Exemple #1
0
        private void Init()
        {
            EncryptedKey = null;
            MacKey       = null;

            _maskKey = null;
        }
Exemple #2
0
        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);
            }
        }