1DSA(1)                              OpenSSL                             DSA(1)
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NAME

6       openssl-dsa, dsa - DSA key processing
7

SYNOPSIS

9       openssl dsa [-help] [-inform PEM|DER] [-outform PEM|DER] [-in filename]
10       [-passin arg] [-out filename] [-passout arg] [-aes128] [-aes192]
11       [-aes256] [-aria128] [-aria192] [-aria256] [-camellia128]
12       [-camellia192] [-camellia256] [-des] [-des3] [-idea] [-text] [-noout]
13       [-modulus] [-pubin] [-pubout] [-engine id]
14

DESCRIPTION

16       The dsa command processes DSA keys. They can be converted between
17       various forms and their components printed out. Note This command uses
18       the traditional SSLeay compatible format for private key encryption:
19       newer applications should use the more secure PKCS#8 format using the
20       pkcs8
21

OPTIONS

23       -help
24           Print out a usage message.
25
26       -inform DER|PEM
27           This specifies the input format. The DER option with a private key
28           uses an ASN1 DER encoded form of an ASN.1 SEQUENCE consisting of
29           the values of version (currently zero), p, q, g, the public and
30           private key components respectively as ASN.1 INTEGERs. When used
31           with a public key it uses a SubjectPublicKeyInfo structure: it is
32           an error if the key is not DSA.
33
34           The PEM form is the default format: it consists of the DER format
35           base64 encoded with additional header and footer lines. In the case
36           of a private key PKCS#8 format is also accepted.
37
38       -outform DER|PEM
39           This specifies the output format, the options have the same meaning
40           and default as the -inform option.
41
42       -in filename
43           This specifies the input filename to read a key from or standard
44           input if this option is not specified. If the key is encrypted a
45           pass phrase will be prompted for.
46
47       -passin arg
48           The input file password source. For more information about the
49           format of arg see the PASS PHRASE ARGUMENTS section in openssl(1).
50
51       -out filename
52           This specifies the output filename to write a key to or standard
53           output by is not specified. If any encryption options are set then
54           a pass phrase will be prompted for. The output filename should not
55           be the same as the input filename.
56
57       -passout arg
58           The output file password source. For more information about the
59           format of arg see the PASS PHRASE ARGUMENTS section in openssl(1).
60
61       -aes128, -aes192, -aes256, -aria128, -aria192, -aria256, -camellia128,
62       -camellia192, -camellia256, -des, -des3, -idea
63           These options encrypt the private key with the specified cipher
64           before outputting it. A pass phrase is prompted for.  If none of
65           these options is specified the key is written in plain text. This
66           means that using the dsa utility to read in an encrypted key with
67           no encryption option can be used to remove the pass phrase from a
68           key, or by setting the encryption options it can be use to add or
69           change the pass phrase.  These options can only be used with PEM
70           format output files.
71
72       -text
73           Prints out the public, private key components and parameters.
74
75       -noout
76           This option prevents output of the encoded version of the key.
77
78       -modulus
79           This option prints out the value of the public key component of the
80           key.
81
82       -pubin
83           By default, a private key is read from the input file. With this
84           option a public key is read instead.
85
86       -pubout
87           By default, a private key is output. With this option a public key
88           will be output instead. This option is automatically set if the
89           input is a public key.
90
91       -engine id
92           Specifying an engine (by its unique id string) will cause dsa to
93           attempt to obtain a functional reference to the specified engine,
94           thus initialising it if needed. The engine will then be set as the
95           default for all available algorithms.
96

NOTES

98       The PEM private key format uses the header and footer lines:
99
100        -----BEGIN DSA PRIVATE KEY-----
101        -----END DSA PRIVATE KEY-----
102
103       The PEM public key format uses the header and footer lines:
104
105        -----BEGIN PUBLIC KEY-----
106        -----END PUBLIC KEY-----
107

EXAMPLES

109       To remove the pass phrase on a DSA private key:
110
111        openssl dsa -in key.pem -out keyout.pem
112
113       To encrypt a private key using triple DES:
114
115        openssl dsa -in key.pem -des3 -out keyout.pem
116
117       To convert a private key from PEM to DER format:
118
119        openssl dsa -in key.pem -outform DER -out keyout.der
120
121       To print out the components of a private key to standard output:
122
123        openssl dsa -in key.pem -text -noout
124
125       To just output the public part of a private key:
126
127        openssl dsa -in key.pem -pubout -out pubkey.pem
128

SEE ALSO

130       dsaparam(1), gendsa(1), rsa(1), genrsa(1)
131

133       Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.
134
135       Licensed under the OpenSSL license (the "License").  You may not use
136       this file except in compliance with the License.  You can obtain a copy
137       in the file LICENSE in the source distribution or at
138       <https://www.openssl.org/source/license.html>.
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1421.1.1g                            2020-04-23                            DSA(1)
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