pgg-passphrase-cache-expiry

[Luedde, Mirko]

Hi there, 

the `pgg' library seems to have a problem with cache expiry. 
If the key is sufficiently long, then the cache will not expire: 

> pgg-passphrase-cache-expiry
> 16
>
> (pgg-add-passphrase-to-cache "1234567890abcdefghijklmnopqrstuvwxyz"
"mirko")
> [nil 18162 57301 836000 nil pgg-remove-passphrase-from-cache
("90abcdefghijklmnopqrstuvwxyz" nil) nil]
>
> (pgg-add-passphrase-to-cache "1234567" "mirko")
> [nil 18162 57304 239000 nil pgg-remove-passphrase-from-cache
("1234567" nil) nil]
>
> ;; after 16 secs
>
> (pgg-read-passphrase-from-cache "1234567")
> nil
>
> (pgg-read-passphrase-from-cache
"1234567890abcdefghijklmnopqrstuvwxyz")
> "mirko"

Perhaps it has to do with key truncation.  While the docs say key will
be truncated to 8 trailing characters, key will be truncated off 8 
leading characters.

Regards, Mirko. 

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