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third_party/scrypt/scrypt.1

Index: third_party/scrypt/scrypt.1
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--- third_party/scrypt/scrypt.1	(revision 175254)
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-.\" Copyright 2009 Colin Percival
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.Dd May 24, 2009
-.Dt SCRYPT 1
-.Os
-.Sh NAME
-.Nm scrypt
-.Nd encrypt and decrypt files.
-.Sh SYNOPSIS
-.Nm
-.Brq Cm enc | Cm dec
-.Op Fl M Ar maxmem
-.Op Fl m Ar maxmemfrac
-.Op Fl t Ar maxtime
-.Ar infile
-.Op Ar outfile
-.Sh DESCRIPTION
-.Nm Cm enc
-encrypts
-.Ar infile
-and writes the result to
-.Ar outfile
-if specified, or the standard output otherwise.
-The user will be prompted to enter a passphrase (twice) to
-be used to generate a derived encryption key.
-.Pp
-.Nm Cm dec
-decrypts
-.Ar infile
-and writes the result to
-.Ar outfile
-if specified, or the standard output otherwise.
-The user will be prompted to enter the passphrase used at
-encryption time to generate the derived encryption key.
-.Sh OPTIONS
-.Bl -tag -width "-m maxmemfrac"
-.It Fl M Ar maxmem
-Use at most
-.Ar maxmem
-bytes of RAM to compute the derived encryption key.
-.It Fl m Ar maxmemfrac
-Use at most the fraction
-.Ar maxmemfrac
-of the available RAM to compute the derived encryption key.
-.It Fl t Ar maxtime
-Usr at most
-.Ar maxtime
-seconds of CPU time to compute the derived encryption key.
-.El
-In
-.Nm Cm enc ,
-the memory and CPU time limits are enforced by picking
-appropriate parameters to the
-.Nm
-key derivation function.
-In
-.Nm Cm dec ,
-the memory and CPU time limits are enforced by exiting with
-an error if decrypting the file would require too much memory
-or CPU time.
-.Sh EXIT STATUS
-The
-.Nm
-utility exits 0 on success, and >0 if an error occurs.
-.Pp
-Note that if the input encrypted file is corrupted,
-.Nm Cm dec
-may produce output prior to determining that the input
-was corrupt and exiting with a non-zero status; so
-users should direct the output to a safe location and
-check the exit status of
-.Nm
-before using the decrypted data.
-.Sh SEE ALSO
-.Rs
-.%A "Colin Percival"
-.%T "Stronger Key Derivation via Sequential Memory-Hard Functions"
-.%O "Presented at BSDCan'09"
-.%D "May 2009"
-.Re
-.Sh HISTORY
-The
-.Nm
-utility was written in May 2009 by Colin Percival as a
-demonstration of the
-.Nm
-key derivation function.
-The
-.Nm
-key derivation function was invented in March 2009 by Colin
-Percival in order to allow key files from the
-.Nm tarsnap
-backup system to be passphrase protected.