3DES 加解密，对长度不限制
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3DES 加解密，对长度不限制
小編覺得挺不錯的,現在分享給大家,幫大家做個參考.
#region 3DES
/// <summary>
/// 3DES加密
/// </summary>
/// <param name="strString">需加密的字符串</param>
/// <param name="strKey">密匙</param>
/// <returns></returns>
public static string DES3Encrypt(string strString, string strKey)
{
strString = strString + "".PadLeft();
byte[] bMsg = Encoding.GetEncoding("GBK").GetBytes(strString); int l = (bMsg.Length / + ) * ;
byte[] btMsg = new byte[l];
Array.Copy(bMsg, btMsg, bMsg.Length); byte[] digestOfPassword = Encoding.Default.GetBytes(strKey);
byte[] keyBytes = new byte[];
Array.Copy(digestOfPassword, keyBytes, digestOfPassword.Length);
for (int j = , k = ; j < ; )
{
keyBytes[k++] = keyBytes[j++];
}
TripleDESCryptoServiceProvider DES = new TripleDESCryptoServiceProvider();
DES.Mode = CipherMode.ECB;
ICryptoTransform DESEncrypt = DES.CreateEncryptor(keyBytes, keyBytes);
var dd = DESEncrypt.TransformFinalBlock(btMsg, , btMsg.Length);
return byte2hex(dd).ToString().Substring(, (bMsg.Length / + ) * );
} public static String getAdd(int length, String strKey)
{
byte[] btMsg = new byte[length / ]; byte[] digestOfPassword = Encoding.UTF8.GetBytes(strKey);
//byte[] digestOfPassword = Encoding.Default.GetBytes(strKey);
byte[] keyBytes = new byte[];
Array.Copy(digestOfPassword, keyBytes, digestOfPassword.Length);
for (int j = , k = ; j < ; )
{
keyBytes[k++] = keyBytes[j++];
} TripleDESCryptoServiceProvider DES = new TripleDESCryptoServiceProvider();
DES.Mode = CipherMode.ECB;
ICryptoTransform DESEncrypt = DES.CreateEncryptor(keyBytes, keyBytes);
var dd = DESEncrypt.TransformFinalBlock(btMsg, , btMsg.Length);
String rtn = byte2hex(dd);
return rtn.Substring(length);
} /// <summary>
/// 字節數組轉16進制字符串
/// </summary>
/// <param name="bytes"></param>
/// <returns></returns>
private static string byte2hex(byte[] dd)
{
StringBuilder ret = new StringBuilder();
foreach (var item in dd)
{
ret.AppendFormat("{0:X2}", item);
}
return ret.ToString();
}
/// <summary>
/// 字符串轉16進制字節數組
/// </summary>
/// <param name="hexString"></param>
/// <returns></returns>
private static byte[] strToToHexByte(string hexString)
{
hexString = hexString.Replace(" ", "");
if ((hexString.Length % ) != )
hexString += " ";
byte[] returnBytes = new byte[hexString.Length / ];
for (int i = ; i < returnBytes.Length; i++)
returnBytes[i] = Convert.ToByte(hexString.Substring(i * , ), );
return returnBytes;
}
/// <summary>
/// 3DES解密
/// </summary>
/// <param name="strString">需解密的字符串</param>
/// <param name="strKey">密匙</param>
/// <returns></returns>
public static string DES3Decrypt(string strString, string strKey)
{
strString += getAdd(strString.Length, strKey); byte[] digestOfPassword = Encoding.Default.GetBytes(strKey);
byte[] keyBytes = new byte[];
Array.Copy(digestOfPassword, keyBytes, digestOfPassword.Length);
for (int j = , k = ; j < ; )
{
keyBytes[k++] = keyBytes[j++];
}
TripleDESCryptoServiceProvider DES = new TripleDESCryptoServiceProvider();
DES.Mode = CipherMode.ECB;
ICryptoTransform DESDecrypt = DES.CreateDecryptor(keyBytes, keyBytes);
string result = "";
try
{
byte[] Buffer = strToToHexByte(strString);
byte[] bb = DESDecrypt.TransformFinalBlock(Buffer, , Buffer.Length);
result = Encoding.GetEncoding("GBK").GetString(bb);
}
catch (Exception e)
{
throw e;
}
return result;
}
#endregion
2015-1-13 添加
在我傳遞key時，出現
查資料，原來是key的長度大于24了，（IV則是8位，但我沒有傳遞）
修改后的3DES算法
#region 3DES
/// <summary>
/// 3DES加密
/// </summary>
/// <param name="strString">需加密的字符串</param>
/// <param name="strKey">密匙</param>
/// <returns></returns>
public static string DES3Encrypt(string strString, string strKey)
{
byte[] bMsg = Encoding.UTF8.GetBytes(strString);
TripleDESCryptoServiceProvider DES = new TripleDESCryptoServiceProvider();
DES.Mode = CipherMode.ECB; string key = strKey;
while (key.Length < )
{
key += strKey;
}
byte[] digestOfPassword = Encoding.UTF8.GetBytes(key);
byte[] keyBytes = new byte[];
Array.Copy(digestOfPassword.Take().ToArray(), keyBytes, digestOfPassword.Take().ToArray().Length); DES.Key = keyBytes;
ICryptoTransform DESEncrypt = DES.CreateEncryptor();
var dd = DESEncrypt.TransformFinalBlock(bMsg, , bMsg.Length);
return Convert.ToBase64String(dd);
} /// <summary>
/// 3DES解密
/// </summary>
/// <param name="strString">需解密的字符串</param>
/// <param name="strKey">密匙</param>
/// <returns></returns>
public static string DES3Decrypt(string strString, string strKey)
{
TripleDESCryptoServiceProvider DES = new TripleDESCryptoServiceProvider();
DES.Mode = CipherMode.ECB;
string key = strKey;
while (key.Length < )
{
key += strKey;
}
byte[] digestOfPassword = Encoding.UTF8.GetBytes(key);
byte[] keyBytes = new byte[];
Array.Copy(digestOfPassword.Take().ToArray(), keyBytes, digestOfPassword.Take().ToArray().Length);
DES.Key = keyBytes;
ICryptoTransform DESDecrypt = DES.CreateDecryptor();
string result = "";
try
{
byte[] Buffer = Convert.FromBase64String(strString);
byte[] bb = DESDecrypt.TransformFinalBlock(Buffer, , Buffer.Length);
result = Encoding.UTF8.GetString(bb);
}
catch (Exception e)
{
throw e;
}
return result;
}
#endregion
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