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Configure the number of pages in the board

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This permits to have portable apps.
This commit is contained in:
Julien Cretin
2021-08-15 22:39:13 +02:00
committed by Julien Cretin
parent c1f2551d0d
commit 2d5fdd1034
12 changed files with 77 additions and 79 deletions
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17
src/ctap/customization.rs
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@@ -219,23 +219,10 @@ pub const MAX_RP_IDS_LENGTH: usize = 8;
///
/// - The storage key CREDENTIALS must fit at least this number of credentials.
///
/// This value has implications on the flash lifetime, please see the
/// documentation for NUM_PAGES below.
pub const MAX_SUPPORTED_RESIDENT_KEYS: usize = 150;
/// Sets the number of pages used for persistent storage.
///
/// The number of pages should be at least 3 and at most what the flash can
/// hold. There should be no reason to put a small number here, except that the
/// latency of flash operations is linear in the number of pages. This may
/// improve in the future. Currently, using 20 pages gives between 20ms and
/// 240ms per operation. The rule of thumb is between 1ms and 12ms per
/// additional page.
///
/// Limiting the number of resident keys permits to ensure a minimum number of
/// counter increments.
/// Let:
/// - P the number of pages (NUM_PAGES)
/// - P the number of pages (NUM_PAGES in the board definition)
/// - K the maximum number of resident keys (MAX_SUPPORTED_RESIDENT_KEYS)
/// - S the maximum size of a resident key (about 500)
/// - C the number of erase cycles (10000)
@@ -245,7 +232,7 @@ pub const MAX_SUPPORTED_RESIDENT_KEYS: usize = 150;
///
/// With P=20 and K=150, we have I=2M which is enough for 500 increments per day
/// for 10 years.
pub const NUM_PAGES: usize = 20;
pub const MAX_SUPPORTED_RESIDENT_KEYS: usize = 150;
#[cfg(test)]
mod test {

3
src/ctap/storage.rs
View File

@@ -18,7 +18,6 @@ use crate::ctap::client_pin::PIN_AUTH_LENGTH;
use crate::ctap::customization::{
DEFAULT_MIN_PIN_LENGTH, DEFAULT_MIN_PIN_LENGTH_RP_IDS, ENFORCE_ALWAYS_UV,
MAX_LARGE_BLOB_ARRAY_SIZE, MAX_PIN_RETRIES, MAX_RP_IDS_LENGTH, MAX_SUPPORTED_RESIDENT_KEYS,
NUM_PAGES,
};
use crate::ctap::data_formats::{
extract_array, extract_text_string, CredentialProtectionPolicy, PublicKeyCredentialSource,
@@ -68,7 +67,7 @@ impl PersistentStore {
///
/// This should be at most one instance of persistent store per program lifetime.
pub fn new(rng: &mut impl Rng256) -> PersistentStore {
let storage = new_storage(NUM_PAGES);
let storage = new_storage().ok().unwrap();
let mut store = PersistentStore {
store: persistent_store::Store::new(storage).ok().unwrap(),
};