321 lines
8.3 KiB
Groff
321 lines
8.3 KiB
Groff
.rn '' }`
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'''
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'''
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.de Sh
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.br
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'''
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'''
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''' Set up \*(-- to give an unbreakable dash;
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''' string Tr holds user defined translation string.
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''' Bell System Logo is used as a dummy character.
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'''
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.tr \(*W-|\(bv\*(Tr
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.ie n \{\
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.ds -- \(*W-
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.ds PI pi
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.if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
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''' \*(M", \*(S", \*(N" and \*(T" are the equivalent of
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''' \*(L" and \*(R", except that they are used on ".xx" lines,
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''' such as .IP and .SH, which do another additional levels of
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.\" If the F register is turned on, we'll generate
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.\" index entries out stderr for the following things:
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.\" TH Title
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.\" SH Header
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.\" Sh Subsection
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.\" Ip Item
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.\" X<> Xref (embedded
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.\" Of course, you have to process the output yourself
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.\" in some meaninful fashion.
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.rr F
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.\}
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.TH DHPARAM 1 "0.9.5a" "22/Jul/2000" "OpenSSL"
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.UC
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.if n .hy 0
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.if n .na
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.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
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.\" @(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2
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.if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
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.if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u'
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. \" for low resolution devices (crt and lpr)
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.if \n(.H>23 .if \n(.V>19 \
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\{\
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.\}
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.rm #[ #] #H #V #F C
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.SH "NAME"
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dhparam \- DH parameter manipulation and generation
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.SH "SYNOPSIS"
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\fBopenssl dhparam\fR
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[\fB\-inform DER|PEM\fR]
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[\fB\-outform DER|PEM\fR]
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[\fB\-in\fR \fIfilename\fR]
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[\fB\-out\fR \fIfilename\fR]
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[\fB\-dsaparam\fR]
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[\fB\-noout\fR]
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[\fB\-text\fR]
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[\fB\-C\fR]
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[\fB\-2\fR]
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[\fB\-5\fR]
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[\fB\-rand\fR \fIfile(s)\fR]
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[\fInumbits\fR]
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.SH "DESCRIPTION"
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This command is used to manipulate DH parameter files.
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.SH "OPTIONS"
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.Ip "\fB\-inform \s-1DER\s0|\s-1PEM\s0\fR" 4
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This specifies the input format. The \fB\s-1DER\s0\fR option uses an \s-1ASN1\s0 \s-1DER\s0 encoded
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form compatible with the \s-1PKCS\s0#3 DHparameter structure. The \s-1PEM\s0 form is the
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default format: it consists of the \fB\s-1DER\s0\fR format base64 encoded with
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additional header and footer lines.
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.Ip "\fB\-outform \s-1DER\s0|\s-1PEM\s0\fR" 4
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This specifies the output format, the options have the same meaning as the
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\fB\-inform\fR option.
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.Ip "\fB\-in\fR \fIfilename\fR" 4
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This specifies the input filename to read parameters from or standard input if
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this option is not specified.
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.Ip "\fB\-out\fR \fIfilename\fR" 4
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This specifies the output filename parameters to. Standard output is used
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if this option is not present. The output filename should \fBnot\fR be the same
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as the input filename.
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.Ip "\fB\-dsaparam\fR" 4
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If this option is used, \s-1DSA\s0 rather than \s-1DH\s0 parameters are read or created;
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they are converted to \s-1DH\s0 format. Otherwise, \*(L"strong\*(R" primes (such
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that (p-1)/2 is also prime) will be used for \s-1DH\s0 parameter generation.
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.Sp
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\s-1DH\s0 parameter generation with the \fB\-dsaparam\fR option is much faster,
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and the recommended exponent length is shorter, which makes \s-1DH\s0 key
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exchange more efficient. Beware that with such \s-1DSA\s0\-style \s-1DH\s0
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parameters, a fresh \s-1DH\s0 key should be created for each use to
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avoid small-subgroup attacks that may be possible otherwise.
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.Ip "\fB\-2\fR, \fB\-5\fR" 4
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The generator to use, either 2 or 5. 2 is the default. If present then the
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input file is ignored and parameters are generated instead.
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.Ip "\fB\-rand\fR \fIfile(s)\fR" 4
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a file or files containing random data used to seed the random number
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generator, or an \s-1EGD\s0 socket (see the \fIRAND_egd(3)|RAND_egd(3)\fR manpage).
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Multiple files can be specified separated by a \s-1OS\s0\-dependent character.
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The separator is \fB;\fR for \s-1MS\s0\-Windows, \fB,\fR for OpenVSM, and \fB:\fR for
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all others.
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.Ip "\fInumbits\fR" 4
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this option specifies that a parameter set should be generated of size
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\fInumbits\fR. It must be the last option. If not present then a value of 512
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is used. If this option is present then the input file is ignored and
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parameters are generated instead.
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.Ip "\fB\-noout\fR" 4
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this option inhibits the output of the encoded version of the parameters.
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.Ip "\fB\-text\fR" 4
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this option prints out the \s-1DH\s0 parameters in human readable form.
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.Ip "\fB\-C\fR" 4
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this option converts the parameters into C code. The parameters can then
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be loaded by calling the \fBget_dh\fR\fInumbits\fR\fB()\fR function.
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.SH "WARNINGS"
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The program \fBdhparam\fR combines the functionality of the programs \fBdh\fR and
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\fBgendh\fR in previous versions of OpenSSL and SSLeay. The \fBdh\fR and \fBgendh\fR
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programs are retained for now but may have different purposes in future
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versions of OpenSSL.
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.SH "NOTES"
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PEM format DH parameters use the header and footer lines:
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.PP
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.Vb 2
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\& -----BEGIN DH PARAMETERS-----
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\& -----END DH PARAMETERS-----
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.Ve
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OpenSSL currently only supports the older PKCS#3 DH, not the newer X9.42
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DH.
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.PP
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This program manipulates DH parameters not keys.
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.SH "BUGS"
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There should be a way to generate and manipulate DH keys.
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.SH "SEE ALSO"
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the \fIdsaparam(1)|dsaparam(1)\fR manpage
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.SH "HISTORY"
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The \fBdhparam\fR command was added in OpenSSL 0.9.5.
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The \fB\-dsaparam\fR option was added in OpenSSL 0.9.6.
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.rn }` ''
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.IX Title "DHPARAM 1"
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.IX Name "dhparam - DH parameter manipulation and generation"
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.IX Header "NAME"
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.IX Header "SYNOPSIS"
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.IX Header "DESCRIPTION"
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.IX Header "OPTIONS"
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.IX Item "\fB\-inform \s-1DER\s0|\s-1PEM\s0\fR"
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.IX Item "\fB\-outform \s-1DER\s0|\s-1PEM\s0\fR"
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.IX Item "\fB\-in\fR \fIfilename\fR"
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.IX Item "\fB\-out\fR \fIfilename\fR"
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.IX Item "\fB\-dsaparam\fR"
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.IX Item "\fB\-2\fR, \fB\-5\fR"
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.IX Item "\fB\-rand\fR \fIfile(s)\fR"
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.IX Item "\fInumbits\fR"
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.IX Item "\fB\-noout\fR"
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.IX Item "\fB\-text\fR"
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.IX Item "\fB\-C\fR"
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.IX Header "WARNINGS"
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.IX Header "NOTES"
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.IX Header "BUGS"
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.IX Header "SEE ALSO"
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.IX Header "HISTORY"
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