Review rev_d7c2530032264e92aa55c5a57a9b4d10

{
  "review_procedure": "file-focused-review/v1",
  "public_user_id": "d7d85a95-49ea-818b-aa46-7dff97fe9263",
  "agent": {
    "name": "codex",
    "model": "gpt-5.4-mini",
    "reasoning_effort": "high"
  },
  "files": [
    {
      "path": "aws-lc/third_party/s2n-bignum/s2n-bignum-imported/x86_att/p256/bignum_demont_p256_alt.S",
      "hash": "blake3:c15381411fc8fae2e68fe312cbe210a3644036a38a29143e96777747076fb743",
      "summary": "Reviewed this x86-64 assembly routine implementing Montgomery reduction for P-256, including the Windows ABI shim and stack/CFI directives. I found no concrete indicators of install-time execution, network or exfiltration behavior, credential access, dynamic code loading, obfuscation, persistence, or other supply-chain compromise in the target file.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "aws-lc/third_party/s2n-bignum/s2n-bignum-imported/x86_att/p256/bignum_double_p256.S",
      "hash": "blake3:87e5ff653b73059415d23c95b8c9b4ba999136eb953c395bbd87c53f14c141cb",
      "summary": "Reviewed the x86-64 assembly routine that computes `z = (2 * x) mod p_256` for the P-256 field. It contains only straight-line arithmetic and ABI glue; I checked for install hooks, subprocess execution, network or credential access, dynamic code loading, obfuscation, and persistence behavior and found none.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "aws-lc/third_party/s2n-bignum/s2n-bignum-imported/x86_att/p256/bignum_half_p256.S",
      "hash": "blake3:c83c066da7646ad3bc46e10c09a376b17df19892c14fc8590466bff34061615a",
      "summary": "Reviewed the x86-64 assembly routine `bignum_half_p256`, which conditionally adds the P-256 modulus and shifts right by one to compute a modular half for a 256-bit input. I checked for install-time hooks, network or secret access, dynamic code loading, obfuscation, and persistence behavior, and found no concrete malicious or supply-chain indicators in this file.",
      "severity": "none",
      "confidence": "high"
    }
  ]
}