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

   1 package org.bouncycastle.asn1.x509;
   2
   3 import java.io.*;
   4 import java.util.Enumeration;
   5 import java.math.BigInteger;
   6
   7 import org.bouncycastle.asn1.*;
   8 import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
   9
  10 /**
  11  * The object that contains the public key stored in a certficate.
  12  * <p>
  13  * The getEncoded() method in the public keys in the JCE produces a DER
  14  * encoded one of these.
  15  */
  16 public class SubjectPublicKeyInfo
  17     implements DEREncodable
  18 {
  19     private AlgorithmIdentifier     algId;
  20     private DERObject               pubKey;
  21
  22     public SubjectPublicKeyInfo(
  23         AlgorithmIdentifier algId,
  24         DERObject           publicKey)
  25     {
  26         this.pubKey = publicKey;
  27         this.algId = algId;
  28     }
  29
  30     public SubjectPublicKeyInfo(
  31         DERConstructedSequence  seq)
  32     {
  33         Enumeration         e = seq.getObjects();
  34
  35         algId = new AlgorithmIdentifier((DERConstructedSequence)e.nextElement());
  36
  37         byte[]  keyData = ((DERBitString)e.nextElement()).getBytes();
  38
  39         try
  40         {
  41             ByteArrayInputStream    bIn = new ByteArrayInputStream(keyData);
  42             DERInputStream          dIn = new DERInputStream(bIn);
  43
  44             pubKey = (DERObject)dIn.readObject();
  45         }
  46         catch (IOException ex)
  47         {
  48             throw new IllegalArgumentException("error recovering public key");
  49         }
  50     }
  51
  52     public AlgorithmIdentifier getAlgorithmId()
  53     {
  54         return algId;
  55     }
  56
  57     public DERObject getPublicKey()
  58     {
  59         return pubKey;
  60     }
  61
  62     /**
  63      * <pre>
  64      * SubjectPublicKeyInfo ::= SEQUENCE {
  65      *                          algorithm AlgorithmIdentifier,
  66      *                          publicKey BIT STRING }
  67      * </pre>
  68      */
  69     public DERObject getDERObject()
  70     {
  71         DERConstructedSequence  seq = new DERConstructedSequence();
  72
  73         seq.addObject(algId);
  74         seq.addObject(new DERBitString(pubKey));
  75
  76         return seq;
  77     }
  78 }