252 lines
8.3 KiB
Groff
Executable File
252 lines
8.3 KiB
Groff
Executable File
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.\" ========================================================================
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.\"
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.IX Title "OPENSSL-DHPARAM 1"
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.TH OPENSSL-DHPARAM 1 "2020-03-02" "3.0.0-dev" "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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openssl\-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\-help\fR]
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[\fB\-inform\fR \fB\s-1DER\s0\fR|\fB\s-1PEM\s0\fR]
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[\fB\-outform\fR \fB\s-1DER\s0\fR|\fB\s-1PEM\s0\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\-check\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\-3\fR]
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[\fB\-5\fR]
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[\fB\-engine\fR \fIid\fR]
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[\fB\-rand\fR \fIfiles\fR]
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[\fB\-writerand\fR \fIfile\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 has been deprecated.
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The \fIopenssl\-pkeyparam\fR\|(1) command should be used instead.
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.PP
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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\-help\fR" 4
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.IX Item "-help"
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Print out a usage message.
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.IP "\fB\-inform\fR \fB\s-1DER\s0\fR|\fB\s-1PEM\s0\fR, \fB\-outform\fR \fB\s-1DER\s0\fR|\fB\s-1PEM\s0\fR" 4
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.IX Item "-inform DER|PEM, -outform DER|PEM"
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The input format and output format; the default is \fB\s-1PEM\s0\fR.
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The object is compatible with the PKCS#3 \fBDHparameter\fR structure.
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See \*(L"Format Options\*(R" in \fIopenssl\fR\|(1) for details.
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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\-check\fR" 4
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.IX Item "-check"
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Performs numerous checks to see if the supplied parameters are valid and
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displays a warning if not.
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.IP "\fB\-2\fR, \fB\-3\fR, \fB\-5\fR" 4
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.IX Item "-2, -3, -5"
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The generator to use, either 2, 3 or 5. If present then the
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input file is ignored and parameters are generated instead. If not
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present but \fInumbits\fR is present, parameters are generated with the
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default generator 2.
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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 this option is present then
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the input file is ignored and parameters are generated instead. If
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this option is not present but a generator (\fB\-2\fR, \fB\-3\fR or \fB\-5\fR) is
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present, parameters are generated with a default length of 2048 bits.
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The minimim length is 512 bits. The maximum length is 10000 bits.
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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 \fIget_dhNNNN()\fR function.
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.IP "\fB\-engine\fR \fIid\fR" 4
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.IX Item "-engine id"
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See \*(L"Engine Options\*(R" in \fIopenssl\fR\|(1).
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.IP "\fB\-rand\fR \fIfiles\fR, \fB\-writerand\fR \fIfile\fR" 4
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.IX Item "-rand files, -writerand file"
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See \*(L"Random State Options\*(R" in \fIopenssl\fR\|(1) for details.
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.SH "NOTES"
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.IX Header "NOTES"
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This command replaces the \fBdh\fR and \fBgendh\fR commands of previous
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releases.
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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 command 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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\&\fIopenssl\fR\|(1),
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\&\fIopenssl\-pkeyparam\fR\|(1),
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\&\fIopenssl\-dsaparam\fR\|(1)
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.SH "HISTORY"
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.IX Header "HISTORY"
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This command was deprecated in OpenSSL 3.0.
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2000\-2019 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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