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unusual hashing scheme, not designed for passwords but for sending client ID's publicly in shorter strings, adds random bytes to a truncated sha256
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from __future__ import absolute_import, division, print_function | |
import hashlib | |
from Crypto import Random | |
def myhash(data, iv_length=8, hash_length=16): | |
''' | |
my hash scheme made to behave somewhat like bcrypt by having an IV | |
this is randomly generated and attached to the front of the hash, it is also injected into the sha256 hash | |
this ensures the hash is generated different | |
the hash is designed to obscure some operating information of my covert software where bcrypt would be the best choice but is too long | |
the default setting is 8 bytes of IV randomness, 16 bytes of a sha256, making a total of 24 bytes or 48 hex chars in a string | |
this is possibly the shortest hash that has a random output, another alternative would be using AES, encrypt 0000s with password | |
''' | |
print('hash complexity:', 2**(hash_length * 8)) | |
print('hash random permutations:', 2**(iv_length * 8)) | |
m = hashlib.sha256() | |
iv = Random.new().read(iv_length) # generate radom bytes to pass through hash before the data | |
m.update(iv) | |
m.update(data) | |
m = m.digest() | |
m = iv + m[0:hash_length] | |
print('generated myhash:', m.encode('hex')) | |
print('length = {} bytes, {} hex chars'.format(len(m), len(m) * 2)) | |
return m | |
def myhash_checkpw(password, hashed_password, iv_length=8, hash_length=16): | |
m = hashlib.sha256() | |
iv = hashed_password[0:iv_length] | |
hashed_password = hashed_password[iv_length:] | |
m.update(iv) | |
m.update(password) | |
m = m.digest()[0:hash_length] | |
return hashed_password == m | |
pass | |
s = 'hashme' | |
s_hash = myhash(s) | |
print(myhash_checkpw(s, s_hash)) #confirm match | |
print(myhash_checkpw(s, 'd85fafd83a089773d6ab450b4529a1e7a06b49afebcc375b'.decode('hex'))) #and also this key i made earlier |
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has a dependancy on pycrypto, this can easily be changed to raw python for no library dependancies