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87 lines
No EOL
2.7 KiB
C#
87 lines
No EOL
2.7 KiB
C#
#region License Information (GPL v3)
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/*
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ShareX - A program that allows you to take screenshots and share any file type
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Copyright (c) 2007-2018 ShareX Team
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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Optionally you can also view the license at <http://www.gnu.org/licenses/>.
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*/
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#endregion License Information (GPL v3)
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using System;
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using System.Security.Cryptography;
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using System.Text;
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namespace ShareX.UploadersLib
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{
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public enum OAuth2ChallengeMethod
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{
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Plain, SHA256
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}
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public class OAuth2ProofKey
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{
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public string CodeVerifier { get; private set; }
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public string CodeChallenge { get; private set; }
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private OAuth2ChallengeMethod Method;
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public string ChallengeMethod
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{
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get
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{
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switch (Method)
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{
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case OAuth2ChallengeMethod.Plain: return "plain";
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case OAuth2ChallengeMethod.SHA256: return "S256";
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}
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return "";
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}
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}
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public OAuth2ProofKey(OAuth2ChallengeMethod method)
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{
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Method = method;
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byte[] buffer = new byte[32];
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using (RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider())
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{
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rng.GetBytes(buffer);
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}
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CodeVerifier = CleanBase64(buffer);
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CodeChallenge = CodeVerifier;
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if (Method == OAuth2ChallengeMethod.SHA256)
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{
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using (SHA256 sha = SHA256.Create())
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{
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sha.ComputeHash(Encoding.UTF8.GetBytes(CodeVerifier));
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CodeChallenge = CleanBase64(sha.Hash);
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}
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}
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}
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private string CleanBase64(byte[] buffer)
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{
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StringBuilder sb = new StringBuilder(Convert.ToBase64String(buffer));
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sb.Replace('+', '-');
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sb.Replace('/', '_');
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sb.Replace("=", "");
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return sb.ToString();
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}
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}
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} |