RAHASH2(1) BSD General Commands Manual RAHASH2(1)NAMErahash2 — block based hashing utility
SYNOPSISrahash2 [-BdDehjrkvq] [-a algorithm] [-b size] [-D algo] [-E algo]
[-s string] [-i iterations] [-I IV] [-S seed] [-f from]
[-x hexstr] [-t to] [-c hash] [[file] ...]
DESCRIPTION
This program is part of the radare project.
Rahash2 allows you to calculate, check and show the hash values of each
block of a target file. The block size is 32768 bytes by default. It's
allowed to hash from stdin using '-' as a target file. You can compare
against a known hash and get the result in the exit status.
You can hash big files by hashing each block and later determine what
part of it has been modified. Useful for filesystem analysis.
This command can be used to calculate hashes of a certain part of a file
or a command line passed string.
This is the command used by the 'ph' command of radare.
-a algo Select an algorithm for the hashing. Valid values are listed
in: rahash2-L
-b blocksize
Define the block size
-c hash Compare the computed hash with this one. Allowed only when a
single hash is computed.
-D algo Decrypt instead of hash using the given algorithm (base64,
base91, rc4, aes, xor, blowfish, rot, rol, ror, rc2, rc6,
punycode)
-e Use little endian to display checksums
-E algo Encrypt instead of hash using the given algorithm (base64,
base91, rc4, aes, xor, blowfish, rot, rol, ror, rc2, rc6,
punycode)
-i iters Apply the hash Iters times to itself+seed
-I [^]s:string|hexstr
Set initialization vector (IV) for the cryptographic func‐
tions.
-j Show output in JSON (see -r)
-B Show per-block hash
-k Show result using OpenSSH's VisualHostKey randomart algorithm
-s string Hash this string instead of using the 'source' and 'hash-
file' arguments.
-S [^]s:string|hexstr
Set seed to hash with, use ^to prefix seed, otherwise its
suffixed. If the seed is just a dash '-' it will read from
stdin, this is useful to provide huge XOR payloads or other
crypto keys bigger than few bytes.
-f from Start hashing at given address
-t to Stop hashing at given address
-q Quiet mode (-qq for even quieter!)
-r Show output in radare commands
-x hexstr Hash the given hexpair string instead of using the 'source'
and 'hash-file' arguments.
-v Show version information
-h Show usage help message.
DIAGNOSTICS
The rahash2 utility exits 0 on success, and >0 if an error occurs.
When -c is used, exit status 0 indicates a match between the expected and
computed hashes.
SEE ALSOradare2(1), rafind2(1), rahash2(1), rabin2(1), radiff2(1), rasm2(1),
ragg2(1), rarun2(1), rax2(1),
AUTHORS
pancake <pancake@nopcode.org>
Feb 6, 2015
