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John Boyd

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6 commits1 monitored projects2 candidates0 high-risk analyses
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Keystone 3 firmwareKeystone6 commits2 candidates0 high risk
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Informational 19 AI analysisMessage 85 · Strong
KS KeystoneKeystone 3 firmware BitcoinHardware wallets

fix: guard Solana USB pubkey service for non-web3 builds

This commit fixes a firmware build problem, not a runtime security bug. The Solana USB public-key service was calling a function that only exists in the multi-coin 'web3' firmware variant, so the more limited 'cypherpunk' and 'bitcoin-only…

Build/link-time failure fix for conditional feature compilationExplicit error response added for unsupported coin type on non-web3 buildsNo input validation, memory safety, or cryptographic changes observed
9d04150dby John Boyd+10−01 file
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Informational 20 AI analysisMessage 85 · Strong
KS KeystoneKeystone 3 firmware BitcoinHardware wallets

feat(zcash): tag outputs to the wallet's own address as Mine

This commit fixes a UI labeling bug in the Keystone hardware wallet's Zcash transaction review screen. Previously, when a user sent Zcash to one of their own shielded addresses (an 'external' address, not a change address), the device disp…

UI mislabeling of self-owned Zcash shielded outputsNew `is_mine` ownership flag propagated across Rust/C FFI boundaryNo change to signing logic, key handling, or transaction validation
9eb7f4c3by John Boyd+57−45 files
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Low 29 AI analysisMessage 100 · Strong
KS KeystoneKeystone 3 firmware BitcoinHardware wallets

feat(zcash): enable Zcash for SLIP 39 wallets with 33-word shares

This commit changes how the Keystone hardware wallet enables Zcash for SLIP 39 wallets. Previously, Zcash was completely disabled for all SLIP 39 wallets. Now it is allowed when the SLIP 39 shares are 33 words long (256-bit entropy), but s…

Relaxation of a security-motivated disablement based on entropy lengthNew entropy-length gate for Zcash supportPotential risk if entropy length check is bypassed or miscalculated
2729141bby John Boyd+46−269 files
Vendor flagged security relevance
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Moderate 59 AI analysisMessage 80 · Strong
KS KeystoneKeystone 3 firmware BitcoinHardware wallets

fix(zcash): error handling in setup functions

This commit fixes several bugs in the Zcash wallet setup code for a hardware wallet. Previously, the code could ignore errors when setting up Zcash data, leak sensitive seed material in memory, use the wrong error variable, and try to decr…

Unchecked return values in security-critical setup functionsSensitive buffer (seed) not cleared on error pathsUse of wrong variable in error-handling path (response vs responseSFP)
8a4f48edby John Boyd+47−71 file
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Informational 20 AI analysisMessage 85 · Strong
KS KeystoneKeystone 3 firmware BitcoinHardware wallets

feat(shamir): default to 33-word shares with coin-support descriptions

This commit changes the default Shamir backup share length from 20 words to 33 words and adds on-screen explanations about which cryptocurrencies each option supports. It is a usability and compatibility improvement, not a security fix or …

No memory safety defects observed; snprintf_s is used with a 4-byte buffer and a _Static_assert ensuring the value fitsNo change to key generation, seed derivation, or Shamir splitting logicNo privilege escalation, authentication bypass, or secret exposure introduced
744ef606by John Boyd+83−293 files
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Informational 12 AI analysisMessage 90 · Strong
KS KeystoneKeystone 3 firmware BitcoinHardware wallets

fix(zcash): AES tests must use non-trivial seed

This commit updates automated test code for Zcash AES encryption so the tests use a realistic seed instead of an all-zeros seed. The all-zeros seed was recently rejected by a new safety check, causing the tests to fail. The change only aff…

All-zero seed replaced by non-trivial seed in testsDecrypt test changed from hardcoded ciphertext to round-trip encryption/decryptionNo production code paths modified
db18fb88by John Boyd+17−51 file
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