Android_verify/third_party/android-libs/share/man/man1/openssl-dsa.1ossl

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.\" ========================================================================
.\"
.IX Title "OPENSSL-DSA 1ossl"
.TH OPENSSL-DSA 1ossl "2025-06-29" "3.3.2" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
openssl\-dsa \- DSA key processing
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
\&\fBopenssl\fR \fBdsa\fR
[\fB\-help\fR]
[\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]
[\fB\-in\fR \fIfilename\fR]
[\fB\-passin\fR \fIarg\fR]
[\fB\-out\fR \fIfilename\fR]
[\fB\-passout\fR \fIarg\fR]
[\fB\-aes128\fR]
[\fB\-aes192\fR]
[\fB\-aes256\fR]
[\fB\-aria128\fR]
[\fB\-aria192\fR]
[\fB\-aria256\fR]
[\fB\-camellia128\fR]
[\fB\-camellia192\fR]
[\fB\-camellia256\fR]
[\fB\-des\fR]
[\fB\-des3\fR]
[\fB\-idea\fR]
[\fB\-text\fR]
[\fB\-noout\fR]
[\fB\-modulus\fR]
[\fB\-pubin\fR]
[\fB\-pubout\fR]
[\fB\-pvk\-strong\fR]
[\fB\-pvk\-weak\fR]
[\fB\-pvk\-none\fR]
[\fB\-engine\fR \fIid\fR]
[\fB\-provider\fR \fIname\fR]
[\fB\-provider\-path\fR \fIpath\fR]
[\fB\-propquery\fR \fIpropq\fR]
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This command processes \s-1DSA\s0 keys. They can be converted between various
forms and their components printed out. \fBNote\fR This command uses the
traditional SSLeay compatible format for private key encryption: newer
applications should use the more secure PKCS#8 format using the \fBpkcs8\fR
.SH "OPTIONS"
.IX Header "OPTIONS"
.IP "\fB\-help\fR" 4
.IX Item "-help"
Print out a usage message.
.IP "\fB\-inform\fR \fB\s-1DER\s0\fR|\fB\s-1PEM\s0\fR" 4
.IX Item "-inform DER|PEM"
The key input format; unspecified by default.
See \fBopenssl\-format\-options\fR\|(1) for details.
.IP "\fB\-outform\fR \fB\s-1DER\s0\fR|\fB\s-1PEM\s0\fR" 4
.IX Item "-outform DER|PEM"
The key output format; the default is \fB\s-1PEM\s0\fR.
See \fBopenssl\-format\-options\fR\|(1) for details.
.Sp
Private keys are a sequence of \fB\s-1ASN.1 INTEGERS\s0\fR: the version (zero), \fBp\fR,
\&\fBq\fR, \fBg\fR, and the public and private key components.  Public keys
are a \fBSubjectPublicKeyInfo\fR structure with the \fB\s-1DSA\s0\fR type.
.Sp
The \fB\s-1PEM\s0\fR format also accepts PKCS#8 data.
.IP "\fB\-in\fR \fIfilename\fR" 4
.IX Item "-in filename"
This specifies the input filename to read a key from or standard input if this
option is not specified. If the key is encrypted a pass phrase will be
prompted for.
.IP "\fB\-out\fR \fIfilename\fR" 4
.IX Item "-out filename"
This specifies the output filename to write a key to or standard output by
is not specified. If any encryption options are set then a pass phrase will be
prompted for. The output filename should \fBnot\fR be the same as the input
filename.
.IP "\fB\-passin\fR \fIarg\fR, \fB\-passout\fR \fIarg\fR" 4
.IX Item "-passin arg, -passout arg"
The password source for the input and output file.
For more information about the format of \fBarg\fR
see \fBopenssl\-passphrase\-options\fR\|(1).
.IP "\fB\-aes128\fR, \fB\-aes192\fR, \fB\-aes256\fR, \fB\-aria128\fR, \fB\-aria192\fR, \fB\-aria256\fR, \fB\-camellia128\fR, \fB\-camellia192\fR, \fB\-camellia256\fR, \fB\-des\fR, \fB\-des3\fR, \fB\-idea\fR" 4
.IX Item "-aes128, -aes192, -aes256, -aria128, -aria192, -aria256, -camellia128, -camellia192, -camellia256, -des, -des3, -idea"
These options encrypt the private key with the specified
cipher before outputting it. A pass phrase is prompted for.
If none of these options is specified the key is written in plain text. This
means that this command can be used to remove the pass phrase from a key
by not giving any encryption option is given, or to add or change the pass
phrase by setting them.
These options can only be used with \s-1PEM\s0 format output files.
.IP "\fB\-text\fR" 4
.IX Item "-text"
Prints out the public, private key components and parameters.
.IP "\fB\-noout\fR" 4
.IX Item "-noout"
This option prevents output of the encoded version of the key.
.IP "\fB\-modulus\fR" 4
.IX Item "-modulus"
This option prints out the value of the public key component of the key.
.IP "\fB\-pubin\fR" 4
.IX Item "-pubin"
By default, a private key is read from the input.
With this option a public key is read instead.
If the input contains no public key but a private key, its public part is used.
.IP "\fB\-pubout\fR" 4
.IX Item "-pubout"
By default, a private key is output. With this option a public
key will be output instead. This option is automatically set if the input is
a public key.
.IP "\fB\-pvk\-strong\fR" 4
.IX Item "-pvk-strong"
Enable 'Strong' \s-1PVK\s0 encoding level (default).
.IP "\fB\-pvk\-weak\fR" 4
.IX Item "-pvk-weak"
Enable 'Weak' \s-1PVK\s0 encoding level.
.IP "\fB\-pvk\-none\fR" 4
.IX Item "-pvk-none"
Don't enforce \s-1PVK\s0 encoding.
.IP "\fB\-engine\fR \fIid\fR" 4
.IX Item "-engine id"
See \*(L"Engine Options\*(R" in \fBopenssl\fR\|(1).
This option is deprecated.
.IP "\fB\-provider\fR \fIname\fR" 4
.IX Item "-provider name"
.PD 0
.IP "\fB\-provider\-path\fR \fIpath\fR" 4
.IX Item "-provider-path path"
.IP "\fB\-propquery\fR \fIpropq\fR" 4
.IX Item "-propquery propq"
.PD
See \*(L"Provider Options\*(R" in \fBopenssl\fR\|(1), \fBprovider\fR\|(7), and \fBproperty\fR\|(7).
.PP
The \fBopenssl\-pkey\fR\|(1) command is capable of performing all the operations
this command can, as well as supporting other public key types.
.SH "EXAMPLES"
.IX Header "EXAMPLES"
The documentation for the \fBopenssl\-pkey\fR\|(1) command contains examples
equivalent to the ones listed here.
.PP
To remove the pass phrase on a \s-1DSA\s0 private key:
.PP
.Vb 1
\& openssl dsa \-in key.pem \-out keyout.pem
.Ve
.PP
To encrypt a private key using triple \s-1DES:\s0
.PP
.Vb 1
\& openssl dsa \-in key.pem \-des3 \-out keyout.pem
.Ve
.PP
To convert a private key from \s-1PEM\s0 to \s-1DER\s0 format:
.PP
.Vb 1
\& openssl dsa \-in key.pem \-outform DER \-out keyout.der
.Ve
.PP
To print out the components of a private key to standard output:
.PP
.Vb 1
\& openssl dsa \-in key.pem \-text \-noout
.Ve
.PP
To just output the public part of a private key:
.PP
.Vb 1
\& openssl dsa \-in key.pem \-pubout \-out pubkey.pem
.Ve
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBopenssl\fR\|(1),
\&\fBopenssl\-pkey\fR\|(1),
\&\fBopenssl\-dsaparam\fR\|(1),
\&\fBopenssl\-gendsa\fR\|(1),
\&\fBopenssl\-rsa\fR\|(1),
\&\fBopenssl\-genrsa\fR\|(1)
.SH "HISTORY"
.IX Header "HISTORY"
The \fB\-engine\fR option was deprecated in OpenSSL 3.0.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2000\-2023 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.