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using System;
using System.IO;
using Org.BouncyCastle.Utilities;
using Org.BouncyCastle.Utilities.Encoders;
namespace Org.BouncyCastle.Asn1
{
public abstract class Asn1OctetString
: Asn1Object, Asn1OctetStringParser
{
internal static readonly byte[] EmptyOctets = new byte[0];
/**
* return an Octet string from the given object.
*
* @param obj the object we want converted.
* @exception ArgumentException if the object cannot be converted.
*/
public static Asn1OctetString GetInstance(object obj)
{
if (obj == null || obj is Asn1OctetString)
{
return (Asn1OctetString)obj;
}
//else if (obj is Asn1OctetStringParser)
else if (obj is IAsn1Convertible)
{
Asn1Object asn1Object = ((IAsn1Convertible)obj).ToAsn1Object();
if (asn1Object is Asn1OctetString)
{
return (Asn1OctetString)asn1Object;
}
}
else if (obj is byte[])
{
try
{
return GetInstance(FromByteArray((byte[])obj));
}
catch (IOException e)
{
throw new ArgumentException("failed to construct OCTET STRING from byte[]: " + e.Message);
}
}
throw new ArgumentException("illegal object in GetInstance: " + Platform.GetTypeName(obj), "obj");
}
/**
* return an Octet string from a tagged object.
*
* @param obj the tagged object holding the object we want.
* @param explicitly true if the object is meant to be explicitly
* tagged false otherwise.
* @exception ArgumentException if the tagged object cannot
* be converted.
*/
public static Asn1OctetString GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit)
{
if (declaredExplicit)
{
if (!taggedObject.IsExplicit())
throw new ArgumentException("object implicit - explicit expected.");
return GetInstance(taggedObject.GetObject());
}
Asn1Object baseObject = taggedObject.GetObject();
// If parsed as explicit though declared implicit, it should have been a set of one
if (taggedObject.IsExplicit())
{
Asn1OctetString singleSegment = GetInstance(baseObject);
if (taggedObject is BerTaggedObject)
return new BerOctetString(new Asn1OctetString[]{ singleSegment });
return singleSegment;
}
if (baseObject is Asn1OctetString)
return (Asn1OctetString)baseObject;
// Parser assumes implicit constructed encodings are sequences
if (baseObject is Asn1Sequence)
return ((Asn1Sequence)baseObject).ToAsn1OctetString();
throw new ArgumentException("illegal object in GetInstance: " + Platform.GetTypeName(taggedObject),
"taggedObject");
}
internal readonly byte[] contents;
/**
* @param string the octets making up the octet string.
*/
internal Asn1OctetString(byte[] contents)
{
if (null == contents)
throw new ArgumentNullException("contents");
this.contents = contents;
}
public Stream GetOctetStream()
{
return new MemoryStream(contents, false);
}
public Asn1OctetStringParser Parser
{
get { return this; }
}
public virtual byte[] GetOctets()
{
return contents;
}
protected override int Asn1GetHashCode()
{
return Arrays.GetHashCode(GetOctets());
}
protected override bool Asn1Equals(
Asn1Object asn1Object)
{
DerOctetString other = asn1Object as DerOctetString;
if (other == null)
return false;
return Arrays.AreEqual(GetOctets(), other.GetOctets());
}
public override string ToString()
{
return "#" + Hex.ToHexString(contents);
}
}
}
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