Review rev_e3edd807c1e24effa1f0a77cc7aa6f6b

{
  "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/x86_att/p521/bignum_optneg_p521.S",
      "hash": "blake3:08a7e43b742f6ffc27b3179f4e2b674fd4b525d40495a8b84dfebcef18b7347c",
      "summary": "Reviewed the x86-64 assembly routine in `bignum_optneg_p521.S`; it only performs a conditional modular negation of a 9-limb P-521 value, with ABI shims for Windows/Linux and no install hooks, network/exfiltration, secret access, dynamic code loading, obfuscation, or persistence behavior present in the file.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "aws-lc/third_party/s2n-bignum/x86_att/p521/bignum_sqr_p521.S",
      "hash": "blake3:c6106e1cc9e894ba061ddf171eb44edb4f17b471b6495b4aa71051f1ef19d4f5",
      "summary": "This file is a hand-written x86-64 assembly routine that computes modular squaring for p521 (`bignum_sqr_p521`) and only performs register/stack arithmetic plus ABI save/restore. I checked it for install-time execution, subprocesses, network or exfiltration behavior, credential or secret access, dynamic code loading, obfuscation, and persistence, and found no concrete malicious or supply-chain indicators.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "aws-lc/third_party/s2n-bignum/x86_att/p521/bignum_sqr_p521_alt.S",
      "hash": "blake3:4867738a76783f1a4d894855b3c37b7da987b1609ed004eec4aa0c0638c91398",
      "summary": "Reviewed the x86-64 assembly in `aws-lc/third_party/s2n-bignum/x86_att/p521/bignum_sqr_p521_alt.S`, which implements fixed modular squaring for the P-521 field and restores registers before returning. I found no concrete indicators of install-time execution, network/exfiltration, credential access, dynamic code loading, obfuscation, or persistence in this file.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "aws-lc/third_party/s2n-bignum/x86_att/p521/bignum_sub_p521.S",
      "hash": "blake3:d4b4dba9b15db9396dbc0a99807b2f6780a7c41015253f02f2142d6bbe402490",
      "summary": "Reviewed the x86-64 assembly implementation of `bignum_sub_p521`, which performs a fixed modular subtraction for the P-521 field with ABI register handling and register save/restore. I checked for install-time execution, subprocess launch, network or exfiltration behavior, credential access, dynamic code loading, obfuscation, persistence tampering, and other hidden payload indicators; none were present.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "aws-lc/third_party/s2n-bignum/x86_att/p521/bignum_tolebytes_p521.S",
      "hash": "blake3:8759992c4aca614db4867a36809586bcf588b795e3bad386be4a179beb94aa31",
      "summary": "Reviewed the x86-64 assembly implementation of `bignum_tolebytes_p521`, which only copies a 9-limb bignum into a 66-byte little-endian output buffer, with a small Windows ABI register shuffle and no external control flow. I checked for install-time hooks, network or credential access, dynamic code loading, obfuscation, persistence, and other payload-like behavior, and found no concrete malicious or supply-chain indicators.",
      "severity": "none",
      "confidence": "high"
    }
  ]
}