Review rev_f92102472c4e41d9a7c5447f0913d5b1

{
  "summary": "Reviewed the ARM assembly implementation of `bignum_optadd`, which performs a conditional limb-wise big-number add based on a mask register and returns the carry. I found no concrete indicators of install hooks, network or exfiltration behavior, credential access, dynamic code loading, obfuscation, persistence, or other supply-chain compromise in this file.\nReviewed the AArch64 assembly routine in `bignum_double_sm2.S`, which implements SM2 field doubling with a conditional subtraction of the modulus. I checked for install-time hooks, network or exfiltration behavior, credential access, dynamic code loading, obfuscation, and persistence, and found no concrete malicious or supply-chain indicators in this target file.\nReviewed this ARM assembly helper for SM2 modular halving. It performs a fixed arithmetic transform on four 64-bit words using register-only operations and stackless load/store paths; I found no concrete indicators of install-time execution, network/exfiltration, credential access, dynamic code loading, obfuscation, or persistence behavior in the target file.\nReviewed `bignum_digit.S`, a small x86-64 assembly routine that returns the n-th bignum limb in constant-time style, with ABI shims for Windows and a normal stack note section. I found no concrete malicious or supply-chain indicators in this file: no install hooks, network or exfiltration paths, credential access, dynamic code loading, obfuscation, persistence, or other hidden execution behavior.\nReviewed the top-level CMake build file for install-time execution, hidden subprocesses, network or exfiltration logic, credential access, dynamic code loading, obfuscation, and persistence tampering. It is a conventional build wrapper that adds the `aws-lc` subdirectory, defines build targets, and sets output directories; no concrete malicious or supply-chain indicators were found 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/third_party/s2n-bignum/s2n-bignum-imported/arm/generic/bignum_optadd.S",
      "hash": "blake3:179d1e7a25ce4352225792ec91ea250b4b1f61eedae344d553bc432ad62d0938",
      "summary": "Reviewed the ARM assembly implementation of `bignum_optadd`, which performs a conditional limb-wise big-number add based on a mask register and returns the carry. I found no concrete indicators of install hooks, network or exfiltration behavior, credential access, dynamic code loading, obfuscation, persistence, or other supply-chain compromise in this file.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "aws-lc/third_party/s2n-bignum/s2n-bignum-imported/arm/sm2/bignum_double_sm2.S",
      "hash": "blake3:2de2a0addbff81122e22fcdcf53e59fdce0e362351bb768445451a907a94c0c0",
      "summary": "Reviewed the AArch64 assembly routine in `bignum_double_sm2.S`, which implements SM2 field doubling with a conditional subtraction of the modulus. I checked for install-time hooks, network or exfiltration behavior, credential access, dynamic code loading, obfuscation, and persistence, and found no concrete malicious or supply-chain indicators in this target file.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "aws-lc/third_party/s2n-bignum/s2n-bignum-imported/arm/sm2/bignum_half_sm2.S",
      "hash": "blake3:d20107ba368d5dd6f90d57a6e4e0441145121a81fbdd15273f3c457b8934a372",
      "summary": "Reviewed this ARM assembly helper for SM2 modular halving. It performs a fixed arithmetic transform on four 64-bit words using register-only operations and stackless load/store paths; I found no concrete indicators of install-time execution, network/exfiltration, credential access, dynamic code loading, obfuscation, or persistence behavior in the target file.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "aws-lc/third_party/s2n-bignum/s2n-bignum-imported/x86_att/generic/bignum_digit.S",
      "hash": "blake3:10b9773a74382188a8835bee222695fd4a318f0c7b40fb06f3fb350fb23688b4",
      "summary": "Reviewed `bignum_digit.S`, a small x86-64 assembly routine that returns the n-th bignum limb in constant-time style, with ABI shims for Windows and a normal stack note section. I found no concrete malicious or supply-chain indicators in this file: no install hooks, network or exfiltration paths, credential access, dynamic code loading, obfuscation, persistence, or other hidden execution behavior.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "CMakeLists.txt",
      "hash": "blake3:b519de42718621672b0af7ec2f72727900ab156ef32464ab6845b220a3c1653f",
      "summary": "Reviewed the top-level CMake build file for install-time execution, hidden subprocesses, network or exfiltration logic, credential access, dynamic code loading, obfuscation, and persistence tampering. It is a conventional build wrapper that adds the `aws-lc` subdirectory, defines build targets, and sets output directories; no concrete malicious or supply-chain indicators were found in this file.",
      "severity": "none",
      "confidence": "high"
    }
  ]
}