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fix API to reflect that the 0-state is the most permissive state

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This commit is contained in:
bunnie 2025-11-06 14:10:00 +08:00
parent 12d0728582
commit d91c2e7671
2 changed files with 7 additions and 5 deletions
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7
libs/bao1x-api/src/offsets.rs
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@ -213,7 +213,8 @@ pub enum RwPerms {
/// Specifies what partitions can access a given slot. Some common patterns are
/// provided, a Custom field is also provided for other odd combinations.
pub enum PartitionAccess {
None,
/// Open disables not just PartitionAccess but also all other security controls
Open,
All,
Boot0,
Boot1,
@ -235,7 +236,7 @@ impl PartitionAccess {
// The bitfield coding is fw1:fw0:boot1:boot0 from MSB to LSB.
let code: u4 = u4::new(((raw >> 20) & 0xF) as u8);
match code.value() {
0b0000 => Self::None,
0b0000 => Self::Open,
0b1111 => Self::All,
0b0001 => Self::Boot0,
0b0010 => Self::Boot1,
@ -251,7 +252,7 @@ impl PartitionAccess {
// can be shifted into place.
fn to_raw_u4(&self) -> u4 {
match self {
Self::None => u4::new(0b0000 & 0xF),
Self::Open => u4::new(0b0000 & 0xF),
Self::All => u4::new(0b1111 & 0xF),
Self::Boot0 => u4::new(0b0001 & 0xF),
Self::Boot1 => u4::new(0b0010 & 0xF),

5
libs/bao1x-api/src/offsets/common.rs
View file

@ -168,8 +168,9 @@ pub const SERIAL_NUMBER: SlotIndex = SlotIndex::Data(0, PartitionAccess::All, Rw
/// `UUID` is a 256-bit random number that can be used as a UUID for the chip. It is publicly
/// readable and generated by a TRNG. This is suitable for putting into a KDF and generating
/// salts for algorithms that require such a parameter.
pub const UUID: SlotIndex = SlotIndex::Data(1, PartitionAccess::All, RwPerms::ReadOnly);
/// salts for algorithms that require such a parameter. The UUID is changeable, but changing
/// will cause all derived keys to be changed as well.
pub const UUID: SlotIndex = SlotIndex::Data(1, PartitionAccess::Open, RwPerms::ReadWrite);
/// `IFR_HASH` is a provisional slot for a hash of the IFR region. Whether the hash is meaningful
/// or not depends on if the chip is booted before it is sealed. At the time of writing, it's