Review rev_dbc874b55dee493081d4a7244e478e75

{
  "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/generic/bignum_cld.S",
      "hash": "blake3:3931d5d95755a3edfcbf9ce41e976affe8b937b70c1227cc1f2747a94862186d",
      "summary": "Reviewed the x86-64 assembly implementation of `bignum_cld`, which counts leading zero 64-bit words in an input bignum and returns the count. I checked for install-time execution, network or exfiltration, credential access, dynamic code loading, obfuscation, persistence, and other payload-like behavior; none are present in this file.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "aws-lc/third_party/s2n-bignum/s2n-bignum-imported/x86_att/generic/bignum_clz.S",
      "hash": "blake3:fa1c04400e58f8aff760b6a168eab08e03979e6c921e6237e3da77ea1597d500",
      "summary": "Reviewed the x86-64 assembly implementation of `bignum_clz`, which counts leading zero bits across a big integer word array and handles the zero-length/zero-value cases with straight-line arithmetic and branchless selection. I checked for install-time hooks, network or credential access, dynamic code loading, obfuscation, persistence tampering, and other hidden execution paths, and found none in this file.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "aws-lc/third_party/s2n-bignum/s2n-bignum-imported/x86_att/generic/bignum_cmadd.S",
      "hash": "blake3:9eeca8327090bd756753bf90413d6b06bb1c38c6b3c73c63fd88d168ddd1a594",
      "summary": "Reviewed `bignum_cmadd.S`, an x86-64 assembly routine for big-number multiply-add with carry and ABI setup for Unix/Windows. I found no concrete malicious or supply-chain indicators in this file: there are no install hooks, network or exfiltration paths, credential access, dynamic code loading, obfuscation, persistence, or hidden subprocess execution.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "aws-lc/third_party/s2n-bignum/s2n-bignum-imported/x86_att/generic/bignum_cmnegadd.S",
      "hash": "blake3:1b34e78d4910b521015b769960c591058fc1e69cdd94284281668fe7569d58ac",
      "summary": "Reviewed the x86-64 assembly routine `bignum_cmnegadd`, which performs a bounded big-number multiply-subtract on caller-provided buffers and returns the carry word. I checked the file for install-time execution, network or exfiltration behavior, credential access, dynamic code loading, obfuscation, and persistence tampering, 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/generic/bignum_cmod.S",
      "hash": "blake3:3562ceb52030df58e9f6c1fe3659181fe578ea70d0d314bdb92512e2c0320176",
      "summary": "Reviewed the x86-64 assembly routine `bignum_cmod`, which performs modular reduction over a big-number limb array with ABI setup and arithmetic loops. I checked this file for install hooks, subprocess or network activity, credential or environment access, dynamic code loading, obfuscation, persistence, and other hidden payload indicators; none were present.",
      "severity": "none",
      "confidence": "high"
    }
  ]
}