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.\" ========================================================================
.\"
.IX Title "SPKAC 1"
.TH SPKAC 1 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
openssl\-spkac, spkac \- SPKAC printing and generating utility
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
\&\fBopenssl\fR \fBspkac\fR
[\fB\-help\fR]
[\fB\-in filename\fR]
[\fB\-out filename\fR]
[\fB\-key keyfile\fR]
[\fB\-keyform PEM|DER|ENGINE\fR]
[\fB\-passin arg\fR]
[\fB\-challenge string\fR]
[\fB\-pubkey\fR]
[\fB\-spkac spkacname\fR]
[\fB\-spksect section\fR]
[\fB\-noout\fR]
[\fB\-verify\fR]
[\fB\-engine id\fR]
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \fBspkac\fR command processes Netscape signed public key and challenge
(\s-1SPKAC\s0) files. It can print out their contents, verify the signature and
produce its own SPKACs from a supplied private key.
.SH "OPTIONS"
.IX Header "OPTIONS"
.IP "\fB\-help\fR" 4
.IX Item "-help"
Print out a usage message.
.IP "\fB\-in filename\fR" 4
.IX Item "-in filename"
This specifies the input filename to read from or standard input if this
option is not specified. Ignored if the \fB\-key\fR option is used.
.IP "\fB\-out filename\fR" 4
.IX Item "-out filename"
Specifies the output filename to write to or standard output by
default.
.IP "\fB\-key keyfile\fR" 4
.IX Item "-key keyfile"
Create an \s-1SPKAC\s0 file using the private key in \fBkeyfile\fR. The
\&\fB\-in\fR, \fB\-noout\fR, \fB\-spksect\fR and \fB\-verify\fR options are ignored if
present.
.IP "\fB\-keyform PEM|DER|ENGINE\fR" 4
.IX Item "-keyform PEM|DER|ENGINE"
Whether the key format is \s-1PEM, DER,\s0 or an engine-backed key.
The default is \s-1PEM.\s0
.IP "\fB\-passin password\fR" 4
.IX Item "-passin password"
The input file password source. For more information about the format of \fBarg\fR
see \*(L"Pass Phrase Options\*(R" in \fBopenssl\fR\|(1).
.IP "\fB\-challenge string\fR" 4
.IX Item "-challenge string"
Specifies the challenge string if an \s-1SPKAC\s0 is being created.
.IP "\fB\-spkac spkacname\fR" 4
.IX Item "-spkac spkacname"
Allows an alternative name form the variable containing the
\&\s-1SPKAC.\s0 The default is \*(L"\s-1SPKAC\*(R".\s0 This option affects both
generated and input \s-1SPKAC\s0 files.
.IP "\fB\-spksect section\fR" 4
.IX Item "-spksect section"
Allows an alternative name form the section containing the
\&\s-1SPKAC.\s0 The default is the default section.
.IP "\fB\-noout\fR" 4
.IX Item "-noout"
Don't output the text version of the \s-1SPKAC\s0 (not used if an
\&\s-1SPKAC\s0 is being created).
.IP "\fB\-pubkey\fR" 4
.IX Item "-pubkey"
Output the public key of an \s-1SPKAC\s0 (not used if an \s-1SPKAC\s0 is
being created).
.IP "\fB\-verify\fR" 4
.IX Item "-verify"
Verifies the digital signature on the supplied \s-1SPKAC.\s0
.IP "\fB\-engine id\fR" 4
.IX Item "-engine id"
Specifying an engine (by its unique \fBid\fR string) will cause \fBspkac\fR
to attempt to obtain a functional reference to the specified engine,
thus initialising it if needed. The engine will then be set as the default
for all available algorithms.
.SH "EXAMPLES"
.IX Header "EXAMPLES"
Print out the contents of an \s-1SPKAC:\s0
.PP
.Vb 1
\& openssl spkac \-in spkac.cnf
.Ve
.PP
Verify the signature of an \s-1SPKAC:\s0
.PP
.Vb 1
\& openssl spkac \-in spkac.cnf \-noout \-verify
.Ve
.PP
Create an \s-1SPKAC\s0 using the challenge string \*(L"hello\*(R":
.PP
.Vb 1
\& openssl spkac \-key key.pem \-challenge hello \-out spkac.cnf
.Ve
.PP
Example of an \s-1SPKAC,\s0 (long lines split up for clarity):
.PP
.Vb 6
\& SPKAC=MIG5MGUwXDANBgkqhkiG9w0BAQEFAANLADBIAkEA\e
\& 1cCoq2Wa3Ixs47uI7FPVwHVIPDx5yso105Y6zpozam135a\e
\& 8R0CpoRvkkigIyXfcCjiVi5oWk+6FfPaD03uPFoQIDAQAB\e
\& FgVoZWxsbzANBgkqhkiG9w0BAQQFAANBAFpQtY/FojdwkJ\e
\& h1bEIYuc2EeM2KHTWPEepWYeawvHD0gQ3DngSC75YCWnnD\e
\& dq+NQ3F+X4deMx9AaEglZtULwV4=
.Ve
.SH "NOTES"
.IX Header "NOTES"
A created \s-1SPKAC\s0 with suitable \s-1DN\s0 components appended can be fed into
the \fBca\fR utility.
.PP
SPKACs are typically generated by Netscape when a form is submitted
containing the \fB\s-1KEYGEN\s0\fR tag as part of the certificate enrollment
process.
.PP
The challenge string permits a primitive form of proof of possession
of private key. By checking the \s-1SPKAC\s0 signature and a random challenge
string some guarantee is given that the user knows the private key
corresponding to the public key being certified. This is important in
some applications. Without this it is possible for a previous \s-1SPKAC\s0
to be used in a \*(L"replay attack\*(R".
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBca\fR\|(1)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2000\-2021 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (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>.