增加：群聊业务

liusuyi

2024-07-06 0ab014198a8b4e40fa26da394373a4bcdb571148

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exports.encrypt = function (self, block) {
  return self._cipher.encryptBlock(block)
}
 
exports.decrypt = function (self, block) {
  return self._cipher.decryptBlock(block)
}