Review rev_28029ac520524d85bbc6f48873ee86f4

{
  "summary": "Reviewed the x86-64 assembly implementation of `bignum_mul_p25519_alt`, which performs modular multiplication for Curve25519 field elements and only contains register arithmetic, ABI setup/teardown, and final stores. I checked for install-time hooks, network or exfiltration behavior, credential access, dynamic code loading, obfuscation, and persistence mechanisms, and found no concrete malicious or supply-chain indicators in this file.\nThis target file is a handwritten x86-64 assembly implementation of Montgomery squaring for secp256k1, with ABI shims and register save/restore around the arithmetic core. I checked it for install hooks, subprocess execution, network/exfiltration, credential or secret access, dynamic code loading, obfuscation, and persistence behavior, and found no concrete malicious or supply-chain indicators.\nReviewed `aws-lc/crypto/fipsmodule/ml_dsa/mldsa/rounding.h`, a constant-time C header implementing ML-DSA rounding, decomposition, hint generation, and hint application helpers. I checked for install-time execution, network or exfiltration behavior, credential access, dynamic code loading, obfuscation/packing, and persistence tampering, and found no concrete malicious or supply-chain indicators in this file.\nReviewed `aws-lc/crypto/fipsmodule/modes/gcm_test.cc`, a GCM test/ABI verification file that exercises AES-GCM vector checks and architecture-specific ABI tests. I found no concrete indicators of install hooks, network or exfiltration behavior, credential access, dynamic code loading, obfuscation, persistence tampering, or other supply-chain compromise in this target file.\nReviewed `aws-lc/crypto/asn1/tasn_utl.c`, which contains ASN.1 helper routines for selector lookup, reference counting, and cached encoding save/restore. I checked the file for install hooks, subprocess execution, network/exfiltration, credential access, dynamic code loading, obfuscation, persistence, and other supply-chain indicators, and found none.",
  "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/x86_att/curve25519/bignum_mul_p25519_alt.S",
      "hash": "blake3:38013a8d379014d563afeeb60657518d3bd2717ac006d79cb83ca36d39b8d970",
      "summary": "Reviewed the x86-64 assembly implementation of `bignum_mul_p25519_alt`, which performs modular multiplication for Curve25519 field elements and only contains register arithmetic, ABI setup/teardown, and final stores. I checked for install-time hooks, network or exfiltration behavior, credential access, dynamic code loading, obfuscation, and persistence mechanisms, 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/secp256k1/bignum_montsqr_p256k1_alt.S",
      "hash": "blake3:59c5060e8d11ddf892b219adcc5a35dab68ee4a237aa76374389c23ab82141a7",
      "summary": "This target file is a handwritten x86-64 assembly implementation of Montgomery squaring for secp256k1, with ABI shims and register save/restore around the arithmetic core. I checked it for install hooks, subprocess execution, network/exfiltration, credential or secret access, dynamic code loading, obfuscation, and persistence behavior, and found no concrete malicious or supply-chain indicators.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "aws-lc/crypto/fipsmodule/ml_dsa/mldsa/rounding.h",
      "hash": "blake3:83637fcdd439a6142ecdadfd17efcd395adea0884c9850ba80e6e735e8464f6d",
      "summary": "Reviewed `aws-lc/crypto/fipsmodule/ml_dsa/mldsa/rounding.h`, a constant-time C header implementing ML-DSA rounding, decomposition, hint generation, and hint application helpers. I checked for install-time execution, network or exfiltration behavior, credential access, dynamic code loading, obfuscation/packing, and persistence tampering, and found no concrete malicious or supply-chain indicators in this file.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "aws-lc/crypto/fipsmodule/modes/gcm_test.cc",
      "hash": "blake3:f90ab4914ac44eb02cbd4c277ef9dad376005935fdead7cd74c4ddfcfb003b72",
      "summary": "Reviewed `aws-lc/crypto/fipsmodule/modes/gcm_test.cc`, a GCM test/ABI verification file that exercises AES-GCM vector checks and architecture-specific ABI tests. I found no concrete indicators of install hooks, network or exfiltration behavior, credential access, dynamic code loading, obfuscation, persistence tampering, or other supply-chain compromise in this target file.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "aws-lc/crypto/asn1/tasn_utl.c",
      "hash": "blake3:96920dff3b72a0ac1a22ba2500b6c3ffc16dbaba075df34b6ba413338cd4a2ed",
      "summary": "Reviewed `aws-lc/crypto/asn1/tasn_utl.c`, which contains ASN.1 helper routines for selector lookup, reference counting, and cached encoding save/restore. I checked the file for install hooks, subprocess execution, network/exfiltration, credential access, dynamic code loading, obfuscation, persistence, and other supply-chain indicators, and found none.",
      "severity": "none",
      "confidence": "high"
    }
  ]
}