On 2015/2/19 00:22, Dave Thompson wrote:
genpkey has a standard idea, across all algorithms that have parameters
(which RSA does not), to generate parameters and key(s) as separate
steps with a file in between. For DSA and DH this is good; you may want
to generate your own params, or you may want to use existing ones
(in an existing file) e.g. Oakley or SSH-non-GEX. For EC it makes less
sense,
as generating your own curve is complicated (OpenSSL certainly doesn't do
it)
and in practice everyone* uses the named curves. Nonetheless you still do:
openssl genpkey -genparam -algorithm EC -pkeyopt ec_paramgen_curve:x >pfile
openssl genpkey -paramfile pfile >keyfile
Thank you, this is clear now. It might be worth adding an example to the
man page to prevent others from being similarly confused.
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