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Commit 79cb9920 authored by Eran Messeri's avatar Eran Messeri
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Document the allowed challenge size 

KeyMint should be able to handle challenges up to 128 bytes.
Document this (and the expected error code) in Tag.aidl.

Bug: 307714384
Test: m
Change-Id: Id099dd055c81b10d777effdf364395f84d8b35c6
parent db1da1c8

security/keymint/aidl/android/hardware/security/keymint/Tag.aidl

+2 −0
Original line number Diff line number Diff line
@@ -643,6 +643,8 @@ enum Tag { 
     * Tag::ATTESTATION_CHALLENGE is used to deliver a "challenge" value to the attested key

     * generation/import methods, which must place the value in the KeyDescription SEQUENCE of the

     * attestation extension.

     * The challenge value may be up to 128 bytes. If the caller provides a bigger challenge,

     * INVALID_INPUT_LENGTH error should be returned.

     *

     * Must never appear in KeyCharacteristics.

     */