Doug Engert
Retired at Home
City of Rochester, New York, United States
Summary
🤩
RockstarDoug Engert is a retired software engineer with 11 years of hands-on experience specializing in smart card security, PKCS#11, and low-level cryptographic engineering. Based in Rochester, NY, he made significant open-source contributions to the well-known OpenSC project and its libp11 PKCS#11 wrapper, improving ECDSA/ECDH support, OpenSSL compatibility, and fixing cryptographic vulnerabilities. His work demonstrates deep familiarity with token middleware, certificate and key handling, and robust error management in security-critical code. Even in retirement he retains practical expertise in debugging subtle reference-count and interoperability issues across crypto stacks. Colleagues would describe him as a meticulous backend developer who favors correctness and resilience in cryptographic systems.
11 years of coding experience
Github Skills (11)
c1710
ecdsa10
ec10
smartcard10
pkcs10
c1110
openssl10
cryptography10
security10
apidoc9
api9
Programming languages (8)
Github contributions (5)
OpenSC/OpenSC
Aug 2014 - Dec 2022
Open source smart card tools and middleware. PKCS#11/MiniDriver/Tokend
Role in this project:
Back-end Developer & Security Engineer
Back-end Developer & Security EngineerContributions:300 reviews, 145 commits, 153 PRs in 8 years 4 months
Contributions summary:Doug made significant contributions to the OpenSC project, primarily focused on enhancing and securing smart card tools. Their work involved fixing cryptographic vulnerabilities, modifying the `pkcs11-tool` to support ECDH operations for better compatibility with various PKCS#11 implementations, and improving the PIV driver's handling of card resets and user authentication. The contributions show expertise in PKCS#11, smart card security, and low-level cryptographic operations. The user also added fixes for various issues related to the handling of keys and certificates.
pkcs11golangsmartcardsecuritytokend
OpenSC/libp11
Dec 2014 - Aug 2022
PKCS#11 wrapper library
Role in this project:Back-end Developer
Back-end DeveloperContributions:9 reviews, 25 commits, 19 PRs in 7 years 8 months
Contributions summary:Doug primarily worked on the `libp11` library, a PKCS#11 wrapper. Their contributions included fixing issues related to ECDSA and OpenSSL, specifically addressing reference count problems and integrating ECDSA functionality. They also improved the handling of certificate attributes and made adjustments to include and update pkcs11.h to match the OpenSC version. Furthermore, they refactored code related to ECDH derive and OpenSSL 1.1 compatibility, adding more robust error handling.
pkcs11cryptographyhsmtpmwrapper-library
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