[jira] [Created] (JDKIM-42) Example on how to use verify bh in DKIM

["BG (JIRA)" <ji...@apache.org>]

BG created JDKIM-42:
-----------------------

             Summary: Example on how to use verify bh in DKIM
                 Key: JDKIM-42
                 URL: https://issues.apache.org/jira/browse/JDKIM-42
             Project: James jDKIM
          Issue Type: Question
            Reporter: BG


Trying to verify the DKIM bh value for an email using verify method from tests.

 {{protected static List<SignatureRecord> verify(DKIMVerifier verifier, MimeMessage message, boolean forceCRLF)
        throws MessagingException, FailException {
        Headers headers = new MimeMessageHeaders(message);
        BodyHasher bh = verifier.newBodyHasher(headers);
        try {
            if (bh != null) {
                OutputStream os = new HeaderSkippingOutputStream(bh
                    .getOutputStream());
                if (forceCRLF) os = new CRLFOutputStream(os);
                message.writeTo(os);
                bh.getOutputStream().close();
            }

        } catch (IOException e) {
            throw new MessagingException("Exception calculating bodyhash: "
                + e.getMessage(), e);
        }
        return verifier.verify(bh);
    }}}

Created DKIMVerifier with a PublicKeyRecordRetriever. Call verify method with following:

{{verify(new DKIMVerifier(pkr), new MimeMessage(Session.getDefaultInstance(new Properties()), new ByteArrayInputStream(str.getBytes())), false);}}

str is a String with all of the source (headers and content) of an email.

verify throws error "Header signature does not verify" from line with "BodyHasher bh = verifier.newBodyHasher(headers);".

The only place in codebase where DKIMVerify.verify is used is in DKIMSignTest which uses a MockPublicKeyRecordRetriever. 

What is incorrect with implementation?

Thanks.



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