();

}

方法三(MD5不可逆)：

using System.Security.Cryptography;

...

//MD5不可逆加密

//32位加密

public string GetMD5_32(string s, string _input_charset)

{

MD5 md5 = new MD5CryptoServiceProvider();

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

StringBuilder sb = new StringBuilder(32);

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

{

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

}

return sb.ToString();

}

//16位加密

public static string GetMd5_16(string ConvertString)

{

MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();

string t2 = BitConverter.ToString(md5.ComputeHash(UTF8Encoding.Default.GetBytes(ConvertString)), 4, 8);

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

return t2;

}

方法四(对称加密)：

using System.IO;

using System.Security.Cryptography;

...

private SymmetricAlgorithm mobjCryptoService;

private string Key;

/// <summary>

/// 对称加密类的构造函数

/// </summary>

public SymmetricMethod()

{

mobjCryptoService = new RijndaelManaged();

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

}

/// <summary>

/// 获得密钥

/// </summary>

/// <returns>密钥</returns>

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);

}

/// <summary>

/// 获得初始向量IV

/// </summary>

/// <returns>初试向量IV</returns>

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);

}

/// <summary>

/// 加密方法

/// </summary>

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

/// <returns>经过加密的串</returns>

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);

}

/// <summary>

/// 解密方法

/// </summary>

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

/// <returns>经过解密的串</returns>

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();

}

方法五：

using System.IO;

using System.Security.Cryptography;

using System.Text;

...

//默认密钥向量

private static byte[] 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>

public static string EncryptDES(string encryptString, string encryptKey)

{

try

{

byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));

byte[] rgbIV = Keys;

byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);

DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();

MemoryStream mStream = new MemoryStream();

CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);

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

cStream.FlushFinalBlock();

return Convert.ToBase64String(mStream.ToArray());

}

catch

{

return encryptString;

}

/// <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>

public static string DecryptDES(string decryptString, string decryptKey)

{

try

{

byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);

byte[] rgbIV = Keys;

byte[] inputByteArray = Convert.FromBase64String(decryptString);

DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();

MemoryStream mStream = new MemoryStream();

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

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

cStream.FlushFinalBlock();

return Encoding.UTF8.GetString(mStream.ToArray());

}

catch

{

return decryptString;

}

方法六(文件加密)：

using System.IO;

using System.Security.Cryptography;

using System.Text;

...

//加密文件

private static void EncryptData(String inName, String outName, byte[] desKey, byte[] desIV)

{

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

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

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

fout.SetLength(0);

//Create variables to help with read and write.

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

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

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

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

DES des = new DESCryptoServiceProvider();

CryptoStream encStream = new CryptoStream(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

private static void DecryptData(String inName, String outName, byte[] desKey, byte[] desIV)

{

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

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

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

fout.SetLength(0);

//Create variables to help with read and write.

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

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

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

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

DES des = new DESCryptoServiceProvider();

CryptoStream encStream = new CryptoStream(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();

}

using System;

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

using System.Text;

using System.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>

public string DESEncrypt(string strPlain,string strDESKey,string strDESIV)

{

//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=new DESCryptoServiceProvider();

//开辟一块内存流

MemoryStream msEncrypt=new MemoryStream();

//把内存流对象包装成加密流对象

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

//把加密流对象包装成写入流对象

StreamWriter swEncrypt=new StreamWriter(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

return UnicodeEncoding.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>

public string DESDecrypt(string strCipher,string strDESKey,string strDESIV)

{

//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=new DESCryptoServiceProvider();

//开辟一块内存流，并存放密文字节数组

MemoryStream msDecrypt=new MemoryStream(bytesCipher);

//把内存流对象包装成解密流对象

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

//把解密流对象包装成读出流对象

StreamReader srDecrypt=new StreamReader(csDecrypt);

//明文=读出流的读出内容

string strPlainText=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

return strPlainText;

}

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