Review rev_72d21db7df3c45fb8d1396deefb6fb2f

{
  "summary": "Reviewed `aws-lc/crypto/fipsmodule/bn/add.c`, which implements big-number addition and subtraction helpers (`BN_add`, `BN_sub`, `BN_uadd`, `BN_usub`, and word-level variants) using internal arithmetic primitives. I checked for install hooks, network or exfiltration behavior, credential access, dynamic code loading, obfuscation, persistence, and other supply-chain style payload delivery, and found no concrete malicious indicators in this file.\nReviewed the x86-64/P384 Montgomery multiplication assembly in `aws-lc/third_party/s2n-bignum/x86_att/p384/bignum_montmul_p384_alt.S`. It is a pure arithmetic routine with ABI shims, register saves/restores, modular reduction, and no concrete malicious or supply-chain indicators such as install hooks, network/exfiltration, credential access, dynamic code loading, obfuscation, or persistence behavior.\nReviewed `aws-lc/crypto/fipsmodule/bn/check_bn_tests.go`, a build-ignored Go utility that parses bn test vectors and verifies arithmetic results with `math/big`. I checked for install hooks, network/exfiltration, credential or secret access, dynamic code loading, obfuscation, and persistence behavior, and found no concrete malicious or supply-chain indicators 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/fipsmodule/bn/add.c",
      "hash": "blake3:b56808527db03c5ce238911b2e671eeb5f9c597636477955c95b86a6c065753b",
      "summary": "Reviewed `aws-lc/crypto/fipsmodule/bn/add.c`, which implements big-number addition and subtraction helpers (`BN_add`, `BN_sub`, `BN_uadd`, `BN_usub`, and word-level variants) using internal arithmetic primitives. I checked for install hooks, network or exfiltration behavior, credential access, dynamic code loading, obfuscation, persistence, and other supply-chain style payload delivery, and found no concrete malicious indicators in this file.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "aws-lc/third_party/s2n-bignum/x86_att/p384/bignum_montmul_p384_alt.S",
      "hash": "blake3:1467a9c808ebbf6674715522e2f39d0d8ffe5f1b118fa761793815d7e78e395e",
      "summary": "Reviewed the x86-64/P384 Montgomery multiplication assembly in `aws-lc/third_party/s2n-bignum/x86_att/p384/bignum_montmul_p384_alt.S`. It is a pure arithmetic routine with ABI shims, register saves/restores, modular reduction, and no concrete malicious or supply-chain indicators such as install hooks, network/exfiltration, credential access, dynamic code loading, obfuscation, or persistence behavior.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "aws-lc/crypto/fipsmodule/bn/check_bn_tests.go",
      "hash": "blake3:60608759b3a19e010ba724b933e17280a1190aa8ed6403000027e9967263207a",
      "summary": "Reviewed `aws-lc/crypto/fipsmodule/bn/check_bn_tests.go`, a build-ignored Go utility that parses bn test vectors and verifies arithmetic results with `math/big`. I checked for install hooks, network/exfiltration, credential 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"
    }
  ]
}