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Adam Tucker

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81 commits1 monitored projects8 candidates0 high-risk analyses
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Keystone 3 firmwareKeystone81 commits8 candidates0 high risk
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Low 42 AI analysisMessage 62 · Adequate
KS KeystoneKeystone 3 firmware BitcoinHardware wallets

fix(zcash): defer checked batch cleanup after signing

This patch changes when a Zcash batch signing screen frees a sensitive internal data structure. Instead of destroying the data immediately when the page is cleared, it now schedules the cleanup to run after the signing operation has finish…

Use-after-free / premature-free risk in cryptographic signing pathAsync deferred cleanup introduced to avoid race with FIFO signing taskInline comment explicitly describes security-relevant ordering constraint
3b8995faby Adam Tucker+32−11 file
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Low 35 AI analysisMessage 45 · Thin
KS KeystoneKeystone 3 firmware BitcoinHardware wallets

Release Zcash batch review widgets before signing

This commit fixes a potential memory/resource issue in the Zcash batch signing flow on the Keystone 3 hardware wallet. Before opening the signature view, the code now explicitly frees (destroys) the on-screen review widgets. Without this c…

Resource cleanup before sensitive signing operationUI object destruction to prevent memory pressure during cryptographic signing flowPotential UI state inconsistency mitigated by explicit widget release
2982da56by Adam Tucker+4−01 file
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Moderate 56 AI analysisMessage 45 · Thin
KS KeystoneKeystone 3 firmware BitcoinHardware wallets

Reject existing Zcash batch signatures

This firmware update changes how Keystone hardware wallets handle Zcash batch signing. Previously, the device might have accepted a transaction request that already contained spend authorization signatures. Now it rejects such requests. Th…

Defensive input validation added to reject pre-existing spend authorization signatures in Zcash batch PCZT flowPotential host-supplied signature smuggling vector in batch signing mitigatedNew unit tests cover both Orchard and Ironwood pools for the rejection behavior
a50410acby Adam Tucker+126−33 files
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Moderate 64 AI analysisMessage 45 · Thin
KS KeystoneKeystone 3 firmware BitcoinHardware wallets

Scope Zcash shielded signing to selected account

This commit fixes a bug in the Keystone 3 hardware wallet's Zcash shielded transaction signing. Previously, when a user reviewed and approved a transaction for one account, the device could accidentally authorize a spend from a different a…

Account-scoping enforcement added to shielded spend authorizationPrevents cross-account signing under same seedNew validation in PCZT check path before signing
3d14c7ddby Adam Tucker+166−296 files
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Low 43 AI analysisMessage 62 · Adequate
KS KeystoneKeystone 3 firmware BitcoinHardware wallets

fix(zcash): skip finalized dummy spends during signing

This commit fixes a bug in the Keystone hardware wallet's Zcash signing code. When signing a batch of Zcash transactions that include 'dummy' placeholder spends (zero-value decoy actions used for privacy), the signer could get stuck or fai…

Zcash privacy-spend signing bypass for finalized dummy actionsBatch-transport redaction state reproduced in regression testPotential signing failure / denial-of-service for Zcash PCZT transactions with dummy spends
9792998aby Adam Tucker+81−13 files
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Informational 15 AI analysisMessage 62 · Adequate
KS KeystoneKeystone 3 firmware BitcoinHardware wallets

refactor(zcash): rename redacted PCZT signing helper

This commit is a simple rename of an internal function from `sign_pczt_to_pczt` to `sign_and_redact_pczt` in the Zcash Rust code. No behavior, logic, or security properties changed; it only makes the function name more descriptive. There i…

01bd8e2bby Adam Tucker+4−42 files
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Moderate 54 AI analysisMessage 100 · Strong
KS KeystoneKeystone 3 firmware BitcoinHardware wallets

fix(zcash): sign shielded PCZTs without RoleSigner to fit the device stack

This commit fixes a crash in the Keystone hardware wallet when signing certain advanced Zcash transactions. The previous code used a heavy upstream signing helper that needed too much memory, causing the device to reset during an Orchard-t…

Stack overflow / device reset in signing task due to excessive stack usage by upstream RoleSignerReplacement of heavy upstream signer with lean in-repo low_level_signer to fit device stack budgetAddition of consensus-critical NU6.3 v6 Orchard/Ironwood sighash domains in pczt_ext
11592ebcby Adam Tucker+603−2173 files
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Low 37 AI analysisMessage 45 · Thin
KS KeystoneKeystone 3 firmware BitcoinHardware wallets

Add Zcash batch signing for shielded PCZTs

This commit adds a new Zcash batch-signing feature for shielded transactions and fixes a UI bug where Zcash signing could freeze if the response QR code could not be generated. The changes introduce new Rust code to validate, parse, and si…

New batch signing path for Zcash shielded PCZTs with 35-message limitAtomic batch semantics: any invalid message aborts the whole batchPreflight check `ensure_pczt_has_signable_shielded_action` prevents silent no-signature results
745330f6by Adam Tucker+2201−5232 files
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