322 lines
6.9 KiB
Groff
322 lines
6.9 KiB
Groff
.\"
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.\" Copyright (c) 2001 Dima Dorfman.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" This manual page is based on the mp(3X) manual page from Sun Release
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.\" 4.1, dated 7 September 1989. It's an old, crufty, and relatively ugly
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.\" manual page, but it does document what appears to be the "traditional"
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.\" libmp interface.
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.\"
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.\" $FreeBSD$
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.\"
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.\" See above for rationale for this date.
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.Dd September 7, 1989
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.Dt LIBMP 3
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.Os
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.Sh NAME
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.Nm libmp
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.Nd traditional BSD multiple precision integer arithmetic library
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.Sh SYNOPSIS
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.In mp.h
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.Pp
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Function prototypes are given in the main body of the text.
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.Pp
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Applications using this interface must be linked with
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.Fl l Ns Ar mp
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(this library)
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and
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.Fl l Ns Ar crypto
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.Pq Xr crypto 3 .
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.Sh DESCRIPTION
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.Bf -symbolic
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This interface is obsolete in favor of the
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.Xr crypto 3
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.Vt BIGNUM
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library.
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.Ef
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.Pp
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.Nm
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is the traditional
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.Bx
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multiple precision integer arithmetic library.
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It has a number of problems,
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and is unsuitable for use in any programs where reliability is a concern.
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It is provided here for compatibility only.
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.Pp
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These routines perform arithmetic on integers of arbitrary precision
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stored using the defined type
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.Vt MINT .
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Pointers to
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.Vt MINT
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are initialized using
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.Fn itom
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or
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.Fn xtom ,
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and must be recycled with
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.Fn mfree
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when they are no longer needed.
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Routines which store a result in one of their arguments expect that
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the latter has also been initialized prior to being passed to it.
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The following routines are defined and implemented:
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.Pp
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.Ft "MINT *" Ns
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.Fn itom "short n" ;
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.Pp
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.Ft "MINT *" Ns
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.Fn xtom "const char *s" ;
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.Pp
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.Ft "char *" Ns
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.Fn mtox "const MINT *mp" ;
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.Pp
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.Ft void
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.Fn mfree "MINT *mp" ;
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.Bd -ragged -offset indent
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.Fn itom
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returns an
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.Vt MINT
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with the value of
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.Fa n .
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.Fn xtom
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returns an
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.Vt MINT
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with the value of
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.Fa s ,
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which is treated to be in hexadecimal.
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The return values from
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.Fn itom
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and
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.Fn xtom
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must be released with
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.Fn mfree
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when they are no longer needed.
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.Fn mtox
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returns a null-terminated hexadecimal string having the value of
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.Fa mp ;
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its return value must be released with
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.Fn free
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.Pq Xr free 3
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when it is no longer needed.
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.Ed
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.Pp
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.Ft void
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.Fn madd "const MINT *mp1" "const MINT *mp2" "MINT *rmp" ;
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.Pp
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.Ft void
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.Fn msub "const MINT *mp1" "const MINT *mp2" "MINT *rmp" ;
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.Pp
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.Ft void
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.Fn mult "const MINT *mp1" "const MINT *mp2" "MINT *rmp" ;
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.Bd -ragged -offset indent
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.Fn madd ,
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.Fn msub ,
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and
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.Fn mult
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store the sum, difference, or product, respectively, of
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.Fa mp1
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and
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.Fa mp2
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in
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.Fa rmp .
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.Ed
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.Pp
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.Ft void
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.Fn mdiv "const MINT *nmp" "const MINT *dmp" "MINT *qmp" "MINT *rmp" ;
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.Pp
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.Ft void
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.Fn sdiv "const MINT *nmp" "short d" "MINT *qmp" "short *ro" ;
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.Bd -ragged -offset indent
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.Fn mdiv
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computes the quotient and remainder of
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.Fa nmp
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and
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.Fa dmp
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and stores the result in
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.Fa qmp
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and
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.Fa rmp ,
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respectively.
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.Fn sdiv
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is similar to
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.Fn mdiv
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except the divisor
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.Fa ( dmp
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or
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.Fa d )
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and remainder
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.Fa ( rmp
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or
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.Fa ro )
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are ordinary integers.
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.Ed
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.Pp
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.Ft void
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.Fn pow "const MINT *bmp" "const MINT *emp" "const MINT *mmp" "MINT *rmp" ;
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.Pp
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.Ft void
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.Fn pow "const MINT *bmp" "short e" "MINT *rmp" ;
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.Bd -ragged -offset indent
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.Fn rpow
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computes the result of
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.Fa bmp
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raised to the
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.Fa emp Ns th
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power and reduced modulo
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.Fa mmp ;
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the result is stored in
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.Fa rmp .
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.Fn pow
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computes the result of
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.Fa bmp
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raised to the
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.Fa e Ns th
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power and stores the result in
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.Fa rmp .
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.Ed
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.Pp
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.Ft void
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.Fn min "MINT *mp" ;
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.Pp
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.Ft void
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.Fn mout "const MINT *mp" ;
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.Bd -ragged -offset indent
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.Fn min
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reads a line from standard input, tries to interpret it as a decimal
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number, and if successful, stores the result in
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.Fa mp .
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.Fn mout
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prints the value, in decimal, of
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.Fa mp
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to standard output (without a trailing newline).
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.Ed
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.Pp
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.Ft void
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.Fn gcd "const MINT *mp1" "const MINT *mp2" "MINT *rmp" ;
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.Bd -ragged -offset indent
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.Fn gcd
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computes the greatest common divisor of
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.Fa mp1
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and
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.Fa mp2
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and stores the result in
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.Fa rmp .
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.Ed
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.Pp
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.Ft int
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.Fn mcmp "const MINT *mp1" "const MINT *mp2" ;
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.Bd -ragged -offset indent
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.Fa mcmp
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compares the values of
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.Fa mp1
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and
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.Fa mp2
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and returns
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0 if the two values are equal,
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a value greater than 0 if
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.Fa mp1
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is greater than
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.Fa mp2 ,
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and a value less than 0 if
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.Fa mp2
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is greater than
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.Fa mp1 .
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.Ed
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.Pp
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.Ft void
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.Fn move "const MINT *smp" "MINT *tmp" ;
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.Bd -ragged -offset indent
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.Fn move
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copies the value of
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.Fa smp
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to
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.Fa tmp
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(both values must be initialized).
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.Ed
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.Pp
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.Ft void
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.Fn msqrt "const MINT *nmp" "MINT *xmp" "MINT *rmp" ;
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.Bd -ragged -offset indent
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.Fn msqrt
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computes the square root and remainder of
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.Fa nmp
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and stores them in
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.Fa xmp
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and
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.Fa rmp ,
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respectively.
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.Ed
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.Sh IMPLEMENTATION NOTES
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This version of
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.Nm
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is implemented in terms of the
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.Xr crypto 3
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.Vt BIGNUM
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library.
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.Sh DIAGNOSTICS
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Running out of memory or illegal operations result in error messages
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on standard error and a call to
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.Xr abort 3 .
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.Sh SEE ALSO
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.Xr abort 3 ,
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.Xr crypto 3 ,
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.Xr free 3 ,
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.Xr malloc 3 ,
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.Xr math 3
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.Sh HISTORY
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A
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.Nm
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library appeared in
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.Bx 4.3 .
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.Fx 2.2
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shipped with a
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.Nm
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implemented in terms of
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.Nm libgmp .
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This implementation appeared in
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.Fx 5.0 .
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.Sh BUGS
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The
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.Fn pow
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routine exists in both
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.Nm libmp
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and
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.Nm libm
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with incompatible semantics.
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.Pp
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Errors are reported via output to standard error and abnormal
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program termination instead of via return values.
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The application cannot control this behavior.
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.Pp
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It is not clear whether the string returned by
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.Fn mtox
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may be written to by the caller.
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This implementation allows it, but others may not.
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Ideally,
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.Fn mtox
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would take a pointer to a buffer to fill in.
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.Pp
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It is not clear whether using the same variable as both source and
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destination in a single invocation is permitted.
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Some of the calls in this implementation allow this, while others
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do not.
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