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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8.

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package org.bouncycastle.asn1;

import java.io.IOException;
import java.io.OutputStream;

/**
 * A DER encoded SET object
 * 

* For X.690 syntax rules, see {@link ASN1Set}. *

* For short: Constructing this form does sort the supplied elements, * and the sorting happens also before serialization (if necesssary). * This is different from the way {@link BERSet},{@link DLSet} does things. *

*/ public class DERSet extends ASN1Set { public static DERSet convert(ASN1Set set) { return (DERSet)set.toDERObject(); } private int bodyLength = -1; /** * create an empty set */ public DERSet() { } /** * create a set containing one object * @param element the object to go in the set */ public DERSet(ASN1Encodable element) { super(element); } /** * create a set containing a vector of objects. * @param elementVector the vector of objects to make up the set. */ public DERSet(ASN1EncodableVector elementVector) { super(elementVector, true); } /** * create a set containing an array of objects. * @param elements the array of objects to make up the set. */ public DERSet(ASN1Encodable[] elements) { super(elements, true); } DERSet(boolean isSorted, ASN1Encodable[] elements) { super(checkSorted(isSorted), elements); } private int getBodyLength() throws IOException { if (bodyLength < 0) { int count = elements.length; int totalLength = 0; for (int i = 0; i < count; ++i) { ASN1Primitive derObject = elements[i].toASN1Primitive().toDERObject(); totalLength += derObject.encodedLength(); } this.bodyLength = totalLength; } return bodyLength; } int encodedLength() throws IOException { int length = getBodyLength(); return 1 + StreamUtil.calculateBodyLength(length) + length; } /* * A note on the implementation: *

* As DER requires the constructed, definite-length model to * be used for structured types, this varies slightly from the * ASN.1 descriptions given. Rather than just outputting SET, * we also have to specify CONSTRUCTED, and the objects length. */ void encode(ASN1OutputStream out, boolean withTag) throws IOException { if (withTag) { out.write(BERTags.SET | BERTags.CONSTRUCTED); } DEROutputStream derOut = out.getDERSubStream(); int count = elements.length; if (bodyLength >= 0 || count > 16) { out.writeLength(getBodyLength()); for (int i = 0; i < count; ++i) { ASN1Primitive derObject = elements[i].toASN1Primitive().toDERObject(); derObject.encode(derOut, true); } } else { int totalLength = 0; ASN1Primitive[] derObjects = new ASN1Primitive[count]; for (int i = 0; i < count; ++i) { ASN1Primitive derObject = elements[i].toASN1Primitive().toDERObject(); derObjects[i] = derObject; totalLength += derObject.encodedLength(); } this.bodyLength = totalLength; out.writeLength(totalLength); for (int i = 0; i < count; ++i) { derObjects[i].encode(derOut, true); } } } ASN1Primitive toDERObject() { return isSorted ? this : super.toDERObject(); } ASN1Primitive toDLObject() { return this; } private static boolean checkSorted(boolean isSorted) { if (!isSorted) { throw new IllegalStateException("DERSet elements should always be in sorted order"); } return isSorted; } }





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