7 .Nd calculate a message-digest fingerprint (checksum) for a file
15 takes as input a message of arbitrary length and produces
21 It is conjectured that it is computationally infeasible to
22 produce two messages having the same message digest, or to produce any
23 message having a given prespecified target message digest.
24 The MD5 algorithm is intended for digital signature applications, where a
27 in a secure manner before being encrypted with a private
29 key under a public-key cryptosystem such as
32 MD5 has not yet (2001-09-03) been broken, but sufficient attacks have been
33 made that its security is in some doubt.
35 are in the nature of finding
37 \(em that is, multiple
38 inputs which hash to the same value; it is still unlikely for an attacker
39 to be able to determine the exact original input given a hash value.
41 The following options may be used in any combination and must
42 precede any files named on the command line.
44 sum of each file listed on the command line is printed after the options
46 .Bl -tag -width indent
48 Print a checksum of the given
51 Echo stdin to stdout and appends the MD5 sum to stdout.
53 Quiet mode - only the MD5 sum is printed out.
58 Reverses the format of the output.
59 This helps with visual diffs.
61 when combined with the
65 Run a built-in time trial.
67 Run a built-in test script.
73 .%T The MD5 Message-Digest Algorithm
77 This program is placed in the public domain for free general use by