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Assorted updates to md5.1

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Note that the -c argument's parameter is compared against the digest of
the file, not the file. [1]

Update the "current time" parentheticals for notes about reversing
and colliding the hash functions. [1]

Some general mdoc updates.

PR:		docs/188043 [1]
Submitted by:	Jamie Landeg-Jones [1]
Approved by:	hrs (mentor)
MFC after:	1 week
This commit is contained in:
Benjamin Kaduk 2014-05-18 21:16:59 +00:00
parent 59be36b0f7
commit 0e2e260ed2
1 changed files with 9 additions and 7 deletions
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16
sbin/md5/md5.1
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@ -1,5 +1,5 @@
.\" $FreeBSD$ .\" $FreeBSD$
.Dd July 31, 2012 .Dd May 17, 2014
.Dt MD5 1 .Dt MD5 1
.Os .Os
.Sh NAME .Sh NAME
@ -63,12 +63,12 @@ concerned, and should not be relied upon to produce unique outputs.
This also means that This also means that
.Tn MD5 .Tn MD5
should not be used as part of a cryptographic signature scheme. should not be used as part of a cryptographic signature scheme.
At the current time (2009-01-06) there is no publicly known method to At the current time (2014-05-17) there is no publicly known method to
.Dq reverse .Dq reverse
MD5, i.e., to find an input given a hash value. MD5, i.e., to find an input given a hash value.
.Pp .Pp
.Tn SHA-1 .Tn SHA-1
currently (2009-01-06) has no known collisions, but an attack has been currently (2014-05-17) has no known collisions, but an attack has been
found which is faster than a brute-force search, placing the security of found which is faster than a brute-force search, placing the security of
.Tn SHA-1 .Tn SHA-1
in doubt. in doubt.
@ -83,15 +83,15 @@ The hexadecimal checksum of each file listed on the command line is printed
after the options are processed. after the options are processed.
.Bl -tag -width indent .Bl -tag -width indent
.It Fl c Ar string .It Fl c Ar string
Compare files to this md5 string. Compare the digest of the file against this string.
(Note that this option is not yet useful if multiple files are specified.) .Pq Note that this option is not yet useful if multiple files are specified.
.It Fl s Ar string .It Fl s Ar string
Print a checksum of the given Print a checksum of the given
.Ar string . .Ar string .
.It Fl p .It Fl p
Echo stdin to stdout and append the checksum to stdout. Echo stdin to stdout and append the checksum to stdout.
.It Fl q .It Fl q
Quiet mode - only the checksum is printed out. Quiet mode \(em only the checksum is printed out.
Overrides the Overrides the
.Fl r .Fl r
option. option.
@ -114,7 +114,9 @@ and
.Nm rmd160 .Nm rmd160
utilities exit 0 on success, utilities exit 0 on success,
1 if at least one of the input files could not be read, 1 if at least one of the input files could not be read,
and 2 if at least one file does not have the same hash as the -c option. and 2 if at least one file does not have the same hash as the
.Fl c
option.
.Sh SEE ALSO .Sh SEE ALSO
.Xr cksum 1 , .Xr cksum 1 ,
.Xr md5 3 , .Xr md5 3 ,