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package org.bouncycastle.asn1.cms;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.BERSequence;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
/**
* RFC 3274 - CMS Digest Data.
* <pre>
* DigestedData ::= SEQUENCE {
* version CMSVersion,
* digestAlgorithm DigestAlgorithmIdentifier,
* encapContentInfo EncapsulatedContentInfo,
* digest Digest }
* </pre>
*/
public class DigestedData
extends ASN1Object
{
private ASN1Integer version;
private AlgorithmIdentifier digestAlgorithm;
private ContentInfo encapContentInfo;
private ASN1OctetString digest;
public DigestedData(
AlgorithmIdentifier digestAlgorithm,
ContentInfo encapContentInfo,
byte[] digest)
{
this.version = new ASN1Integer(0);
this.digestAlgorithm = digestAlgorithm;
this.encapContentInfo = encapContentInfo;
this.digest = new DEROctetString(digest);
}
private DigestedData(
ASN1Sequence seq)
{
this.version = (ASN1Integer)seq.getObjectAt(0);
this.digestAlgorithm = AlgorithmIdentifier.getInstance(seq.getObjectAt(1));
this.encapContentInfo = ContentInfo.getInstance(seq.getObjectAt(2));
this.digest = ASN1OctetString.getInstance(seq.getObjectAt(3));
}
/**
* return a CompressedData object from a tagged object.
*
* @param _ato the tagged object holding the object we want.
* @param _explicit true if the object is meant to be explicitly
* tagged false otherwise.
* @exception IllegalArgumentException if the object held by the
* tagged object cannot be converted.
*/
public static DigestedData getInstance(
ASN1TaggedObject _ato,
boolean _explicit)
{
return getInstance(ASN1Sequence.getInstance(_ato, _explicit));
}
/**
* return a CompressedData object from the given object.
*
* @param obj the object we want converted.
* @exception IllegalArgumentException if the object cannot be converted.
*/
public static DigestedData getInstance(
Object obj)
{
if (obj instanceof DigestedData)
{
return (DigestedData)obj;
}
if (obj != null)
{
return new DigestedData(ASN1Sequence.getInstance(obj));
}
return null;
}
public ASN1Integer getVersion()
{
return version;
}
public AlgorithmIdentifier getDigestAlgorithm()
{
return digestAlgorithm;
}
public ContentInfo getEncapContentInfo()
{
return encapContentInfo;
}
public ASN1Primitive toASN1Primitive()
{
ASN1EncodableVector v = new ASN1EncodableVector();
v.add(version);
v.add(digestAlgorithm);
v.add(encapContentInfo);
v.add(digest);
return new BERSequence(v);
}
public byte[] getDigest()
{
return digest.getOctets();
}
}
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