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From "Stefano Bagnara (JIRA)" <j...@apache.org>
Subject [jira] Created: (JDKIM-15) Support timestamp (t=) attribute in signature
Date Fri, 04 Jun 2010 13:26:54 GMT
Support timestamp (t=) attribute in signature
---------------------------------------------

                 Key: JDKIM-15
                 URL: https://issues.apache.org/jira/browse/JDKIM-15
             Project: JAMES jDKIM
          Issue Type: Improvement
          Components: library
    Affects Versions: 0.2
            Reporter: Stefano Bagnara
            Assignee: Stefano Bagnara
             Fix For: 0.2


t=
    Signature Timestamp (plain-text unsigned decimal integer; RECOMMENDED, default is an unknown
creation time). The time that this signature was created. The format is the number of seconds
since 00:00:00 on January 1, 1970 in the UTC time zone. The value is expressed as an unsigned
integer in decimal ASCII. This value is not constrained to fit into a 31- or 32-bit integer.
Implementations SHOULD be prepared to handle values up to at least 10^12 (until approximately
AD 200,000; this fits into 40 bits). To avoid denial-of-service attacks, implementations MAY
consider any value longer than 12 digits to be infinite. Leap seconds are not counted. Implementations
MAY ignore signatures that have a timestamp in the future.
    ABNF:

            sig-t-tag    = %x74 [FWS] "=" [FWS] 1*12DIGIT


If the input signature has "t=;" then we could add the current timestamp, otherwise we should
leave everything as is.

While verifying a signature with a t= parameter we should "ignore" signatures with a date
in the future.


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