Restore SEBPatch

SafeExamBrowser.Configuration.Contracts/Cryptography/IKeyGenerator.cs

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2024 ETH Zürich, IT Services
+ * 
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+namespace SafeExamBrowser.Configuration.Contracts.Cryptography
+{
+	/// <summary>
+	/// Provides funcionality to calculate keys for integrity checks.
+	/// </summary>
+	public interface IKeyGenerator
+	{
+		/// <summary>
+		/// Calculates the encrypted value of the app signature key.
+		/// </summary>
+		string CalculateAppSignatureKey(string connectionToken, string salt);
+
+		/// <summary>
+		/// Calculates the hash value of the browser exam key (BEK) for the given URL.
+		/// </summary>
+		string CalculateBrowserExamKeyHash(string configurationKey, byte[] salt, string url);
+
+		/// <summary>
+		/// Calculates the hash value of the configuration key (CK) for the given URL.
+		/// </summary>
+		string CalculateConfigurationKeyHash(string configurationKey, string url);
+
+		/// <summary>
+		/// Specifies that a custom browser exam key (BEK) should be used.
+		/// </summary>
+		void UseCustomBrowserExamKey(string browserExamKey);
+	}
+}