- NAME
- SYNOPSIS
- DESCRIPTION
- OPTIONS
- NOTES
- EXAMPLES
- SEE ALSO
- COPYRIGHT

# NAME

ecparam - EC parameter manipulation and generation

# SYNOPSIS

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

# DESCRIPTION

This command is used to manipulate or generate EC parameter files.

此命令用于操作或生成EC参数文件。

# OPTIONS

-help

  Print out a usage message.

  输出使用信息。

-inform DER|PEM

  This specifies the input format. The DER option uses an ASN.1 DER encoded form compatible with RFC 3279 EcpkParameters. The PEM form is the default format: it consists of the DER format base64 encoded with additional header and footer lines.

  输入文件格式，DER或PEM格式。DER采用与RFC 3279EcpkParameters兼容的ASN1的DER标准格式。PEM格式是默认格式：它由DER格式base64编码，带有附加的页眉和页脚行。

-outform DER|PEM

  This specifies the output format, the options have the same meaning as the -inform option.

  指出输出格式。和-inform用法相同。

-in filename

  This specifies the input filename to read parameters from or standard input if this option is not specified.

  指出输入的如果未指定此选项，则指定从或从标准输入读取参数的输入文件名。

-out filename

  This specifies the output filename parameters to. Standard output is used if this option is not present. The output filename should not be the same as the input filename.

  指定输出文件名参数。 如果此选项不存在，则使用标准输出。 输出文件名不能与输入文件名相同

-noout

  This option inhibits the output of the encoded version of the parameters.

  不打印参数编码的版本信息。

-text

  This option prints out the EC parameters in human readable form.

  打印椭圆曲线密钥参数信息值。

-C

  This option converts the EC parameters into C code. The parameters can then be loaded by calling the get_ec_group_XXX() function.

  用C语言打印椭圆曲线参数。然后可以通过调用get_ec_group_XXX函数来加载参数。

-check

  Validate the elliptic curve parameters.

  验证椭圆曲线密钥参数。

-name arg

  Use the EC parameters with the specified 'short' name. Use -list_curves to get a list of all currently implemented EC parameters.

  使用EC参数的指定短名称。使用-list_curves来得到所有当前实现的EC参数的列表。

-list_curves

  If this options is specified ecparam will print out a list of all currently implemented EC parameters names and exit.

  打印所有可用的短名称。

-conv_form

  This specifies how the points on the elliptic curve are converted into octet strings. Possible values are: compressed (the default value), uncompressed and hybrid. For more information regarding the point conversion forms please read the X9.62 standard. Note Due to patent issues the compressed option is disabled by default for binary curves and can be enabled by defining the preprocessor macro OPENSSL_EC_BIN_PT_COMP at compile time.

  这指定椭圆曲线上的点如何转换为八位字节串。 可能的值有：压缩（默认值），未压缩和混合。 有关点转换表单的更多信息，请阅读X9.62标准。 注意由于专利问题，压缩选项默认情况下禁用二进制曲线，并且可以通过在编译时定义预处理器宏OPENSSL_EC_BIN_PT_COMP来启用。

-param_enc arg

  This specifies how the elliptic curve parameters are encoded. Possible value are: named_curve, i.e. the ec parameters are specified by an OID, or explicit where the ec parameters are explicitly given (see RFC 3279 for the definition of the EC parameters structures). The default value is named_curve. Note the implicitlyCA alternative, as specified in RFC 3279, is currently not implemented in GmSSL.

  这指定椭圆曲线参数的编码方式。 可能的值为：named_curve，即ec参数由OID指定，或显式指定ec参数（参见RFC 3279以了解EC参数结构的定义）。 默认值为named_curve。 注意，如RFC 3279所述，implicitlyCA替代方案目前尚未在GmSSL中实现

-no_seed

  This option inhibits that the 'seed' for the parameter generation is included in the ECParameters structure (see RFC 3279).

  该选项禁止参数生成“seed”包含在ECParameters结构中（参见RFC 3279）。

-genkey

  This option will generate an EC private key using the specified parameters.

  该指令会生成一个指定参数的EC私钥。

-rand file(s)

  a file or files containing random data used to seed the random number generator, or an EGD socket (see RAND_egd(3)). Multiple files can be specified separated by an OS-dependent character. The separator is ; for MS-Windows, , for OpenVMS, and : for all others.

  含有随机数产生种子的文件。

-engine id

  specifying an engine (by its unique id string) will cause ecparam to attempt to obtain a functional reference to the specified engine, thus initialising it if needed. The engine will then be set as the default for all available algorithms.

  指定硬件引擎。该引擎会被设为所有可行的算法的默认引擎。

# NOTES

PEM format EC parameters use the header and footer lines:

     -----BEGIN EC PARAMETERS-----
     -----END EC PARAMETERS-----

GmSSL is currently not able to generate new groups and therefore ecparam can only create EC parameters from known (named) curves.

# EXAMPLES

To create EC parameters with the group 'prime192v1':

      gmssl ecparam -out ec_param.pem -name prime192v1

To create EC parameters with explicit parameters:

      gmssl ecparam -out ec_param.pem -name prime192v1 -param_enc explicit

To validate given EC parameters:

      gmssl ecparam -in ec_param.pem -check

To create EC parameters and a private key:

      gmssl ecparam -out ec_key.pem -name prime192v1 -genkey

To change the point encoding to 'compressed':

      gmssl ecparam -in ec_in.pem -out ec_out.pem -conv_form compressed

To print out the EC parameters to standard output:

      gmssl ecparam -in ec_param.pem -noout -text

# SEE ALSO

ec(1), dsaparam(1)

# COPYRIGHT

Copyright 2003-2016 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the GmSSL license (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at https://www.openssl.org/source/license.html.