Support timestamp (t=) attribute in signature
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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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