diff options
Diffstat (limited to 'core/src/main/java/org/spongycastle/asn1/DERSet.java')
-rw-r--r-- | core/src/main/java/org/spongycastle/asn1/DERSet.java | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/core/src/main/java/org/spongycastle/asn1/DERSet.java b/core/src/main/java/org/spongycastle/asn1/DERSet.java new file mode 100644 index 00000000..b504a8fd --- /dev/null +++ b/core/src/main/java/org/spongycastle/asn1/DERSet.java @@ -0,0 +1,108 @@ +package org.spongycastle.asn1; + +import java.io.IOException; +import java.util.Enumeration; + +/** + * A DER encoded set object + */ +public class DERSet + extends ASN1Set +{ + private int bodyLength = -1; + + /** + * create an empty set + */ + public DERSet() + { + } + + /** + * @param obj - a single object that makes up the set. + */ + public DERSet( + ASN1Encodable obj) + { + super(obj); + } + + /** + * @param v - a vector of objects making up the set. + */ + public DERSet( + ASN1EncodableVector v) + { + super(v, true); + } + + /** + * create a set from an array of objects. + */ + public DERSet( + ASN1Encodable[] a) + { + super(a, true); + } + + DERSet( + ASN1EncodableVector v, + boolean doSort) + { + super(v, doSort); + } + + 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().toDERObject().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 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) + throws IOException + { + ASN1OutputStream dOut = out.getDERSubStream(); + 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); + } + } +} |