openssl dhparam -help
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Diffie-Hellman Parameter Management. Obsoleted by dhparam(1).
Generation and Management of Diffie-Hellman Parameters. Superseded by genpkey(1) and pkeyparam(1).
$ openssl dhparam -help Usage: dhparam [flags] [numbits] Valid options are: -help Display this summary -in infile Input file -inform PEM|DER Input format, DER or PEM -outform PEM|DER Output format, DER or PEM -out outfile Output file -check Check the DH parameters -text Print a text form of the DH parameters -noout Don't output any DH parameters -rand val Load the file(s) into the random number generator -writerand outfile Write random data to the specified file -C Print C code -2 Generate parameters using 2 as the generator value -5 Generate parameters using 5 as the generator value -dsaparam Read or generate DSA parameters, convert to DH -engine val Use engine e, possibly a hardware device
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