Crypto Blocks is a simple package that consists of various fundamental functions for building cryptogaphic algorithms.

To Install

Just use pip install cryptoblocks64 to install.

It provides:

• Various general functions required for creating your own Cryptographic algorithm.
• Functions are Classified into classes for ease of use.
• instead of operating on a single bit this edition works in B64 style (instead of {0 or 1} its {0,....,63} values per element)
• Provides easy encoding conversion,S&P Box generation,and many more functions

The Structure:

There are total 4 main classes which are:

• Convert
• Padding
• Process
• Generate

Convert:

consists of various datatype and encoding conversion functions

function	description	code example
string_to_b64	converts input string to URL-Safe Base64 encoded string.	encoded_string = cb.convert.string_to_b64(string1)
b64_to_string	converts only Base64 encoded string back UTF-8 encoded string.	original_string = cb.convert.b64_to_string(encoded_string)
string_to_array	converts base64 string to int array with value range 0-63.	array = cb.convert.string_to_array(encoded_string)
array_to_string	converts int array with value range 0-63 back to UTF-8 string.	encoded_string = cb.convert.string_to_array(array)

Padding:

consists of array padding and removing function. works in PKCS style.

function	description	code example
pad	padd's the array in PKCS standard to lenght specified by user.	array_with_padding = cb.padding.pad(array_without_padding,block_size)
pad_REMOVE	removes the padding from the array.	array_without_padding = cb.padding.pad_REMOVE(array_with_padding)

Process:

consists of general cryptography related math functions.

function	description	code example
XOR_array	performs XOR between two arrays of same length.	XOR_of_arrays = cb.process.XOR_array(array1,array2)
ADD_array	performs ADD between (array1,array2) of same lengh with (mod 64).	ADD_of_arrays = cb.process.ADD_array(array1,array2)
shift	performs shift operation on array in left or right direction by specified amount.	shifted_array = cb.process.shift(array1,shiftamount,direction)
s_box	performs substititution on the array with reference from sbox array.	substituted_array = cb.process.s_box(array1,s_box)
s_box_inverse	performs inverse substititution on the array with reference from sbox array.Used in decryption	inverse_substituted_array = cb.process.s_box_inverse(array1,s_box)
p_box	performs permutation on the array with reference from pbox array.	permutated_array = cb.process.p_box(array1,p_box)
p_box_inverse	performs inverse permutation on the array with reference from pbox array.Used in decryption	inverse_permutated_array = cb.process.p_box_inverse(array1,p_box)
swap_half	swaps the two half in the array (use shift if you want to swap at custom position).	swapped_array = cb.process.swap_half(array1)

Generate:

consists of tools to generate string,arrays and S&P Box generators with cryptographically secure methods.

function	description	code example
box_generate	generates an array of size mentioned with elements from {0,size-1} in random order and also returns its inverse.	s_box,inv_s_box=cb.generate.box_generate(boxsize)
string_generate	generates a string of mentiond size with random base64 characters	random_string=cb.generate.string_generate(stringsize)
array_generate	generates a numpy array of lenght (size) with value between {0,63}.	random_array=cb.generate.array_generate(arraysize)