android - JSON Store password maximum length - IBM MobileFirst Platform Foundation 6.3 -

i have created app in ibm mobilefirst platform foundation 6.3 targetting android , iphone devices [windows phone in future]. app uses json store feature.

following procedures.

1. ask password user.
2. once user entered password, encrypt of sha256.[when converting password string encrypted format [sha256], getting 64 characters.]
3. now use encrypted password protecting json store.

when tested scenario in android , iphone devices, it's working perfect.
questions are:

1. i using 64 characters json store password, affect performance of app in case.
2. what maximum length of json store password.

there no known limitations or recorded performance degradation due information you've supplied.

i suggest play scenario out , see how affects application , proceed there.