signver(1) NSS Security Tools signver(1)
NAME
signver - Verify a detached PKCS#7 signature for a file.
SYNOPSIS
signtool -A | -V -d directory [-a] [-i input_file] [-o output_file]
[-s signature_file] [-v]
STATUS
This documentation is still work in progress. Please contribute to the
initial review in Mozilla NSS bug 836477[1]
DESCRIPTION
The Signature Verification Tool, signver, is a simple command-line
utility that unpacks a base-64-encoded PKCS#7 signed object and
verifies the digital signature using standard cryptographic techniques.
The Signature Verification Tool can also display the contents of the
signed object.
OPTIONS
-A
Displays all of the information in the PKCS#7 signature.
-V
Verifies the digital signature.
-d directory
Specify the database directory which contains the certificates and
keys.
signver supports two types of databases: the legacy security
databases (cert8.db, key3.db, and secmod.db) and new SQLite
databases (cert9.db, key4.db, and pkcs11.txt). If the prefix dbm:
is not used, then the tool assumes that the given databases are in
the SQLite format.
-a
Sets that the given signature file is in ASCII format.
-i input_file
Gives the input file for the object with signed data.
-o output_file
Gives the output file to which to write the results.
-s signature_file
Gives the input file for the digital signature.
-v
Enables verbose output.
EXTENDED EXAMPLES
Verifying a Signature
The -V option verifies that the signature in a given signature file is
valid when used to sign the given object (from the input file).
signver -V -s signature_file -i signed_file -d /home/my/sharednssdb
signatureValid=yes
Printing Signature Data
The -A option prints all of the information contained in a signature
file. Using the -o option prints the signature file information to the
given output file rather than stdout.
signver -A -s signature_file -o output_file
NSS DATABASE TYPES
NSS originally used BerkeleyDB databases to store security information.
The last versions of these legacy databases are:
o cert8.db for certificates
o key3.db for keys
o secmod.db for PKCS #11 module information
BerkeleyDB has performance limitations, though, which prevent it from
being easily used by multiple applications simultaneously. NSS has some
flexibility that allows applications to use their own, independent
database engine while keeping a shared database and working around the
access issues. Still, NSS requires more flexibility to provide a truly
shared security database.
In 2009, NSS introduced a new set of databases that are SQLite
databases rather than BerkleyDB. These new databases provide more
accessibility and performance:
o cert9.db for certificates
o key4.db for keys
o pkcs11.txt, which is listing of all of the PKCS #11 modules
contained in a new subdirectory in the security databases directory
Because the SQLite databases are designed to be shared, these are the
shared database type. The shared database type is preferred; the legacy
format is included for backward compatibility.
By default, the tools (certutil, pk12util, modutil) assume that the
given security databases use the SQLite type Using the legacy databases
must be manually specified by using the dbm: prefix with the given
security directory. For example:
# signver -A -s signature -d dbm:/home/my/sharednssdb
To set the legacy database type as the default type for the tools, set
the NSS_DEFAULT_DB_TYPE environment variable to dbm:
export NSS_DEFAULT_DB_TYPE="dbm"
This line can be added to the ~/.bashrc file to make the change
permanent for the user.
o https://wiki.mozilla.org/NSS_Shared_DB_Howto
For an engineering draft on the changes in the shared NSS databases,
see the NSS project wiki:
o https://wiki.mozilla.org/NSS_Shared_DB
SEE ALSO
signtool (1)
The NSS wiki has information on the new database design and how to
configure applications to use it.
o Setting up the shared NSS database
https://wiki.mozilla.org/NSS_Shared_DB_Howto
o Engineering and technical information about the shared NSS database
https://wiki.mozilla.org/NSS_Shared_DB
ADDITIONAL RESOURCES
For information about NSS and other tools related to NSS (like JSS),
check out the NSS project wiki at
http://www.mozilla.org/projects/security/pki/nss/. The NSS site relates
directly to NSS code changes and releases.
Mailing lists: https://lists.mozilla.org/listinfo/dev-tech-crypto
IRC: Freenode at #dogtag-pki
AUTHORS
The NSS tools were written and maintained by developers with Netscape,
Red Hat, Sun, Oracle, Mozilla, and Google.
Authors: Elio Maldonado <emaldona@redhat.com>, Deon Lackey
<dlackey@redhat.com>.
LICENSE
Licensed under the Mozilla Public License, v. 2.0. If a copy of the MPL
was not distributed with this file, You can obtain one at
http://mozilla.org/MPL/2.0/.
NOTES
1. Mozilla NSS bug 836477
https://bugzilla.mozilla.org/show_bug.cgi?id=836477
nss-tools 19 May 2021 signver(1)
nss 3.66 - Generated Sun May 30 13:28:26 CDT 2021