帮我写一个web端RSA签名验签的Python代码

好的，以下是一个简单的web端RSA签名验签的Python代码：

import base64
import hashlib
from Crypto.PublicKey import RSA
from Crypto.Signature import PKCS1_v1_5
from Crypto.Cipher import PKCS1_v1_5 as Cipher_PKCS1_v1_5
from Crypto.Hash import SHA256

# 生成RSA公私钥对
def generate_key_pair():
    key = RSA.generate(1024)
    private_key = key.export_key()
    public_key = key.publickey().export_key()
    return private_key, public_key

# RSA签名
def rsa_sign(message, private_key):
    key = RSA.import_key(private_key)
    h = SHA256.new(message.encode())
    signer = PKCS1_v1_5.new(key)
    signature = signer.sign(h)
    return base64.b64encode(signature).decode()

# RSA验签
def rsa_verify(message, signature, public_key):
    key = RSA.import_key(public_key)
    h = SHA256.new(message.encode())
    verifier = PKCS1_v1_5.new(key)
    signature = base64.b64decode(signature)
    return verifier.verify(h, signature)

# RSA加密
def rsa_encrypt(message, public_key):
    key = RSA.import_key(public_key)
    cipher = Cipher_PKCS1_v1_5.new(key)
    ciphertext = cipher.encrypt(message.encode())
    return base64.b64encode(ciphertext).decode()

# RSA解密
def rsa_decrypt(ciphertext, private_key):
    key = RSA.import_key(private_key)
    cipher = Cipher_PKCS1_v1_5.new(key)
    message = cipher.decrypt(base64.b64decode(ciphertext), None)
    return message.decode()

# 测试代码
if __name__ == '__main__':
    # 生成RSA公私钥对
    private_key, public_key = generate_key_pair()

    # 签名
    message = 'hello world'
    signature = rsa_sign(message, private_key)
    print('signature:', signature)

    # 验签
    is_valid = rsa_verify(message, signature, public_key)
    print('is_valid:', is_valid)

    # 加密
    ciphertext = rsa_encrypt(message, public_key)
    print('ciphertext:', ciphertext)

    # 解密
    plaintext = rsa_decrypt(ciphertext, private_key)
    print('plaintext:', plaintext)

这段代码使用了Python的`Crypto`库来实现RSA签名验签和加密解密功能。你可以根据自己的需求进行修改和调整。需要注意的是，这里的代码只是一个简单的示例，实际使用时需要保证数据的安全性和完整性。