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Matt Gleason

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53 commits1 monitored projects13 candidates0 high-risk analyses
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Passport firmwareFoundation53 commits13 candidates0 high risk
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Low 47 AI analysisMessage 50 · Thin
FD FoundationPassport firmware BitcoinHardware wallets

SFT-6378: removed more branching from mnemonic decode process

This commit tweaks the code that converts a user's BIP39 recovery phrase (mnemonic words) into secret bits inside a hardware wallet. The change removes an 'if' branch during word copying so the loop always writes to the same positions, reg…

Branchless, constant-time-style copy of sensitive input wordsMasking of post-delimiter bytes to zero to avoid information leakage via memory access patternsRemoval of conditional stores that depended on word length
d0edb18aby Matt Gleason+13−71 file
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Informational 15 AI analysisMessage 45 · Thin
FD FoundationPassport firmware BitcoinHardware wallets

SFT-6378: refined more comments

This commit only rewrites two code comments in a BIP39 mnemonic parser to be shorter and clearer. It does not change any executable code, logic, or behavior. There is no security-relevant change.

e58baa89by Matt Gleason+2−31 file
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Informational 15 AI analysisMessage 35 · Opaque
FD FoundationPassport firmware BitcoinHardware wallets

SFT-6378: improved comments

This commit only rewrites comments in a source file that handles BIP39 seed phrases. No code logic, buffer sizes, or function behavior were changed. It is a documentation-only cleanup and does not affect security.

42cad0d8by Matt Gleason+9−31 file
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Moderate 63 AI analysisMessage 60 · Adequate
FD FoundationPassport firmware BitcoinHardware wallets

SFT-6378: responded to more feedback, needs testing and evaluation

This commit hardens the code that converts a user's BIP39 recovery phrase (seed words) into secret bits. It fixes a bug where 8-character words were wrongly rejected, makes the loop length independent of the number of words to reduce timin…

Timing-side-channel mitigation: outer loop iteration count made independent of mnemonic word countOut-of-bounds read prevention: inner loop index bounded against sizeof(padded)-1Off-by-one fix: inner loop bound changed from BIP39_MAX_WORD_LEN-1 to BIP39_MAX_WORD_LEN
42f95ed8by Matt Gleason+25−181 file
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Moderate 59 AI analysisMessage 50 · Thin
FD FoundationPassport firmware BitcoinHardware wallets

SFT-6378: made more parts of mnemonic parsing and fetching constant time

This commit hardens the code that converts a user's BIP-39 seed phrase into secret data. It removes timing and loop-behavior clues that an attacker with physical access might measure to learn how many words the phrase has, how long each wo…

Constant-time / secret-independent control-flow hardeningRemoval of input-length-dependent loops in mnemonic parsingRemoval of early returns on invalid word length
5a0cc5edby Matt Gleason+52−183 files
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Low 49 AI analysisMessage 75 · Adequate
FD FoundationPassport firmware BitcoinHardware wallets

SFT-6378: first pass at anti-sidechannel round 2, needs testing and evaluation

This commit is a defensive hardening change for the BIP-39 seed-word handling code in the Passport hardware wallet firmware. It restructures how the English word list is stored so that a constant-time word comparison function can safely re…

Constant-time/side-channel hardeningFixed-width wordlist storage to avoid out-of-bounds reads in constant-time comparisonRemoval of unreliable wall-clock timing assertions from CI tests
2c7dc29fby Matt Gleason+22−224 files
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Informational 12 AI analysisMessage 45 · Thin
FD FoundationPassport firmware BitcoinHardware wallets

SFT-3834: added microsd message signing

This commit adds a new menu option that lets users sign a message using a file stored on a microSD card, alongside the existing option to sign by scanning a QR code. It reuses the same internal signing logic that was already used for healt…

No new cryptographic operations introduced; existing sign_text_file_task is reusedNo changes to input validation length checks or address-type handlingFile filter now excludes files containing '-signed' to avoid re-signing output files
e47977e3by Matt Gleason+37−114 files
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