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    Command:

    dhparam

    
    
    

    SYNOPSIS

           openssl dhparam [-inform DER|PEM] [-outform DER|PEM] [-in filename]
           [-out filename] [-dsaparam] [-noout] [-text] [-C] [-2] [-5] [-rand
           file(s)] [-engine id] [numbits]
    
    
    

    DESCRIPTION

           This command is used to manipulate DH parameter files.
    
    
    

    OPTIONS

           -inform DER|PEM
               This specifies the input format. The DER option uses an ASN1 DER
               encoded form compatible with the PKCS#3 DHparameter structure. The
               PEM form is the default format: it consists of the DER format
               base64 encoded with additional header and footer lines.
    
           -outform DER|PEM
               This specifies the output format, the options have the same meaning
               as the -inform option.
    
           -in filename
               This specifies the input filename to read parameters from or
               standard input if this option is not specified.
    
           -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.
    
           -dsaparam
               If this option is used, DSA rather than DH parameters are read or
               created; they are converted to DH format.  Otherwise, "strong"
               primes (such that (p-1)/2 is also prime) will be used for DH
               parameter generation.
    
               DH parameter generation with the -dsaparam option is much faster,
               and the recommended exponent length is shorter, which makes DH key
               exchange more efficient.  Beware that with such DSA-style DH
               parameters, a fresh DH key should be created for each use to avoid
               small-subgroup attacks that may be possible otherwise.
    
           -2, -5
               The generator to use, either 2 or 5. 2 is the default. If present
               then the input file is ignored and parameters are generated
               instead.
    
           -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.
    
           numbits
    
           -engine id
               specifying an engine (by its unique id string) will cause dhparam
               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.
    
    
    

    WARNINGS

           The program dhparam combines the functionality of the programs dh and
           gendh in previous versions of OpenSSL and SSLeay. The dh and gendh
           programs are retained for now but may have different purposes in future
           versions of OpenSSL.
    
    
    

    NOTES

           PEM format DH parameters use the header and footer lines:
    
            -----BEGIN DH PARAMETERS-----
            -----END DH PARAMETERS-----
    
           OpenSSL currently only supports the older PKCS#3 DH, not the newer
           X9.42 DH.
    
           This program manipulates DH parameters not keys.
    
    
    

    BUGS

           There should be a way to generate and manipulate DH keys.
    
    
    

    SEE ALSO

           dsaparam(1)
    
    
    

    HISTORY

           The dhparam command was added in OpenSSL 0.9.5.  The -dsaparam option
           was added in OpenSSL 0.9.6.
    
    
    

    1.0.1e 2013-02-11 DHPARAM(1)

    
    
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