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      1 package org.bouncycastle.asn1.x509;
      2 
      3 import java.util.Enumeration;
      4 
      5 import org.bouncycastle.asn1.ASN1EncodableVector;
      6 import org.bouncycastle.asn1.ASN1Object;
      7 import org.bouncycastle.asn1.ASN1OctetString;
      8 import org.bouncycastle.asn1.ASN1Primitive;
      9 import org.bouncycastle.asn1.ASN1Sequence;
     10 import org.bouncycastle.asn1.ASN1TaggedObject;
     11 import org.bouncycastle.asn1.DEROctetString;
     12 import org.bouncycastle.asn1.DERSequence;
     13 
     14 /**
     15  * The DigestInfo object.
     16  * <pre>
     17  * DigestInfo::=SEQUENCE{
     18  *          digestAlgorithm  AlgorithmIdentifier,
     19  *          digest OCTET STRING }
     20  * </pre>
     21  */
     22 public class DigestInfo
     23     extends ASN1Object
     24 {
     25     private byte[]                  digest;
     26     private AlgorithmIdentifier     algId;
     27 
     28     public static DigestInfo getInstance(
     29         ASN1TaggedObject obj,
     30         boolean          explicit)
     31     {
     32         return getInstance(ASN1Sequence.getInstance(obj, explicit));
     33     }
     34 
     35     public static DigestInfo getInstance(
     36         Object  obj)
     37     {
     38         if (obj instanceof DigestInfo)
     39         {
     40             return (DigestInfo)obj;
     41         }
     42         else if (obj != null)
     43         {
     44             return new DigestInfo(ASN1Sequence.getInstance(obj));
     45         }
     46 
     47         return null;
     48     }
     49 
     50     public DigestInfo(
     51         AlgorithmIdentifier  algId,
     52         byte[]               digest)
     53     {
     54         this.digest = digest;
     55         this.algId = algId;
     56     }
     57 
     58     public DigestInfo(
     59         ASN1Sequence  obj)
     60     {
     61         Enumeration             e = obj.getObjects();
     62 
     63         algId = AlgorithmIdentifier.getInstance(e.nextElement());
     64         digest = ASN1OctetString.getInstance(e.nextElement()).getOctets();
     65     }
     66 
     67     public AlgorithmIdentifier getAlgorithmId()
     68     {
     69         return algId;
     70     }
     71 
     72     public byte[] getDigest()
     73     {
     74         return digest;
     75     }
     76 
     77     public ASN1Primitive toASN1Primitive()
     78     {
     79         ASN1EncodableVector  v = new ASN1EncodableVector();
     80 
     81         v.add(algId);
     82         v.add(new DEROctetString(digest));
     83 
     84         return new DERSequence(v);
     85     }
     86 }
     87