Cracking PGP Desktop / OpenPGP / GnuPG private (secret) keys with john
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1. Run gpg2john on PGP private key files (supports .skr files too!)

E.g. $ ../run/gpg2john openwall.sec.asc > hashes
E.g. $ ../run/gpg2john openwall.skr > hashes

Ensure that the input file to gpg2john contains a single private key.

2. Run john on the output of gpg2john.

E.g. $ ../run/john hashes