105 lines
3.9 KiB
C#
105 lines
3.9 KiB
C#
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);
|
||
}
|
||
}
|
||
}
|