Common classes for string encryption and decryption

String encryption and decryption common classes: Reprint to:

Http://www.cnblogs.com/malaohu/p/3214136.html

publicsealed classEncryptUtils

{

#region Base64加密解密

/// <summary>

/// Base64加密

/// </summary>

/// <param name="input">需要加密的字符串</param>

/// <returns></returns>

publicstatic string Base64Encrypt(stringinput)

{

returnBase64Encrypt(input, newUTF8Encoding());

}

/// <summary>

/// Base64加密

/// </summary>

/// <param name="input">需要加密的字符串</param>

/// <param name="encode">字符编码</param>

/// <returns></returns>

publicstatic string Base64Encrypt(stringinput, Encoding encode)

{

returnConvert.ToBase64String(encode.GetBytes(input));

}

/// <summary>

/// Base64解密

/// </summary>

/// <param name="input">需要解密的字符串</param>

/// <returns></returns>

publicstatic string Base64Decrypt(stringinput)

{

returnBase64Decrypt(input, newUTF8Encoding());

}

/// <summary>

/// Base64解密

/// </summary>

/// <param name="input">需要解密的字符串</param>

/// <param name="encode">字符的编码</param>

/// <returns></returns>

publicstatic string Base64Decrypt(stringinput, Encoding encode)

{

returnencode.GetString(Convert.FromBase64String(input));

}

#endregion

#region DES加密解密

/// <summary>

/// DES加密

/// </summary>

/// <param name="data">加密数据</param>

/// <param name="key">8位字符的密钥字符串</param>

/// <param name="iv">8位字符的初始化向量字符串</param>

/// <returns></returns>

publicstatic string DESEncrypt(string data, string key, stringiv)

{

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

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

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);

}

/// <summary>

/// DES解密

/// </summary>

/// <param name="data">解密数据</param>

/// <param name="key">8位字符的密钥字符串(需要和加密时相同)</param>

/// <param name="iv">8位字符的初始化向量字符串(需要和加密时相同)</param>

/// <returns></returns>

publicstatic string DESDecrypt(string data, string key, stringiv)

{

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

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

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();

}

#endregion

#region MD5加密

/// <summary>

/// MD5加密

/// </summary>

/// <param name="input">需要加密的字符串</param>

/// <returns></returns>

publicstatic string MD5Encrypt(stringinput)

{

returnMD5Encrypt(input, newUTF8Encoding());

}

/// <summary>

/// MD5加密

/// </summary>

/// <param name="input">需要加密的字符串</param>

/// <param name="encode">字符的编码</param>

/// <returns></returns>

publicstatic string MD5Encrypt(stringinput, Encoding encode)

{

MD5 md5 = newMD5CryptoServiceProvider();

byte[] t = md5.ComputeHash(encode.GetBytes(input));

StringBuilder sb = newStringBuilder(32);

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

sb.Append(t[i].ToString("x").PadLeft(2, ‘0‘));

returnsb.ToString();

}

/// <summary>

/// MD5对文件流加密

/// </summary>

/// <param name="sr"></param>

/// <returns></returns>

publicstatic stringMD5Encrypt(Stream stream)

{

MD5 md5serv = MD5CryptoServiceProvider.Create();

byte[] buffer = md5serv.ComputeHash(stream);

StringBuilder sb = newStringBuilder();

foreach(byte var inbuffer)

sb.Append(var.ToString("x2"));

returnsb.ToString();

}

/// <summary>

/// MD5加密(返回16位加密串)

/// </summary>

/// <param name="input"></param>

/// <param name="encode"></param>

/// <returns></returns>

publicstatic string MD5Encrypt16(stringinput, Encoding encode)

{

MD5CryptoServiceProvider md5 = newMD5CryptoServiceProvider();

stringresult = BitConverter.ToString(md5.ComputeHash(encode.GetBytes(input)), 4, 8);

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

returnresult;

}

#endregion

#region 3DES 加密解密

publicstatic string DES3Encrypt(string data, stringkey)

{

TripleDESCryptoServiceProvider DES = newTripleDESCryptoServiceProvider();

DES.Key = ASCIIEncoding.ASCII.GetBytes(key);

DES.Mode = CipherMode.CBC;

DES.Padding = PaddingMode.PKCS7;

ICryptoTransform DESEncrypt = DES.CreateEncryptor();

byte[] Buffer = ASCIIEncoding.ASCII.GetBytes(data);

returnConvert.ToBase64String(DESEncrypt.TransformFinalBlock(Buffer, 0, Buffer.Length));

}

publicstatic string DES3Decrypt(string data, stringkey)

{

TripleDESCryptoServiceProvider DES = newTripleDESCryptoServiceProvider();

DES.Key = ASCIIEncoding.ASCII.GetBytes(key);

DES.Mode = CipherMode.CBC;

DES.Padding = System.Security.Cryptography.PaddingMode.PKCS7;

ICryptoTransform DESDecrypt = DES.CreateDecryptor();

stringresult = "";

try

{

byte[] Buffer = Convert.FromBase64String(data);

result = ASCIIEncoding.ASCII.GetString(DESDecrypt.TransformFinalBlock(Buffer, 0, Buffer.Length));

}

catch(Exception e)

{

}

returnresult;

}

#endregion

}

Common classes for string encryption and decryption