Python代码怎样进行数据加密 Python代码实现加密算法的代码示例

from Cryptodome.Cipher import AES
from Cryptodome.Random import get_random_bytes
from Cryptodome.Util.Padding import pad, unpad

def aes_encrypt(data, key):
    """使用AES GCM模式加密数据"""
    # GCM模式会生成一个nonce（随机数）和一个tag（认证标签）
    # 这些都需要和密文一起存储或传输，以便解密和验证完整性
    cipher = AES.new(key, AES.MODE_GCM)
    ciphertext, tag = cipher.encrypt_and_digest(pad(data, AES.block_size))
    return cipher.nonce, ciphertext, tag

def aes_decrypt(nonce, ciphertext, tag, key):
    """使用AES GCM模式解密数据"""
    cipher = AES.new(key, AES.MODE_GCM, nonce=nonce)
    plaintext = unpad(cipher.decrypt_and_verify(ciphertext, tag), AES.block_size)
    return plaintext

# 示例
key = get_random_bytes(16) # 128位密钥，用于AES-128
message = b"This is a secret message that needs to be encrypted."

nonce, encrypted_message, tag = aes_encrypt(message, key)
print(f"加密后的Nonce: {nonce.hex()}")
print(f"加密后的密文: {encrypted_message.hex()}")
print(f"加密后的Tag: {tag.hex()}")

try:
    decrypted_message = aes_decrypt(nonce, encrypted_message, tag, key)
    print(f"解密后的明文: {decrypted_message.decode('utf-8')}")
except ValueError as e:
    print(f"解密失败或数据被篡改: {e}")

from Cryptodome.PublicKey import RSA
from Cryptodome.Cipher import PKCS1_OAEP
from Cryptodome.Hash import SHA256
from Cryptodome.Signature import pss

# 生成RSA密钥对
key = RSA.generate(2048) # 推荐至少2048位
private_key = key.export_key()
public_key = key.publickey().export_key()

print("\n--- RSA 密钥对 ---")
print(f"私钥:\n{private_key.decode()}")
print(f"公钥:\n{public_key.decode()}")

# 导入公钥进行加密
recipient_key = RSA.import_key(public_key