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46 lines
1.3 KiB
46 lines
1.3 KiB
import hmac
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import struct
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import hashlib
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from binascii import hexlify, unhexlify
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def pbkdf2(password, salt, iters, keylen, digestmod=hashlib.sha1):
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"""Run the PBKDF2 (Password-Based Key Derivation Function 2) algorithm
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and return the derived key. The arguments are:
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password (bytes or bytearray) -- the input password
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salt (bytes or bytearray) -- a cryptographic salt
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iters (int) -- number of iterations
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keylen (int) -- length of key to derive
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digestmod -- a cryptographic hash function: either a module
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supporting PEP 247, a hashlib constructor, or (in Python 3.4
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or later) the name of a hash function.
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"""
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h = hmac.new(password, digestmod=digestmod)
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def prf(data):
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hm = h.copy()
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hm.update(data)
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return bytearray(hm.digest())
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key = bytearray()
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i = 1
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while len(key) < keylen:
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t = u = prf(salt + struct.pack('>i', i))
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for _ in range(iters - 1):
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u = prf(u)
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t = bytearray(x ^ y for x, y in zip(t, u))
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key += t
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i += 1
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return key[:keylen]
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def re_gen_key(pwd, key_len):
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password = pwd.encode()
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salt = unhexlify(b'1234567878563412')
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return hexlify(pbkdf2(password, salt, 500, int(key_len/2), hashlib.sha256)).decode()
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if __name__ == '__main__':
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print(re_gen_key('Python测试', 16))
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