| package org.bouncycastle.asn1; |
| |
| import java.io.IOException; |
| import java.util.Enumeration; |
| import java.util.Vector; |
| |
| public abstract class ASN1Sequence |
| extends ASN1Primitive |
| { |
| protected Vector seq = new Vector(); |
| |
| /** |
| * return an ASN1Sequence from the given object. |
| * |
| * @param obj the object we want converted. |
| * @exception IllegalArgumentException if the object cannot be converted. |
| */ |
| public static ASN1Sequence getInstance( |
| Object obj) |
| { |
| if (obj == null || obj instanceof ASN1Sequence) |
| { |
| return (ASN1Sequence)obj; |
| } |
| else if (obj instanceof ASN1SequenceParser) |
| { |
| return ASN1Sequence.getInstance(((ASN1SequenceParser)obj).toASN1Primitive()); |
| } |
| else if (obj instanceof byte[]) |
| { |
| try |
| { |
| return ASN1Sequence.getInstance(fromByteArray((byte[])obj)); |
| } |
| catch (IOException e) |
| { |
| throw new IllegalArgumentException("failed to construct sequence from byte[]: " + e.getMessage()); |
| } |
| } |
| else if (obj instanceof ASN1Encodable) |
| { |
| ASN1Primitive primitive = ((ASN1Encodable)obj).toASN1Primitive(); |
| |
| if (primitive instanceof ASN1Sequence) |
| { |
| return (ASN1Sequence)primitive; |
| } |
| } |
| |
| throw new IllegalArgumentException("unknown object in getInstance: " + obj.getClass().getName()); |
| } |
| |
| /** |
| * Return an ASN1 sequence from a tagged object. There is a special |
| * case here, if an object appears to have been explicitly tagged on |
| * reading but we were expecting it to be implicitly tagged in the |
| * normal course of events it indicates that we lost the surrounding |
| * sequence - so we need to add it back (this will happen if the tagged |
| * object is a sequence that contains other sequences). If you are |
| * dealing with implicitly tagged sequences you really <b>should</b> |
| * be using this method. |
| * |
| * @param obj the tagged object. |
| * @param explicit true if the object is meant to be explicitly tagged, |
| * false otherwise. |
| * @exception IllegalArgumentException if the tagged object cannot |
| * be converted. |
| */ |
| public static ASN1Sequence getInstance( |
| ASN1TaggedObject obj, |
| boolean explicit) |
| { |
| if (explicit) |
| { |
| if (!obj.isExplicit()) |
| { |
| throw new IllegalArgumentException("object implicit - explicit expected."); |
| } |
| |
| return ASN1Sequence.getInstance(obj.getObject().toASN1Primitive()); |
| } |
| else |
| { |
| // |
| // constructed object which appears to be explicitly tagged |
| // when it should be implicit means we have to add the |
| // surrounding sequence. |
| // |
| if (obj.isExplicit()) |
| { |
| if (obj instanceof BERTaggedObject) |
| { |
| return new BERSequence(obj.getObject()); |
| } |
| else |
| { |
| return new DLSequence(obj.getObject()); |
| } |
| } |
| else |
| { |
| if (obj.getObject() instanceof ASN1Sequence) |
| { |
| return (ASN1Sequence)obj.getObject(); |
| } |
| } |
| } |
| |
| throw new IllegalArgumentException("unknown object in getInstance: " + obj.getClass().getName()); |
| } |
| |
| /** |
| * create an empty sequence |
| */ |
| protected ASN1Sequence() |
| { |
| } |
| |
| /** |
| * create a sequence containing one object |
| */ |
| protected ASN1Sequence( |
| ASN1Encodable obj) |
| { |
| seq.addElement(obj); |
| } |
| |
| /** |
| * create a sequence containing a vector of objects. |
| */ |
| protected ASN1Sequence( |
| ASN1EncodableVector v) |
| { |
| for (int i = 0; i != v.size(); i++) |
| { |
| seq.addElement(v.get(i)); |
| } |
| } |
| |
| /** |
| * create a sequence containing a vector of objects. |
| */ |
| protected ASN1Sequence( |
| ASN1Encodable[] array) |
| { |
| for (int i = 0; i != array.length; i++) |
| { |
| seq.addElement(array[i]); |
| } |
| } |
| |
| public ASN1Encodable[] toArray() |
| { |
| ASN1Encodable[] values = new ASN1Encodable[this.size()]; |
| |
| for (int i = 0; i != this.size(); i++) |
| { |
| values[i] = this.getObjectAt(i); |
| } |
| |
| return values; |
| } |
| |
| public Enumeration getObjects() |
| { |
| return seq.elements(); |
| } |
| |
| public ASN1SequenceParser parser() |
| { |
| final ASN1Sequence outer = this; |
| |
| return new ASN1SequenceParser() |
| { |
| private final int max = size(); |
| |
| private int index; |
| |
| public ASN1Encodable readObject() throws IOException |
| { |
| if (index == max) |
| { |
| return null; |
| } |
| |
| ASN1Encodable obj = getObjectAt(index++); |
| if (obj instanceof ASN1Sequence) |
| { |
| return ((ASN1Sequence)obj).parser(); |
| } |
| if (obj instanceof ASN1Set) |
| { |
| return ((ASN1Set)obj).parser(); |
| } |
| |
| return obj; |
| } |
| |
| public ASN1Primitive getLoadedObject() |
| { |
| return outer; |
| } |
| |
| public ASN1Primitive toASN1Primitive() |
| { |
| return outer; |
| } |
| }; |
| } |
| |
| /** |
| * return the object at the sequence position indicated by index. |
| * |
| * @param index the sequence number (starting at zero) of the object |
| * @return the object at the sequence position indicated by index. |
| */ |
| public ASN1Encodable getObjectAt( |
| int index) |
| { |
| return (ASN1Encodable)seq.elementAt(index); |
| } |
| |
| /** |
| * return the number of objects in this sequence. |
| * |
| * @return the number of objects in this sequence. |
| */ |
| public int size() |
| { |
| return seq.size(); |
| } |
| |
| public int hashCode() |
| { |
| Enumeration e = this.getObjects(); |
| int hashCode = size(); |
| |
| while (e.hasMoreElements()) |
| { |
| Object o = getNext(e); |
| hashCode *= 17; |
| |
| hashCode ^= o.hashCode(); |
| } |
| |
| return hashCode; |
| } |
| |
| boolean asn1Equals( |
| ASN1Primitive o) |
| { |
| if (!(o instanceof ASN1Sequence)) |
| { |
| return false; |
| } |
| |
| ASN1Sequence other = (ASN1Sequence)o; |
| |
| if (this.size() != other.size()) |
| { |
| return false; |
| } |
| |
| Enumeration s1 = this.getObjects(); |
| Enumeration s2 = other.getObjects(); |
| |
| while (s1.hasMoreElements()) |
| { |
| ASN1Encodable obj1 = getNext(s1); |
| ASN1Encodable obj2 = getNext(s2); |
| |
| ASN1Primitive o1 = obj1.toASN1Primitive(); |
| ASN1Primitive o2 = obj2.toASN1Primitive(); |
| |
| if (o1 == o2 || o1.equals(o2)) |
| { |
| continue; |
| } |
| |
| return false; |
| } |
| |
| return true; |
| } |
| |
| private ASN1Encodable getNext(Enumeration e) |
| { |
| ASN1Encodable encObj = (ASN1Encodable)e.nextElement(); |
| |
| return encObj; |
| } |
| |
| ASN1Primitive toDERObject() |
| { |
| ASN1Sequence derSeq = new DERSequence(); |
| |
| derSeq.seq = this.seq; |
| |
| return derSeq; |
| } |
| |
| ASN1Primitive toDLObject() |
| { |
| ASN1Sequence dlSeq = new DLSequence(); |
| |
| dlSeq.seq = this.seq; |
| |
| return dlSeq; |
| } |
| |
| boolean isConstructed() |
| { |
| return true; |
| } |
| |
| abstract void encode(ASN1OutputStream out) |
| throws IOException; |
| |
| public String toString() |
| { |
| return seq.toString(); |
| } |
| } |