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import hashlib | |
import binascii | |
def hmac_sha256_digest(key, msg): | |
pad_key = key + b'\x00' * (64 - (len(key) % 64)) | |
ik = bytes([0x36 ^ b for b in pad_key]) | |
ok = bytes([0x5c ^ b for b in pad_key]) | |
return hashlib.sha256(ok + hashlib.sha256(ik+msg).digest()).digest() | |
def pbkdf2_hmac_sha256(password_bytes, salt, iterations): | |
# hashlib.pbkdf2_hmac('sha256', password_bytes, salt, iterations) | |
_u1 = hmac_sha256_digest(password_bytes, salt+b'\x00\x00\x00\x01') | |
_ui = int.from_bytes(_u1, 'big') | |
for _ in range(iterations - 1): | |
_u1 = hmac_sha256_digest(password_bytes, _u1) | |
_ui ^= int.from_bytes(_u1, 'big') | |
return _ui.to_bytes(32, 'big') | |
password = b'secret' | |
salt = b'salt' | |
n = 1000 | |
assert hashlib.pbkdf2_hmac('sha256', password, salt, n) == pbkdf2_hmac_sha256(password, salt, n) |
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