Exemple #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)
            {
                throw new IOException("invalid ECDSA sig");
            }

            if ((tag & Asn1Tags.Tagged) != 0)
            {
                throw new IOException("invalid ECDSA sig");
            }

            if (isConstructed)
            {
                switch (tagNo)
                {
                case Asn1Tags.Sequence:
                    return(CreateDerSequence(defIn));

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

            return(CreatePrimitiveDerObject(tagNo, defIn, tmpBuffers));
        }
Exemple #2
0
        internal static Asn1Object CreatePrimitiveDerObject(
            int tagNo,
            DefiniteLengthInputStream defIn,
            byte[][] tmpBuffers)
        {
            switch (tagNo)
            {
            case Asn1Tags.Boolean:
                throw new IOException("invalid ECDSA sig");

            case Asn1Tags.Enumerated:
                throw new IOException("invalid ECDSA sig");

            case Asn1Tags.ObjectIdentifier:
                throw new IOException("invalid ECDSA sig");
            }

            byte[] bytes = defIn.ToArray();

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

            default:
                throw new IOException("unknown tag " + tagNo + " encountered");
            }
        }
Exemple #3
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);
        }
Exemple #4
0
 internal virtual DerSequence CreateDerSequence(
     DefiniteLengthInputStream dIn)
 {
     return(DerSequence.FromVector(BuildDerEncodableVector(dIn)));
 }
Exemple #5
0
 internal virtual Asn1EncodableVector BuildDerEncodableVector(
     DefiniteLengthInputStream dIn)
 {
     return(new Asn1InputStream(dIn).BuildEncodableVector());
 }