Python cryptography库及RSA非对称加密_photon_wa的博客

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使用时import该库，或该库中的一个模块

import cryptography
from cryptography.hazmat.primitives import serialization
2.生成一个秘钥，并保存
 
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives.asymmetric import rsa
from cryptography.hazmat.primitives import serialization
# call rsa.generate_private_key
private_key = rsa.generate_private_key(
    public_exponent=65537,
    key_size=2048,
    backend=default_backend()
public_key = private_key.public_key()
# store private key
pem = private_key.private_bytes(
    encoding=serialization.Encoding.PEM,
    format=serialization.PrivateFormat.PKCS8,
    encryption_algorithm=serialization.NoEncryption()
with open('private_key.pem', 'wb') as f:
    f.write(pem)
# stroe public key
pem = public_key.public_bytes(
    encoding=serialization.Encoding.PEM,
    format=serialization.PublicFormat.SubjectPublicKeyInfo
with open('public_key.pem', 'wb') as f:
    f.write(pem)
非对称加密，一般公钥发布出去，私钥自己保管，防止私钥泄露。 
3. 从文件读取秘钥
 
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import serialization
with open("private_key.pem", "rb") as key_file:
    private_key = serialization.load_pem_private_key(
        key_file.read(),
        password=None,
        backend=default_backend()
如果保存密钥时设置了密码，这里读取时，password要设置
 公钥读取类似 
4. 加密
 
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.asymmetric import padding
message = b'encrypt me!'
public_key = ... # Use one of the methods above to get your public key
encrypted = public_key.encrypt(
    message,
    padding.OAEP(
        mgf=padding.MGF1(algorithm=hashes.SHA256()),
        algorithm=hashes.SHA256(),
        label=None
RSA是一种非对称加密算法， 同一个明文， 相同公钥，两次加密得到的结果可能不一样。 
5. 解密
 
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.asymmetric import padding
encrypted = ... # From before (could have been stored then read back here)
private_key = ... # Use one of the methods above to get your public key (matches the public_key)
original_message = private_key.decrypt(
    encrypted,
    padding.OAEP(
        mgf=padding.MGF1(algorithm=hashes.SHA256()),
        algorithm=hashes.SHA256(),
        label=None
Ref:
 https://blog.csdn.net/wjiabin/article/details/85228078
 https://nitratine.net/blog/post/asymmetric-encryption-and-decryption-in-python/#encrypting
                    https://blog.csdn.net/wjiabin/article/details/85228078https://nitratine.net/blog/post/asymmetric-encryption-and-decryption-in-python/#encrypting
				已解决Python连接FTPS抛出异常：CryptographyDeprecationWarning: Python 3.6 is no longer supported by the Python core team. Therefore, support for it is deprecated in cryptography. The next release of cryptography (40.0) will be the last to support Python 3.6.
from cry
import json
from cryptography.hazmat.primitives.asymmetric import rsa
from cryptography.hazmat.primitives import serialization
from cryptography.exceptions import InvalidSignature
from c
				继上篇对 RSA 公钥模数和指数的学习，这次我们针对实际应用中 RSA 加密/解密，签名/验签 的使用，利用 Python 进行具体实现。经过查询整理，发现有三种实现方法，下面我们一一展示。
一、rsa 包的实现
首先需要安装 rsa，pip install rsa
import rsa
import base64
def rsaEncrypt(content, pubkey):
    '''...
				（1）使用cryptography模块，编写完整的AES-CBC加解密函数，函数接口为：
def encrypt_CBC(key, plaintext, iv)、def decrypt_CBC(key, ciphertext, iv)；
（2）使用pycryptodome模块，编写程序，实现RSA-OAEP加解密；
知识补充????
（1）AES是高级加密标准(Advanced Encryption Standard)的缩写，AES是最常见的对称加密算法。
对称加密算法也就是加