Add migrated to .NET 8.0 variant of Hcs.Client

Hcs.ClientNet/GostCryptography/Base/GostSignatureDeformatter.cs

@@ -0,0 +1,77 @@
+using GostCryptography.Properties;
+using System;
+using System.Security.Cryptography;
+
+namespace GostCryptography.Base
+{
+    /// <summary>
+    /// Класс проверки цифровой подписи ГОСТ
+    /// </summary>
+    public class GostSignatureDeformatter : AsymmetricSignatureDeformatter
+    {
+        /// <summary>
+        /// Конструктор
+        /// </summary>
+        public GostSignatureDeformatter()
+        {
+        }
+
+        /// <summary>
+        /// Конструктор
+        /// </summary>
+        /// <param name="publicKey">Открытый ключ для проверки цифровой подписи</param>
+        /// <exception cref="ArgumentOutOfRangeException"></exception>
+        /// <exception cref="ArgumentNullException"></exception>
+        public GostSignatureDeformatter(AsymmetricAlgorithm publicKey) : this()
+        {
+            SetKey(publicKey);
+        }
+
+        private GostAsymmetricAlgorithm _publicKey;
+
+        /// <inheritdoc />
+        public override void SetKey(AsymmetricAlgorithm publicKey)
+        {
+            if (publicKey == null)
+            {
+                throw ExceptionUtility.ArgumentNull(nameof(publicKey));
+            }
+
+            if (!(publicKey is GostAsymmetricAlgorithm gostPublicKey))
+            {
+                if (publicKey.SignatureAlgorithm.IndexOf("gost", StringComparison.OrdinalIgnoreCase) < 0)
+                {
+                    throw ExceptionUtility.ArgumentOutOfRange(nameof(publicKey), Resources.ShouldSupportGost3410);
+                }
+
+                gostPublicKey = new GostExternalAsymmetricAlgorithm(publicKey);
+            }
+
+            _publicKey = gostPublicKey;
+        }
+
+        /// <inheritdoc />
+        public override void SetHashAlgorithm(string hashAlgorithmName)
+        {
+        }
+
+        /// <inheritdoc />
+        public override bool VerifySignature(byte[] hash, byte[] signature)
+        {
+            if (hash == null)
+            {
+                throw ExceptionUtility.ArgumentNull(nameof(hash));
+            }
+
+            if (signature == null)
+            {
+                throw ExceptionUtility.ArgumentNull(nameof(signature));
+            }
+
+            var reverseSignature = (byte[])signature.Clone();
+            Array.Reverse(reverseSignature);
+
+            return _publicKey.VerifySignature(hash, reverseSignature);
+        }
+    }
+}