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
204 lines
5 KiB
Groff
204 lines
5 KiB
Groff
.\" $NetBSD: sha1.3,v 1.6 2010/04/05 21:27:01 joerg Exp $
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.\" $OpenBSD: sha1.3,v 1.9 1998/03/07 22:18:12 millert Exp $
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.\"
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.\" Copyright (c) 1997, 2004 Todd C. Miller <Todd.Miller@courtesan.com>
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.\"
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.\" Permission to use, copy, modify, and distribute this software for any
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.\" purpose with or without fee is hereby granted, provided that the above
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.\" copyright notice and this permission notice appear in all copies.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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.\"
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.\" See http://csrc.nist.gov/fips/fip180-1.txt for the detailed standard
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.\"
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.Dd July 10, 1997
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.Dt SHA1 3
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.Os
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.Sh NAME
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.Nm SHA1Init ,
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.Nm SHA1Update ,
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.Nm SHA1Final ,
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.Nm SHA1Transform ,
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.Nm SHA1End ,
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.Nm SHA1File ,
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.Nm SHA1Data
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.Nd calculate the NIST Secure Hash Algorithm
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.Sh SYNOPSIS
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.In sys/types.h
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.In sha1.h
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.Ft void
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.Fn SHA1Init "SHA1_CTX *context"
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.Ft void
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.Fn SHA1Update "SHA1_CTX *context" "const uint8_t *data" "u_int len"
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.Ft void
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.Fn SHA1Final "uint8_t digest[20]" "SHA1_CTX *context"
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.Ft void
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.Fn SHA1Transform "uint32_t state[5]" "uint8_t buffer[64]"
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.Ft "char *"
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.Fn SHA1End "SHA1_CTX *context" "char *buf"
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.Ft "char *"
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.Fn SHA1File "char *filename" "char *buf"
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.Ft "char *"
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.Fn SHA1Data "uint8_t *data" "size_t len" "char *buf"
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.Sh DESCRIPTION
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The SHA1 functions implement the NIST Secure Hash Algorithm (SHA-1),
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FIPS PUB 180-1.
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SHA-1 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 SHA1 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 with which they share a similar interface.
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.Pp
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The
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.Fn SHA1Init
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function initializes a SHA1_CTX
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.Ar context
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for use with
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.Fn SHA1Update ,
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and
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.Fn SHA1Final .
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The
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.Fn SHA1Update
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function adds
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.Ar data
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of length
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.Ar len
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to the SHA1_CTX specified by
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.Ar context .
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.Fn SHA1Final
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is called when all data has been added via
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.Fn SHA1Update
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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 SHA1Final
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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 SHA1Update .
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.Pp
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The
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.Fn SHA1Transform
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function is used by
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.Fn SHA1Update
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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 SHA1Init ,
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.Fn SHA1Update
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and
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.Fn SHA1Final
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instead of calling
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.Fn SHA1Transform
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directly.
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.Pp
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The
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.Fn SHA1End
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function is a front end for
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.Fn SHA1Final
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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 SHA1File
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function calculates the digest for a file and returns the result via
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.Fn SHA1End .
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If
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.Fn SHA1File
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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 SHA1Data
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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 SHA1End .
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.Pp
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For each of the
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.Fn SHA1End ,
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.Fn SHA1File ,
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and
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.Fn SHA1Data
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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
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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 ``0xa9993e36476816aba3e25717850c26c9cd0d89d''.
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.Bd -literal -offset indent
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SHA1_CTX sha;
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uint8_t 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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SHA1Init(\*[Am]sha);
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SHA1Update(\*[Am]sha, (uint8_t *)buf, n);
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SHA1Final(results, \*[Am]sha);
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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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SHA1_CTX sha;
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uint8_t output[41];
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char *buf = "abc";
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printf("0x%s", SHA1Data(buf, strlen(buf), output));
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.Ed
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.Sh SEE ALSO
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.\" .Xr sha1 1 ,
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.Xr md5 1 ,
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.Xr md4 3 ,
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.Xr md5 3
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.Pp
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.Rs
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.%A J. Burrows
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.%T The Secure Hash Standard
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.%O FIPS PUB 180-1
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.Re
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.Sh HISTORY
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The SHA-1 functions appeared in
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.Nx 1.4 .
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.Sh AUTHORS
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This implementation of SHA-1 was written by Steve Reid.
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.Pp
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The
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.Fn SHA1End ,
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.Fn SHA1File ,
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and
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.Fn SHA1Data
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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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This implementation of SHA-1 has not been validated by NIST
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and as such is not in official compliance with the standard.
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.Pp
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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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