Manual Reference Pages - MD5 (1)
md5, sha1, sha256, rmd160
- calculate a message-digest fingerprint (checksum) for a file
md5, sha1, sha256
utilities take as input a message of arbitrary length and produce as
of the input.
It is conjectured that it is computationally infeasible to
produce two messages having the same message digest, or to produce any
message having a given prespecified target message digest.
MD5, SHA-1, SHA-256
algorithms are intended for digital signature applications, where a
large file must be
in a secure manner before being encrypted with a private
key under a public-key cryptosystem such as
has not yet (2001-09-03) been broken, but sufficient attacks have been
made that its security is in some doubt.
The attacks on
are in the nature of finding
that is, multiple
inputs which hash to the same value; it is still unlikely for an attacker
to be able to determine the exact original input given a hash value.
The following options may be used in any combination and must
precede any files named on the command line.
The hexadecimal checksum of each file listed on the command line is printed
after the options are processed.
Print a checksum of the given
Echo stdin to stdout and append the checksum to stdout.
Quiet mode - only the checksum is printed out.
Reverses the format of the output.
This helps with visual diffs.
when combined with the
Run a built-in time trial.
Run a built-in test script.
md5, sha1, sha256
utilities exit 0 on success,
and 1 if at least one of the input files could not be read.
The MD5 Message-Digest Algorithm
The Secure Hash Standard
US Secure Hash Algorithm 1
RIPEMD-160 is part of the ISO draft standard
"ISO/IEC DIS 10118-3"
on dedicated hash functions.
Secure Hash Standard (SHS):
The RIPEMD-160 page:
This program is placed in the public domain for free general use by
RSA Data Security.
Support for SHA-1 and RIPEMD-160 has been added by
.An Oliver Eikemeier Aq eik@FreeBSD.org .
Visit the GSP FreeBSD Man Page Interface.
Output converted with manServer 1.07.