Keystone 3 firmware

This commit hardens how a hardware wallet (Keystone 3) handles sensitive RSA prime numbers used for Arweave transactions. It adds explicit length checks on seeds and prime inputs, switches to a safer memory-clearing helper (`zeroize` in Rust, `memset_s`/`CLEAR_ARRAY` in C), and removes an unused RSA helper that could have accepted arbitrary-length secrets. The changes reduce the risk of crashes, memory leaks of secret material, and misuse of malformed keys, but the commit itself is a defensive refactor rather than a fix for a confirmed active exploit.

This commit is a code review and cleanup pass for the Avalanche (AVAX) app in the Keystone 3 hardware wallet firmware. It fixes typos in transaction type names, adds a few length checks before reading transaction bytes, replaces direct low-level signing with a safer helper, and consolidates signing code so AVAX, IOTA, and SUI share the same secure path. Most changes are defensive hardening and refactoring rather than a single obvious critical bug fix.

This commit only updates unit tests for the Avalanche transaction parser. It swaps test blockchain IDs from mainnet to testnet values, removes debug print statements, fixes an import order warning, and replaces placeholder assertions with real ones. There is no change to production code that handles user funds or device security.

This is a large cleanup commit titled 'chore: fix warning'. It removes compiler warnings across many Rust modules by deleting unused imports, switching to modern Rust syntax, and fixing minor style issues. The most notable functional change is in the Monero code, where randomness for key-image generation and encryption now comes from the operating system's secure random source (OsRng) instead of a deterministic seed derived from the request data. That change is a security improvement, not a vulnerability. There is no clear evidence in the commit of an exploitable security bug.

This commit is a routine cleanup of Rust compiler warnings (Clippy lints). It removes unused imports, rewrites idiomatically cleaner code, fixes variable naming, and updates a few function signatures. There is no indication it fixes a security vulnerability or changes security-critical behavior.

This commit is purely a code cleanup: it runs the Rust formatter (fmt) and applies Clippy lint suggestions. The changes are cosmetic—reformatting lines, reordering imports, removing unused imports, and adding 'unsafe' markers to functions that already contained unsafe operations. There is no functional change to how the firmware handles keys, transactions, or user data, and no security vulnerability is introduced or fixed.

This commit adds one line that turns off a 'quick access' toggle for the passphrase feature whenever the passphrase text is cleared. Without this fix, the toggle could stay enabled unexpectedly, potentially causing the device to remember or expose passphrase-related settings in a state the user did not intend. The change is defensive and improves safety, but the diff alone does not prove an exploitable vulnerability exists.

This commit adds code that clears the optional passphrase text from the screen and resets its visibility to hidden (password mode) whenever the user navigates back from passphrase entry during wallet creation, import, or settings. It also refactors how the 'show/hide' eye icon is controlled. The change looks like a cleanup fix to prevent a sensitive passphrase from lingering on screen or staying visible after a user leaves the page, which could reduce the risk of shoulder-surfing or accidental disclosure.

This is a large code-cleanup commit titled 'fix: run fmt and rust fix'. It applies Rust formatting, clippy lint fixes, and removes unstable nightly feature flags across many Rust files in the Keystone 3 firmware. The changes are mostly stylistic or idiomatic (e.g., replacing manual loops with while-let, using OsRng instead of deterministic seeds for Monero bulletproofs/CLSAG signatures, changing pointer-safety annotations to unsafe, and removing unused imports). There is no explicit vendor statement that this fixes a security vulnerability, and the diff does not show a clear, exploitable bug fix. However, the Monero RNG change is a meaningful functional change that could affect cryptographic security if the prior deterministic seeding was flawed, and the broad unsafe FFI annotation changes could hide or expose memory-safety issues. Overall the commit appears to be a routine refactor/tooling fix rather than a targeted security patch.

This commit adds the ability to set a BIP-39 passphrase during wallet creation and import, not just afterward in settings. Most of the change is UI flow wiring, but it also fixes a small bug in the SLIP-39 salt construction and adds a length check for passphrases. There is no clear security vulnerability introduced by the patch itself; the main risk is that passphrase handling is complex and any mistake could lock users out of funds or, in edge cases, weaken key derivation.

This commit adds a user-facing option to scramble the numeric PIN keypad layout on the Keystone 3 hardware wallet. When enabled, the digits appear in a random order each time, making it harder for someone watching or filming the screen to guess the PIN from finger positions. It is a security-hardening feature, not a fix for an active vulnerability, and it is off by default.

This commit adds Dogecoin support for multi-signature wallet addresses in a hardware wallet firmware. It lets the device create Dogecoin multi-sig addresses and sort public keys before building the address. There is also a trivial whitespace change in a UI file. The changes look like normal feature work, but adding new address handling always carries a small risk of address-generation mistakes that could make funds hard or impossible to spend.

This commit adds support for signing extended PSBTs for several UTXO-based coins (Litecoin, Dogecoin, Dash, Bitcoin Cash) in the Keystone 3 hardware wallet firmware. It also contains several changes that look like temporary debug or development shortcuts rather than production-hardened code: a hardcoded return value that hides the real battery percentage, disabling a boot-version mismatch warning, sending real UART output in production builds, and pointing Rust dependencies to a local path on a developer's Windows machine. These shortcuts reduce the device's defensive posture but are not, by themselves, a remote exploit.

This commit adds support for the SLIP39 standard (a way to split a wallet backup into multiple shares) to the Cardano wallet features of a Keystone hardware wallet. It is a feature addition, not a clear security fix. The code changes how Cardano master keys are derived when a SLIP39 wallet is used, and removes several UI blocks that previously disabled Cardano for SLIP39 users. There is no vendor statement or external report saying this commit fixes a vulnerability.