{"id":557169,"date":"2018-12-14T08:59:06","date_gmt":"2018-12-14T16:59:06","guid":{"rendered":"https:\/\/www.microsoft.com\/en-us\/research\/?post_type=msr-research-item&#038;p=557169"},"modified":"2018-12-14T08:59:06","modified_gmt":"2018-12-14T16:59:06","slug":"a-verified-efficient-embedding-of-a-verifiable-assembly-language","status":"publish","type":"msr-research-item","link":"https:\/\/www.microsoft.com\/en-us\/research\/publication\/a-verified-efficient-embedding-of-a-verifiable-assembly-language\/","title":{"rendered":"A Verified, Efficient Embedding of a Verifiable Assembly Language"},"content":{"rendered":"<p><span>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 system\u2019s 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.<br \/>\n<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>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 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