What were you trying to do

Identify file's recipients, or at least how many recipients there are.

What happened

I created an ascii armored encrypted file. age gives no way to list its recipients, as it does in the binary format (excluding some bash magic relying on the knowledge that the PEM uses base64).

$ age-keygen -o key.txt
Public key: age13u320nw4pv6pv7qrve2epr4r7233ms2x68r3y3tt653nyvg5y3jst3apxw
[0]$ echo 'Hello age' | age -a -r 'age13u320nw4pv6pv7qrve2epr4r7233ms2x68r3y3tt653nyvg5y3jst3apxw' -o encrypted.age.ascii
[0]$ cat encrypted.age.ascii
-----BEGIN AGE ENCRYPTED FILE-----
YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSAyUElIMVBpZThuVkh0WDVZ
TUwrSmxuNk1xZFI1dHliNy9Nd0ptZ0UrOVUwCi8wRzc0djRwemZHanJGTGhNb0pB
M0NQTzFQUzFzNEtpclIxeTh2ZkFwR0kKLS0tIFMxUjdZczEyVzZBczNvTGJmZ1VN
Z1hoMWxVOHEwcm40TnZ1VWcvRGM4R0kKQASOAFMfE0DMdj++onPwdeByjMGRP6Sj
3PbGzfjpktCw9HJ14r+qX9B/
-----END AGE ENCRYPTED FILE-----
[0]$ tail -n +2 encrypted.age.ascii | base64 -d
age-encryption.org/v1
-> X25519 2PIH1Pie8nVHtX5YML+Jln6MqdR5tyb7/MwJmgE+9U0
/0G74v4pzfGjrFLhMoJA3CPO1PS1s4KirR1y8vfApGI
--- S1R7Ys12W6As3oLbfgUMgXh1lU8q0rn4NvuUg/Dc8GI
@�S@�v?��s�u�r���?���������а�ru⿪_�base64: invalid input

As a matter of fact, a pretty listing of recipients would also be useful for non-armored files, if it could present the files in the same format as originially (e.g. to visually match/grep ssh pubkey to one of the files in ~/.ssh/id_rsa). And be a good follow up for the error message "Error: no identity matched a recipient".

Side note - confusing feature set of beta

By browsing this repo's issues, the mailing list and the age specification, I encountered various potential methods of storing the keys and specifying recipients (the ~/.config/age/keys.txt path, recipient's github username, providing https url of the keys). None of them seemed to work. It would be nice for the repo's readme to be more explicit about which parts are NOT implemented in the current version.