Review rev_9e7e55752338427dab82da3b6acb4968

{
  "summary": "Reviewed the ARM assembly implementation of `bignum_mul_4_8_alt`, which is a straight 4-limb by 4-limb big-number multiply that loads inputs, performs register-only arithmetic, and stores the 8-limb result. I checked for install hooks, network/exfiltration, credential access, dynamic code loading, obfuscation, persistence, and other hidden execution paths; none were present in this target file.\nReviewed `aws-lc/crypto/ecdsa_extra/ecdsa_asn1.c`, which only implements ECDSA signature size calculation and ASN.1 parse/marshal helpers for in-memory signature encoding. I checked for install-time hooks, network/exfiltration, credential access, dynamic code loading, obfuscation, persistence, and other hidden execution paths, and found no concrete malicious or supply-chain indicators in this file.\nReviewed `bignum_deamont_p384.S`, an ARM assembly routine that performs P-384 Montgomery deconversion and conditional subtraction of the field modulus before storing the result. I checked for install-time hooks, subprocess or syscall use, network/exfiltration, credential access, dynamic code loading, obfuscation, and persistence behavior, and found no concrete malicious or supply-chain indicators in this file.\nReviewed the x86-64/P521 modular reduction assembly in `bignum_mod_n521_9.S`, including its ABI setup, arithmetic instructions, constant usage, and ELF stack-note footer. I found no concrete indicators of install-time execution, network/exfiltration, credential access, dynamic code loading, obfuscation/deobfuscation, or persistence in this target file.\nReviewed the target x86-64 assembly routine, which implements a Montgomery-form reduction for secp256k1 using fixed constants and register arithmetic only. I found no concrete indicators of install hooks, network or exfiltration behavior, credential access, dynamic code loading, obfuscation, or persistence 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/fastmul/bignum_mul_4_8_alt.S",
      "hash": "blake3:e1215da63bb6ce6342b1e209cd5a8f2f37c4e2967c0b8dae283897ad5d649e21",
      "summary": "Reviewed the ARM assembly implementation of `bignum_mul_4_8_alt`, which is a straight 4-limb by 4-limb big-number multiply that loads inputs, performs register-only arithmetic, and stores the 8-limb result. I checked for install hooks, network/exfiltration, credential access, dynamic code loading, obfuscation, persistence, and other hidden execution paths; none were present in this target file.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "aws-lc/crypto/ecdsa_extra/ecdsa_asn1.c",
      "hash": "blake3:7c0f9cf179bac170b6673da5a5839ef423809e7d32fc1ee0265dd4c437ac0f4a",
      "summary": "Reviewed `aws-lc/crypto/ecdsa_extra/ecdsa_asn1.c`, which only implements ECDSA signature size calculation and ASN.1 parse/marshal helpers for in-memory signature encoding. I checked for install-time hooks, network/exfiltration, credential access, dynamic code loading, obfuscation, persistence, and other hidden execution paths, and found no concrete malicious or supply-chain indicators in this file.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "aws-lc/third_party/s2n-bignum/s2n-bignum-imported/arm/p384/bignum_deamont_p384.S",
      "hash": "blake3:8e053e2a128aa560ceba1183251efcc9f1cdd15c4ac47c3729a9912d6fa71988",
      "summary": "Reviewed `bignum_deamont_p384.S`, an ARM assembly routine that performs P-384 Montgomery deconversion and conditional subtraction of the field modulus before storing the result. I checked for install-time hooks, subprocess or syscall use, network/exfiltration, credential access, dynamic code loading, obfuscation, and persistence behavior, and found no concrete malicious or supply-chain indicators in this file.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "aws-lc/third_party/s2n-bignum/s2n-bignum-imported/x86_att/p521/bignum_mod_n521_9.S",
      "hash": "blake3:fe2bb1be5de6107010bc1f7d8a2501e053d0876d076d01782d29581a105a092d",
      "summary": "Reviewed the x86-64/P521 modular reduction assembly in `bignum_mod_n521_9.S`, including its ABI setup, arithmetic instructions, constant usage, and ELF stack-note footer. I found no concrete indicators of install-time execution, network/exfiltration, credential access, dynamic code loading, obfuscation/deobfuscation, or persistence in this target file.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "aws-lc/third_party/s2n-bignum/s2n-bignum-imported/x86_att/secp256k1/bignum_deamont_p256k1.S",
      "hash": "blake3:f54689714bc9ac864eae6dbdb55155de0da4b5a006373e45a4c8c793c320d3db",
      "summary": "Reviewed the target x86-64 assembly routine, which implements a Montgomery-form reduction for secp256k1 using fixed constants and register arithmetic only. I found no concrete indicators of install hooks, network or exfiltration behavior, credential access, dynamic code loading, obfuscation, or persistence in this file.",
      "severity": "none",
      "confidence": "high"
    }
  ]
}