[摘抄]C# RSA、DES加解密

//默认密钥向量

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

private static DESCryptoServiceProvider des = new DESCryptoServiceProvider();

/// <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());

        byte[] inputByteArray = Encoding.GetEncoding("UTF-8").GetBytes(encryptString);

        des.Key = ASCIIEncoding.ASCII.GetBytes(encryptKey.Substring(0, 8));

        des.IV = ASCIIEncoding.ASCII.GetBytes(encryptKey.Substring(0, 8));

        MemoryStream ms = new MemoryStream();

        CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);

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

        cs.FlushFinalBlock();

        StringBuilder ret = new StringBuilder();

        foreach (byte b in ms.ToArray())

        {

            ret.AppendFormat("{0:X2}", b);

        }

        return ret.ToString();

    }

    catch (Exception ex)

    {

        Log.WriteLog(ex);

        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.Substring(0, 8));

        //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());

        byte[] inputByteArray = new byte[decryptString.Length / 2];

        for (int x = 0; x < decryptString.Length / 2; x++)

        {

            int i = (Convert.ToInt32(decryptString.Substring(x * 2, 2), 16));

            inputByteArray[x] = (byte)i;

        }

        des.Key = ASCIIEncoding.ASCII.GetBytes(decryptKey.Substring(0, 8));

        des.IV = ASCIIEncoding.ASCII.GetBytes(decryptKey.Substring(0, 8));

        MemoryStream ms = new MemoryStream();

        CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);

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

        cs.FlushFinalBlock();

        StringBuilder ret = new StringBuilder();

        return System.Text.Encoding.UTF8.GetString(ms.ToArray());

    }

    catch (Exception ex)

    {

        Log.WriteLog(ex);

        return decryptString;

    }

}

/// <summary>

/// RSA 的密钥产生 产生私钥 和公钥

/// </summary>

/// <param name="xmlKeys"></param>

/// <param name="xmlPublicKey"></param>

public void RSAKey(out string xmlKeys, out string xmlPublicKey)

{

    System.Security.Cryptography.RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();

    xmlKeys = rsa.ToXmlString(true);

    xmlPublicKey = rsa.ToXmlString(false);

}

const string PUBLICKEY = "<RSAKeyValue><Modulus>1E1BqQ0uipllOGPMKB4YO/ZutHO0pfQz6jQKFs1y958Vm8YO77APoI65hFYZbFLer3MKx2Obp1Y0DyUyuNIes+IhS7I4nHBS4igdvhohUZDhLLphiuDZ3i5NkBQDVqex/UdTvLbzmVI29bThTEGyWzHYtrIjNqM+IJJnqOquXMs=</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>";

const string PRIVATEKEY = "<RSAKeyValue><Modulus>1E1BqQ0uipllOGPMKB4YO/ZutHO0pfQz6jQKFs1y958Vm8YO77APoI65hFYZbFLer3MKx2Obp1Y0DyUyuNIes+IhS7I4nHBS4igdvhohUZDhLLphiuDZ3i5NkBQDVqex/UdTvLbzmVI29bThTEGyWzHYtrIjNqM+IJJnqOquXMs=</Modulus><Exponent>AQAB</Exponent><P>8iXyePGppOkS1hnvMPC5FVfbSDMfSAPfsmXCX3LgoJYxt+n0p1Mm/ZyVnSHm8xJdObGznLRyrVZomuuk6DCyYw==</P><Q>4HI71hZ7VYSWT0ZTehNKvAlhxETWNQlD2YxRwvuHmcVI2+tN7m/RTLkspfXyKsd/opvcqnQeHv2m/LUtiUWEeQ==</Q><DP>UtLH7LY74DwYRUL5nTO5GqPCTR+vQ2KP0OUdZqhUTJkSyGUtWU4HuBcm1WgTJnDRkjpFxQOzdbZocRTIguKlIQ==</DP><DQ>0qJiBUiT9m23oi4dqTLxsAYd+lOfs6Y+RqupD5N+bpD3D2yEdn/5rEcb36Qw4HTZE4GyVUUj/3GMhRyC35CeAQ==</DQ><InverseQ>M1c29WqJO9ET8ymHaBq+Q5gRdpJ79jzV2RlydcMq0dCmHiHjeAwFilVj8AROjvuiOo71fUCleL9+leuOoKgUvg==</InverseQ><D>W14obQX0Ssf7rQoeOgHBskS7nkPRsj5n/VqKIQgoe3NmzFSv5u3hu9rQ8qhPZrQ/jEi5kdhHi/voicAblTkw5rcS7qfamv8NOLz6KV5HwUcyW0eAqL97w7LOJohw7S/3NGblftA76oHGpOpKpZf+u1g7e7w8xRS6RbZ3zqP6yzE=</D></RSAKeyValue>";

/// 加密

/// 待加密的字符串

[ThreadStatic]

private static RSACryptoServiceProvider rsa = null;

[ThreadStatic]

private static RSACryptoServiceProvider dersa = null;

/// <summary>

///

/// </summary>

/// <param name="word"></param>

/// <returns></returns>

public static string RSAEncryption(string word)

{

    //CspParameters param = new CspParameters();

    //param.KeyContainerName = PUBLICKEY;

    if (rsa == null)

    {

        rsa = new RSACryptoServiceProvider();

        rsa.FromXmlString(PUBLICKEY);

    }

    byte[] plaindata = System.Text.Encoding.Default.GetBytes(word);

    byte[] encryptdata = rsa.Encrypt(plaindata, false);

    string encryptstring = Convert.ToBase64String(encryptdata);

    return encryptstring;

}

///

/// 解密，当密文不正确时，可能会抛出异常

///

/// 待解密的密文字符串

///

public static string RSADecryption(string encryptWord)

{

    //CspParameters param = new CspParameters();

    //param.KeyContainerName = PRIVATEKEY;

    if (dersa == null)

    {

        rsa = new RSACryptoServiceProvider();

        rsa.FromXmlString(PRIVATEKEY);

    }

    byte[] encryptdata = Convert.FromBase64String(encryptWord);

    byte[] decryptdata = rsa.Decrypt(encryptdata, false);

    string plaindata = System.Text.Encoding.Default.GetString(decryptdata);

    return plaindata;

}