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Find the next free key in a linear way

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This commit is contained in:
Julien Cretin
2020-12-09 10:52:51 +01:00
parent 8965c6c8fb
commit 776093a68b
1 changed files with 15 additions and 7 deletions
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22
src/ctap/storage.rs
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@@ -23,7 +23,6 @@ use crate::ctap::status_code::Ctap2StatusCode;
use crate::ctap::INITIAL_SIGNATURE_COUNTER;
#[cfg(feature = "with_ctap2_1")]
use alloc::string::String;
#[cfg(any(test, feature = "ram_storage", feature = "with_ctap2_1"))]
use alloc::vec;
use alloc::vec::Vec;
use arrayref::array_ref;
@@ -206,12 +205,19 @@ impl PersistentStore {
) -> Result<(), Ctap2StatusCode> {
// Holds the key of the existing credential if this is an update.
let mut old_key = None;
// Holds the unordered list of used keys.
let mut keys = Vec::new();
let min_key = key::CREDENTIALS.start;
// Holds whether a key is used (indices are shifted by min_key).
let mut keys = vec![false; MAX_SUPPORTED_RESIDENTIAL_KEYS];
let mut iter_result = Ok(());
let iter = self.iter_credentials(&mut iter_result)?;
for (key, credential) in iter {
keys.push(key);
if key < min_key
|| key - min_key >= MAX_SUPPORTED_RESIDENTIAL_KEYS
|| keys[key - min_key]
{
return Err(Ctap2StatusCode::CTAP2_ERR_VENDOR_INTERNAL_ERROR);
}
keys[key - min_key] = true;
if credential.rp_id == new_credential.rp_id
&& credential.user_handle == new_credential.user_handle
{
@@ -222,15 +228,17 @@ impl PersistentStore {
}
}
iter_result?;
if old_key.is_none() && keys.len() >= MAX_SUPPORTED_RESIDENTIAL_KEYS {
if old_key.is_none()
&& keys.iter().filter(|&&x| x).count() >= MAX_SUPPORTED_RESIDENTIAL_KEYS
{
return Err(Ctap2StatusCode::CTAP2_ERR_KEY_STORE_FULL);
}
let key = match old_key {
// This is a new credential being added, we need to allocate a free key. We choose the
// first available key. This is quadratic in the number of existing keys.
// first available key.
None => key::CREDENTIALS
.take(MAX_SUPPORTED_RESIDENTIAL_KEYS)
.find(|key| !keys.contains(key))
.find(|key| !keys[key - min_key])
.ok_or(Ctap2StatusCode::CTAP2_ERR_VENDOR_INTERNAL_ERROR)?,
// This is an existing credential being updated, we reuse its key.
Some(x) => x,