Conversion of identity hashes

dotnet-identity-hash.py

from base64 import b64decode,b64encode
from struct import pack,unpack
from binascii import hexlify
import sys

def u32(x): return unpack(">I", x)[0]
def p32(x): return pack(">I", x)

hash = b64decode(sys.argv[1]).replace(b"-",b"")

assert len(hash) == 61

version = hash[0]
assert version == 0x01

prf = ['sha1','sha256','sha512'][u32(hash[1:][:4])] # KeyDerivationPrf
iterations = u32(hash[5:][:4])
salt_len = u32(hash[9:][:4])
salt = b64encode(hash[13:][:salt_len]).decode()
subkey = b64encode(hash[13+salt_len:]).decode()

print(f"{prf}:{iterations}:{salt}:{subkey}")

## reverse, create the b64 hash
## e.g. use to generate: https://8gwifi.org/pbkdf.jsp

salt = b64decode("xx") 
subkey = b64decode("xx")
salt_len = p32(len(salt))
iterations = p32(10000)
prf = p32(0x01)
version = b'\x01'

hash = version+prf+iterations+salt_len+salt+subkey
print(b64encode(hash))