コード例 #1
0
        /**
         * build an object given its tag and the number of bytes to construct it from.
         */
        private Asn1Object BuildObject(
            int tag,
            int tagNo,
            int length)
        {
            bool isConstructed = (tag & Asn1Tags.Constructed) != 0;

            DefiniteLengthInputStream defIn = new DefiniteLengthInputStream(this.s, length);

            if ((tag & Asn1Tags.Application) != 0)
            {
                return(new DerApplicationSpecific(isConstructed, tagNo, defIn.ToArray()));
            }

            if ((tag & Asn1Tags.Tagged) != 0)
            {
                return(new Asn1StreamParser(defIn).ReadTaggedObject(isConstructed, tagNo));
            }

            if (isConstructed)
            {
                // TODO There are other tags that may be constructed (e.g. BitString)
                switch (tagNo)
                {
                case Asn1Tags.OctetString:
                    //
                    // yes, people actually do this...
                    //
                    return(new BerOctetString(BuildDerEncodableVector(defIn)));

                case Asn1Tags.Sequence:
                    return(CreateDerSequence(defIn));

                case Asn1Tags.Set:
                    return(CreateDerSet(defIn));

                case Asn1Tags.External:
                    return(new DerExternal(BuildDerEncodableVector(defIn)));

                default:
                    throw new IOException("unknown tag " + tagNo + " encountered");
                }
            }

            return(CreatePrimitiveDerObject(tagNo, defIn, tmpBuffers));
        }
コード例 #2
0
        internal static byte[] GetBuffer(DefiniteLengthInputStream defIn, byte[][] tmpBuffers)
        {
            int len = defIn.GetRemaining();

            if (len >= tmpBuffers.Length)
            {
                return(defIn.ToArray());
            }

            byte[] buf = tmpBuffers[len];
            if (buf == null)
            {
                buf = tmpBuffers[len] = new byte[len];
            }

            defIn.ReadAllIntoByteArray(buf);

            return(buf);
        }
コード例 #3
0
        internal Asn1Object ReadTaggedObject(bool constructed, int tag)
        {
            if (!constructed)
            {
                // Note: !CONSTRUCTED => IMPLICIT
                DefiniteLengthInputStream defIn = (DefiniteLengthInputStream)_in;
                return(new DerTaggedObject(false, tag, new DerOctetString(defIn.ToArray())));
            }

            Asn1EncodableVector v = ReadVector();

            if (_in is IndefiniteLengthInputStream)
            {
                return(v.Count == 1
                                        ?   new BerTaggedObject(true, tag, v[0])
                                        :   new BerTaggedObject(false, tag, BerSequence.FromVector(v)));
            }

            return(v.Count == 1
                                ?   new DerTaggedObject(true, tag, v[0])
                                :   new DerTaggedObject(false, tag, DerSequence.FromVector(v)));
        }
コード例 #4
0
 internal override DerSet CreateDerSet(
     DefiniteLengthInputStream dIn)
 {
     return(new LazyDerSet(dIn.ToArray()));
 }
コード例 #5
0
        public virtual IAsn1Convertible ReadObject()
        {
            int tag = _in.ReadByte();

            if (tag == -1)
            {
                return(null);
            }

            // turn of looking for "00" while we resolve the tag
            Set00Check(false);

            //
            // calculate tag number
            //
            int tagNo = Asn1InputStream.ReadTagNumber(_in, tag);

            bool isConstructed = (tag & Asn1Tags.Constructed) != 0;

            //
            // calculate length
            //
            int length = Asn1InputStream.ReadLength(_in, _limit);

            if (length < 0)             // indefinite length method
            {
                if (!isConstructed)
                {
                    throw new IOException("indefinite length primitive encoding encountered");
                }

                IndefiniteLengthInputStream indIn = new IndefiniteLengthInputStream(_in, _limit);
                Asn1StreamParser            sp    = new Asn1StreamParser(indIn, _limit);

                if ((tag & Asn1Tags.Application) != 0)
                {
                    return(new BerApplicationSpecificParser(tagNo, sp));
                }

                if ((tag & Asn1Tags.Tagged) != 0)
                {
                    return(new BerTaggedObjectParser(true, tagNo, sp));
                }

                return(sp.ReadIndef(tagNo));
            }
            else
            {
                DefiniteLengthInputStream defIn = new DefiniteLengthInputStream(_in, length);

                if ((tag & Asn1Tags.Application) != 0)
                {
                    return(new DerApplicationSpecific(isConstructed, tagNo, defIn.ToArray()));
                }

                if ((tag & Asn1Tags.Tagged) != 0)
                {
                    return(new BerTaggedObjectParser(isConstructed, tagNo, new Asn1StreamParser(defIn)));
                }

                if (isConstructed)
                {
                    // TODO There are other tags that may be constructed (e.g. BitString)
                    switch (tagNo)
                    {
                    case Asn1Tags.OctetString:
                        //
                        // yes, people actually do this...
                        //
                        return(new BerOctetStringParser(new Asn1StreamParser(defIn)));

                    case Asn1Tags.Sequence:
                        return(new DerSequenceParser(new Asn1StreamParser(defIn)));

                    case Asn1Tags.Set:
                        return(new DerSetParser(new Asn1StreamParser(defIn)));

                    case Asn1Tags.External:
                        return(new DerExternalParser(new Asn1StreamParser(defIn)));

                    default:
                        throw new IOException("unknown tag " + tagNo + " encountered");
                    }
                }

                // Some primitive encodings can be handled by parsers too...
                switch (tagNo)
                {
                case Asn1Tags.OctetString:
                    return(new DerOctetStringParser(defIn));
                }

                try
                {
                    return(Asn1InputStream.CreatePrimitiveDerObject(tagNo, defIn, tmpBuffers));
                }
                catch (ArgumentException e)
                {
                    throw new Asn1Exception("corrupted stream detected", e);
                }
            }
        }
コード例 #6
0
        internal static Asn1Object CreatePrimitiveDerObject(
            int tagNo,
            DefiniteLengthInputStream defIn,
            byte[][]                    tmpBuffers)
        {
            switch (tagNo)
            {
            case Asn1Tags.Boolean:
                return(DerBoolean.FromOctetString(GetBuffer(defIn, tmpBuffers)));

            case Asn1Tags.Enumerated:
                return(DerEnumerated.FromOctetString(GetBuffer(defIn, tmpBuffers)));

            case Asn1Tags.ObjectIdentifier:
                return(DerObjectIdentifier.FromOctetString(GetBuffer(defIn, tmpBuffers)));
            }

            byte[] bytes = defIn.ToArray();

            switch (tagNo)
            {
            case Asn1Tags.BitString:
                return(DerBitString.FromAsn1Octets(bytes));

            case Asn1Tags.BmpString:
                return(new DerBmpString(bytes));

            case Asn1Tags.GeneralizedTime:
                return(new DerGeneralizedTime(bytes));

            case Asn1Tags.GeneralString:
                return(new DerGeneralString(bytes));

            case Asn1Tags.GraphicString:
                return(new DerGraphicString(bytes));

            case Asn1Tags.IA5String:
                return(new DerIA5String(bytes));

            case Asn1Tags.Integer:
                return(new DerInteger(bytes));

            case Asn1Tags.Null:
                return(DerNull.Instance);      // actual content is ignored (enforce 0 length?)

            case Asn1Tags.NumericString:
                return(new DerNumericString(bytes));

            case Asn1Tags.OctetString:
                return(new DerOctetString(bytes));

            case Asn1Tags.PrintableString:
                return(new DerPrintableString(bytes));

            case Asn1Tags.T61String:
                return(new DerT61String(bytes));

            case Asn1Tags.UniversalString:
                return(new DerUniversalString(bytes));

            case Asn1Tags.UtcTime:
                return(new DerUtcTime(bytes));

            case Asn1Tags.Utf8String:
                return(new DerUtf8String(bytes));

            case Asn1Tags.VideotexString:
                return(new DerVideotexString(bytes));

            case Asn1Tags.VisibleString:
                return(new DerVisibleString(bytes));

            default:
                throw new IOException("unknown tag " + tagNo + " encountered");
            }
        }
コード例 #7
0
 internal virtual DerSet CreateDerSet(
     DefiniteLengthInputStream dIn)
 {
     return(DerSet.FromVector(BuildDerEncodableVector(dIn), false));
 }
コード例 #8
0
 internal virtual DerSequence CreateDerSequence(
     DefiniteLengthInputStream dIn)
 {
     return(DerSequence.FromVector(BuildDerEncodableVector(dIn)));
 }
コード例 #9
0
 internal virtual Asn1EncodableVector BuildDerEncodableVector(
     DefiniteLengthInputStream dIn)
 {
     return(new Asn1InputStream(dIn).BuildEncodableVector());
 }
コード例 #10
0
 internal DerOctetStringParser(
     DefiniteLengthInputStream stream)
 {
     this.stream = stream;
 }