公钥加密 /** * 公钥加密 * * @param data 待加密数据 * @param key 公钥 * @return byte[] 加密数据 */ public static String encryptByPublicKey(byte[] data, byte[] key) { try { KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM); X509EncodedKeySpec keySpec = new X509EncodedKeySpec(key); PublicKey publicKey = keyFactory.generatePublic(keySpec); // 加密 Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm()); cipher.init(Cipher.ENCRYPT_MODE, publicKey); int inputLength = data.length; // 最大加密字节数，超出最大字节数需要分组加密 int MAX_ENCRYPT_BLOCK = 117; // 标识 int offSet = 0; byte[] resultBytes = {}; byte[] cache = {}; while (inputLength - offSet > 0) { if (inputLength - offSet > MAX_ENCRYPT_BLOCK) { cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK); offSet += MAX_ENCRYPT_BLOCK; } else { cache = cipher.doFinal(data, offSet, inputLength - offSet); offSet = inputLength; } resultBytes = Arrays.copyOf(resultBytes, resultBytes.length + cache.length); System.arraycopy(cache, 0, resultBytes, resultBytes.length - cache.length, cache.length); } return Base64Utils.encodeToString(resultBytes); } catch (Exception e) { log.error("rsaEncrypt error:" + e.getMessage()); } return null; }请你将该段代码改写成Python

以下是 Python 中等价的代码：

import base64
from Crypto.PublicKey import RSA
from Crypto.Cipher import PKCS1_v1_5

# 公钥加密
def encryptByPublicKey(data, key):
    try:
        key = RSA.import_key(key)
        cipher = PKCS1_v1_5.new(key)
        # 最大加密字节数，超出最大字节数需要分组加密
        MAX_ENCRYPT_BLOCK = 117
        inputLength = len(data)
        offSet = 0
        resultBytes = b''
        while inputLength - offSet > 0:
            if inputLength - offSet > MAX_ENCRYPT_BLOCK:
                cache = cipher.encrypt(data[offSet:offSet+MAX_ENCRYPT_BLOCK])
                offSet += MAX_ENCRYPT_BLOCK
            else:
                cache = cipher.encrypt(data[offSet:inputLength])
                offSet = inputLength
            resultBytes += cache
        return base64.b64encode(resultBytes).decode('utf-8')
    except Exception as e:
        print('rsaEncrypt error:', str(e))
    return None

需要使用 pycryptodome 库，可以使用 `pip install pycryptodome` 安装。由于 RSA 加密不支持直接加密大于密钥长度的数据，因此需要分组加密。在 Python 中，使用 `Crypto.Cipher.PKCS1_v1_5` 模块实现 RSA 加密。