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A Verified, Efficient Embedding of a Verifiable Assembly Language

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Journal Article - Open Access

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Carnegie Mellon University Pittsburgh United States

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High-performance cryptographic libraries often mix code written in a high-level language with code written in assembly. To support formally verifying the correctness and security of such hybrid programs, this paper presents an embedding of a subset of x64 assembly language in F that allows efficient verification of both assembly and its interoperation with C code generated from F. The key idea is to use the computational power of a dependent type systems type checker to run a verified verification-condition generator during type checking. This allows the embedding to customize the verification condition sent by the type checker to an SMT solver. By combining our proof-by-reflection style with SMT solving, we demonstrate improved automation for proving the correctness of assembly-language code. This approach has allowed us to complete the first-ever proof of correctness of an optimized implementation of AES-GCM, a cryptographic routine used by 90 of secure Internet traffic.

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  • Computer Programming and Software

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