1RAHASH2(1)                BSD General Commands Manual               RAHASH2(1)
2

NAME

4     rahash2 — block based hashing utility
5

SYNOPSIS

7     rahash2 [-BbdDehjrknvq] [-a algorithm] [-b size] [-D algo] [-E algo]
8             [-f from] [-i iterations] [-I IV] [-n blocks] [-s string]
9             [-S seed] [-p type] [-x hexstr] [-t to] [-c hash] [[file] ...]
10

DESCRIPTION

12     This program is part of the radare project.
13
14     Rahash2 allows you to calculate, check and show the hash values of each
15     block of a target file. The block size is 32768 bytes by default. It's
16     allowed to hash from stdin using '-' as a target file. You can compare
17     against a known hash and get the result in the exit status.
18
19     You can hash big files by hashing each block and later determine what
20     part of it has been modified. Useful for filesystem analysis.
21
22     This command can be used to calculate hashes of a certain part of a file
23     or a command line passed string.
24
25     This is the command used by the 'ph' command of radare.
26
27     -a algo     Select an algorithm for the hashing. Valid values are listed
28                 in: rahash2 -L
29
30     -b blocksize
31                 Define the block size
32
33     -c hash     Compare the computed hash with this one. Allowed only when a
34                 single hash is computed.
35
36     -D algo     Decrypt instead of hash using the given algorithm (base64,
37                 base91, rc4, aes, xor, blowfish, rot, rol, ror, rc2, rc6,
38                 punycode)
39
40     -e          Use little endian to display checksums
41
42     -E algo     Encrypt instead of hash using the given algorithm (base64,
43                 base91, rc4, aes, xor, blowfish, rot, rol, ror, rc2, rc6,
44                 punycode)
45
46     -i iters    Apply the hash Iters times to itself+seed
47
48     -I [^]s:string|hexstr
49                 Set initialization vector (IV) for the cryptographic func‐
50                 tions.
51
52     -j          Show output in JSON (see -r)
53
54     -B          Show per-block hash
55
56     -k          Show result using OpenSSH's VisualHostKey randomart algorithm
57
58     -n          Amount of blocks to hash
59
60     -s string   Hash this string instead of using the 'source' and 'hash-
61                 file' arguments.
62
63     -S [^]s:string|hexstr
64                 Set seed to hash with, use ^to prefix seed, otherwise its
65                 suffixed. If the seed is just a dash '-' it will read from
66                 stdin, this is useful to provide huge XOR payloads or other
67                 crypto keys bigger than few bytes.
68
69     -f from     Start hashing at given address
70
71     -t to       Stop hashing at given address
72
73     -p arg      Show vertical entropy/statistical entropy graphs
74
75     -q          Quiet mode (-qq for even quieter!)
76
77     -r          Show output in radare commands
78
79     -x hexstr   Hash the given hexpair string instead of using the 'source'
80                 and 'hash-file' arguments.
81
82     -v          Show version information
83
84     -h          Show usage help message.
85

DIAGNOSTICS

87     The rahash2 utility exits 0 on success, and >0 if an error occurs.
88
89     When -c is used, exit status 0 indicates a match between the expected and
90     computed hashes.
91

SEE ALSO

93     radare2(1)
94

AUTHORS

96     pancake <pancake@nopcode.org>
97
98                                  Feb 6, 2015