94 lines
3.5 KiB
C#
94 lines
3.5 KiB
C#
// (c) Copyright Ascensio System SIA 2010-2022
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//
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// This program is a free software product.
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// You can redistribute it and/or modify it under the terms
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// of the GNU Affero General Public License (AGPL) version 3 as published by the Free Software
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// Foundation. In accordance with Section 7(a) of the GNU AGPL its Section 15 shall be amended
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// to the effect that Ascensio System SIA expressly excludes the warranty of non-infringement of
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// any third-party rights.
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//
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// This program is distributed WITHOUT ANY WARRANTY, without even the implied warranty
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// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. For details, see
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// the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
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//
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// You can contact Ascensio System SIA at Lubanas st. 125a-25, Riga, Latvia, EU, LV-1021.
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//
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// The interactive user interfaces in modified source and object code versions of the Program must
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// display Appropriate Legal Notices, as required under Section 5 of the GNU AGPL version 3.
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//
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// Pursuant to Section 7(b) of the License you must retain the original Product logo when
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// distributing the program. Pursuant to Section 7(e) we decline to grant you any rights under
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// trademark law for use of our trademarks.
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//
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// All the Product's GUI elements, including illustrations and icon sets, as well as technical writing
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// content are licensed under the terms of the Creative Commons Attribution-ShareAlike 4.0
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// International. See the License terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode
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namespace ASC.Common.Utils;
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[Singletone]
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public class Signature
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{
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private readonly MachinePseudoKeys _machinePseudoKeys;
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public Signature(MachinePseudoKeys machinePseudoKeys)
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{
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_machinePseudoKeys = machinePseudoKeys;
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}
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public string Create<T>(T obj)
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{
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return Create(obj, Encoding.UTF8.GetString(_machinePseudoKeys.GetMachineConstant()));
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}
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public static string Create<T>(T obj, string secret)
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{
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var str = JsonConvert.SerializeObject(obj);
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var payload = GetHashBase64(str + secret) + "?" + str;
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return WebEncoders.Base64UrlEncode(Encoding.UTF8.GetBytes(payload));
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}
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public T Read<T>(string signature)
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{
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return Read<T>(signature, Encoding.UTF8.GetString(_machinePseudoKeys.GetMachineConstant()));
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}
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public T Read<T>(string signature, Action<string> signatureResolver = null)
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{
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return Read<T>(signature, Encoding.UTF8.GetString(_machinePseudoKeys.GetMachineConstant()), signatureResolver);
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}
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public static T Read<T>(string signature, string secret, Action<string> signatureResolver = null)
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{
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try
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{
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signatureResolver?.Invoke(signature);
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var payloadParts = Encoding.UTF8.GetString(WebEncoders.Base64UrlDecode(signature)).Split('?');
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if (GetHashBase64(payloadParts[1].Trim() + secret) == payloadParts[0])
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{
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return JsonConvert.DeserializeObject<T>(payloadParts[1].Trim()); //Sig correct
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}
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}
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catch (Exception) { }
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return default;
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}
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private static string GetHashBase64(string str)
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{
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using var sha256 = SHA256.Create();
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return Convert.ToBase64String(sha256.ComputeHash(Encoding.UTF8.GetBytes(str)));
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}
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private static string GetHashBase64MD5(string str)
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{
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using var md5 = MD5.Create();
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return Convert.ToBase64String(md5.ComputeHash(Encoding.UTF8.GetBytes(str)));
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}
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}
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