247 lines
8.1 KiB
Groff
247 lines
8.1 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "DHPARAM 1"
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.TH DHPARAM 1 "2014-04-07" "1.0.1g" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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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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.IX Header "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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[\fB\-engine id\fR]
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[\fInumbits\fR]
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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This command is used to manipulate \s-1DH\s0 parameter files.
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.SH "OPTIONS"
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.IX Header "OPTIONS"
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.IP "\fB\-inform DER|PEM\fR" 4
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.IX Item "-inform DER|PEM"
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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 PKCS#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 DER|PEM\fR" 4
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.IX Item "-outform DER|PEM"
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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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.IX Item "-in filename"
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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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.IX Item "-out filename"
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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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.IX Item "-dsaparam"
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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 DSA-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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.IX Item "-2, -5"
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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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.IX Item "-rand file(s)"
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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 \fIRAND_egd\fR\|(3)).
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Multiple files can be specified separated by a OS-dependent character.
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The separator is \fB;\fR for MS-Windows, \fB,\fR for OpenVMS, and \fB:\fR for
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all others.
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.IP "\fInumbits\fR" 4
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.IX Item "numbits"
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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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.IX Item "-noout"
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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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.IX Item "-text"
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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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.IX Item "-C"
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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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.IP "\fB\-engine id\fR" 4
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.IX Item "-engine id"
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specifying an engine (by its unique \fBid\fR string) will cause \fBdhparam\fR
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to attempt to obtain a functional reference to the specified engine,
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thus initialising it if needed. The engine will then be set as the default
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for all available algorithms.
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.SH "WARNINGS"
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.IX Header "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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.IX Header "NOTES"
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\&\s-1PEM\s0 format \s-1DH\s0 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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.PP
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OpenSSL currently only supports the older PKCS#3 \s-1DH\s0, not the newer X9.42
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\&\s-1DH\s0.
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.PP
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This program manipulates \s-1DH\s0 parameters not keys.
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.SH "BUGS"
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.IX Header "BUGS"
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There should be a way to generate and manipulate \s-1DH\s0 keys.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIdsaparam\fR\|(1)
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.SH "HISTORY"
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.IX Header "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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