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https://issues.apache.org/jira/browse/JDKIM-42?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17940325#comment-17940325
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Jean Helou commented on JDKIM-42:
---------------------------------
Hello,
I stumbled upon this issue, you can find an client of the DKIMVerify api in
[https://github.com/apache/james-project/blob/master/server/mailet/dkim/src/main/java/org/apache/james/jdkim/mailets/DKIMVerify.java#L53]
you can check how the tests for this are instantiated :
[https://github.com/apache/james-project/blob/e09a085b8fb195495f0f0844bc91068a638b5f62/server/mailet/dkim/src/test/java/org/apache/james/jdkim/mailets/DKIMVerifyTest.java#L93]
I realize that 7 years later you are probably not expecting an answer anymore
but hopefully this comment can help some else in the future :D
> 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
> Priority: Major
>
> 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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