Review rev_9c87288427e64be385b6c07eb7b6db7e

{
  "summary": "Reviewed the digest helper header `aws-lc/crypto/fipsmodule/digest/md32_common.h`, which implements generic 32-bit message-digest update/finalization routines and buffer zeroing. I checked for install-time hooks, network or exfiltration behavior, credential/secret access, dynamic code loading, obfuscation, and persistence tampering, and found no concrete malicious or supply-chain indicators.\nReviewed `aws-lc/crypto/fipsmodule/pbkdf/pbkdf_test.cc`, which contains deterministic gtest coverage for PBKDF2-HMAC behavior across empty password/salt cases, RFC 6070 vectors, SHA-2 vectors, and zero-iteration handling. I found no concrete malicious or supply-chain indicators in this file; there are no install hooks, network/exfiltration calls, credential access, dynamic code loading, obfuscation, or persistence behavior.\nReviewed the x86-64 assembly implementation of `bignum_mul_4_8_alt`, which is a straight-line big-number multiplication routine with ABI setup/teardown and carry-propagating `mulq`/`adcq` arithmetic. I checked for install hooks, 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 this x86-64 assembly routine implementing `bignum_cmul_p256_alt`, a constant-time modular multiplication for the P-256 field. I checked for install-time hooks, subprocess or loader behavior, network/exfiltration, credential access, obfuscation, and persistence mechanisms, and found no concrete malicious or supply-chain indicators in the file.\nReviewed the target AArch64 assembly file, which is an auto-derived Barrett reduction routine for ML-KEM polynomial coefficients. I checked for install-time hooks, subprocess spawning, network or exfiltration, credential access, dynamic code loading, obfuscation, persistence tampering, and other hidden payload behavior, and found no concrete malicious or supply-chain indicators.",
  "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/digest/md32_common.h",
      "hash": "blake3:5321d2c5e7c51411e4f977db06a7f4f4fb20227b24e5650c2fd4b54142b5bd4b",
      "summary": "Reviewed the digest helper header `aws-lc/crypto/fipsmodule/digest/md32_common.h`, which implements generic 32-bit message-digest update/finalization routines and buffer zeroing. I checked for install-time hooks, network or exfiltration behavior, credential/secret access, dynamic code loading, obfuscation, and persistence tampering, and found no concrete malicious or supply-chain indicators.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "aws-lc/crypto/fipsmodule/pbkdf/pbkdf_test.cc",
      "hash": "blake3:f1ba81fc08f4e0f3c6f4bc795813e1f73a4e30702c40152f678b4d717b048331",
      "summary": "Reviewed `aws-lc/crypto/fipsmodule/pbkdf/pbkdf_test.cc`, which contains deterministic gtest coverage for PBKDF2-HMAC behavior across empty password/salt cases, RFC 6070 vectors, SHA-2 vectors, and zero-iteration handling. I found no concrete malicious or supply-chain indicators in this file; there are no install hooks, network/exfiltration calls, credential access, dynamic code loading, obfuscation, or persistence behavior.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "aws-lc/third_party/s2n-bignum/s2n-bignum-imported/x86_att/fastmul/bignum_mul_4_8_alt.S",
      "hash": "blake3:88b0332e5212e02db721c638bc5d0c76b70b660dccc6b63e1a7de1cad6dd8042",
      "summary": "Reviewed the x86-64 assembly implementation of `bignum_mul_4_8_alt`, which is a straight-line big-number multiplication routine with ABI setup/teardown and carry-propagating `mulq`/`adcq` arithmetic. I checked for install hooks, 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/third_party/s2n-bignum/s2n-bignum-imported/x86_att/p256/bignum_cmul_p256_alt.S",
      "hash": "blake3:f434a15607429bfe6a9d38b01a87292c3b3f658402c0c4f84d1beed73281743f",
      "summary": "Reviewed this x86-64 assembly routine implementing `bignum_cmul_p256_alt`, a constant-time modular multiplication for the P-256 field. I checked for install-time hooks, subprocess or loader behavior, network/exfiltration, credential access, obfuscation, and persistence mechanisms, and found no concrete malicious or supply-chain indicators in the file.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "aws-lc/crypto/fipsmodule/ml_kem/mlkem/native/aarch64/src/poly_reduce_asm.S",
      "hash": "blake3:bfeb59164d6de04ea55615ea95ce6a0da9df2248668b7feffbc802aa08f5b0c1",
      "summary": "Reviewed the target AArch64 assembly file, which is an auto-derived Barrett reduction routine for ML-KEM polynomial coefficients. I checked for install-time hooks, subprocess spawning, network or exfiltration, credential access, dynamic code loading, obfuscation, persistence tampering, and other hidden payload behavior, and found no concrete malicious or supply-chain indicators.",
      "severity": "none",
      "confidence": "high"
    }
  ]
}