src/org/bouncycastle/asn1/x509/DigestInfo.java

   1 package org.bouncycastle.asn1.x509;
   2
   3 import java.util.Enumeration;
   4
   5 import org.bouncycastle.asn1.*;
   6 import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
   7
   8 /**
   9  * <pre>
  10  * DigestInfo::=SEQUENCE{
  11  *          digestAlgorithm  AlgorithmIdentifier,
  12  *          digest OCTET STRING }
  13  * </pre>
  14  */
  15 public class DigestInfo
  16     implements PKCSObjectIdentifiers, DEREncodable
  17 {
  18     private byte[]                  digest;
  19     private AlgorithmIdentifier     algId;
  20
  21     public DigestInfo(
  22         AlgorithmIdentifier  algId,
  23         byte[]               digest)
  24     {
  25         this.digest = digest;
  26         this.algId = algId;
  27     }
  28
  29     public DigestInfo(
  30         DERConstructedSequence  seq)
  31     {
  32         Enumeration             e = seq.getObjects();
  33
  34         algId = new AlgorithmIdentifier((DERConstructedSequence)e.nextElement());
  35         digest = ((DEROctetString)e.nextElement()).getOctets();
  36     }
  37
  38     public AlgorithmIdentifier getAlgorithmId()
  39     {
  40         return algId;
  41     }
  42
  43     public byte[] getDigest()
  44     {
  45         return digest;
  46     }
  47
  48     public DERObject getDERObject()
  49     {
  50         DERConstructedSequence  seq = new DERConstructedSequence();
  51
  52         seq.addObject(algId);
  53         seq.addObject(new DEROctetString(digest));
  54
  55         return seq;
  56     }
  57 }