ASP.NET加密解密

region DES加密解密
/// <summary>
/// DES加密
/// </summary>
/// <param name="strSource">待加密字串</param>
/// <param name="key">32位Key值</param>
/// <returns>加密后的字符串</returns>
public string DESEncrypt(string strSource)
{
    return DESEncrypt(strSource, DESKey);
}
public string DESEncrypt(string strSource, byte[] key)
{
    SymmetricAlgorithm sa = Rijndael.Create();
    sa.Key = key;
    sa.Mode = CipherMode.ECB;
    sa.Padding = PaddingMode.Zeros;
    MemoryStream ms = new MemoryStream();
    CryptoStream cs = new CryptoStream(ms, sa.CreateEncryptor(), CryptoStreamMode.Write);
    byte[] byt = Encoding.Unicode.GetBytes(strSource);
    cs.Write(byt, 0, byt.Length);
    cs.FlushFinalBlock();
    cs.Close();
    return Convert.ToBase64String(ms.ToArray());
}
/// <summary>
/// DES解密
/// </summary>
/// <param name="strSource">待解密的字串</param>
/// <param name="key">32位Key值</param>
/// <returns>解密后的字符串</returns>
public string DESDecrypt(string strSource)
{
    return DESDecrypt(strSource, DESKey);
}
public string DESDecrypt(string strSource, byte[] key)
{
    SymmetricAlgorithm sa = Rijndael.Create();
    sa.Key = key;
    sa.Mode = CipherMode.ECB;
    sa.Padding = PaddingMode.Zeros;
    ICryptoTransform ct = sa.CreateDecryptor();
    byte[] byt = Convert.FromBase64String(strSource);
    MemoryStream ms = new MemoryStream(byt);
    CryptoStream cs = new CryptoStream(ms, ct, CryptoStreamMode.Read);
    StreamReader sr = new StreamReader(cs, Encoding.Unicode);
    return sr.ReadToEnd();
}
endregion
region 一个用hash实现的加密解密方法
/// <summary>
/// 加密
/// </summary>
/// <param name="src"></param>
/// <returns></returns>
public static string EncryptStrByHash(string src)
{
    if (src.Length == 0)
    {
        return "";
    }
    byte[] HaKey = System.Text.Encoding.ASCII.GetBytes((src + "Test").ToCharArray());
    byte[] HaData = new byte[20];
    HMACSHA1 Hmac = new HMACSHA1(HaKey);
    CryptoStream cs = new CryptoStream(Stream.Null, Hmac, CryptoStreamMode.Write);
    try
    {
        cs.Write(HaData, 0, HaData.Length);
    }
    finally
    {
        cs.Close();
    }
    string HaResult = 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 =   { };
    MemoryStream ms = new MemoryStream();
    RijndaelManaged rv = new RijndaelManaged();
    cs = new CryptoStream(ms, rv.CreateEncryptor(RiKey, RiKey), CryptoStreamMode.Write);
    try
    {
        cs.Write(RiDataBuf, 0, RiDataBuf.Length);
        cs.FlushFinalBlock();
        EncodedBytes = ms.ToArray();
    }
    finally
    {
        ms.Close();
        cs.Close();
    }
    return HaResult + System.Convert.ToBase64String(EncodedBytes);
}
/// <summary>
/// 解密
/// </summary>
/// <param name="src"></param>
/// <returns></returns>
public static string DecrypStrByHash(string src)
{
    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 = new byte[SrcBytes.Length];
    RijndaelManaged rv = new RijndaelManaged();
    MemoryStream ms = new MemoryStream(SrcBytes);
    CryptoStream cs = new CryptoStream(ms, rv.CreateDecryptor(RiKey, RiKey), CryptoStreamMode.Read);
    try
    {
        cs.Read(InitialText, 0, InitialText.Length);
    }
    finally
    {
        ms.Close();
        cs.Close();
    }
    System.Text.StringBuilder Result = new System.Text.StringBuilder();
    for (int i = 0; i < InitialText.Length; ++i) if (InitialText[i] > 0) Result.Append((char)InitialText[i]);
    return Result.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>
/// <param name="s"></param>
/// <returns></returns>
public string ReEncryptStrByHash(string s)
{
    string e = Encrypt.EncryptStrByHash(s);
    return ((e.Length > 16) ? e.Substring(16) : "");
}
endregion
region Md5加密,生成16位或32位,生成的密文都是大写
public static string Md5To16(string str)
{
    MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
    string t2 = BitConverter.ToString(md5.ComputeHash(UTF8Encoding.Default.GetBytes(str)), 4, 8);
    t2 = t2.Replace("-", "");
    return t2;
}
//// <summary>
/// MD5　32位加密
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
public static string Md5To32(string str)
{
    string pwd = "";
    MD5 md5 = MD5.Create();
    byte[] s = md5.ComputeHash(Encoding.UTF8.GetBytes(str));
    for (int i = 0; i < s.Length; i++)
    {
        pwd = pwd + s[i].ToString("X");
    }
    return pwd;
}
endregion
region 3DES加密解密
public string Encrypt3DES(string str)
{
    //密钥
    string sKey = "wyw308";
    //    //矢量,可为空
    string sIV = "scf521";
    //    //构造对称算法
    SymmetricAlgorithm mCSP = new TripleDESCryptoServiceProvider();

ICryptoTransform ct;
MemoryStream ms;
CryptoStream cs;
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 = new MemoryStream();
cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);
cs.Write(byt, 0, byt.Length);
cs.FlushFinalBlock();
cs.Close();
return Convert.ToBase64String(ms.ToArray());

}
/// <summary>
/// 带指定密钥和矢量的3DES加密
/// </summary>
/// <param name="str"></param>
/// <param name="sKey"></param>
/// <param name="sIV"></param>
/// <returns></returns>
public string Encrypt3DES(string str, string sKey, string sIV)
{
    SymmetricAlgorithm mCSP = new TripleDESCryptoServiceProvider();
    ICryptoTransform ct;
    MemoryStream ms;
    CryptoStream cs;
    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 = new MemoryStream();
    cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);
    cs.Write(byt, 0, byt.Length);
    cs.FlushFinalBlock();
    cs.Close();
    return Convert.ToBase64String(ms.ToArray());
}
//解密
public string Decrypt3DES(string Value)
{
    string sKey = "wyw308";
    string sIV = "scf521";
    SymmetricAlgorithm mCSP = new TripleDESCryptoServiceProvider();
    ICryptoTransform ct;
    MemoryStream ms;
    CryptoStream cs;
    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 = new MemoryStream();
    cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);
    cs.Write(byt, 0, byt.Length);
    cs.FlushFinalBlock();
    cs.Close();
    return Encoding.UTF8.GetString(ms.ToArray());
}
/// <summary>
/// 带指定密钥和矢量的3DES解密
/// </summary>
/// <param name="Value"></param>
/// <param name="sKey"></param>
/// <param name="sIV"></param>
/// <returns></returns>
public string Decrypt3DES(string str, string sKey, string sIV)
{
    SymmetricAlgorithm mCSP = new TripleDESCryptoServiceProvider();
    ICryptoTransform ct;
    MemoryStream ms;
    CryptoStream cs;
    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 = new MemoryStream();
    cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);
    cs.Write(byt, 0, byt.Length);
    cs.FlushFinalBlock();
    cs.Close();
    return Encoding.UTF8.GetString(ms.ToArray());
}
endregion
region 一个简单的加密解密方法,只支持英文
public static string EnCryptEnStr(string str) //倒序加1加密
{
    byte[] by = new byte[str.Length];
    for (int i = 0;
     i <= str.Length - 1;
     i++)
    {
        by[i] = (byte)((byte)str[i] + 1);
    }
    str = "";
    for (int i = by.Length - 1;
     i >= 0;
     i--)
    {
        str += ((char)by[i]).ToString();
    }
    return str;
}
public static string DeCryptEnStr(string str) //顺序减1解码
{
    byte[] by = new byte[str.Length];
    for (int i = 0;
     i <= str.Length - 1;
     i++)
    {
        by[i] = (byte)((byte)str[i] - 1);
    }
    str = "";
    for (int i = by.Length - 1;
     i >= 0;
     i--)
    {
        str += ((char)by[i]).ToString();
    }
    return str;
}
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
public static string EnCryptCnStr(string str)
{
    string htext = ""; // blank text

for (int i = 0; i < str.Length; i++)
{
    htext = htext + (char)(str[i] + 10 - 1 * 2);
}
return htext;

}
public static string DeCryptCnStr(string str)
{
    string dtext = "";

for (int i = 0; i < str.Length; i++)
{
    dtext = dtext + (char)(str[i] - 10 + 1 * 2);
}
return dtext;

}
endregion
region Url地址编码解码
/// <summary>
/// 编码Url地址
/// </summary>
/// <param name="url"></param>
/// <returns></returns>
public static string UrlEncode(string url)
{
    byte[] mByte = null;
    mByte = System.Text.Encoding.GetEncoding("GB2312").GetBytes(url);

return System.Web.HttpUtility.UrlEncode(mByte);

}
/// <summary>
/// 解码Url地址
/// </summary>
/// <param name="url"></param>
/// <returns></returns>
public static string UrlDecode(string url)
{
    return HttpUtility.UrlDecode(url, System.Text.Encoding.GetEncoding("GB2312"));
}
endregion
</pre>