/// <summary>
/// Декодирование ASN.1 структуры транспорта.
/// </summary>
///
/// <param name="data">ASN.1 закодированная структура.</param>
/// <param name="transport">ГОСТ Р 34.10 транспорт.</param>
///
/// <argnull name="data" />
/// <exception cref="CryptographicException">При ошибках
/// декодирования исходной структуры.</exception>
public static void DecodeGostKeyTransport(byte[] data,
GostKeyTransportObject transport)
{
if (data == null)
{
throw new ArgumentNullException("data");
}
if (transport == null)
{
throw new ArgumentNullException("transport");
}
try
{
Asn1BerDecodeBuffer buffer = new Asn1BerDecodeBuffer(data);
GostR3410_KeyTransport asnTransport =
new GostR3410_KeyTransport();
asnTransport.Decode(buffer);
transport.sessionEncryptedKey_ = new GostWrappedKeyObject();
transport.sessionEncryptedKey_._encryptedKey =
asnTransport.sessionEncryptedKey.encryptedKey.Value;
transport.sessionEncryptedKey_._mac =
asnTransport.sessionEncryptedKey.macKey.Value;
transport.sessionEncryptedKey_._ukm =
asnTransport.transportParameters.ukm.Value;
transport.sessionEncryptedKey_._encryptionParamSet =
toString(asnTransport.transportParameters.encryptionParamSet);
// Для корректной ошибки, а не ArgumentException
string algoid = toString(
asnTransport.transportParameters.ephemeralPublicKey.
algorithm.algorithm);
if (algoid.Equals(GostConstants.OID_CP_GOST_R3410EL))
{
transport.transportParameters_ = UnpackPublicKeyInfo2001(
asnTransport.transportParameters.ephemeralPublicKey);
}
else if (algoid.Equals(GostConstants.OID_CP_GOST_R3410_12_256) ||
(algoid.Equals(GostConstants.OID_CP_GOST_R3410_12_512)))
{
transport.transportParameters_ = UnpackPublicKeyInfo2012(
asnTransport.transportParameters.ephemeralPublicKey);
}
else
{
throw new CryptographicException(
"Resources.Cryptography_ASN1_Decode_Alg " + algoid);
}
}
catch (Exception e)
{
throw new CryptographicException(
"Resources.Cryptography_ASN1_DecodeWithException " +
"GostR3410_KeyTransport", e);
}
}
/// <summary>
/// ASN.1 кодирование структуры транспорта.
/// </summary>
///
/// <param name="transport">ASN.1 транспорт.</param>
///
/// <returns>Закодированная структура.</returns>
///
/// <argnull name="transport" />
/// <exception cref="CryptographicException">При ошибках
/// кодирования исходной структуры.</exception>
public static byte[] EncodeGostKeyTransport(
GostKeyTransportObject transport)
{
if (transport == null)
{
throw new ArgumentNullException("transport");
}
GostR3410_KeyTransport asnTransport =
new GostR3410_KeyTransport();
Asn1BerEncodeBuffer buffer = new Asn1BerEncodeBuffer();
try
{
asnTransport.sessionEncryptedKey =
new Gost28147_89_EncryptedKey();
asnTransport.sessionEncryptedKey.encryptedKey =
new Gost28147_89_Key(
transport.sessionEncryptedKey_._encryptedKey);
asnTransport.sessionEncryptedKey.macKey =
new Gost28147_89_MAC(transport.sessionEncryptedKey_._mac);
asnTransport.transportParameters =
new GostR3410_TransportParameters();
asnTransport.transportParameters.ukm =
new Asn1OctetString(transport.sessionEncryptedKey_._ukm);
asnTransport.transportParameters.encryptionParamSet =
CreateGost28147_89_ParamSet(
transport.sessionEncryptedKey_._encryptionParamSet);
if (transport.Transport.TransportParameters.DigestParamSet == "1.2.643.2.2.30.1")
{
asnTransport.transportParameters.ephemeralPublicKey =
PackPublicKeyInfo2001(transport.transportParameters_);
}
else if (transport.Transport.TransportParameters.DigestParamSet == "1.2.643.7.1.1.2.2")
{
asnTransport.transportParameters.ephemeralPublicKey =
PackPublicKeyInfo2012_256(transport.transportParameters_);
}
else if (transport.Transport.TransportParameters.DigestParamSet == "1.2.643.7.1.1.2.3")
{
asnTransport.transportParameters.ephemeralPublicKey =
PackPublicKeyInfo2012_512(transport.transportParameters_);
}
asnTransport.Encode(buffer);
}
catch (Exception e)
{
throw new CryptographicException(
"Resources.Cryptography_ASN1_EncodeWithException " +
"GostR3410_KeyTransport", e);
}
return(buffer.MsgCopy);
}
