72 lines
2.5 KiB
Python
72 lines
2.5 KiB
Python
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import base64
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import hashlib
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import os
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import secrets
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import string
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_PBKDF2_ALGO = "sha256"
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_PBKDF2_ITERATIONS = 600_000
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_PBKDF2_SALT_LEN = 16
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_PBKDF2_PREFIX = "$pbkdf2-sha256$"
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_STRONG_PWD_CHARS = string.ascii_letters + string.digits + "!@#$%^&*"
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class PwdUtil:
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@staticmethod
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def hash_password(password: str) -> str:
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salt = os.urandom(_PBKDF2_SALT_LEN)
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dk = hashlib.pbkdf2_hmac(_PBKDF2_ALGO, password.encode(), salt, _PBKDF2_ITERATIONS)
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return f"{_PBKDF2_PREFIX}{_PBKDF2_ITERATIONS}${base64.b64encode(salt).decode()}${base64.b64encode(dk).decode()}"
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@staticmethod
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def verify_password(plain_password: str, password_hash: str) -> bool:
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try:
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_, _algo, iters_str, salt_b64, hash_b64 = password_hash.split("$")
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salt = base64.b64decode(salt_b64)
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expected = base64.b64decode(hash_b64)
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dk = hashlib.pbkdf2_hmac(_PBKDF2_ALGO, plain_password.encode(), salt, int(iters_str))
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return dk == expected
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except Exception:
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return False
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@staticmethod
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def check_password_strength(password: str) -> str | None:
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if len(password) < 6:
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return "密码长度至少6位"
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if not any(c.isupper() for c in password):
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return "密码需要包含大写字母"
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if not any(c.islower() for c in password):
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return "密码需要包含小写字母"
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if not any(c.isdigit() for c in password):
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return "密码需要包含数字"
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return None
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@staticmethod
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def generate_strong_password(length: int = 12) -> str:
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"""生成符合强度要求的强随机密码（大写+小写+数字+特殊符号）。
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使用 ``secrets`` 而非 ``random``，避免伪随机带来的安全风险。
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参数:
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- length (int): 密码长度，默认 12，最小 8。
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返回:
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- str: 生成的明文密码。
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"""
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if length < 8:
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raise ValueError("密码长度至少 8 位")
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# 保证每类字符至少出现一次
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uppercase = secrets.choice(string.ascii_uppercase)
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lowercase = secrets.choice(string.ascii_lowercase)
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digit = secrets.choice(string.digits)
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special = secrets.choice("!@#$%^&*")
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remaining_length = length - 4
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rest = [secrets.choice(_STRONG_PWD_CHARS) for _ in range(remaining_length)]
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chars = list(rest) + [uppercase, lowercase, digit, special]
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secrets.SystemRandom().shuffle(chars)
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return "".join(chars)
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