HP Open Source Security for OpenVMS Volume 2:...

OpenSSL Command Line Interface (CLI) Reference

dgst

dsa

NAME

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  

 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
  
  this option specifies that a parameter set should be generated of size numbits. It must be the last option. If not present then a value of 512 is used. If this option is present then the input file is ignored and parameters are generated instead.



• -noout
  
  this option inhibits the output of the encoded version of the parameters.



• -text
  
  this option prints out the DH parameters in human readable form.



• -C
  
  this option converts the parameters into C code. The parameters can then be loaded by calling the get_dhnumbits() function.



• -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.

 WARNINGS  

 NOTES  

 -----BEGIN DH PARAMETERS-----
 -----END DH PARAMETERS-----

This program manipulates DH parameters not keys.

 Restrictions  

 SEE ALSO  

 HISTORY  

dgst

dsa