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Diffstat (limited to 'Crypto/src/asn1/DERExternal.cs')
| -rw-r--r-- | Crypto/src/asn1/DERExternal.cs | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/Crypto/src/asn1/DERExternal.cs b/Crypto/src/asn1/DERExternal.cs new file mode 100644 index 000000000..a342d6520 --- /dev/null +++ b/Crypto/src/asn1/DERExternal.cs @@ -0,0 +1,207 @@ +using System; +using System.IO; + +using Org.BouncyCastle.Utilities; + +namespace Org.BouncyCastle.Asn1 +{ + /** + * Class representing the DER-type External + */ + public class DerExternal + : Asn1Object + { + private DerObjectIdentifier directReference; + private DerInteger indirectReference; + private Asn1Object dataValueDescriptor; + private int encoding; + private Asn1Object externalContent; + + public DerExternal( + Asn1EncodableVector vector) + { + int offset = 0; + Asn1Object enc = GetObjFromVector(vector, offset); + if (enc is DerObjectIdentifier) + { + directReference = (DerObjectIdentifier)enc; + offset++; + enc = GetObjFromVector(vector, offset); + } + if (enc is DerInteger) + { + indirectReference = (DerInteger) enc; + offset++; + enc = GetObjFromVector(vector, offset); + } + if (!(enc is DerTaggedObject)) + { + dataValueDescriptor = (Asn1Object) enc; + offset++; + enc = GetObjFromVector(vector, offset); + } + if (!(enc is DerTaggedObject)) + { + throw new InvalidOperationException( + "No tagged object found in vector. Structure doesn't seem to be of type External"); + } + + if (vector.Count != offset + 1) + throw new ArgumentException("input vector too large", "vector"); + + if (!(enc is DerTaggedObject)) + throw new ArgumentException("No tagged object found in vector. Structure doesn't seem to be of type External", "vector"); + + DerTaggedObject obj = (DerTaggedObject)enc; + + // Use property accessor to include check on value + Encoding = obj.TagNo; + + if (encoding < 0 || encoding > 2) + throw new InvalidOperationException("invalid encoding value"); + + externalContent = obj.GetObject(); + } + + /** + * Creates a new instance of DerExternal + * See X.690 for more informations about the meaning of these parameters + * @param directReference The direct reference or <code>null</code> if not set. + * @param indirectReference The indirect reference or <code>null</code> if not set. + * @param dataValueDescriptor The data value descriptor or <code>null</code> if not set. + * @param externalData The external data in its encoded form. + */ + public DerExternal(DerObjectIdentifier directReference, DerInteger indirectReference, Asn1Object dataValueDescriptor, DerTaggedObject externalData) + : this(directReference, indirectReference, dataValueDescriptor, externalData.TagNo, externalData.ToAsn1Object()) + { + } + + /** + * Creates a new instance of DerExternal. + * See X.690 for more informations about the meaning of these parameters + * @param directReference The direct reference or <code>null</code> if not set. + * @param indirectReference The indirect reference or <code>null</code> if not set. + * @param dataValueDescriptor The data value descriptor or <code>null</code> if not set. + * @param encoding The encoding to be used for the external data + * @param externalData The external data + */ + public DerExternal(DerObjectIdentifier directReference, DerInteger indirectReference, Asn1Object dataValueDescriptor, int encoding, Asn1Object externalData) + { + DirectReference = directReference; + IndirectReference = indirectReference; + DataValueDescriptor = dataValueDescriptor; + Encoding = encoding; + ExternalContent = externalData.ToAsn1Object(); + } + + internal override void Encode(DerOutputStream derOut) + { + MemoryStream ms = new MemoryStream(); + WriteEncodable(ms, directReference); + WriteEncodable(ms, indirectReference); + WriteEncodable(ms, dataValueDescriptor); + WriteEncodable(ms, new DerTaggedObject(Asn1Tags.External, externalContent)); + + derOut.WriteEncoded(Asn1Tags.Constructed, Asn1Tags.External, ms.ToArray()); + } + + protected override int Asn1GetHashCode() + { + int ret = externalContent.GetHashCode(); + if (directReference != null) + { + ret ^= directReference.GetHashCode(); + } + if (indirectReference != null) + { + ret ^= indirectReference.GetHashCode(); + } + if (dataValueDescriptor != null) + { + ret ^= dataValueDescriptor.GetHashCode(); + } + return ret; + } + + protected override bool Asn1Equals( + Asn1Object asn1Object) + { + if (this == asn1Object) + return true; + + DerExternal other = asn1Object as DerExternal; + + if (other == null) + return false; + + return Platform.Equals(directReference, other.directReference) + && Platform.Equals(indirectReference, other.indirectReference) + && Platform.Equals(dataValueDescriptor, other.dataValueDescriptor) + && externalContent.Equals(other.externalContent); + } + + public Asn1Object DataValueDescriptor + { + get { return dataValueDescriptor; } + set { this.dataValueDescriptor = value; } + } + + public DerObjectIdentifier DirectReference + { + get { return directReference; } + set { this.directReference = value; } + } + + /** + * The encoding of the content. Valid values are + * <ul> + * <li><code>0</code> single-ASN1-type</li> + * <li><code>1</code> OCTET STRING</li> + * <li><code>2</code> BIT STRING</li> + * </ul> + */ + public int Encoding + { + get + { + return encoding; + } + set + { + if (encoding < 0 || encoding > 2) + throw new InvalidOperationException("invalid encoding value: " + encoding); + + this.encoding = value; + } + } + + public Asn1Object ExternalContent + { + get { return externalContent; } + set { this.externalContent = value; } + } + + public DerInteger IndirectReference + { + get { return indirectReference; } + set { this.indirectReference = value; } + } + + private static Asn1Object GetObjFromVector(Asn1EncodableVector v, int index) + { + if (v.Count <= index) + throw new ArgumentException("too few objects in input vector", "v"); + + return v[index].ToAsn1Object(); + } + + private static void WriteEncodable(MemoryStream ms, Asn1Encodable e) + { + if (e != null) + { + byte[] bs = e.GetDerEncoded(); + ms.Write(bs, 0, bs.Length); + } + } + } +} |