android - what is the purpose of registering the hashkey on facebokk app page -

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sorry if stupid question want know purpose of registering hashkey on facebokk app page. use in application(if have use please let me know where).

the question how app authenticated using hashkey?? , how sign app using hash key??? help!!!

facebook requires additional layer of security mobile apps in form of  application signature. need put android application signature  facebook application settings. can generate signature running keytool  comes android sdk. following shows how export key app using  debug defaults specified android sdk , eclipse.

also check hash key single sign-on

also if put key hash not generated me

you invalid key error if use wrong key hash .

check login failed invalid key


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