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Fix for the documentation in TimeStampToken.aidl. HMAC computation will always use 1, which is the value of SecurityLevel.TRUSTED_ENVIRONMENT. This is done for backwards compatibility purpose.

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Test: N/A
Bug: None.

Change-Id: I1fd979908103f9095cc7c306e0d5036d6b357b30
This commit is contained in:
Chirag Pathak
2021-05-25 16:01:27 +00:00
committed by Shawn Willden
parent 4477ee052f
commit 8ac0743508
1 changed files with 2 additions and 4 deletions
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6
security/secureclock/aidl/android/hardware/security/secureclock/TimeStampToken.aidl
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@@ -39,7 +39,7 @@ parcelable TimeStampToken {
* 32-byte HMAC-SHA256 of the above values, computed as:
*
* HMAC(H,
* ISecureClock.TIME_STAMP_MAC_LABEL || challenge || timestamp || securityLevel )
* ISecureClock.TIME_STAMP_MAC_LABEL || challenge || timestamp || 1 )
*
* where:
*
@@ -50,9 +50,7 @@ parcelable TimeStampToken {
* ``||'' represents concatenation
*
* The representation of challenge and timestamp is as 64-bit unsigned integers in big-endian
* order. SecurityLevel is represented as a 32-bit unsigned integer in big-endian order as
* described in android.hardware.security.keymint.SecurityLevel. It represents the security
* level of the secure clock environment.
* order. 1, above, is a 32-bit unsigned integer, also big-endian.
*/
byte[] mac;
}