344 lines
11 KiB
344 lines
11 KiB
1 year ago
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#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
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#pragma warning disable
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using System;
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using System.Collections;
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using System.Diagnostics;
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using System.IO;
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#if PORTABLE || NETFX_CORE
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using System.Collections.Generic;
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using System.Linq;
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#endif
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Utilities;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Utilities.Collections;
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namespace BestHTTP.SecureProtocol.Org.BouncyCastle.Asn1
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{
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abstract public class Asn1Set
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: Asn1Object, IEnumerable
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{
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// NOTE: Only non-readonly to support LazyDerSet
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internal Asn1Encodable[] elements;
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/**
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* return an ASN1Set from the given object.
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*
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* @param obj the object we want converted.
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* @exception ArgumentException if the object cannot be converted.
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*/
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public static Asn1Set GetInstance(
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object obj)
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{
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if (obj == null || obj is Asn1Set)
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{
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return (Asn1Set)obj;
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}
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else if (obj is Asn1SetParser)
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{
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return Asn1Set.GetInstance(((Asn1SetParser)obj).ToAsn1Object());
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}
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else if (obj is byte[])
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{
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try
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{
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return Asn1Set.GetInstance(FromByteArray((byte[])obj));
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}
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catch (IOException e)
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{
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throw new ArgumentException("failed to construct set from byte[]: " + e.Message);
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}
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}
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else if (obj is Asn1Encodable)
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{
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Asn1Object primitive = ((Asn1Encodable)obj).ToAsn1Object();
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if (primitive is Asn1Set)
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{
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return (Asn1Set)primitive;
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}
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}
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throw new ArgumentException("Unknown object in GetInstance: " + BestHTTP.SecureProtocol.Org.BouncyCastle.Utilities.Platform.GetTypeName(obj), "obj");
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}
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/**
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* Return an ASN1 set from a tagged object. There is a special
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* case here, if an object appears to have been explicitly tagged on
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* reading but we were expecting it to be implicitly tagged in the
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* normal course of events it indicates that we lost the surrounding
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* set - so we need to add it back (this will happen if the tagged
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* object is a sequence that contains other sequences). If you are
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* dealing with implicitly tagged sets you really <b>should</b>
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* be using this method.
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*
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* @param obj the tagged object.
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* @param explicitly true if the object is meant to be explicitly tagged
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* false otherwise.
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* @exception ArgumentException if the tagged object cannot
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* be converted.
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*/
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public static Asn1Set GetInstance(
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Asn1TaggedObject obj,
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bool explicitly)
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{
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Asn1Object inner = obj.GetObject();
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if (explicitly)
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{
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if (!obj.IsExplicit())
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throw new ArgumentException("object implicit - explicit expected.");
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return (Asn1Set) inner;
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}
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//
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// constructed object which appears to be explicitly tagged
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// and it's really implicit means we have to add the
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// surrounding sequence.
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//
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if (obj.IsExplicit())
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{
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return new DerSet(inner);
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}
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if (inner is Asn1Set)
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{
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return (Asn1Set) inner;
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}
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//
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// in this case the parser returns a sequence, convert it
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// into a set.
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//
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if (inner is Asn1Sequence)
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{
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Asn1EncodableVector v = new Asn1EncodableVector();
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Asn1Sequence s = (Asn1Sequence) inner;
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foreach (Asn1Encodable ae in s)
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{
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v.Add(ae);
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}
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// TODO Should be able to construct set directly from sequence?
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return new DerSet(v, false);
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}
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throw new ArgumentException("Unknown object in GetInstance: " + BestHTTP.SecureProtocol.Org.BouncyCastle.Utilities.Platform.GetTypeName(obj), "obj");
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}
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protected internal Asn1Set()
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{
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this.elements = Asn1EncodableVector.EmptyElements;
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}
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protected internal Asn1Set(Asn1Encodable element)
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{
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if (null == element)
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throw new ArgumentNullException("element");
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this.elements = new Asn1Encodable[]{ element };
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}
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protected internal Asn1Set(params Asn1Encodable[] elements)
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{
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if (Arrays.IsNullOrContainsNull(elements))
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throw new NullReferenceException("'elements' cannot be null, or contain null");
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this.elements = Asn1EncodableVector.CloneElements(elements);
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}
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protected internal Asn1Set(Asn1EncodableVector elementVector)
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{
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if (null == elementVector)
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throw new ArgumentNullException("elementVector");
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this.elements = elementVector.TakeElements();
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}
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public virtual IEnumerator GetEnumerator()
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{
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return elements.GetEnumerator();
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}
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/**
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* return the object at the set position indicated by index.
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*
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* @param index the set number (starting at zero) of the object
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* @return the object at the set position indicated by index.
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*/
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public virtual Asn1Encodable this[int index]
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{
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get { return elements[index]; }
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}
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public virtual int Count
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{
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get { return elements.Length; }
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}
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public virtual Asn1Encodable[] ToArray()
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{
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return Asn1EncodableVector.CloneElements(elements);
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}
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private class Asn1SetParserImpl
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: Asn1SetParser
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{
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private readonly Asn1Set outer;
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private readonly int max;
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private int index;
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public Asn1SetParserImpl(
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Asn1Set outer)
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{
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this.outer = outer;
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this.max = outer.Count;
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}
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public IAsn1Convertible ReadObject()
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{
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if (index == max)
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return null;
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Asn1Encodable obj = outer[index++];
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if (obj is Asn1Sequence)
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return ((Asn1Sequence)obj).Parser;
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if (obj is Asn1Set)
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return ((Asn1Set)obj).Parser;
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// NB: Asn1OctetString implements Asn1OctetStringParser directly
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// if (obj is Asn1OctetString)
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// return ((Asn1OctetString)obj).Parser;
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return obj;
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}
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public virtual Asn1Object ToAsn1Object()
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{
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return outer;
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}
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}
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public Asn1SetParser Parser
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{
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get { return new Asn1SetParserImpl(this); }
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}
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protected override int Asn1GetHashCode()
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{
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//return Arrays.GetHashCode(elements);
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int i = elements.Length;
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int hc = i + 1;
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while (--i >= 0)
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{
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hc *= 257;
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hc ^= elements[i].ToAsn1Object().CallAsn1GetHashCode();
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}
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return hc;
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}
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protected override bool Asn1Equals(Asn1Object asn1Object)
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{
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Asn1Set that = asn1Object as Asn1Set;
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if (null == that)
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return false;
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int count = this.Count;
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if (that.Count != count)
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return false;
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for (int i = 0; i < count; ++i)
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{
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Asn1Object o1 = this.elements[i].ToAsn1Object();
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Asn1Object o2 = that.elements[i].ToAsn1Object();
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if (o1 != o2 && !o1.CallAsn1Equals(o2))
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return false;
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}
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return true;
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}
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protected internal void Sort()
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{
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if (elements.Length < 2)
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return;
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#if PORTABLE || NETFX_CORE
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this.elements = elements
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.Cast<Asn1Encodable>()
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.Select(a => new { Item = a, Key = a.GetEncoded(Asn1Encodable.Der) })
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.OrderBy(t => t.Key, new DerComparer())
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.Select(t => t.Item)
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.ToArray();
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#else
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int count = elements.Length;
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byte[][] keys = new byte[count][];
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for (int i = 0; i < count; ++i)
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{
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keys[i] = elements[i].GetEncoded(Der);
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}
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Array.Sort(keys, elements, new DerComparer());
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#endif
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}
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public override string ToString()
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{
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return CollectionUtilities.ToString(elements);
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}
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#if PORTABLE || NETFX_CORE
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private class DerComparer
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: IComparer<byte[]>
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{
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public int Compare(byte[] x, byte[] y)
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{
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byte[] a = x, b = y;
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#else
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private class DerComparer
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: IComparer
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{
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public int Compare(object x, object y)
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{
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byte[] a = (byte[])x, b = (byte[])y;
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#endif
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Debug.Assert(a.Length >= 2 && b.Length >= 2);
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/*
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* NOTE: Set elements in DER encodings are ordered first according to their tags (class and
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* number); the CONSTRUCTED bit is not part of the tag.
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*
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* For SET-OF, this is unimportant. All elements have the same tag and DER requires them to
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* either all be in constructed form or all in primitive form, according to that tag. The
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* elements are effectively ordered according to their content octets.
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*
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* For SET, the elements will have distinct tags, and each will be in constructed or
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* primitive form accordingly. Failing to ignore the CONSTRUCTED bit could therefore lead to
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* ordering inversions.
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*/
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int a0 = a[0] & ~Asn1Tags.Constructed;
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int b0 = b[0] & ~Asn1Tags.Constructed;
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if (a0 != b0)
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return a0 < b0 ? -1 : 1;
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int len = System.Math.Min(a.Length, b.Length);
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for (int i = 1; i < len; ++i)
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{
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byte ai = a[i], bi = b[i];
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if (ai != bi)
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return ai < bi ? -1 : 1;
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}
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Debug.Assert(a.Length == b.Length);
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return 0;
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}
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}
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}
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}
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#pragma warning restore
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#endif
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