Python PyCryptodome库介绍与实例教程

pip install pycryptodome

from Crypto.Cipher import AES
from Crypto.Random import get_random_bytes
from Crypto.Util.Padding import pad, unpad
def encrypt_aes(plaintext, key):
    cipher = AES.new(key, AES.MODE_ECB)
    padded_data = pad(plaintext.encode(), AES.block_size)
    return cipher.encrypt(padded_data)
def decrypt_aes(ciphertext, key):
    cipher = AES.new(key, AES.MODE_ECB)
    padded_data = cipher.decrypt(ciphertext)
    return unpad(padded_data, AES.block_size).decode()
# 生成一个16字节的随机密钥
key = get_random_bytes(16)
# 加密
message = "Hello, PyCryptodome!"
encrypted = encrypt_aes(message, key)
print(f"加密后: {encrypted.hex()}")
# 解密
decrypted = decrypt_aes(encrypted, key)
print(f"解密后: {decrypted}")

from Crypto.PublicKey import RSA
from Crypto.Cipher import PKCS1_OAEP
import binascii
# 生成RSA密钥对
key = RSA.generate(2048)
private_key = key.export_key()
public_key = key.publickey().export_key()
# 加密
message = b"Hello, RSA!"
rsa_public_key = RSA.import_key(public_key)
rsa_public_key = PKCS1_OAEP.new(rsa_public_key)
encrypted = rsa_public_key.encrypt(message)
print(f"加密后: {binascii.hexlify(encrypted)}")
# 解密
rsa_private_key = RSA.import_key(private_key)
rsa_private_key = PKCS1_OAEP.new(rsa_private_key)
decrypted = rsa_private_key.decrypt(encrypted)
print(f"解密后: {decrypted.decode()}")

from Crypto.Hash import SHA256
def hash_sha256(data):
    hash_object = SHA256.new(data=data.encode())
    return hash_object.hexdigest()
message = "Hello, SHA256!"
hashed = hash_sha256(message)
print(f"SHA256哈希值: {hashed}")

from Crypto.Hash import HMAC, SHA256
def create_hmac(key, message):
    hmac = HMAC.new(key, msg=message.encode(), digestmod=SHA256)
    return hmac.hexdigest()
def verify_hmac(key, message, received_mac):
    hmac = HMAC.new(key, msg=message.encode(), digestmod=SHA256)
    try:
        hmac.hexverify(received_mac)
        return True
    except ValueError:
        return False
# 创建HMAC
secret_key = b"my_secret_key"
message = "Hello, HMAC!"
mac = create_hmac(secret_key, message)
print(f"HMAC: {mac}")
# 验证HMAC
is_valid = verify_hmac(secret_key, message, mac)
print(f"HMAC验证结果: {is_valid}")