Review rev_51aeae308321464094c6f7ab1ebad0eb

{
  "summary": "Reviewed `aws-lc/crypto/perlasm/x86nasm.pl`, a Perl code-generation helper for emitting NASM/MASM-style assembly directives, labels, memory operands, and section setup. I checked for install-time hooks, subprocess execution, network/exfiltration, credential access, dynamic code loading, obfuscation, and persistence behavior, and found no concrete malicious or supply-chain indicators in this file.\nReviewed `aws-lc/third_party/s2n-bignum/s2n-bignum-imported/x86_att/fastmul/bignum_mul_6_12_alt.S`, an x86-64 assembly routine that multiplies two 6-limb bignums into a 12-limb result. I checked it for install hooks, network or exfiltration behavior, credential or environment access, dynamic code loading, obfuscation/deobfuscation, persistence, and other hidden payload execution, and found no concrete malicious or supply-chain indicators.\nReviewed the x86-64 assembly implementation of `bignum_sqr_p25519`, which performs Curve25519 field squaring and modular reduction with register-level arithmetic only. I checked for install-time hooks, network or exfiltration behavior, credential access, dynamic code loading, obfuscation, and persistence mechanisms, and found no concrete malicious or supply-chain indicators in this file.\nReviewed the x86-64 assembly implementation of `bignum_negmodinv`, which performs a modular inverse computation over caller-provided big integers using register-only arithmetic and normal control flow. I found no concrete indicators of install hooks, network or exfiltration behavior, credential access, dynamic code loading, obfuscation/decoding, persistence, or other supply-chain compromise signals in this target file.\nReviewed the x86-64 assembly in `bignum_sqr.S`, which implements an in-process big-number squaring routine using register setup, loops, and `mulq`/`addq` arithmetic only. I found no concrete indicators of install-time execution, network or exfiltration behavior, credential access, dynamic code loading, obfuscation, or persistence in this file.",
  "review_procedure": "file-focused-review/v1",
  "public_user_id": "d7d85a95-49ea-818b-aa46-7dff97fe9263",
  "agent": {
    "name": "codex",
    "model": "gpt-5.4-mini",
    "reasoning_effort": "medium"
  },
  "files": [
    {
      "path": "aws-lc/crypto/perlasm/x86nasm.pl",
      "hash": "blake3:08a249f3a46655c0f30e819d9e6c06aefe52ee2d2758ed160d77d9596b61baee",
      "summary": "Reviewed `aws-lc/crypto/perlasm/x86nasm.pl`, a Perl code-generation helper for emitting NASM/MASM-style assembly directives, labels, memory operands, and section setup. I checked for install-time hooks, subprocess execution, network/exfiltration, credential access, dynamic code loading, obfuscation, and persistence behavior, and found no concrete malicious or supply-chain indicators in this file.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "aws-lc/third_party/s2n-bignum/s2n-bignum-imported/x86_att/fastmul/bignum_mul_6_12_alt.S",
      "hash": "blake3:22843c8f4510caa676ac1f89e6117d1d273d0bf523e0bb08738e8f0ce7354854",
      "summary": "Reviewed `aws-lc/third_party/s2n-bignum/s2n-bignum-imported/x86_att/fastmul/bignum_mul_6_12_alt.S`, an x86-64 assembly routine that multiplies two 6-limb bignums into a 12-limb result. I checked it for install hooks, network or exfiltration behavior, credential or environment access, dynamic code loading, obfuscation/deobfuscation, persistence, and other hidden payload execution, and found no concrete malicious or supply-chain indicators.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "aws-lc/third_party/s2n-bignum/s2n-bignum-imported/x86_att/curve25519/bignum_sqr_p25519.S",
      "hash": "blake3:1456196e88c4f186a3a45b2dda98db1b46f695d4d81a970afba7349479b2fe63",
      "summary": "Reviewed the x86-64 assembly implementation of `bignum_sqr_p25519`, which performs Curve25519 field squaring and modular reduction with register-level arithmetic only. I checked for install-time hooks, network or exfiltration behavior, credential access, dynamic code loading, obfuscation, and persistence mechanisms, and found no concrete malicious or supply-chain indicators in this file.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "aws-lc/third_party/s2n-bignum/s2n-bignum-imported/x86_att/generic/bignum_negmodinv.S",
      "hash": "blake3:a9a7de025adbc2aab5cc3bb8345af5d78fea4ba6c9d23eac447c57e1c785cd3c",
      "summary": "Reviewed the x86-64 assembly implementation of `bignum_negmodinv`, which performs a modular inverse computation over caller-provided big integers using register-only arithmetic and normal control flow. I found no concrete indicators of install hooks, network or exfiltration behavior, credential access, dynamic code loading, obfuscation/decoding, persistence, or other supply-chain compromise signals in this target file.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "aws-lc/third_party/s2n-bignum/s2n-bignum-imported/x86_att/generic/bignum_sqr.S",
      "hash": "blake3:1d8d285e46a7f43e3cf4db177cb8921e6b5f26de5f043bedbdae857aa6ceef6f",
      "summary": "Reviewed the x86-64 assembly in `bignum_sqr.S`, which implements an in-process big-number squaring routine using register setup, loops, and `mulq`/`addq` arithmetic only. I found no concrete indicators of install-time execution, network or exfiltration behavior, credential access, dynamic code loading, obfuscation, or persistence in this file.",
      "severity": "none",
      "confidence": "high"
    }
  ]
}