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    Command:

    genrsa

    
    
    

    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
               standard output is used.
    
           -passout arg
               the output file password source. For more information about the
               format of arg see the PASS PHRASE ARGUMENTS section in openssl(1).
    
           -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.
    
           -F4|-3
               the public exponent to use, either 65537 or 3. The default is
               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 others.
    
           -engine id
               specifying an engine (by its unique id string) will cause genrsa 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.
    
    
    

    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 number
           depends on the key size).
    
    
    

    1.0.1e 2013-02-11 GENRSA(1)

    
    
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