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Basic formatting applied. Unnecessary comments have been removed. Suspicious code is covered by TODO.
2025-08-12 11:21:10 +09:00
parent bbcbe841a7
commit 33ab055b43
546 changed files with 176950 additions and 0 deletions
--- a/Hcs.Client/GostCryptography/Gost_R3410/Gost_R3410_KeyExchangeDeformatter.cs
+++ b/Hcs.Client/GostCryptography/Gost_R3410/Gost_R3410_KeyExchangeDeformatter.cs
@ -0,0 +1,104 @@
+using GostCryptography.Asn1.Gost.Gost_R3410;
+using GostCryptography.Base;
+using GostCryptography.Properties;
+using System;
+using System.Security.Cryptography;
+
+namespace GostCryptography.Gost_R3410
+{
+    /// <summary>
+    /// Базовый класс для реализации дешифрования общего секретного ключа по ГОСТ Р 34.10
+    /// </summary>
+    /// <typeparam name="TKey">Информация о ключе цифровой подписи ГОСТ Р 34.10</typeparam>
+    /// <typeparam name="TKeyParams">Параметры ключа цифровой подписи ГОСТ Р 34.10</typeparam>
+    /// <typeparam name="TKeyAlgorithm">Алгоритм общего секретного ключа ГОСТ Р 34.10</typeparam>
+    public abstract class Gost_R3410_KeyExchangeDeformatter<TKey, TKeyParams, TKeyAlgorithm> : GostKeyExchangeDeformatter
+        where TKey : Gost_R3410_KeyExchange, new()
+        where TKeyParams : Gost_R3410_KeyExchangeParams
+        where TKeyAlgorithm : Gost_R3410_KeyExchangeAlgorithm
+    {
+        /// <summary>
+        /// Конструктор
+        /// </summary>
+        protected Gost_R3410_KeyExchangeDeformatter()
+        {
+        }
+
+        /// <summary>
+        /// Конструктор
+        /// </summary>
+        /// <param name="privateKey">Секретный ключ для расшифровки общего секретного ключа</param>
+        /// <exception cref="ArgumentOutOfRangeException"></exception>
+        /// <exception cref="ArgumentNullException"></exception>
+        protected Gost_R3410_KeyExchangeDeformatter(AsymmetricAlgorithm privateKey)
+        {
+            SetKey(privateKey);
+        }
+
+        private Gost_R3410_AsymmetricAlgorithmBase<TKeyParams, TKeyAlgorithm> _privateKey;
+
+        /// <inheritdoc />
+        public override string Parameters
+        {
+            get
+            {
+                return null;
+            }
+            set
+            {
+            }
+        }
+
+        /// <inheritdoc />
+        public override void SetKey(AsymmetricAlgorithm privateKey)
+        {
+            if (privateKey == null)
+            {
+                throw ExceptionUtility.ArgumentNull(nameof(privateKey));
+            }
+
+            if (!(privateKey is Gost_R3410_AsymmetricAlgorithmBase<TKeyParams, TKeyAlgorithm> gostPublicKey))
+            {
+                throw ExceptionUtility.ArgumentOutOfRange(nameof(privateKey), Resources.ShouldSupportGost3410);
+            }
+
+            _privateKey = gostPublicKey;
+        }
+
+        /// <inheritdoc />
+        public override byte[] DecryptKeyExchange(byte[] encryptedKeyExchangeData)
+        {
+            var symmetricAlgorithm = DecryptKeyExchangeAlgorithm(encryptedKeyExchangeData);
+
+            return symmetricAlgorithm.Key;
+        }
+
+        /// <inheritdoc />
+        public override SymmetricAlgorithm DecryptKeyExchangeAlgorithm(byte[] encryptedKeyExchangeData)
+        {
+            if (encryptedKeyExchangeData == null)
+            {
+                throw ExceptionUtility.ArgumentNull(nameof(encryptedKeyExchangeData));
+            }
+
+            var keyExchange = new TKey();
+            keyExchange.Decode(encryptedKeyExchangeData);
+
+            return DecryptKeyExchangeAlgorithm(keyExchange);
+        }
+
+        private SymmetricAlgorithm DecryptKeyExchangeAlgorithm(TKey encryptedKeyExchangeInfo)
+        {
+            if (encryptedKeyExchangeInfo == null)
+            {
+                throw ExceptionUtility.ArgumentNull(nameof(encryptedKeyExchangeInfo));
+            }
+
+            var keyExchangeParameters = (TKeyParams)encryptedKeyExchangeInfo.TransportParameters;
+            var keyExchangeAlg = _privateKey.CreateKeyExchange(keyExchangeParameters);
+            var encodedKeyExchangeInfo = encryptedKeyExchangeInfo.SessionEncryptedKey.Encode();
+
+            return keyExchangeAlg.DecodeKeyExchange(encodedKeyExchangeInfo, GostKeyExchangeExportMethod.CryptoProKeyExport);
+        }
+    }
+}