Openssl ecparam命令

openssl ecparam [-inform DER|PEM] [-outform DER|PEM] [-in filename] [-out filename] [-noout] [-text] [-C] [-check] [-name arg] [-list_curve] [-conv_form arg] [-param_enc arg] [-no_seed] [-rand file(s)] [-genkey] [-engine id]

-inform arg       input format - default PEM (DER or PEM)
 -outform arg      output format - default PEM
 -in  arg          input file  - default stdin
 -out arg          output file - default stdout
 -noout            do not print the ec parameter
 -text             print the ec parameters in text form
 -check            validate the ec parameters
 -C                print a ‘C‘ function creating the parameters
 -name arg         use the ec parameters with ‘short name‘ name
 -list_curves      prints a list of all currently available curve ‘short names‘
 -conv_form arg    specifies the point conversion form 
                   possible values: compressed
                                    uncompressed (default)
                                    hybrid
 -param_enc arg    specifies the way the ec parameters are encoded
                   in the asn1 der encoding
                   possible values: named_curve (default)
                                    explicit
 -no_seed          if ‘explicit‘ parameters are choosen do not use the seed
 -genkey           generate ec key
 -rand file        files to use for random number input
 -engine e         use engine e, possibly a hardware device

openssl ecparam -out ec_param.pem -name prime256v1 -param_enc explicit -genkey

openssl ecparam -in ec_param.pem -text

openssl ecparam -in ec_param.pem -check

参考：http://blog.csdn.net/as3luyuan123/article/details/14406429