SignedAttachment


1   package net.suberic.pooka.crypto;
2   
3   import net.suberic.pooka.*;
4   import net.suberic.crypto.*;
5   
6   import javax.mail.internet.*;
7   import javax.mail.*;
8   import javax.activation.DataHandler  ;
9   
10  import java.security.Key  ;
11  
12  import java.io.*;
13  
14  /**
15   * A signed attachment.
16   */
17  public class SignedAttachment extends Attachment {
18  
19    boolean parsed = false;
20  
21    /**
22     * Creates a SignedAttachment out of a MimePart.
23     */
24    public SignedAttachment(MimePart mp) throws MessagingException {
25      super(mp);
26    }
27    
28    /**
29     * Returns if the signature matches.
30     */
31    public boolean checkSignature(EncryptionUtils utils, Key   key) 
32      throws MessagingException, java.io.IOException  , java.security.GeneralSecurityException   {
33  
34      Object   content = getDataHandler().getContent();
35      if (content instanceof MimeMultipart) {
36        return utils.checkSignature((MimeMultipart) content, key);
37      } else {
38        return false;
39      }
40    }
41  
42    /**
43     * Returns the content part of the signed attachment.
44     */
45    public MimeBodyPart getSignedPart() throws javax.mail.MessagingException  ,
46    java.io.IOException   {
47      Object   content = getDataHandler().getContent();
48      if (content instanceof MimeMultipart) {
49        MimeMultipart mm = (MimeMultipart) content;
50  
51        // this should be exactly two parts, one the content, the other the
52        // signature.
53        for (int i = 0; i < mm.getCount(); i++) {
54      // return the first one found.
55      MimeBodyPart mbp = (MimeBodyPart) mm.getBodyPart(i);
56      ContentType ct = new ContentType(mbp.getContentType());
57      if (! ct.getSubType().toLowerCase().endsWith("signature")) {
58        return mbp;
59      } 
60        }
61      }
62  
63      return null;
64    }
65  
66    /**
67     * Returns the DataHandler for this Attachment.
68     */
69    public DataHandler   getDataHandler() {
70      return super.getDataHandler();
71    }
72  
73  
74    /**
75     * Returns the MimeType.
76     */
77    /*
78    public ContentType getMimeType() {
79      try {
80        return new ContentType("text/plain");
81      } catch (javax.mail.internet.ParseException pe) {
82        return null;
83      }
84    }
85    */
86  }
87
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