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Diffstat (limited to 'core/src/main/java/org/spongycastle/asn1/DLSet.java')
| -rw-r--r-- | core/src/main/java/org/spongycastle/asn1/DLSet.java | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/core/src/main/java/org/spongycastle/asn1/DLSet.java b/core/src/main/java/org/spongycastle/asn1/DLSet.java new file mode 100644 index 00000000..071c29e2 --- /dev/null +++ b/core/src/main/java/org/spongycastle/asn1/DLSet.java @@ -0,0 +1,146 @@ +package org.spongycastle.asn1; + +import java.io.IOException; +import java.util.Enumeration; + +/** + * The DLSet encodes ASN.1 SET value without element ordering, + * and always using definite length form. + * <hr> + * <h2>X.690</h2> + * <h3>8: Basic encoding rules</h3> + * <h4>8.11 Encoding of a set value </h4> + * <b>8.11.1</b> The encoding of a set value shall be constructed + * <p> + * <b>8.11.2</b> The contents octets shall consist of the complete + * encoding of a data value from each of the types listed in the + * ASN.1 definition of the set type, in an order chosen by the sender, + * unless the type was referenced with the keyword + * <b>OPTIONAL</b> or the keyword <b>DEFAULT</b>. + * <p> + * <b>8.11.3</b> The encoding of a data value may, but need not, + * be present for a type which was referenced with the keyword + * <b>OPTIONAL</b> or the keyword <b>DEFAULT</b>. + * <blockquote> + * NOTE — The order of data values in a set value is not significant, + * and places no constraints on the order during transfer + * </blockquote> + * <h3>9: Canonical encoding rules</h3> + * <h4>9.3 Set components</h4> + * The encodings of the component values of a set value shall + * appear in an order determined by their tags as specified + * in 8.6 of ITU-T Rec. X.680 | ISO/IEC 8824-1. + * Additionally, for the purposes of determining the order in which + * components are encoded when one or more component is an untagged + * choice type, each untagged choice type is ordered as though it + * has a tag equal to that of the smallest tag in that choice type + * or any untagged choice types nested within. + * <h3>10: Distinguished encoding rules</h3> + * <h4>10.3 Set components</h4> + * The encodings of the component values of a set value shall appear + * in an order determined by their tags as specified + * in 8.6 of ITU-T Rec. X.680 | ISO/IEC 8824-1. + * <blockquote> + * NOTE — Where a component of the set is an untagged choice type, + * the location of that component in the ordering will depend on + * the tag of the choice component being encoded. + * </blockquote> + * <h3>11: Restrictions on BER employed by both CER and DER</h3> + * <h4>11.5 Set and sequence components with default value </h4> + * The encoding of a set value or sequence value shall not include + * an encoding for any component value which is equal to + * its default value. + */ +public class DLSet + extends ASN1Set +{ + private int bodyLength = -1; + + /** + * create an empty set + */ + public DLSet() + { + } + + /** + * @param obj - a single object that makes up the set. + */ + public DLSet( + ASN1Encodable obj) + { + super(obj); + } + + /** + * @param v - a vector of objects making up the set. + */ + public DLSet( + ASN1EncodableVector v) + { + super(v, false); + } + + /** + * create a set from an array of objects. + */ + public DLSet( + ASN1Encodable[] a) + { + super(a, false); + } + + private int getBodyLength() + throws IOException + { + if (bodyLength < 0) + { + int length = 0; + + for (Enumeration e = this.getObjects(); e.hasMoreElements();) + { + Object obj = e.nextElement(); + + length += ((ASN1Encodable)obj).toASN1Primitive().toDLObject().encodedLength(); + } + + bodyLength = length; + } + + return bodyLength; + } + + int encodedLength() + throws IOException + { + int length = getBodyLength(); + + return 1 + StreamUtil.calculateBodyLength(length) + length; + } + + /** + * A note on the implementation: + * <p> + * As DL 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) + throws IOException + { + ASN1OutputStream dOut = out.getDLSubStream(); + int length = getBodyLength(); + + out.write(BERTags.SET | BERTags.CONSTRUCTED); + out.writeLength(length); + + for (Enumeration e = this.getObjects(); e.hasMoreElements();) + { + Object obj = e.nextElement(); + + dOut.writeObject((ASN1Encodable)obj); + } + } +}
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