[手册] OpenSSL 之 genrsa 命令

GENRSA(1)      OpenSSL       GENRSA(1)

 

 

 

NAME
       genrsa - generate an RSA private key

 

# 注释 ：genrsa 用于生成一个 RSA 私钥

 

SYNOPSIS
       openssl genrsa [-out filename] [-passout arg] [-des] [-des3] [-idea] [-f4] [-3] [-rand file(s)] [-engine id] [numbits]

 

DESCRIPTION

       The genrsa command generates an RSA private key.

 

 

OPTIONS
       -out filename
    the output filename. If this argument is not specified then stan-
    dard output is used.

 

        # 注释 ：-out 表示把私钥输出到某个文件，否则输出到 stdout

 

       -passout arg
    the output file password source. For more information about the
    format of arg see the PASS PHRASE ARGUMENTS section in openssl(1).

 

        # 注释 ：-passout 用于指定用什么口令句来加密输出文件（例如 private key）

 

       -des│-des3│-idea
    These options encrypt the private key with the DES, triple DES, or
    the IDEA ciphers respectively before outputting it. If none of
    these options is specified no encryption is used. If encryption is
    used a pass phrase is prompted for if it is not supplied via the
    -passout argument.

 

        # 注释 ：-des|des3|-idea 选择在输出 private key 前用什么 Ciper 加密，可以有 DES、triple-DES、IDEA

 

        # 如果一个都没有指定，则默认不加密，如果选择了其中一个，则提示输入一个口令句，如果没有给出 -passout 选项的话

 

       -F4│-3
    the public exponent to use, either 65537 or 3. The default is 65537.

 

        # 注释 ：-F4 或者 -3 设置使用的 exponent ，要么 65537 ，要么3，默认是 65537

 

       -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 a OS-dependent character.  The
    separator is ; for MS-Windows, , for OpenVMS, and : for all oth-
    ers.

 

        # 注释 ：-rand 指定一个随机数种子文件。可以指定多个文件，彼此之间的分隔符则取决于 OS 。

 

        # 如果是 Windows 则是分号，如果是其他操作系统则是冒号

 

       -engine id
    specifying an engine (by it’s unique id string) will cause req 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.

 

 

 

       numbits
    the size of the private key to generate in bits. This must be the
    last option specified. The default is 512.

 

        # 注释 ： 是 private key 的长度，默认是 512 ，最大是 1024

 

NOTES
       RSA private key generation essentially involves the generation of two
       prime numbers. When generating a private key various symbols will be
       output to indicate the progress of the generation. A . represents each
       number which has passed an initial sieve test, + means a number has
       passed a single round of the Miller-Rabin primality test. A newline
       means that the number has passed all the prime tests (the actual num-
       ber depends on the key size).

 

       Because key generation is a random process the time taken to generate
       a key may vary somewhat.

 

BUGS
       A quirk of the prime generation algorithm is that it cannot generate
       small primes. Therefore the number of bits should not be less that 64.
       For typical private keys this will not matter because for security
       reasons they will be much larger (typically 1024 bits).

 

SEE ALSO
       gendsa(1)

 

 

 

0.9.7a      2003-01-30       GENRSA(1)