> Is there a way to determine the key length and the type of key (RSA or
> other) used when generating the keyring?
There seems to be a misunderstanding here. A keyring is just a
collection of certificates (which used to be called "keys"). Each
individual certificate will have various subkeys of different
algorithms, but the keyring *as a whole* has no algorithm nor bit length.
To get a detailed look at an individual key, try --list-key. (Which
should really be "--list-certificate". We're changing our language very
slowly.)
E.g.:
quorra:~ rjh$ gpg --list-key b44427c7
pub rsa3072/1DCBDC01B44427C7 2015-07-16 [SC]
CC11BE7CBBED77B120F37B011DCBDC01B44427C7
uid [ultimate] Robert J. Hansen <r...@sixdemonbag.org>
uid [ultimate] Robert J. Hansen <rob@hansen.engineering>
uid [ultimate] Robert J. Hansen <r...@enigmail.net>
sub rsa3072/DC0F82625FA6AADE 2015-07-16 [E]
sub ed25519/A83CAE94D3DC3873 2017-04-05 [S]
sub cv25519/AA24CC81B8AED08B 2017-04-05 [E]
The primary subkey is RSA-3072, made on July 16, 2015. There are three
other subkeys: an RSA-3072 useful for encryption (same date), an
Edwards-25519 key useful for signing (dating April 5, 2017); and an
ECC-25519 key useful for encryption (April 5, 2017).
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