1.\" $NetBSD: netpgpverify.1,v 1.8 2014/03/09 00:15:45 agc Exp $ 2.\" 3.\" Copyright (c) 2013,2014 Alistair Crooks <agc@NetBSD.org> 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25.\" 26.Dd February 2, 2014 27.Dt NETPGPVERIFY 1 28.Os 29.Sh NAME 30.Nm netpgpverify 31.Nd standalone program for digital signature verification 32.Sh SYNOPSIS 33.Nm 34.Op Fl v 35.Op Fl S Ar ssh-pub-key-file 36.Op Fl c Ar command 37.Op Fl k Ar keyring 38.Ar file ... 39.Sh DESCRIPTION 40The 41.Nm 42implements digital signature verification. 43It is designed to be simple and standalone; no external libraries, except 44for 45.Xr libz 46and 47.Xr libbz2 48are used, in order to ensure maximum portability. 49.Pp 50It is completely rewritten from the version of the program that appeared in 51.Nx 6.0 52as part of the 53.Xr netpgp 1 54suite of commands. 55.Pp 56The 57.Nm 58utility requires a file containing public keys, commonly called a 59.Dq keyring . 60Digitally-signed information can be fed to 61.Nm 62in two ways: as standard input, or as files provided on the command line. 63The public key part of the key which was used to sign the file must be 64present, or the signature verification will fail. 65Files may be signed in two distinct ways: as text documents, and as binary 66files. 67Text documents modify the contents to add different line-ending 68characters, and behave differently at the final byte of the input document. 69Binary files are read verbatim, and are not modified in any way. 70.Pp 71The 72.Fl k 73command line argument allows a keyring to be specified. 74The 75.Fl v 76command line argument prints the version of the 77.Nm 78command and then exits. 79Finally, the 80.Fl c 81command specified the command which may be given. 82This can take one of two values: 83.Dq verify 84which is also the default, which verifies the signature 85on the data; 86.Dq cat 87will also verify the signature on the data, and, if 88successfully verified, will display the verified 89data on 90.Dv stdout . 91The 92.Fl S 93argument allows an ssh public key file to be used as the source of 94truth for the key. 95This ssh-key-based signature can be created using the 96.Xr netpgp 1 97utility. 98.Pp 99If a detached signature 100.Dq .sig 101is given on the command line, the signing information will be retrieved 102from that file, and the original data is expected to be found in a file in the same 103directory with the same name with the 104.Dq .sig 105suffix removed. 106.Pp 107Both text mode signatures, and binary signatures, can be verified by 108.Nm 109.Sh SIGNING AND VERIFICATION 110Verification of a file's signature is best viewed using the following example: 111.Bd -literal 112% netpgpverify -k pubring.gpg NetBSD-6.0_RC1_hashes.asc 113Good signature for NetBSD-6.0_RC1_hashes.asc made Thu Aug 23 11:47:50 2012 114signature 4096/RSA (Encrypt or Sign) 064973ac4c4a706e 2009-06-23 115fingerprint ddee 2bdb 9c98 a0d1 d4fb dbf7 0649 73ac 4c4a 706e 116uid NetBSD Security Officer <security-officer@NetBSD.org> 117% 118.Ed 119.Sh EXIT STATUS 120The 121.Nm 122utility will return 0 for a successful verification, 1231 if the file's signature does not match what was expected, 124or 2 if any other error occurs. 125.Sh SEE ALSO 126.Xr netpgp 1 , 127.\" .Xr libbz2 3 , 128.Xr zlib 3 129.Sh STANDARDS 130The 131.Nm 132utility is designed to conform to IETF RFC 4880. 133.Sh HISTORY 134The 135.Nm 136command first appeared in 137.Nx 7.0 . 138.Sh AUTHORS 139.An Alistair Crooks Aq agc@NetBSD.org . 140