Review rev_4c656a0b688449349c339fb18042a8c6

{
  "summary": "Reviewed the Rust source list in `builder/cc_builder/linux_x86_64.rs`, which is a static inventory of Linux x86_64 assembly files used for the build. I checked for install hooks, network or exfiltration logic, credential or secret access, dynamic code loading, obfuscation, and persistence behavior, and found no concrete malicious or supply-chain indicators in this target file.\nReviewed `aws-lc/crypto/asn1/f_string.c`, which contains a small ASN.1 string formatting helper that hex-encodes `ASN1_STRING` bytes to a `BIO`. I checked for install hooks, network or exfiltration behavior, credential or environment access, dynamic code loading, obfuscation/decoding pipelines, and persistence mechanisms, and found no concrete malicious or supply-chain indicators in this file.\nReviewed this C header declaring KEM method/key structures and raw key setter APIs in `aws-lc/crypto/fipsmodule/kem/internal.h`. I found no concrete malicious or supply-chain indicators in the target file: there are no install hooks, network/exfiltration logic, credential access, dynamic code loading, obfuscation, or persistence behavior, only type declarations and function prototypes.\nReviewed `aws-lc/crypto/x509/a_digest.c`, which only defines two ASN.1-to-DER digest helper functions that allocate a temporary buffer, serialize input, hash it with `EVP_Digest`, and free the buffer. I found no concrete indicators of install hooks, network/exfiltration, credential access, dynamic code loading, obfuscation, persistence, or other supply-chain malicious behavior in this target file.\nReviewed the ARM assembly implementation of modular addition for the P-521 field; it is a straight-line arithmetic routine with fixed loads, carry handling, conditional reduction, and stores only. I found no concrete indicators of install-time execution, network or exfiltration, credential access, dynamic code loading, obfuscation, or persistence behavior in this target 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": "builder/cc_builder/linux_x86_64.rs",
      "hash": "blake3:17d7cca68b4a2fba5ad3f01dd1beb1d5f574524ddf23f192d98c06ceac99dadd",
      "summary": "Reviewed the Rust source list in `builder/cc_builder/linux_x86_64.rs`, which is a static inventory of Linux x86_64 assembly files used for the build. I checked for install hooks, network or exfiltration logic, credential or secret access, dynamic code loading, obfuscation, and persistence behavior, and found no concrete malicious or supply-chain indicators in this target file.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "aws-lc/crypto/asn1/f_string.c",
      "hash": "blake3:8edc9bc9b754e1e1f781171cbb1682d2d11b399fef773bc85e75c4449a8f16d6",
      "summary": "Reviewed `aws-lc/crypto/asn1/f_string.c`, which contains a small ASN.1 string formatting helper that hex-encodes `ASN1_STRING` bytes to a `BIO`. I checked for install hooks, network or exfiltration behavior, credential or environment access, dynamic code loading, obfuscation/decoding pipelines, and persistence mechanisms, and found no concrete malicious or supply-chain indicators in this file.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "aws-lc/crypto/fipsmodule/kem/internal.h",
      "hash": "blake3:71ec3b0dc1d5065fdb5584e2effc36dd1b895d53e7cc67fa9d99104bf6d9e24a",
      "summary": "Reviewed this C header declaring KEM method/key structures and raw key setter APIs in `aws-lc/crypto/fipsmodule/kem/internal.h`. I found no concrete malicious or supply-chain indicators in the target file: there are no install hooks, network/exfiltration logic, credential access, dynamic code loading, obfuscation, or persistence behavior, only type declarations and function prototypes.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "aws-lc/crypto/x509/a_digest.c",
      "hash": "blake3:bd7bf95fb476a7bf117adc7042153cf01efb0267f096f56eb7a3939ea895a76f",
      "summary": "Reviewed `aws-lc/crypto/x509/a_digest.c`, which only defines two ASN.1-to-DER digest helper functions that allocate a temporary buffer, serialize input, hash it with `EVP_Digest`, and free the buffer. I found no concrete indicators of install hooks, network/exfiltration, credential access, dynamic code loading, obfuscation, persistence, or other supply-chain malicious behavior in this target file.",
      "severity": "none",
      "confidence": "high"
    },
    {
      "path": "aws-lc/third_party/s2n-bignum/arm/p521/bignum_add_p521.S",
      "hash": "blake3:4cb5a54b3f64dacab3a7305b1e03dd727beb04eb8725921616d0e213a0596375",
      "summary": "Reviewed the ARM assembly implementation of modular addition for the P-521 field; it is a straight-line arithmetic routine with fixed loads, carry handling, conditional reduction, and stores only. I found no concrete indicators of install-time execution, network or exfiltration, credential access, dynamic code loading, obfuscation, or persistence behavior in this target file.",
      "severity": "none",
      "confidence": "high"
    }
  ]
}