openssl-spkac - SPKAC printing and generating command
openssl spkac [
-help] [
-in filename] [
-out filename] [
-digest digest] [
-key
filename|
uri] [
-keyform
DER|
PEM|
P12|
ENGINE] [
-passin arg]
[
-challenge string] [
-pubkey] [
-spkac
spkacname] [
-spksect section] [
-noout] [
-verify] [
-engine id] [
-provider name] [
-provider-path path] [
-propquery propq]
This command processes Netscape signed public key and challenge (SPKAC) files.
It can print out their contents, verify the signature and produce its own
SPKACs from a supplied private key.
- -help
- Print out a usage message.
-
-in filename
- This specifies the input filename to read from or standard
input if this option is not specified. Ignored if the -key option
is used.
-
-out filename
- Specifies the output filename to write to or standard
output by default.
-
-digest digest
- Use the specified digest to sign a created SPKAC
file. The default digest algorithm is MD5.
-
-key filename|uri
- Create an SPKAC file using the private key specified by
filename or uri. The -in, -noout,
-spksect and -verify options are ignored if present.
-
-keyform
DER|PEM|P12|ENGINE
- The key format; unspecified by default. See
openssl-format-options(1) for details.
-
-passin arg
- The input file password source. For more information about
the format of arg see openssl-passphrase-options(1).
-
-challenge string
- Specifies the challenge string if an SPKAC is being
created.
-
-spkac spkacname
- Allows an alternative name form the variable containing the
SPKAC. The default is "SPKAC". This option affects both
generated and input SPKAC files.
-
-spksect section
- Allows an alternative name form the section containing the
SPKAC. The default is the default section.
- -noout
- Don't output the text version of the SPKAC (not used if an
SPKAC is being created).
- -pubkey
- Output the public key of an SPKAC (not used if an SPKAC is
being created).
- -verify
- Verifies the digital signature on the supplied SPKAC.
-
-engine id
- See "Engine Options" in openssl(1). This
option is deprecated.
-
-provider name
-
-provider-path path
-
-propquery propq
- See "Provider Options" in openssl(1),
provider(7), and property(7).
Print out the contents of an SPKAC:
openssl spkac -in spkac.cnf
Verify the signature of an SPKAC:
openssl spkac -in spkac.cnf -noout -verify
Create an SPKAC using the challenge string "hello":
openssl spkac -key key.pem -challenge hello -out spkac.cnf
Example of an SPKAC, (long lines split up for clarity):
SPKAC=MIG5MGUwXDANBgkqhkiG9w0BAQEFAANLADBIAkEA\
1cCoq2Wa3Ixs47uI7FPVwHVIPDx5yso105Y6zpozam135a\
8R0CpoRvkkigIyXfcCjiVi5oWk+6FfPaD03uPFoQIDAQAB\
FgVoZWxsbzANBgkqhkiG9w0BAQQFAANBAFpQtY/FojdwkJ\
h1bEIYuc2EeM2KHTWPEepWYeawvHD0gQ3DngSC75YCWnnD\
dq+NQ3F+X4deMx9AaEglZtULwV4=
A created SPKAC with suitable DN components appended can be fed to
openssl-ca(1).
SPKACs are typically generated by Netscape when a form is submitted containing
the
KEYGEN tag as part of the certificate enrollment process.
The challenge string permits a primitive form of proof of possession of private
key. By checking the SPKAC 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 SPKAC to be used in a "replay
attack".
openssl(1),
openssl-ca(1)
The
-engine option was deprecated in OpenSSL 3.0.
The
-digest option was added in OpenSSL 3.0.
Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the Apache License 2.0 (the "License"). You may not use
this file except in compliance with the License. You can obtain a copy in the
file LICENSE in the source distribution or at
<
https://www.openssl.org/source/license.html>.