2fe8fb192f
There is important information about booting non-ack images in docs/UPDATING. ack/aout-format images can't be built any more, and booting clang/ELF-format ones is a little different. Updating to the new boot monitor is recommended. Changes in this commit: . drop boot monitor -> allowing dropping ack support . facility to copy ELF boot files to /boot so that old boot monitor can still boot fairly easily, see UPDATING . no more ack-format libraries -> single-case libraries . some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases . drop several ack toolchain commands, but not all support commands (e.g. aal is gone but acksize is not yet). . a few libc files moved to netbsd libc dir . new /bin/date as minix date used code in libc/ . test compile fix . harmonize includes . /usr/lib is no longer special: without ack, /usr/lib plays no kind of special bootstrapping role any more and bootstrapping is done exclusively through packages, so releases depend even less on the state of the machine making them now. . rename nbsd_lib* to lib* . reduce mtree
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6.1 KiB
Groff
225 lines
6.1 KiB
Groff
.\" $NetBSD: rmd160.3,v 1.3 2010/04/05 21:26:30 joerg Exp $
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.\" $OpenBSD: rmd160.3,v 1.12 2000/04/18 03:01:29 aaron Exp $
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.\"
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.\" Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
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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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.\" 3. The name of the author may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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.\" INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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.\" AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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.\" THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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.\" EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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.\" PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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.\" OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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.\" OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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.\" ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" See http://www.esat.kuleuven.ac.be/~bosselae/ripemd160.html
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.\" for detailed information about RIPEMD-160.
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.\"
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.Dd July 16, 1997
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.Dt RMD160 3
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.Os
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.Sh NAME
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.Nm RMD160Init ,
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.Nm RMD160Update ,
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.Nm RMD160Final ,
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.Nm RMD160Transform ,
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.Nm RMD160End ,
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.Nm RMD160File ,
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.Nm RMD160Data
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.Nd calculate the ``RIPEMD-160'' message digest
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.Sh SYNOPSIS
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.In sys/types.h
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.In rmd160.h
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.Ft void
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.Fn RMD160Init "RMD160_CTX *context"
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.Ft void
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.Fn RMD160Update "RMD160_CTX *context" "const u_char *data" "u_int nbytes"
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.Ft void
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.Fn RMD160Final "u_char digest[20]" "RMD160_CTX *context"
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.Ft void
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.Fn RMD160Transform "uint32_t state[5]" "const uint32_t block[16]"
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.Ft "char *"
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.Fn RMD160End "RMD160_CTX *context" "char *buf"
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.Ft "char *"
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.Fn RMD160File "char *filename" "char *buf"
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.Ft "char *"
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.Fn RMD160Data "u_char *data" "size_t len" "char *buf"
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.Sh DESCRIPTION
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The RMD160 functions implement the 160-bit RIPE message digest hash algorithm
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(RMD-160).
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RMD-160 is used to generate a condensed representation
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of a message called a message digest.
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The algorithm takes a
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message less than 2^64 bits as input and produces a 160-bit digest
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suitable for use as a digital signature.
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.Pp
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The RMD160 functions are considered to be more secure than the
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.Xr md4 3
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and
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.Xr md5 3
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functions and at least as secure as the
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.Xr sha1 3
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function.
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All share a similar interface.
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.Pp
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The
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.Fn RMD160Init
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function initializes a RMD160_CTX
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.Ar context
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for use with
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.Fn RMD160Update ,
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and
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.Fn RMD160Final .
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The
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.Fn RMD160Update
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function adds
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.Ar data
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of length
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.Ar nbytes
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to the RMD160_CTX specified by
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.Ar context .
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.Fn RMD160Final
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is called when all data has been added via
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.Fn RMD160Update
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and stores a message digest in the
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.Ar digest
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parameter.
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When a null pointer is passed to
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.Fn RMD160Final
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as first argument only the final padding will be applied and the
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current context can still be used with
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.Fn RMD160Update .
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.Pp
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The
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.Fn RMD160Transform
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function is used by
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.Fn RMD160Update
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to hash 512-bit blocks and forms the core of the algorithm.
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Most programs should use the interface provided by
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.Fn RMD160Init ,
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.Fn RMD160Update
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and
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.Fn RMD160Final
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instead of calling
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.Fn RMD160Transform
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directly.
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.Pp
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The
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.Fn RMD160End
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function is a front end for
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.Fn RMD160Final
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which converts the digest into an
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.Tn ASCII
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representation of the 160 bit digest in hexadecimal.
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.Pp
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The
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.Fn RMD160File
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function calculates the digest for a file and returns the result via
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.Fn RMD160End .
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If
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.Fn RMD160File
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is unable to open the file a NULL pointer is returned.
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.Pp
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The
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.Fn RMD160Data
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function
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calculates the digest of an arbitrary string and returns the result via
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.Fn RMD160End .
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.Pp
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For each of the
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.Fn RMD160End ,
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.Fn RMD160File ,
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and
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.Fn RMD160Data
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functions the
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.Ar buf
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parameter should either be a string of at least 41 characters in
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size or a NULL pointer.
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In the latter case, space will be dynamically allocated via
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.Xr malloc 3
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and should be freed using
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.Xr free 3
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when it is no longer needed.
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.Sh EXAMPLES
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The follow code fragment will calculate the digest for
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the string "abc" which is ``0x8eb208f7e05d987a9b044a8e98c6b087f15a0bfc''.
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.Bd -literal -offset indent
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RMD160_CTX rmd;
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u_char results[20];
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char *buf;
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int n;
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buf = "abc";
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n = strlen(buf);
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RMD160Init(\*[Am]rmd);
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RMD160Update(\*[Am]rmd, (u_char *)buf, n);
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RMD160Final(results, \*[Am]rmd);
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/* Print the digest as one long hex value */
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printf("0x");
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for (n = 0; n \*[Lt] 20; n++)
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printf("%02x", results[n]);
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putchar('\en');
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.Ed
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.Pp
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Alternately, the helper functions could be used in the following way:
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.Bd -literal -offset indent
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RMD160_CTX rmd;
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u_char output[41];
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char *buf = "abc";
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printf("0x%s\en", RMD160Data(buf, strlen(buf), output));
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.Ed
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.Sh SEE ALSO
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.Xr rmd160 1 ,
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.Xr md4 3 ,
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.Xr md5 3 ,
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.Xr sha1 3
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.Pp
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.Rs
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.%A H. Dobbertin, A. Bosselaers, B. Preneel
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.%T RIPEMD-160, a strengthened version of RIPEMD
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.Re
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.Rs
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.%T Information technology - Security techniques - Hash-functions - Part 3: Dedicated hash-functions
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.%O ISO/IEC 10118-3
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.Re
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.Rs
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.%A H. Dobbertin, A. Bosselaers, B. Preneel
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.%T The RIPEMD-160 cryptographic hash function
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.%J Dr. Dobb's Journal
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.%V Vol. 22, No. 1
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.%D January 1997
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.%P pp. 24-28
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.Re
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.Sh HISTORY
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The RMD-160 functions appeared in
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.Ox 2.1 .
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.Sh AUTHORS
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This implementation of RMD-160 was written by Antoon Bosselaers.
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.Pp
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The
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.Fn RMD160End ,
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.Fn RMD160File ,
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and
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.Fn RMD160Data
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helper functions are derived from code written by Poul-Henning Kamp.
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.Sh BUGS
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If a message digest is to be copied to a multi-byte type (ie:
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an array of five 32-bit integers) it will be necessary to
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perform byte swapping on little endian machines such as the i386, alpha,
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and VAX.
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