/// <summary>
/// 解密
/// </summary>
string Decrypt(Encrypt_Type DecryptType, byte[] DecryptBytes, string Key, string IV = "")
{
try
{
SymmetricAlgorithm ect = null;
switch (DecryptType)
{
case Encrypt_Type.DES_Base64:
ect = new DESCryptoServiceProvider();
if (string.IsNullOrEmpty(IV))
{
IV = Key.Substring(0, 8);
}
break;
case Encrypt_Type.DES3:
ect = new TripleDESCryptoServiceProvider();
if (string.IsNullOrEmpty(IV))
{
IV = Key.Substring(0, 8);
}
ect.BlockSize = BlockSize;
break;
case Encrypt_Type.AES:
ect = new RijndaelManaged();
if (string.IsNullOrEmpty(IV))
{
IV = Key.Substring(0, 16);
}
ect.BlockSize = BlockSize;
break;
case Encrypt_Type.DES_MD5:
ect = new DESCryptoServiceProvider();
if (string.IsNullOrEmpty(IV))
{
IV = Key;
}
ect.Key = Encode.GetBytes(Key);
ect.IV = Encode.GetBytes(IV);
ect.Mode = Mode;
ect.Padding = Padding;
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, ect.CreateDecryptor(), CryptoStreamMode.Write);
cs.Write(DecryptBytes, 0, DecryptBytes.Length);
cs.FlushFinalBlock();
return(Encode.GetString(ms.ToArray()));
case Encrypt_Type.RC2:
ect = new RC2CryptoServiceProvider();
if (string.IsNullOrEmpty(IV))
{
IV = Key.Substring(0, 8);
}
ect.BlockSize = BlockSize;
break;
case Encrypt_Type.RC4:
RC4CryptoServiceProvider rc4 = new RC4CryptoServiceProvider();
rc4.Encode = Encode;
return(rc4.Decrypt(DecryptBytes, Key));
case Encrypt_Type.RSA:
RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
RSA.FromXmlString(Key);
byte[] decryptedData = RSA.Decrypt(DecryptBytes, false);
return(Encode.GetString(decryptedData));
default:
return(string.Empty);
}
ect.Key = Encode.GetBytes(Key);
ect.IV = Encode.GetBytes(IV);
ect.Mode = Mode;
ect.Padding = Padding;
ICryptoTransform Decrypt = ect.CreateDecryptor();
byte[] result = Decrypt.TransformFinalBlock(DecryptBytes, 0, DecryptBytes.Length);
return(Encode.GetString(result));
}
catch (Exception ex) { if (throwEx)
{
throw ex;
}
}
return(null);
}
