private static string KeyParametersToXml(GostKeyExchangeParameters parameters)
{
var builder = new StringBuilder().AppendFormat("<{0}>", KeyValueXmlTag);
if ((parameters.DigestParamSet != null) || (parameters.EncryptionParamSet != null) || (parameters.PublicKeyParamSet != null))
{
builder.AppendFormat("<{0}>", PublicKeyParametersXmlTag);
builder.AppendFormat("<{0}>{1}{2}</{0}>", PublicKeyParamSetXmlTag, UrnOidXmlTerm, parameters.PublicKeyParamSet);
builder.AppendFormat("<{0}>{1}{2}</{0}>", DigestParamSetXmlTag, UrnOidXmlTerm, parameters.DigestParamSet);
if (parameters.EncryptionParamSet != null)
{
builder.AppendFormat("<{0}>{1}{2}</{0}>", EncryptionParamSetXmlTag, UrnOidXmlTerm, parameters.EncryptionParamSet);
}
builder.AppendFormat("</{0}>", PublicKeyParametersXmlTag);
}
builder.AppendFormat("<{0}>{1}</{0}>", PublicKeyXmlTag, Convert.ToBase64String(parameters.PublicKey));
if (parameters.PrivateKey != null)
{
builder.AppendFormat("<{0}>{1}</{0}>", PrivateKeyXmlTag, Convert.ToBase64String(parameters.PublicKey));
}
builder.AppendFormat("</{0}>", KeyValueXmlTag);
return(builder.ToString());
}
private static GostKeyExchangeParameters DecodePublicBlob(byte[] encodedPublicBlob, GostAlgorithmType algorithm)
{
if (encodedPublicBlob == null)
{
throw ExceptionUtility.ArgumentNull("encodedPublicBlob");
}
int size;
switch (algorithm)
{
case GostAlgorithmType.Gost2001:
size = 512;
break;
case GostAlgorithmType.Gost2012_256:
size = 512;
break;
case GostAlgorithmType.Gost2012_512:
size = 1024;
break;
default:
throw new CryptographicException(Resources.AlgorithmNotAvailable);
}
if (encodedPublicBlob.Length < 16 + size / 8)
{
throw ExceptionUtility.CryptographicException(Constants.NTE_BAD_DATA);
}
var gostKeyMask = BitConverter.ToUInt32(encodedPublicBlob, 8);
if (gostKeyMask != Constants.GR3410_1_MAGIC)
{
throw ExceptionUtility.CryptographicException(Constants.NTE_BAD_DATA);
}
var gostKeySize = BitConverter.ToUInt32(encodedPublicBlob, 12);
if (gostKeySize != size)
{
throw ExceptionUtility.CryptographicException(Constants.NTE_BAD_DATA);
}
var publicKeyParameters = new GostKeyExchangeParameters();
var encodeKeyParameters = new byte[(encodedPublicBlob.Length - 16) - size / 8];
Array.Copy(encodedPublicBlob, 16, encodeKeyParameters, 0, (encodedPublicBlob.Length - 16) - size / 8);
publicKeyParameters.DecodeParameters(encodeKeyParameters);
var publicKey = new byte[64];
Array.Copy(encodedPublicBlob, encodedPublicBlob.Length - size / 8, publicKey, 0, size / 8);
publicKeyParameters.PublicKey = publicKey;
return(publicKeyParameters);
}
public GostKeyExchangeParameters(GostKeyExchangeParameters parameters)
{
DigestParamSet = parameters.DigestParamSet;
PublicKeyParamSet = parameters.PublicKeyParamSet;
EncryptionParamSet = parameters.EncryptionParamSet;
PublicKey = parameters.PublicKey;
PrivateKey = parameters.PrivateKey;
}
public Gost3410EphemeralAsymmetricAlgorithm(GostKeyExchangeParameters keyParameters)
{
if (keyParameters == null)
{
throw ExceptionUtility.ArgumentNull("keyParameters");
}
_provHandle = CryptoApiHelper.ProviderHandle.DangerousAddRef();
_keyHandle = CryptoApiHelper.GenerateDhEphemeralKey(_provHandle, Constants.CALG_DH_EL_EPHEM, keyParameters.DigestParamSet, keyParameters.PublicKeyParamSet);
}
public override GostSharedSecret CreateKeyExchange(GostKeyExchangeParameters keyParameters)
{
GostSharedSecret res = null;
UsingKey(h =>
{
res = new GostSharedSecretAlgorithm(_providerHandle, h, new GostKeyExchangeParameters(keyParameters), GostAlgorithmType.Gost2012_512);
});
return(res);
}
public override void ImportParameters(GostKeyExchangeParameters keyParameters)
{
if (keyParameters.PrivateKey != null)
{
throw ExceptionUtility.NotSupported(Resources.UserImportBulkKeyNotSupported);
}
_keyHandleFunc = () =>
{
return(CryptoApiHelper.ImportPublicKey(_providerHandle, new GostKeyExchangeParameters(keyParameters), GostAlgorithmType.Gost2012_512));
};
}
public override void ImportParameters(GostKeyExchangeParameters keyParameters)
{
if (keyParameters.PrivateKey != null)
{
throw ExceptionUtility.NotSupported(Resources.UserImportBulkKeyNotSupported);
}
_keyHandle.TryDispose();
_providerHandle = CryptoApiHelper.ProviderHandle;
_keyHandle = CryptoApiHelper.ImportPublicKey(_providerHandle, new GostKeyExchangeParameters(keyParameters));
_isPublicKeyOnly = true;
}
public override GostKeyExchangeParameters ExportParameters(bool includePrivateKey)
{
if (includePrivateKey)
{
throw new NotSupportedException();
}
GostKeyExchangeParameters res = null;
UsingKey(h =>
{
res = CryptoApiHelper.ExportPublicKey(h, GostAlgorithmType.Gost2012_512);
});
return(res);
}
public byte[] EncodeParameters()
{
byte[] data;
var publicKeyParameters = new Gost3410PublicKeyParameters();
publicKeyParameters.DigestParamSet = Asn1ObjectIdentifier.FromOidString(_digestParamSet);
publicKeyParameters.PublicKeyParamSet = Asn1ObjectIdentifier.FromOidString(_publicKeyParamSet);
publicKeyParameters.EncryptionParamSet = GostKeyExchangeParameters.CreateEncryptionParamSet(_encryptionParamSet);
var asnEncoder = new Asn1BerEncodeBuffer();
publicKeyParameters.Encode(asnEncoder);
data = asnEncoder.MsgCopy;
return(data);
}
public static byte[] EncodePublicBlob(GostKeyExchangeParameters publicKeyParameters, GostAlgorithmType algorithm)
{
if (publicKeyParameters == null)
{
throw ExceptionUtility.ArgumentNull("publicKeyParameters");
}
int size;
int value;
switch (algorithm)
{
case GostAlgorithmType.Gost2001:
size = 512;
value = Constants.CALG_GR3410EL;
break;
case GostAlgorithmType.Gost2012_256:
size = 512;
value = Constants.CALG_GR3410_2012_256;
break;
case GostAlgorithmType.Gost2012_512:
size = 1024;
value = Constants.CALG_GR3410_2012_512;
break;
default:
throw new CryptographicException(Resources.AlgorithmNotAvailable);
}
var encodeKeyParameters = publicKeyParameters.EncodeParameters();
var importedKeyBytes = new byte[(encodeKeyParameters.Length + 16) + publicKeyParameters.PublicKey.Length];
importedKeyBytes[0] = 6;
importedKeyBytes[1] = 32;
Array.Copy(BitConverter.GetBytes(value), 0, importedKeyBytes, 4, 4);
Array.Copy(BitConverter.GetBytes(Constants.GR3410_1_MAGIC), 0, importedKeyBytes, 8, 4);
Array.Copy(BitConverter.GetBytes(size), 0, importedKeyBytes, 12, 4);
Array.Copy(encodeKeyParameters, 0, importedKeyBytes, 16, encodeKeyParameters.Length);
Array.Copy(publicKeyParameters.PublicKey, 0, importedKeyBytes, encodeKeyParameters.Length + 16, publicKeyParameters.PublicKey.Length);
return(importedKeyBytes);
}
public static byte[] EncodePublicBlob(GostKeyExchangeParameters publicKeyParameters)
{
if (publicKeyParameters == null)
{
throw new Exception("ArgumentNull - publicKeyParameters");
}
var encodeKeyParameters = publicKeyParameters.EncodeParameters();
var importedKeyBytes = new byte[(encodeKeyParameters.Length + 16) + publicKeyParameters.PublicKey.Length];
importedKeyBytes[0] = 6;
importedKeyBytes[1] = 32;
Array.Copy(BitConverter.GetBytes(GostConstants.CALG_GR3410EL), 0, importedKeyBytes, 4, 4);
Array.Copy(BitConverter.GetBytes(GostConstants.GR3410_1_MAGIC), 0, importedKeyBytes, 8, 4);
Array.Copy(BitConverter.GetBytes(GostConstants.GOST_3410EL_SIZE), 0, importedKeyBytes, 12, 4);
Array.Copy(encodeKeyParameters, 0, importedKeyBytes, 16, encodeKeyParameters.Length);
Array.Copy(publicKeyParameters.PublicKey, 0, importedKeyBytes, encodeKeyParameters.Length + 16, publicKeyParameters.PublicKey.Length);
return(importedKeyBytes);
}
public static AsymmetricAlgorithm GetPublicKeyAlgorithm(this X509Certificate2 certificate)
{
if (certificate == null)
{
throw ExceptionUtility.ArgumentNull("certificate");
}
var cspObject = new GostKeyExchangeParameters();
cspObject.DecodeParameters(certificate.PublicKey.EncodedParameters.RawData);
cspObject.DecodePublicKey(certificate.PublicKey.EncodedKeyValue.RawData);
var cspBlobData = CryptoApiHelper.EncodePublicBlob(cspObject);
var publicKey = new Gost3410AsymmetricAlgorithm();
publicKey.ImportCspBlob(cspBlobData);
return(publicKey);
}
public GostKeyExchangeAlgorithm(SafeProvHandleImpl provHandle, SafeKeyHandleImpl keyHandle, GostKeyExchangeParameters keyExchangeParameters)
{
if (provHandle == null)
{
throw ExceptionUtility.ArgumentNull("provHandle");
}
if (keyHandle == null)
{
throw ExceptionUtility.ArgumentNull("keyHandle");
}
if (keyExchangeParameters == null)
{
throw ExceptionUtility.ArgumentNull("keyExchangeParameters");
}
_provHandle = provHandle.DangerousAddRef();
_keyHandle = keyHandle.DangerousAddRef();
_keyExchangeParameters = keyExchangeParameters;
}
private static GostKeyExchangeParameters DecodePublicBlob(byte[] encodedPublicBlob)
{
if (encodedPublicBlob == null)
{
throw ExceptionUtility.ArgumentNull("encodedPublicBlob");
}
if (encodedPublicBlob.Length < 80)
{
throw ExceptionUtility.CryptographicException(Constants.NTE_BAD_DATA);
}
var gostKeyMask = BitConverter.ToUInt32(encodedPublicBlob, 8);
if (gostKeyMask != Constants.GR3410_1_MAGIC)
{
throw ExceptionUtility.CryptographicException(Constants.NTE_BAD_DATA);
}
var gostKeySize = BitConverter.ToUInt32(encodedPublicBlob, 12);
if (gostKeySize != 512)
{
throw ExceptionUtility.CryptographicException(Constants.NTE_BAD_DATA);
}
var publicKeyParameters = new GostKeyExchangeParameters();
var encodeKeyParameters = new byte[(encodedPublicBlob.Length - 16) - 64];
Array.Copy(encodedPublicBlob, 16, encodeKeyParameters, 0, (encodedPublicBlob.Length - 16) - 64);
publicKeyParameters.DecodeParameters(encodeKeyParameters);
var publicKey = new byte[64];
Array.Copy(encodedPublicBlob, encodedPublicBlob.Length - 64, publicKey, 0, 64);
publicKeyParameters.PublicKey = publicKey;
return(publicKeyParameters);
}
public static byte[] EncodePublicBlob(GostKeyExchangeParameters publicKeyParameters, int algId)
{
if (publicKeyParameters == null)
{
throw new ArgumentNullException(nameof(publicKeyParameters));
}
int keySize;
if (algId == GostConstants.CALG_GR3410EL)
{
keySize = GostConstants.GOST_3410EL_SIZE;
}
else if (algId == GostConstants.CALG_GR3410_12_256)
{
keySize = GostConstants.GOST3410_2012_256KEY_SIZE;
}
else if (algId == GostConstants.CALG_GR3410_12_512)
{
keySize = GostConstants.GOST3410_2012_512KEY_SIZE;
}
else
{
throw new CryptographicException(
SR.Cryptography_CSP_WrongKeySpec);
}
var encodeKeyParameters = publicKeyParameters.EncodeParameters();
var importedKeyBytes = new byte[(encodeKeyParameters.Length + 16) + publicKeyParameters.PublicKey.Length];
importedKeyBytes[0] = 6;
importedKeyBytes[1] = 32;
Array.Copy(BitConverter.GetBytes(algId), 0, importedKeyBytes, 4, 4);
Array.Copy(BitConverter.GetBytes(GostConstants.GR3410_1_MAGIC), 0, importedKeyBytes, 8, 4);
Array.Copy(BitConverter.GetBytes(keySize), 0, importedKeyBytes, 12, 4);
Array.Copy(encodeKeyParameters, 0, importedKeyBytes, 16, encodeKeyParameters.Length);
Array.Copy(publicKeyParameters.PublicKey, 0, importedKeyBytes, encodeKeyParameters.Length + 16, publicKeyParameters.PublicKey.Length);
return(importedKeyBytes);
}
public static SafeKeyHandleImpl ImportPublicKey(SafeProvHandleImpl providerHandle, GostKeyExchangeParameters publicKeyParameters, GostAlgorithmType algorithm)
{
if (publicKeyParameters == null)
{
throw ExceptionUtility.ArgumentNull("publicKeyParameters");
}
var importedKeyBytes = EncodePublicBlob(publicKeyParameters, algorithm);
SafeKeyHandleImpl hKeyExchange;
ImportCspBlob(importedKeyBytes, providerHandle, SafeKeyHandleImpl.InvalidHandle, out hKeyExchange);
return(hKeyExchange);
}
public override GostSharedSecret CreateKeyExchange(GostKeyExchangeParameters keyParameters)
{
return(new GostSharedSecretAlgorithm(_provHandle, _keyHandle, new GostKeyExchangeParameters(keyParameters), GostAlgorithmType.Gost2001));
}
/// <summary>
/// Разбор BLOB открытого ключа ГОСТ 34.10.
/// </summary>
///
/// <param name="obj">Gost3410CspObject</param>
/// <param name="data">BLOB</param>
/// <param name="alg">Тип алгоритма</param>
///
/// <argnull name="obj" />
/// <exception cref="CryptographicException">Если
/// <paramref name="obj"/> не объект типа
/// <see cref="Gost3410CspObject"/></exception>
///
/// <intdoc><para>Аналог в MS отсутствует, часть реализации
/// присутствует в ImportKey. </para></intdoc>
///
/// <unmanagedperm action="LinkDemand" />
internal static void DecodePublicBlob(Object obj, byte[] data, CspAlgorithmType alg)
{
int keySize;
switch (alg)
{
case CspAlgorithmType.PROV_GOST_2001_DH:
keySize = GostConstants.GOST_3410EL_SIZE;
break;
case CspAlgorithmType.PROV_GOST_2012_256:
keySize = GostConstants.GOST3410_2012_256KEY_SIZE;
break;
case CspAlgorithmType.PROV_GOST_2012_512:
keySize = GostConstants.GOST3410_2012_512KEY_SIZE;
break;
default:
throw new CryptographicException(SR.Cryptography_CSP_WrongKeySpec);
}
if (obj == null)
{
throw new ArgumentNullException("obj");
}
Gost3410CspObject cspObject = obj as Gost3410CspObject;
if (cspObject == null)
{
throw new CryptographicException(GostConstants.NTE_BAD_ALGID);
}
if (data.Length < 16 + keySize / 8)
{
throw new CryptographicException(GostConstants.NTE_BAD_DATA);
}
// CRYPT_PUBKEYPARAM -> 8 { Magic, BitLen )
uint magic = BitConverter.ToUInt32(data, 8);
uint bitlen = BitConverter.ToUInt32(data, 12);
if (magic != GostConstants.GR3410_1_MAGIC)
{
throw new CryptographicException(GostConstants.NTE_BAD_DATA);
}
if (bitlen != keySize)
{
throw new CryptographicException(GostConstants.NTE_BAD_DATA);
}
byte[] tmp = new byte[data.Length - 16 - keySize / 8];
Array.Copy(data, 16, tmp, 0, data.Length - 16 - keySize / 8);
var publicKeyParameters = new GostKeyExchangeParameters();
var encodeKeyParameters = new byte[(data.Length - 16) - keySize / 8];
Array.Copy(data, 16, encodeKeyParameters, 0, (data.Length - 16) - keySize / 8);
publicKeyParameters.DecodeParameters(encodeKeyParameters);
var publicKey = new byte[keySize / 8];
Array.Copy(data, data.Length - keySize / 8, publicKey, 0, keySize / 8);
publicKeyParameters.PublicKey = publicKey;
cspObject._publicKey = publicKeyParameters.PublicKey;
cspObject._publicKeyParamSet = publicKeyParameters.PublicKeyParamSet;
cspObject._digestParamSet = publicKeyParameters.DigestParamSet;
}
/// <summary>
/// Импортирует (дешифрует) параметры ключа, используемого для создания общего секретного ключа.
/// </summary>
/// <param name="keyParameters">Параметры ключа, используемого для создания общего секретного ключа.</param>
/// <exception cref="NotSupportedException"></exception>
public override void ImportParameters(GostKeyExchangeParameters keyParameters)
{
throw ExceptionUtility.NotSupported(Resources.EphemKeyOperationNotSupported);
}
public AsymmetricAlgorithm DecodePublicKey(Oid oid, byte[] encodedKeyValue, byte[] encodedParameters, ICertificatePal certificatePal)
{
if (oid.Value == Oids.EcPublicKey && certificatePal != null)
{
return(DecodeECDsaPublicKey((CertificatePal)certificatePal));
}
int algId = Interop.Crypt32.FindOidInfo(CryptOidInfoKeyType.CRYPT_OID_INFO_OID_KEY, oid.Value, OidGroup.PublicKeyAlgorithm, fallBackToAllGroups: true).AlgId;
switch (algId)
{
case AlgId.CALG_RSA_KEYX:
case AlgId.CALG_RSA_SIGN:
{
byte[] keyBlob = DecodeKeyBlob(CryptDecodeObjectStructType.CNG_RSA_PUBLIC_KEY_BLOB, encodedKeyValue);
CngKey cngKey = CngKey.Import(keyBlob, CngKeyBlobFormat.GenericPublicBlob);
return(new RSACng(cngKey));
}
//begin: gost
case AlgId.CALG_GOST3410:
{
var cspObject = new GostKeyExchangeParameters();
cspObject.DecodeParameters(encodedParameters);
cspObject.DecodePublicKey(encodedKeyValue, algId);
var cspBlobData = GostKeyExchangeParameters.EncodePublicBlob(cspObject, algId);
Gost3410CryptoServiceProvider gost_sp = new Gost3410CryptoServiceProvider();
gost_sp.ImportCspBlob(cspBlobData);
return(gost_sp);
}
case AlgId.CALG_GOST3410_2012_256:
{
var cspObject = new GostKeyExchangeParameters();
cspObject.DecodeParameters(encodedParameters);
cspObject.DecodePublicKey(encodedKeyValue, algId);
var cspBlobData = GostKeyExchangeParameters.EncodePublicBlob(cspObject, algId);
Gost3410_2012_256CryptoServiceProvider gost_sp = new Gost3410_2012_256CryptoServiceProvider();
gost_sp.ImportCspBlob(cspBlobData);
return(gost_sp);
}
case AlgId.CALG_GOST3410_2012_512:
{
var cspObject = new GostKeyExchangeParameters();
cspObject.DecodeParameters(encodedParameters);
cspObject.DecodePublicKey(encodedKeyValue, algId);
var cspBlobData = GostKeyExchangeParameters.EncodePublicBlob(cspObject, algId);
Gost3410_2012_512CryptoServiceProvider gost_sp = new Gost3410_2012_512CryptoServiceProvider();
gost_sp.ImportCspBlob(cspBlobData);
return(gost_sp);
}
//end: gost
case AlgId.CALG_DSS_SIGN:
{
byte[] keyBlob = ConstructDSSPublicKeyCspBlob(encodedKeyValue, encodedParameters);
DSACryptoServiceProvider dsa = new DSACryptoServiceProvider();
dsa.ImportCspBlob(keyBlob);
return(dsa);
}
default:
throw new NotSupportedException(SR.NotSupported_KeyAlgorithm);
}
}
/// <summary> /// Импортирует (дешифрует) параметры ключа, используемого для создания общего секретного ключа. /// </summary> /// <param name="keyParameters">Параметры ключа, используемого для создания общего секретного ключа.</param> public abstract void ImportParameters(GostKeyExchangeParameters keyParameters);
private static GostKeyExchangeParameters KeyParametersFromXml(string keyParametersXml)
{
var parameters = new GostKeyExchangeParameters();
var keyValue = SecurityElement.FromString(keyParametersXml);
if (keyValue == null)
{
throw ExceptionUtility.CryptographicException(Resources.InvalidFromXmlString, KeyValueXmlTag);
}
keyValue = SelectChildElement(keyValue, KeyValueXmlTag) ?? keyValue;
var publicKeyParameters = SelectChildElement(keyValue, PublicKeyParametersXmlTag);
if (publicKeyParameters != null)
{
var publicKeyParamSet = RemoveWhiteSpaces(SelectChildElementText(publicKeyParameters, PublicKeyParamSetXmlTag, false));
if (!publicKeyParamSet.StartsWith(UrnOidXmlTerm, StringComparison.OrdinalIgnoreCase))
{
throw ExceptionUtility.CryptographicException(Resources.InvalidFromXmlString, PublicKeyParamSetXmlTag);
}
parameters.PublicKeyParamSet = publicKeyParamSet.Substring(UrnOidXmlTerm.Length);
var digestParamSet = RemoveWhiteSpaces(SelectChildElementText(publicKeyParameters, DigestParamSetXmlTag, false));
if (!digestParamSet.StartsWith(UrnOidXmlTerm, StringComparison.OrdinalIgnoreCase))
{
throw ExceptionUtility.CryptographicException(Resources.InvalidFromXmlString, DigestParamSetXmlTag);
}
parameters.DigestParamSet = digestParamSet.Substring(UrnOidXmlTerm.Length);
var encryptionParamSet = SelectChildElementText(publicKeyParameters, EncryptionParamSetXmlTag, true);
if (!string.IsNullOrEmpty(encryptionParamSet))
{
encryptionParamSet = RemoveWhiteSpaces(encryptionParamSet);
if (!encryptionParamSet.StartsWith(UrnOidXmlTerm, StringComparison.OrdinalIgnoreCase))
{
throw ExceptionUtility.CryptographicException(Resources.InvalidFromXmlString, EncryptionParamSetXmlTag);
}
parameters.EncryptionParamSet = encryptionParamSet.Substring(UrnOidXmlTerm.Length);
}
}
var publicKey = SelectChildElementText(keyValue, PublicKeyXmlTag, false);
parameters.PublicKey = Convert.FromBase64String(RemoveWhiteSpaces(publicKey));
var privateKey = SelectChildElementText(keyValue, PrivateKeyXmlTag, true);
if (privateKey != null)
{
parameters.PrivateKey = Convert.FromBase64String(RemoveWhiteSpaces(privateKey));
}
return(parameters);
}
public override GostKeyExchangeAlgorithmBase CreateKeyExchange(GostKeyExchangeParameters keyParameters)
{
return(new GostKeyExchangeAlgorithm(_provHandle, _keyHandle, new GostKeyExchangeParameters(keyParameters)));
}
/// <summary> /// Создает общий секретный ключ. /// </summary> /// <param name="keyParameters">Параметры открытого ключа, используемого для создания общего секретного ключа.</param> public abstract GostSharedSecret CreateKeyExchange(GostKeyExchangeParameters keyParameters);
public static SafeKeyHandleImpl ImportAndMakeKeyExchange(SafeProvHandleImpl providerHandle, GostKeyExchangeParameters keyExchangeParameters, SafeKeyHandleImpl publicKeyHandle, GostAlgorithmType alg)
{
if (keyExchangeParameters == null)
{
throw ExceptionUtility.ArgumentNull("keyExchangeParameters");
}
var importedKeyBytes = EncodePublicBlob(keyExchangeParameters, alg);
SafeKeyHandleImpl keyExchangeHandle;
ImportCspBlob(importedKeyBytes, providerHandle, publicKeyHandle, out keyExchangeHandle);
return(keyExchangeHandle);
}
/// <summary> /// Создает общий секретный ключ. /// </summary> /// <param name="keyParameters">Параметры открытого ключа, используемого для создания общего секретного ключа.</param> public abstract GostKeyExchangeAlgorithmBase CreateKeyExchange(GostKeyExchangeParameters keyParameters);
