DKIM relaxed header canonicalization

[breedbekkikker]

DKIM header hash validation fails with relaxed header canonicalization of a multiline header that has FWS with WSP before CRLF.

For example, consider the following original header:

Name:[WSP]example[WSP][CRLF][WSP]value[CRLF]

The header should be after relaxed canonicalization:

name:[SP]example[SP]value[CRLF]

[jstedfast]

Can you write a unit test for me?

[jstedfast]

BTW, your example is wrong:

   o  Delete any WSP characters remaining before and after the colon
      separating the header field name from the header field value.  The
      colon separator MUST be retained.

This means that your example should end up as:

name:example[SP]value[CRLF]

[breedbekkikker]

Thanks, I agree with your correction of the example.

I will follow up on the unit test.