Cryptology ePrint Archive: Report 2019/757

EverCrypt: A Fast, Verified, Cross-Platform Cryptographic Provider

Jonathan Protzenko and Bryan Parno and Aymeric Fromherz and Chris Hawblitzel and Marina Polubelova and Karthikeyan Bhargavan and Benjamin Beurdouche and Joonwon Choi and Antoine Delignat-Lavaud and Cedric Fournet and Natalia Kulatova and Tahina Ramananandro and Aseem Rastogi and Nikhil Swamy and Christoph Wintersteiger and Santiago Zanella-Beguelin

Abstract: We present EverCrypt: a comprehensive collection of verified, high-performance cryptographic functionalities available via a carefully designed API. The API provably supports agility (choosing between multiple algorithms for the same functionality) and multiplexing (choosing between multiple implementations of the same algorithm). Through abstraction and zero-cost generic programming, we show how agility can simplify verification without sacrificing performance, and we demonstrate how C and assembly can be composed and verified against shared specifications. We substantiate the effectiveness of these techniques with new verified implementations (including hashes, Curve25519, and AES-GCM) whose performance matches or exceeds the best unverified implementations. We validate the API design with two high-performance verified case studies built atop EverCrypt, resulting in line-rate performance for a secure network protocol and a Merkle-tree library, used in a production blockchain, that supports 2.7 million insertions/sec. Altogether, EverCrypt consists of over 124K verified lines of specs, code, and proofs, and it produces over 29K lines of C and 14K lines of assembly code.

Category / Keywords: implementation / verification, secret-key cryptography, elliptic curves

Original Publication (in the same form): Proceedings of the IEEE Symposium on Security and Privacy, 2020

Date: received 26 Jun 2019, last revised 4 Jan 2020

Contact author: parno at cmu edu

Available format(s): PDF | BibTeX Citation

Version: 20200105:012755 (All versions of this report)

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