# Functions
GetAvoidLoginSignature 个人免登场景的签名计算方法 https://developers.dingtalk.com/document/app/signature-calculation-for-logon-free-scenarios-1.
GetSignature 第三方访问接口的签名计算方法 https://developers.dingtalk.com/document/app/signature-calculation-method-for-third-party-access-interfaces-1.
NewDingTalkEncrypt 钉钉返回体.
RandomString 随机字符串.
# Constants
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