rsa加密算法python

RSA是一种非对称加密算法，用于加密的密钥和用于解密的密钥不是同一个。RSA可以根据密钥的大小改变分组大小，如果加密的数据不是分组大小的整数倍，则会根据具体的应用方式增加额外的填充位。在Python中，可以使用Crypto库实现RSA加密算法。具体实现过程包括生成公钥和私钥，加密数据和解密数据，签名和解签等步骤。可以参考以下代码实现RSA加密算法：

from Crypto import Random
from Crypto.PublicKey import RSA
from Crypto.Cipher import PKCS1_v1_5 as Cipher_pkcs1_v1_5

# 生成随机偏移量
random_generator = Random.new().read

# 生成一个私钥
rsa = RSA.generate(2048, random_generator)

# 导出私钥
private_key = rsa.exportKey()

# 生成私钥所对应的公钥
public_key = rsa.publickey().exportKey()

# 将私钥内容写入文件中
with open('rsa_private_key.pem', 'wb')as f:
    f.write(private_key)

# 将公钥内容写入文件中
with open('rsa_public_key.pem', 'wb')as f:
    f.write(public_key)

# 加密数据
message = 'Hello, world!'
with open('rsa_public_key.pem', 'rb') as f:
    key = f.read()
    rsakey = RSA.importKey(key)
    cipher = Cipher_pkcs1_v1_5.new(rsakey)
    cipher_text = cipher.encrypt(message.encode())

# 解密数据
with open('rsa_private_key.pem', 'rb') as f:
    key = f.read()
    rsakey = RSA.importKey(key)
    cipher = Cipher_pkcs1_v1_5.new(rsakey)
    text = cipher.decrypt(cipher_text, random_generator)

# 签名
with open('rsa_private_key.pem', 'rb') as f:
    key = f.read()
    rsakey = RSA.importKey(key)
    signer = Signature_pkcs1_v1_5.new(rsakey)
    digest = SHA.new()
    digest.update(message.encode())
    sign = signer.sign(digest)

# 验证签名
with open('rsa_public_key.pem', 'rb') as f:
    key = f.read()
    rsakey = RSA.importKey(key)
    verifier = Signature_pkcs1_v1_5.new(rsakey)
    digest = SHA.new()
    digest.update(message.encode())
    is_verify = verifier.verify(digest, sign)

print('加密后的数据：', cipher_text)
print('解密后的数据：', text.decode())
print('签名：', sign)
print('验证签名结果：', is_verify)