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Python模块教程:hashlib常用函数示例演示

  • 2026-06-22 03:44:33
Python模块教程:hashlib常用函数示例演示

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hashlib 是 Python 标准库中用于安全哈希与消息摘要的模块,提供了常见的哈希算法(如 MD5、SHA1、SHA256、SHA3、BLAKE2 等)。
主要特点:
不可逆性:从哈希值无法还原原始数据
固定长度输出:无论输入多大,输出长度固定(如 SHA256 输出 256 比特)。
雪崩效应:输入微小变化会导致输出巨大差异。
常见用途:文件完整性校验、密码存储(需加盐或慢哈希)、数字签名等。
安全提示:MD5 和 SHA1 已碰撞,不推荐用于安全敏感场景;密码存储应使用 pbkdf2_hmac、bcrypt 等慢哈希函数。

以下是一个整合后的综合示例,涵盖了 hashlib 的常用功能:基本哈希、多种算法、流式更新、加盐、PBKDF2 密钥派生、支持的算法列表等。

运行说明:代码会自动创建一个临时文件 temp_hash_demo.txt 用于演示文件哈希,计算后会自动删除。所有输出均为十六进制字符串或相关信息。
如果你的 Python 版本较低(<3.6),可能不支持 SHA3 和 BLAKE2,请使用 hashlib.algorithms_available 查看实际可用算法。
输出示例(实际值因随机盐而异):

↓ 源码如下 ↓

# -*- coding: utf-8 -*-# @Author : 小红牛# 微信公众号:wdPythonimport hashlibimport os# ====================== 1. 基本哈希计算 ======================print("=" * 50)print("1. 基本哈希计算")data = b"Hello, world!"md5 = hashlib.md5()md5.update(data)print(f"MD5 (hex): {md5.hexdigest()}")print(f"MD5 (bytes): {md5.digest()}")# 简便写法sha256_simple = hashlib.sha256(b"Hello, world!").hexdigest()print(f"SHA256 (简便): {sha256_simple}\n")# ====================== 2. 多种哈希算法 ======================print("2. 多种哈希算法")text = b"Python hashlib"print(f"原始数据: {text.decode()}")print(f"MD5     : {hashlib.md5(text).hexdigest()}")print(f"SHA-1   : {hashlib.sha1(text).hexdigest()}")print(f"SHA-256 : {hashlib.sha256(text).hexdigest()}")print(f"SHA-512 : {hashlib.sha512(text).hexdigest()}")print(f"SHA3-256: {hashlib.sha3_256(text).hexdigest()}")print(f"BLAKE2b : {hashlib.blake2b(text).hexdigest()}\n")# ====================== 3. 流式更新(模拟大文件) ======================print("3. 流式更新(模拟大文件分块)")def hash_file(filename, algo='sha256'):    """计算文件的哈希值,支持分块读取"""    h = hashlib.new(algo)    try:        with open(filename, 'rb'as f:            for chunk in iter(lambda: f.read(4096), b''):                h.update(chunk)        return h.hexdigest()    except FileNotFoundError:        return f"文件 {filename} 不存在,跳过演示"# 创建一个临时测试文件(演示用)test_file = "temp_hash_demo.txt"with open(test_file, 'w'as f:    f.write("This is a test file for hashlib demo.")print(f"创建临时文件: {test_file}")print(f"文件 SHA256: {hash_file(test_file, 'sha256')}")print(f"文件 MD5   : {hash_file(test_file, 'md5')}")os.remove(test_file)  # 清理临时文件print()# ====================== 4. 加盐哈希 ======================print("4. 加盐哈希(防彩虹表)")password = "my_secret"salt = "random_salt_123"salted = (salt + password).encode('utf-8')hashed = hashlib.sha256(salted).hexdigest()print(f"密码: {password}")print(f"盐值: {salt}")print(f"SHA256(盐+密码): {hashed}\n")# ====================== 5. PBKDF2 密钥派生(慢哈希) ======================print("5. PBKDF2(抗暴力破解)")password = b"password123"salt = os.urandom(16)  # 随机生成16字节盐dk = hashlib.pbkdf2_hmac(    'sha256',    password,    salt,    100000,   # 迭代次数,生产环境建议至少 100,000 以上    dklen=32)print(f"密码: {password.decode()}")print(f"随机盐 (hex): {salt.hex()}")print(f"派生密钥 (hex): {dk.hex()}\n")# ====================== 6. 支持的算法列表 ======================print("6. 支持的哈希算法")print(f"当前平台所有可用算法: {hashlib.algorithms_available}")print(f"保证存在的算法: {hashlib.algorithms_guaranteed}\n")# ====================== 7. 使用 new() 动态创建对象 ======================print("7. 使用 new() 动态创建")algo_name = 'sha3_512'h = hashlib.new(algo_name)h.update(b'dynamic hash')print(f"{algo_name} 结果: {h.hexdigest()}")

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  1. CONNECT:[ UseTime:0.000640s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000767s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000285s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000314s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000552s ]
  6. SELECT * FROM `set` [ RunTime:0.000229s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000522s ]
  8. SELECT * FROM `article` WHERE `id` = 487623 LIMIT 1 [ RunTime:0.000464s ]
  9. UPDATE `article` SET `lasttime` = 1783144462 WHERE `id` = 487623 [ RunTime:0.005811s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000253s ]
  11. SELECT * FROM `article` WHERE `id` < 487623 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000455s ]
  12. SELECT * FROM `article` WHERE `id` > 487623 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001377s ]
  13. SELECT * FROM `article` WHERE `id` < 487623 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004409s ]
  14. SELECT * FROM `article` WHERE `id` < 487623 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002584s ]
  15. SELECT * FROM `article` WHERE `id` < 487623 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006109s ]
0.094994s