Review rev_829bf0eb0df6458c8290639ac1fa0e14

{
  "summary": "Reviewed this Go source file implementing an HMAC-DRBG (SHA-256) with init, reseed, and generate routines. I checked for install hooks, network or exfiltration, credential access, dynamic code loading, obfuscation, and persistence behavior, and found no concrete malicious or supply-chain indicators in the file.\n`aws-lc/util/fipstools/break-kat.go` is a small CLI that reads a binary, searches for a known-answer-test byte sequence, zeroes it out, and writes the modified binary to stdout. I checked for install hooks, network/exfiltration, credential or secret access, dynamic code loading, obfuscation, persistence tampering, and hidden subprocess behavior, and found no concrete malicious or supply-chain indicators in this file.\nReviewed `aws-lc/crypto/buf/buf_test.cc`, which is a unit test exercising `BUF_MEM` reserve/grow/append behavior and validating length, contents, and zeroing semantics. I found no concrete indicators of install hooks, network/exfiltration, credential access, dynamic code loading, obfuscation, persistence, or other supply-chain compromise behavior in this file.\nReviewed `aws-lc/crypto/x509/x_attrib.c`, a small X.509 ASN.1 helper that defines the `X509_ATTRIBUTE` structure and a constructor using `OBJ_nid2obj`, `X509_ATTRIBUTE_new`, `ASN1_TYPE_new`, and `ASN1_TYPE_set`. I found no concrete indicators of install hooks, network or exfiltration behavior, credential access, dynamic code loading, obfuscation, or persistence in this file.\nReviewed `aws-lc/include/openssl/cmac.h`, which is a C/C++ public header that only declares CMAC APIs, context management functions, and a deleter macro for C++ users. I checked for install-time hooks, network or exfiltration paths, credential 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/util/fipstools/acvp/acvptool/testmodulewrapper/hmac_drbg.go",
      "hash": "blake3:c141a77bbb85deaf78210eab0a3e57d6bcb3002cfe5353460d15fdc60222f520",
      "summary": "Reviewed this Go source file implementing an HMAC-DRBG (SHA-256) with init, reseed, and generate routines. I checked for install hooks, network or exfiltration, credential access, dynamic code loading, obfuscation, and persistence behavior, and found no concrete malicious or supply-chain indicators in the file.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "aws-lc/util/fipstools/break-kat.go",
      "hash": "blake3:03fcd1281597989a4cf7717110519bfc343e8bd1fb89720c8fdb20c74c1d101f",
      "summary": "`aws-lc/util/fipstools/break-kat.go` is a small CLI that reads a binary, searches for a known-answer-test byte sequence, zeroes it out, and writes the modified binary to stdout. I checked for install hooks, network/exfiltration, credential or secret access, dynamic code loading, obfuscation, persistence tampering, and hidden subprocess behavior, and found no concrete malicious or supply-chain indicators in this file.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "aws-lc/crypto/buf/buf_test.cc",
      "hash": "blake3:46373d15a041605710b2ace683a04ac53106bd0037ab14bd91118e023c2dbe1e",
      "summary": "Reviewed `aws-lc/crypto/buf/buf_test.cc`, which is a unit test exercising `BUF_MEM` reserve/grow/append behavior and validating length, contents, and zeroing semantics. I found no concrete indicators of install hooks, network/exfiltration, credential access, dynamic code loading, obfuscation, persistence, or other supply-chain compromise behavior in this file.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "aws-lc/crypto/x509/x_attrib.c",
      "hash": "blake3:d5f416edc384e018c841c17733dbcc3b3bed429bc2742280c4c08421b5b99598",
      "summary": "Reviewed `aws-lc/crypto/x509/x_attrib.c`, a small X.509 ASN.1 helper that defines the `X509_ATTRIBUTE` structure and a constructor using `OBJ_nid2obj`, `X509_ATTRIBUTE_new`, `ASN1_TYPE_new`, and `ASN1_TYPE_set`. 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"
    },
    {
      "path": "aws-lc/include/openssl/cmac.h",
      "hash": "blake3:10cc30bfc7d26d5954e95b0242c54b685218e609ae57e189b144be7408ff5219",
      "summary": "Reviewed `aws-lc/include/openssl/cmac.h`, which is a C/C++ public header that only declares CMAC APIs, context management functions, and a deleter macro for C++ users. I checked for install-time hooks, network or exfiltration paths, 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"
    }
  ]
}