117 lines
4.9 KiB
C#
117 lines
4.9 KiB
C#
using GostCryptography.Asn1.Gost.Gost_R3410;
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using GostCryptography.Base;
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using GostCryptography.Native;
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using GostCryptography.Properties;
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using System;
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using System.Security;
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using System.Security.Cryptography;
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namespace GostCryptography.Gost_R3410
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{
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/// <summary>
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/// Реализация алгоритма формирования общих ключей на основе алгоритма ГОСТ Р 34.10 и эфимерного ключа
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/// </summary>
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public abstract class Gost_R3410_EphemeralAsymmetricAlgorithm<TKeyParams, TKeyAlgorithm> : Gost_R3410_AsymmetricAlgorithmBase<TKeyParams, TKeyAlgorithm>, ISafeHandleProvider<SafeProvHandleImpl>, ISafeHandleProvider<SafeKeyHandleImpl>
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where TKeyParams : Gost_R3410_KeyExchangeParams
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where TKeyAlgorithm : Gost_R3410_KeyExchangeAlgorithm
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{
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/// <inheritdoc />
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[SecuritySafeCritical]
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protected Gost_R3410_EphemeralAsymmetricAlgorithm(ProviderType providerType, int keySize) : base(providerType, keySize)
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{
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_providerHandle = CryptoApiHelper.GetProviderHandle(ProviderType).DangerousAddRef();
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_keyHandle = CryptoApiHelper.GenerateKey(_providerHandle, ExchangeAlgId, CspProviderFlags.NoFlags);
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}
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/// <summary>
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/// Конструктор
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/// </summary>
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/// <param name="providerType">Тип криптографического провайдера</param>
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/// <param name="keyParameters">Параметры ключа, используемого для создания общего секретного ключа</param>
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/// <param name="keySize">Размер ключа в битах</param>
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/// <exception cref="ArgumentNullException"></exception>
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/// <remarks>
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/// В параметре <paramref name="keyParameters"/> достаточно передать идентификатор OID параметров хэширования
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/// <see cref="Gost_R3410_KeyExchangeParams.DigestParamSet"/> и идентификатор OID параметров открытого ключа
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/// <see cref="Gost_R3410_KeyExchangeParams.PublicKeyParamSet"/>. Остальные параметры не используются.
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/// </remarks>
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[SecuritySafeCritical]
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protected Gost_R3410_EphemeralAsymmetricAlgorithm(ProviderType providerType, TKeyParams keyParameters, int keySize) : base(providerType, keySize)
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{
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if (keyParameters == null)
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{
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throw ExceptionUtility.ArgumentNull(nameof(keyParameters));
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}
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_providerHandle = CryptoApiHelper.GetProviderHandle(ProviderType).DangerousAddRef();
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_keyHandle = CryptoApiHelper.GenerateDhEphemeralKey(providerType, _providerHandle, ExchangeAlgId, keyParameters.DigestParamSet, keyParameters.PublicKeyParamSet);
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}
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[SecurityCritical]
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private readonly SafeProvHandleImpl _providerHandle;
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[SecurityCritical]
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private readonly SafeKeyHandleImpl _keyHandle;
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/// <inheritdoc />
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SafeProvHandleImpl ISafeHandleProvider<SafeProvHandleImpl>.SafeHandle
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{
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[SecurityCritical]
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get => _providerHandle;
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}
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/// <inheritdoc />
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SafeKeyHandleImpl ISafeHandleProvider<SafeKeyHandleImpl>.SafeHandle
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{
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[SecurityCritical]
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get => _keyHandle;
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}
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/// <inheritdoc />
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public override byte[] CreateSignature(byte[] hash)
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{
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throw ExceptionUtility.NotSupported(Resources.EphemKeyOperationNotSupported);
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}
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/// <inheritdoc />
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public override bool VerifySignature(byte[] hash, byte[] signature)
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{
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throw ExceptionUtility.NotSupported(Resources.EphemKeyOperationNotSupported);
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}
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/// <inheritdoc />
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[SecuritySafeCritical]
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public override TKeyAlgorithm CreateKeyExchange(TKeyParams keyParameters)
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{
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return CreateKeyExchangeAlgorithm(ProviderType, _providerHandle, _keyHandle, (TKeyParams)keyParameters.Clone());
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}
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/// <inheritdoc />
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[SecuritySafeCritical]
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public override TKeyParams ExportParameters(bool includePrivateKey)
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{
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if (includePrivateKey)
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{
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throw ExceptionUtility.NotSupported(Resources.EphemKeyOperationNotSupported);
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}
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return CryptoApiHelper.ExportPublicKey(_keyHandle, CreateKeyExchangeParams(), KeySizeValue);
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}
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/// <inheritdoc />
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public override void ImportParameters(TKeyParams keyParameters)
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{
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throw ExceptionUtility.NotSupported(Resources.EphemKeyOperationNotSupported);
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}
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/// <inheritdoc />
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[SecuritySafeCritical]
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protected override void Dispose(bool disposing)
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{
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_keyHandle.TryDispose();
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_providerHandle.TryDispose();
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base.Dispose(disposing);
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}
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}
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}
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