BUG() in symmetric decryption mode

[Tavis Ormandy]

Hello, I happened to notice this hit's a BUG() in 2.2.27, it's no big
deal just a bad algorithm not handled gracefully:

$ printf "\x8c\x49\x05\x0e\x0a\x03\x01" | gpg --decrypt --pinentry-mode loopback --passphrase secret
gpg: encrypted with unknown algorithm 14
gpg: Ohhhh jeeee: ... this is a bug (passphrase.c:433:passphrase_to_dek)
Aborted

(It works.. uh, fails gracefully, in 2.2.19)

Thanks, Tavis.


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