rax2 - Man Page

This command is part of the radare project.

Rax2 is a powerful calculator within the Radare2 suite, primarily used for numerical system conversions, encoding and decoding C strings, hexpairs, and base64, essential for binary analysis and reverse engineering tasks.

The most common numerical bases include binary (base 2) for direct machine code interaction, hexadecimal (base 16) for memory addresses and compact data representation, and decimal (base 10) for human-readable calculations and interpretations.

-a

Show ASCII table

-b

Force output mode (numeric base)

f floating point
2 binary
3 ternary
8 octal
10 decimal
16 hexadecimal

-c

Show hexadecimal C string from integer value

-C

Dump stdin to C array in stdout (xxd replacement)

-d

Print the result in decimal (base 10)

-D

Decode the input data using base64

-e

Swap endianness

-E

Encode the input data using base64

-f

Interpret the input number as a 32bit dword and display it using IEEE 754 standard for floating point arithmetic

-F

Read C strings from stdin and output in hexpairs. Useful to load shellcodes

-h

Show usage help message

-k

Keep the same base as the input data

-K

Show randomart key asciiart for values or hexpairs

-H

Convert a string into a hash

-i

Convert LONG to/from IP ADDRESS

-j

Show the output in json format, the same as the r2 `?j 0x804` command.

-n

Append newline to the decoded output for human friendlyness

-o

Convert from octal string to char (rax2 -o 162 62)

-q

Be quiet. Show less information or drop the superfluous details in the output. For example: rax2 -qC

-r

Show the same output as the r2's `? 0x804` command. When combined with -S (-rS) it will print r2 commands to write the actual binary into radare2

-s

Convert from hex pairs string to character (rax2 -s 43 4a 50)

-S

Convert from character to hex string (rax2 -S C J P)

-t

Convert epoch timestamp to human readable date format

-u

Convert given value to human readable units format

-v

Show program version

-w

Display the result as 16bit signed integer value

-x

Show hexpairs from integer value

-X

Convert a bit stream (an arbitrary sequence of 0 and 1 of any length) to hexadecimal. The result can be larger than 64bits

-z

Convert from character string to binary (rax2 -z hello)

-Z

Convert from binary string to string (rax2 -l 01000101)

Available variable types are:

int -> hex rax2 10
hex -> int rax2 0xa
-int -> hex rax2 -77
-hex -> int rax2 0xffffffb3
int -> bin rax2 b30
bin -> int rax2 1010d
float -> hex rax2 3.33f
hex -> float rax2 Fx40551ed8
oct -> hex rax2 35o
hex -> oct rax2 Ox12 (O is a letter)
bin -> hex rax2 1100011b
hex -> bin rax2 Bx63

With no arguments, rax2 reads values from stdin. You can pass one or more values as arguments.

$ rax2 33 0x41 0101b
0x21
65
0x5

You can do 'unpack' hexpair encoded strings easily.

$ rax2 -s 41 42 43
ABC

It supports some math operations:

$ rax2 1+1 "0x5*101b+5"
2
30

Encode and decode binary file using base64:

$ rax2 -E < /bin/ls > ls.b64
$ rax2 -D < ls.b64 > ls

$ cmp /bin/ls ls && echo $?
0

Use -z/-Z to convert between binary and string:

$ rax2 -z hello
001100000111100000110001001100010011001000110011
$ rax2 -Z 0110100001100101011011000110110001101111
hello

It is a very useful tool for scripting, so you can read floating point values, or get the integer offset of a jump or a stack delta when analyzing programs.

radare2(1)

https://www.radare.org

Written by pancake <pancake@nopcode.org>.

radare2(1).