private void Init()
{
EncryptedKey = null;
MacKey = null;
_maskKey = null;
}
public override void Decode(Asn1BerDecodeBuffer buffer, bool explicitTagging, int implicitLength)
{
var elemLength = explicitTagging ? MatchTag(buffer, Asn1Tag.Sequence) : implicitLength;
Init();
var context = new Asn1BerDecodeContext(buffer, elemLength);
var parsedLen = new IntHolder();
if (!context.MatchElemTag(0, 0, OctetStringTypeCode, parsedLen, false))
{
throw ExceptionUtility.CryptographicException(Resources.Asn1MissingRequiredException, buffer.ByteCount);
}
EncryptedKey = new Gost2814789Key();
EncryptedKey.Decode(buffer, true, parsedLen.Value);
if (context.MatchElemTag(0x80, 0, EocTypeCode, parsedLen, true))
{
_maskKey = new Gost2814789Key();
_maskKey.Decode(buffer, false, parsedLen.Value);
}
if (!context.MatchElemTag(0, 0, OctetStringTypeCode, parsedLen, false))
{
throw ExceptionUtility.CryptographicException(Resources.Asn1MissingRequiredException, buffer.ByteCount);
}
MacKey = new Gost2814789Mac();
MacKey.Decode(buffer, true, parsedLen.Value);
if (MacKey.Length != 4)
{
throw ExceptionUtility.CryptographicException(Resources.Asn1ConsVioException, "MacKey.Length", MacKey.Length);
}
}