diff options
Diffstat (limited to 'libraries/spongycastle/core/src/main/java/org/spongycastle/asn1/DLSequence.java')
-rw-r--r-- | libraries/spongycastle/core/src/main/java/org/spongycastle/asn1/DLSequence.java | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/libraries/spongycastle/core/src/main/java/org/spongycastle/asn1/DLSequence.java b/libraries/spongycastle/core/src/main/java/org/spongycastle/asn1/DLSequence.java new file mode 100644 index 000000000..1c621cba8 --- /dev/null +++ b/libraries/spongycastle/core/src/main/java/org/spongycastle/asn1/DLSequence.java @@ -0,0 +1,101 @@ +package org.spongycastle.asn1; + +import java.io.IOException; +import java.util.Enumeration; + +/** + * The DLSequence encodes a SEQUENCE using definite length form. + */ +public class DLSequence + extends ASN1Sequence +{ + private int bodyLength = -1; + + /** + * Create an empty sequence + */ + public DLSequence() + { + } + + /** + * Create a sequence containing one object + */ + public DLSequence( + ASN1Encodable obj) + { + super(obj); + } + + /** + * Create a sequence containing a vector of objects. + */ + public DLSequence( + ASN1EncodableVector v) + { + super(v); + } + + /** + * Create a sequence containing an array of objects. + */ + public DLSequence( + ASN1Encodable[] array) + { + super(array); + } + + 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 SEQUENCE, + * 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.SEQUENCE | BERTags.CONSTRUCTED); + out.writeLength(length); + + for (Enumeration e = this.getObjects(); e.hasMoreElements();) + { + Object obj = e.nextElement(); + + dOut.writeObject((ASN1Encodable)obj); + } + } +}
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