Review rev_207310206f5a46b59bd0bd9aab5d4195

{
  "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_double_p521.S",
      "hash": "blake3:98dedc71bbbac29129d36848fa57e43999883a21bc2e83cc522a58499e453ede",
      "summary": "Reviewed the x86-64 assembly routine that doubles a reduced P-521 field element modulo p_521, including the Windows ABI register shims and the final stack-note directive. It only performs limb arithmetic and register preservation; I found no install hooks, network or secret access, dynamic code loading, obfuscation, persistence, or other supply-chain indicators in this file.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "aws-lc/third_party/s2n-bignum/x86_att/p521/bignum_fromlebytes_p521.S",
      "hash": "blake3:73d66553fbc86fe735cc3cb3ed37503948ce06ecab573a10d4a7440dbab5791c",
      "summary": "Reviewed the x86-64 assembly routine in `bignum_fromlebytes_p521.S`, which simply copies a 66-byte little-endian input buffer into nine 64-bit output limbs, with a Windows ABI register shuffle and no other side effects. I checked for install-time hooks, network or secret access, dynamic code loading, obfuscation, persistence tampering, and hidden subprocess execution, and found no concrete malicious or supply-chain indicators.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "aws-lc/third_party/s2n-bignum/x86_att/p521/bignum_half_p521.S",
      "hash": "blake3:dacaee10f03ccb0b5d9af2e067fc0c12cdb12c3ef70de9f187cf38c28c73884c",
      "summary": "Reviewed the x86-64 assembly implementation of `bignum_half_p521`, which performs a one-bit right rotation to compute `(x / 2) mod p_521` across nine 64-bit limbs under standard and Windows ABIs. I found no concrete indicators of install-time execution, network or credential access, dynamic code loading, obfuscation, persistence, or other supply-chain malicious behavior in this file.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "aws-lc/third_party/s2n-bignum/x86_att/p521/bignum_mod_n521_9.S",
      "hash": "blake3:5fab745fbb0442b5fcf8cb17391479a5fa1147140b1378f57cb4157919c07d98",
      "summary": "Reviewed the P-521 modular reduction assembly in aws-lc/third_party/s2n-bignum/x86_att/p521/bignum_mod_n521_9.S. The file is a self-contained arithmetic routine that only manipulates registers and the caller-provided buffers; I found no concrete indicators of install-time execution, network or exfiltration behavior, credential access, dynamic code loading, obfuscation, persistence, or other payload-like activity.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "aws-lc/third_party/s2n-bignum/x86_att/p521/bignum_mod_n521_9_alt.S",
      "hash": "blake3:4919a91057f0f7a155dda2db5e2d60609ae9853af0cfa8ecd4b6b43042070915",
      "summary": "Reviewed this x86-64 assembly implementation of P-521 modular reduction in `bignum_mod_n521_9_alt.S`. It performs fixed arithmetic with ABI handling and a GNU-stack note, and I found no concrete indicators of install-time execution, network/exfiltration, credential access, dynamic code loading, obfuscation, or persistence in the target file.",
      "severity": "none",
      "confidence": "high"
    }
  ]
}