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        expires_in   -- expiration time in seconds (default: reasonable)
        expires      -- whether or not the key should expire (default: True)
        sign         -- request the signing capability (see above)
        encrypt      -- request the encryption capability (see above)
        certify      -- request the certification capability (see above)
        authenticate -- request the authentication capability (see above)
        passphrase   -- protect the key with a passphrase (default: no
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        expires_in   -- expiration time in seconds (default: reasonable)
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        sign         -- request the signing capability (see above)
        encrypt      -- request the encryption capability (see above)
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        passphrase   -- protect the subkey with a passphrase (default: no
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