trezor/trezor-firmware
Oct 2024 – Jan 2026
12 Months active
Languages Used
PythonCRustprotobufundefinedYAMLMakefileNone
Technical Skills
Bitcoin protocolbackend developmentsecurity best practicestestingunit testingBitcoin
Ondřej Vejpustek
PROFILE
Ondřej Vejpustek
Ondřej Vejpustek developed core security, cryptography, and testing features for the trezor/trezor-firmware repository, focusing on robust multisignature workflows, secure channel protocols, and production testing infrastructure. He engineered deterministic multisig key handling, hardened certificate validation, and implemented the Noise KK1 protocol using C and Rust, improving both device security and operational reliability. His work included refactoring embedded systems code, enhancing test coverage, and introducing stress-testing and logging for Tropic secure modules. By addressing timing side-channels, session management, and error handling, Ondřej delivered maintainable, auditable firmware that supports complex cryptographic operations and reliable deployment in production environments.
Overall Statistics
Feature vs Bugs
79%Features
Repository Contributions
97Total
Bugs
9
Commits
97
Features
33
Lines of code
12,474
Activity Months12
Your Network
52 peopleWork History
January 2026
16 Commits • 1 Features
Jan 1, 2026January 2026 monthly summary for trezor-firmware focusing on Tropic Driver Logging, Debugging, and Reliability Enhancements. Delivered extensive logging, tracing, and error handling improvements across Tropic core components, strengthening observability and stability. Implemented null-safe CLI tracing, made Tropic configuration constant, added changelog entry, and performed targeted fixes in credential handling, all contributing to higher production readiness and faster issue resolution.
16 Commits • 1 Features
Jan 1, 2026January 2026 monthly summary for trezor-firmware focusing on Tropic Driver Logging, Debugging, and Reliability Enhancements. Delivered extensive logging, tracing, and error handling improvements across Tropic core components, strengthening observability and stability. Implemented null-safe CLI tracing, made Tropic configuration constant, added changelog entry, and performed targeted fixes in credential handling, all contributing to higher production readiness and faster issue resolution.
January 2026
December 2025
1 Commits • 1 Features
Dec 1, 2025December 2025 monthly summary for trezor/trezor-firmware: Delivered Tropic Stress Test Command to validate session management and cryptographic operations under high-load conditions. The feature is implemented in core/prodtest with a dedicated stress-test workflow, supported by a focused commit. This work advances test coverage, reliability, and operational readiness for Tropic workflows.
December 2025
1 Commits • 1 Features
Dec 1, 2025December 2025 monthly summary for trezor/trezor-firmware: Delivered Tropic Stress Test Command to validate session management and cryptographic operations under high-load conditions. The feature is implemented in core/prodtest with a dedicated stress-test workflow, supported by a focused commit. This work advances test coverage, reliability, and operational readiness for Tropic workflows.
November 2025
5 Commits • 3 Features
Nov 1, 2025November 2025 monthly summary for trezor-firmware focusing on Tropic module performance, reliability, and codebase maintainability. Delivered targeted optimizations and resilience improvements to reduce latency, improve uptime, and simplify future development. Key achievements include caching Tropic certificate retrievals and change PIN counter, automatic reset and retry on alarm mode, and consolidation of memory erase/write with extraction of MAC utilities to reduce duplication and improve maintainability. These efforts translate to faster Tropic operations, more robust behavior under alarm conditions, and a cleaner, scalable codebase for future work.
5 Commits • 3 Features
Nov 1, 2025November 2025 monthly summary for trezor-firmware focusing on Tropic module performance, reliability, and codebase maintainability. Delivered targeted optimizations and resilience improvements to reduce latency, improve uptime, and simplify future development. Key achievements include caching Tropic certificate retrievals and change PIN counter, automatic reset and retry on alarm mode, and consolidation of memory erase/write with extraction of MAC utilities to reduce duplication and improve maintainability. These efforts translate to faster Tropic operations, more robust behavior under alarm conditions, and a cleaner, scalable codebase for future work.
November 2025
October 2025
14 Commits • 2 Features
Oct 1, 2025October 2025 (trezor-firmware): Consolidated security improvements and reliability in Tropic-enabled firmware. Delivered major features for Tropic secure channel initialization and session management, integrated robust PIN protection workflows, and fixed cryptographic handshake robustness. These changes reduce session re-establishment overhead, accelerate PIN operations, enhance key handling across storage/embedded contexts, and increase handshake resilience against edge cases, contributing to higher security and smoother user experience.
October 2025
14 Commits • 2 Features
Oct 1, 2025October 2025 (trezor-firmware): Consolidated security improvements and reliability in Tropic-enabled firmware. Delivered major features for Tropic secure channel initialization and session management, integrated robust PIN protection workflows, and fixed cryptographic handshake robustness. These changes reduce session re-establishment overhead, accelerate PIN operations, enhance key handling across storage/embedded contexts, and increase handshake resilience against edge cases, contributing to higher security and smoother user experience.
September 2025
9 Commits • 2 Features
Sep 1, 2025September 2025 – trezor/trezor-firmware: Delivered significant security hardening, targeted build/config cleanups, and critical bug fixes. Result: stronger security posture, more reliable deployments, and clearer maintenance paths.
9 Commits • 2 Features
Sep 1, 2025September 2025 – trezor/trezor-firmware: Delivered significant security hardening, targeted build/config cleanups, and critical bug fixes. Result: stronger security posture, more reliable deployments, and clearer maintenance paths.
September 2025
August 2025
2 Commits • 2 Features
Aug 1, 2025Month: 2025-08 — Performance review summary for trezor-firmware development. Delivered two focused code improvements that enhance maintainability and prepare the codebase for diverse HSM deployments, while preserving functional behavior. Key features delivered: - Code Quality Enhancement in core system call and MCU dispatchers: standardized style and removed redundant blank lines with no functional changes to ECC key generation or signing. Commit fd2d9d0d54cae71bea16a4339309389812869b57 (style(core): make style consistent). - Secure Channel Handshake Enhancement: introduced multi-key HSM support by enabling noise_handle_handshake_response_multiple_keys and updating secure_channel_handshake_2 to iterate over a list of public keys, enabling connections with diverse HSM configurations. Commit 58245dd51d05c3f11ce5b47b58f95d0fd5b2701a (feat(core/prodtest): set HSM public keys). Major bugs fixed: - No critical defects identified or fixed this month. Efforts focused on quality, consistency, and extensibility improvements without altering functional behavior. Overall impact and accomplishments: - Improved maintainability and readability of core dispatchers, reducing technical debt and making future contributions easier. - Enabled broader interoperability with heterogeneous HSM configurations, paving the way for easier scaling and deployment in diverse environments. - Reduced risk by avoiding functional changes while cleaning up code and hardening the secure channel interaction surface. Technologies/skills demonstrated: - C/C++ code quality, static style conformance, and refactoring discipline. - Secure channel protocol improvements and multi-key HSM support design. - Integration with handshake flow changes and HSM key provisioning in production test scaffolding. - Attention to risk management by isolating changes to non-functional areas (no ECC signing logic touched).
August 2025
2 Commits • 2 Features
Aug 1, 2025Month: 2025-08 — Performance review summary for trezor-firmware development. Delivered two focused code improvements that enhance maintainability and prepare the codebase for diverse HSM deployments, while preserving functional behavior. Key features delivered: - Code Quality Enhancement in core system call and MCU dispatchers: standardized style and removed redundant blank lines with no functional changes to ECC key generation or signing. Commit fd2d9d0d54cae71bea16a4339309389812869b57 (style(core): make style consistent). - Secure Channel Handshake Enhancement: introduced multi-key HSM support by enabling noise_handle_handshake_response_multiple_keys and updating secure_channel_handshake_2 to iterate over a list of public keys, enabling connections with diverse HSM configurations. Commit 58245dd51d05c3f11ce5b47b58f95d0fd5b2701a (feat(core/prodtest): set HSM public keys). Major bugs fixed: - No critical defects identified or fixed this month. Efforts focused on quality, consistency, and extensibility improvements without altering functional behavior. Overall impact and accomplishments: - Improved maintainability and readability of core dispatchers, reducing technical debt and making future contributions easier. - Enabled broader interoperability with heterogeneous HSM configurations, paving the way for easier scaling and deployment in diverse environments. - Reduced risk by avoiding functional changes while cleaning up code and hardening the secure channel interaction surface. Technologies/skills demonstrated: - C/C++ code quality, static style conformance, and refactoring discipline. - Secure channel protocol improvements and multi-key HSM support design. - Integration with handshake flow changes and HSM key provisioning in production test scaffolding. - Attention to risk management by isolating changes to non-functional areas (no ECC signing logic touched).
July 2025
8 Commits • 2 Features
Jul 1, 2025July 2025: Delivered Tropic prodtest framework with secure channel testing and Tropic cleanup, plus internal stability/CI maintenance. Fixed emulator build regressions and aligned dependencies (libtropic updates, ts-tvl). Result: stronger testing of secure communications and Tropic provisioning; more robust, maintainable code and CI pipelines. Technologies demonstrated: C/C++, test frameworks, API refactors, build automation, and Tropic integration.
8 Commits • 2 Features
Jul 1, 2025July 2025: Delivered Tropic prodtest framework with secure channel testing and Tropic cleanup, plus internal stability/CI maintenance. Fixed emulator build regressions and aligned dependencies (libtropic updates, ts-tvl). Result: stronger testing of secure communications and Tropic provisioning; more robust, maintainable code and CI pipelines. Technologies demonstrated: C/C++, test frameworks, API refactors, build automation, and Tropic integration.
July 2025
June 2025
9 Commits • 5 Features
Jun 1, 2025June 2025 monthly summary for trezor-firmware focusing on security hardening and production-testing tooling across the repo. Delivered multi-algorithm certificate chain validation, a secure Noise KK1 communication protocol, and production-testing workflows enabling safer, faster validation in field devices. Refactors and new commands streamline init paths, key management, and device pairing, boosting security posture and operational efficiency in production tests.
June 2025
9 Commits • 5 Features
Jun 1, 2025June 2025 monthly summary for trezor-firmware focusing on security hardening and production-testing tooling across the repo. Delivered multi-algorithm certificate chain validation, a secure Noise KK1 communication protocol, and production-testing workflows enabling safer, faster validation in field devices. Refactors and new commands streamline init paths, key management, and device pairing, boosting security posture and operational efficiency in production tests.
January 2025
2 Commits
Jan 1, 2025Month: 2025-01 Context: trezor/trezor-firmware focused on stabilizing multisig-related testing to ensure reliable validation of multisig address generation against the latest firmware changes. Directly addressed test fragility and kept fixture data aligned with evolving code. Highlights: - Stabilized multisig tests by correcting key ordering and signature-count expectations, reducing flakiness and increasing confidence in test outcomes. - Updated firmware test fixtures to reflect current code changes, ensuring ongoing test relevance and reducing maintenance overhead. - Executed targeted test-suite fixes and fixture updates across two commits to remove regressions and improve test determinism. Impact: - Higher quality assurance for multisig workflows, enabling safer firmware iteration and faster CI feedback. - Clear, auditable changes to tests and fixtures support ongoing development without regressing on multisig correctness. Technologies/Skills demonstrated: - Test stabilization, fixture maintenance, and disciplined changelog between test code and fixtures. - Version control hygiene with focused commits (test fixes and fixture updates). - Multisig validation workflows in firmware testing.
2 Commits
Jan 1, 2025Month: 2025-01 Context: trezor/trezor-firmware focused on stabilizing multisig-related testing to ensure reliable validation of multisig address generation against the latest firmware changes. Directly addressed test fragility and kept fixture data aligned with evolving code. Highlights: - Stabilized multisig tests by correcting key ordering and signature-count expectations, reducing flakiness and increasing confidence in test outcomes. - Updated firmware test fixtures to reflect current code changes, ensuring ongoing test relevance and reducing maintenance overhead. - Executed targeted test-suite fixes and fixture updates across two commits to remove regressions and improve test determinism. Impact: - Higher quality assurance for multisig workflows, enabling safer firmware iteration and faster CI feedback. - Clear, auditable changes to tests and fixtures support ongoing development without regressing on multisig correctness. Technologies/Skills demonstrated: - Test stabilization, fixture maintenance, and disciplined changelog between test code and fixtures. - Version control hygiene with focused commits (test fixes and fixture updates). - Multisig validation workflows in firmware testing.
January 2025
December 2024
2 Commits
Dec 1, 2024Monthly work summary for 2024-12 focused on firmware cryptography security improvements and multisig robustness for trezor-firmware. Delivered critical fixes and groundwork that strengthen security posture and reliability for customers and partners.
December 2024
2 Commits
Dec 1, 2024Monthly work summary for 2024-12 focused on firmware cryptography security improvements and multisig robustness for trezor-firmware. Delivered critical fixes and groundwork that strengthen security posture and reliability for customers and partners.
November 2024
26 Commits • 14 Features
Nov 1, 20242024-11 monthly summary for trezor/trezor-firmware focused on delivering robust multisig capabilities, determinism, and safer path handling, with significant cross-language binding and test enhancements. Key features delivered include MultisigPubkeyOrder and core sortedmulti support with legacy handling, Python bindings, and user-facing display; deterministic pubkey sorting across core, Python, and Rust; and removal of deprecated core paths. Major bugs fixed include fully deterministic pubkey sorting and safety enhancements in legacy code to prevent invalid state transitions (forbidding multisig-to-singlesig outputs) and per-node path usage issues. Overall impact includes safer multisig workflows, more predictable behavior, and a stronger foundation for future features, with reduced risk of invalid states in complex multisig configurations. Accomplishments also cover quality and maintainability improvements: expanded test coverage for sortedmulti, ChangeDetector refactor and tests, device test refactors, autogenerated bindings across core/python/rust, and code style/linting improvements. Technologies/skills demonstrated include C++, Rust, Python bindings, unit testing, cross-language integration, Protobuf documentation, UNIX-specific refactors, and comprehensive linting and formatting processes.
26 Commits • 14 Features
Nov 1, 20242024-11 monthly summary for trezor/trezor-firmware focused on delivering robust multisig capabilities, determinism, and safer path handling, with significant cross-language binding and test enhancements. Key features delivered include MultisigPubkeyOrder and core sortedmulti support with legacy handling, Python bindings, and user-facing display; deterministic pubkey sorting across core, Python, and Rust; and removal of deprecated core paths. Major bugs fixed include fully deterministic pubkey sorting and safety enhancements in legacy code to prevent invalid state transitions (forbidding multisig-to-singlesig outputs) and per-node path usage issues. Overall impact includes safer multisig workflows, more predictable behavior, and a stronger foundation for future features, with reduced risk of invalid states in complex multisig configurations. Accomplishments also cover quality and maintainability improvements: expanded test coverage for sortedmulti, ChangeDetector refactor and tests, device test refactors, autogenerated bindings across core/python/rust, and code style/linting improvements. Technologies/skills demonstrated include C++, Rust, Python bindings, unit testing, cross-language integration, Protobuf documentation, UNIX-specific refactors, and comprehensive linting and formatting processes.
November 2024
October 2024
3 Commits • 1 Features
Oct 1, 2024October 2024 monthly summary for trezor/trezor-firmware focusing on security-hardening and resilience in multisignature workflows. Delivered targeted derivation-path controls, reinforced integrity across multisig outputs, and expanded test coverage to validate new constraints. The work reduces risk of mis-derivation, prevents unsafe transitions from multisig to singlesig, and improves auditability of multisig operations, delivering clear business value to wallet security and compliance.
October 2024
3 Commits • 1 Features
Oct 1, 2024October 2024 monthly summary for trezor/trezor-firmware focusing on security-hardening and resilience in multisignature workflows. Delivered targeted derivation-path controls, reinforced integrity across multisig outputs, and expanded test coverage to validate new constraints. The work reduces risk of mis-derivation, prevents unsafe transitions from multisig to singlesig, and improves auditability of multisig operations, delivering clear business value to wallet security and compliance.
Activity
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Quality Metrics
Correctness92.8%
Maintainability89.4%
Architecture89.2%
Performance85.4%
AI Usage20.4%
Skills & Technologies
Programming Languages
CMakefileNonePythonRustYAMLprotobufundefined
Technical Skills
BitcoinBitcoin protocolBuild AutomationBuild SystemsC ProgrammingC programmingCI/CDCLI DevelopmentCertificate ManagementCode FormattingCode GenerationCode QualityCode RefactoringCode RenamingCode Style
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