This patch imports the unmodified current version of NetBSD libc. The NetBSD includes are in /nbsd_include, while the libc code itself is split between lib/nbsd_libc and common/lib/libc.
123 lines
3.2 KiB
Groff
123 lines
3.2 KiB
Groff
.\" $NetBSD: md2.3,v 1.1 2005/09/24 20:51:14 elad Exp $
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.\"
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.\" ----------------------------------------------------------------------------
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.\" "THE BEER-WARE LICENSE" (Revision 42):
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.\" <phk@login.dkuug.dk> wrote this file. As long as you retain this notice you
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.\" can do whatever you want with this stuff. If we meet some day, and you think
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.\" this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
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.\" ----------------------------------------------------------------------------
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.\"
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.\" from FreeBSD Id: mdX.3,v 1.7 1996/10/22 16:28:56 phk Exp
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.\"
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.Dd September 24, 2005
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.Dt MD2 3
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.Os
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.Sh NAME
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.Nm MD2Init ,
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.Nm MD2Update ,
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.Nm MD2Final ,
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.Nm MD2End ,
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.Nm MD2File ,
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.Nm MD2Data
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.Nd calculate the RSA Data Security, Inc.,
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.Dq MD2
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message digest
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In sys/types.h
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.In mdX.h
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.Ft void
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.Fn MD2Init "MD2_CTX *context"
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.Ft void
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.Fn MD2Update "MD2_CTX *context" "const unsigned char *data" "unsigned int len"
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.Ft void
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.Fn MD2Final "unsigned char digest[16]" "MD2_CTX *context"
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.Ft "char *"
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.Fn MD2End "MD2_CTX *context" "char *buf"
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.Ft "char *"
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.Fn MD2File "const char *filename" "char *buf"
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.Ft "char *"
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.Fn MD2Data "const unsigned char *data" "unsigned int len" "char *buf"
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.Sh DESCRIPTION
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The MD2 functions calculate a 128-bit cryptographic checksum (digest)
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for any number of input bytes.
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A cryptographic checksum is a one-way
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hash-function, that is, you cannot find (except by exhaustive search)
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the input corresponding to a particular output.
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This net result is
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a ``fingerprint'' of the input-data, which doesn't disclose the actual
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input.
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.Pp
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The MD2 routines should not be used for any security-related purpose.
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.Pp
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The
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.Fn MD2Init ,
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.Fn MD2Update ,
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and
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.Fn MD2Final
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functions are the core functions.
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Allocate an MD2_CTX, initialize it with
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.Fn MD2Init ,
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run over the data with
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.Fn MD2Update ,
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and finally extract the result using
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.Fn MD2Final .
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.Pp
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.Fn MD2End
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is a wrapper for
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.Fn MD2Final
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which converts the return value to a 33-character
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(including the terminating '\e0')
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.Tn ASCII
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string which represents the 128 bits in hexadecimal.
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.Pp
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.Fn MD2File
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calculates the digest of a file, and uses
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.Fn MD2End
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to return the result.
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If the file cannot be opened, a null pointer is returned.
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.Fn MD2Data
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calculates the digest of a chunk of data in memory, and uses
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.Fn MD2End
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to return the result.
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.Pp
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When using
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.Fn MD2End ,
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.Fn MD2File ,
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or
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.Fn MD2Data ,
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the
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.Ar buf
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argument can be a null pointer, in which case the returned string
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is allocated with
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.Xr malloc 3
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and subsequently must be explicitly deallocated using
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.Xr free 3
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after use.
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If the
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.Ar buf
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argument is non-null it must point to at least 33 characters of buffer space.
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.Sh SEE ALSO
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.Xr md2 3 ,
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.Rs
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.%A B. Kaliski
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.%T The MD2 Message-Digest Algorithm
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.%O RFC 1319
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.Re
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.Rs
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.%A RSA Laboratories
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.%T Frequently Asked Questions About today's Cryptography
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.Re
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.Sh HISTORY
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These functions appeared in
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.Nx 1.3 .
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.Sh AUTHORS
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The original MD2 routines were developed by
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.Tn RSA
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Data Security, Inc., and published in the above references.
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This code is a public domain implementation by Andrew Brown.
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.Sh BUGS
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No method is known to exist which finds two files having the same hash value,
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nor to find a file with a specific hash value.
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There is on the other hand no guarantee that such a method doesn't exist.
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