Repository Analysis

zhlynn/zsign

Fast Cross-Platform iOS Code Signing Tool

2.8 Likely human-written View on GitHub

Analysis Overview

This report presents the forensic synthetic code analysis of zhlynn/zsign, a C++ project with 1,810 GitHub stars. SynthScan v2.0 examined 41,979 lines of code across 76 source files, recording 99 pattern matches distributed across 2 syntactic categories. The overall adjusted score of 2.8 places this repository in the Likely human-written band.

The scanner applied 160+ deterministic lexical heuristics, multi-line block detectors, abstract syntax tree depth profilers, and a cross-file Jaccard similarity matrix to construct a statistically normalised synthetic code estimate. All matches are individually weighted by severity coefficient and contextual multiplier before summation, and the resulting headline score is temporally discounted to account for the repository's development history relative to the commercial emergence of large language model coding tooling (November 2022 onward).

2.8
Adjusted Score
2.8
Raw Score
100%
Time Factor
2026-07-14
Last Push
1.8K
Stars
C++
Language
42.0K
Lines of Code
76
Files
99
Pattern Hits
2026-07-14
Scan Date
0.00
HC Hit Rate

What These Metrics Mean

Adjusted Score
Primary synthetic code indicator. Raw score normalised per 1,000 lines of code and multiplied by the temporal discount factor. This is the definitive comparative metric — use it to rank repositories by AI authorship density.
Raw Score
The unmodified sum of all severity-weighted, context-multiplied pattern match scores before temporal discounting. Reflects the absolute signal strength independent of when the repository was last active.
Time Factor
The temporal discount multiplier (0–100%) applied to the raw score. Repositories last updated before ChatGPT's launch (Nov 2022) receive a 5% factor. Full signal is only assigned to repositories active in the post-adoption era (Jan 2024+).
Pattern Hits
Total count of individual pattern matches across all files and categories. A high hit count with a low score may indicate a very large codebase with isolated AI snippets; a low count with a high score indicates dense, concentrated AI signatures.
HC Hit Rate
High+Critical pattern hits per file, averaged across the repository. This orthogonal signal catches repositories where a few files are densely packed with high-severity AI tells — a strong indicator even when the normalised score appears moderate due to codebase size.
Lines of Code / Files
Total lines and files analysed. The scanner examines 94 file extensions. These denominators are used to normalise the score, enabling fair comparison between repositories of vastly different sizes.

Score History

This chart maps the temporal evolution of the adjusted synthetic code score across successive scan runs. An upward trajectory indicates ongoing incorporation of AI-generated code or expanding LLM-assisted scaffolding; a stable or declining trajectory may reflect active human refactoring, code removal, or the adoption of stricter authorship policies. The dashed secondary line (right axis) independently tracks total raw pattern hit count, which can diverge from the normalised score when codebase size changes significantly between scans.

Severity Breakdown

Classifies detected patterns by their diagnostic confidence and structural impact. CRITICAL patterns (coefficient 10) represent definitive synthetic signatures — hallucinated imports, explicit LLM attribution metadata — virtually never produced by human authors. HIGH (5) indicates strong structural tells such as cross-file repetition or cross-linguistic idioms. MEDIUM (2) covers recognisable conversational padding and AI-specific vocabulary. LOW (1) captures subtle indicators like tautological comments and generic boilerplate that require density to carry independent signal.

CRITICAL 0HIGH 0MEDIUM 11LOW 88

Directory Score Breakdown

This horizontal bar chart decomposes the repository's raw synthetic code score by top-level directory, allowing you to pinpoint precisely which modules or components carry the highest AI authorship density. Directories with disproportionately high scores relative to their size warrant targeted manual review: concentrated AI signatures often trace back to mass-generated configuration layers, auto-ported test suites, LLM-scaffolded boilerplate classes, or entire subsystems authored under heavy copilot assistance. Use this view to prioritise your human code-review effort.

Pattern Findings

The scanner identified 99 distinct pattern matches across 2 syntactic categories. Each entry below represents a discrete location in the source code where the engine recorded a statistically significant AI authorship indicator. Expand any category row to inspect the individual file paths, line numbers, code snippets, and the lexical context (CODE, COMMENT, or STRING) in which each match was detected.

Reading the findings table: The Severity column indicates the diagnostic confidence level (CRITICAL / HIGH / MEDIUM / LOW). The Context column identifies whether the match occurred inside executable code, an inline comment, or a string literal — comment-context matches receive a ×1.5 weight because LLMs systematically over-annotate. The ⚡ bolt icon marks clustered matches: three or more patterns within a 10-line window, each receiving an additional ×1.5 density multiplier as dense clusters constitute far stronger evidence of synthetic authorship than isolated hits.

Over-Commented Block88 hits · 86 pts
SeverityFileLineSnippetContext
LOWsrc/certcheck.h1#pragma onceCOMMENT
LOWsrc/zsign.cpp1#include "common.h"COMMENT
LOWsrc/certcheck.cpp1#include "common.h"COMMENT
LOWsrc/certcheck.cpp21#include <openssl/cms.h>COMMENT
LOWsrc/signing.cpp681COMMENT
LOWsrc/common/common.h1#pragma onceCOMMENT
LOWsrc/common/common.h21COMMENT
LOWsrc/common/common.h41#include <memory>COMMENT
LOWsrc/common/mach-o.h21#define CPU_TYPE_I386 CPU_TYPE_X86 /* compatibility */COMMENT
LOWsrc/common/mach-o.h61#define CPU_SUBTYPE_BIG_ENDIAN 1COMMENT
LOWsrc/common/mach-o.h81#define CPU_SUBTYPE_PENTIUM_3_M CPU_SUBTYPE_INTEL(8, 1)COMMENT
LOWsrc/common/mach-o.h101#define CPU_SUBTYPE_X86_ALL 3COMMENT
LOWsrc/common/mach-o.h121#define CPU_SUBTYPE_ARM_V7M 15COMMENT
LOWsrc/common/mach-o.h141#define MH_OBJECT 0x1 /* relocatable object file */COMMENT
LOWsrc/common/mach-o.h161#define MH_TWOLEVEL 0x00000080COMMENT
LOWsrc/common/mach-o.h181COMMENT
LOWsrc/common/mach-o.h201#define LC_SUB_UMBRELLA 0x00000013COMMENT
LOWsrc/common/mach-o.h221#define LC_FUNCTION_STARTS 0x00000026COMMENT
LOWsrc/common/mach-o.h241 in it and nothing relocated to it, that isCOMMENT
LOWsrc/common/mach-o.h261#define S_MOD_INIT_FUNC_POINTERS 0x09COMMENT
LOWsrc/common/json.cpp1#include "json.h"COMMENT
LOWsrc/common/archive.cpp1#include "archive.h"COMMENT
LOWsrc/third-party/minizip/unzip.c61COMMENT
LOWsrc/third-party/minizip/unzip.c81#ifdef NO_ERRNO_HCOMMENT
LOWsrc/third-party/minizip/unzip.c101#ifndef UNZ_BUFSIZECOMMENT
LOWsrc/third-party/minizip/zip.c21COMMENT
LOWsrc/third-party/minizip/zip.c41COMMENT
LOWsrc/third-party/minizip/zip.c61# define ALLOC(size) (malloc(size))COMMENT
LOWsrc/third-party/minizip/zip.c81#endifCOMMENT
LOWsrc/third-party/minizip/zip.h41#define _zip12_HCOMMENT
LOWsrc/third-party/minizip/zip.h61#define Z_BZIP2ED 12COMMENT
LOWsrc/third-party/minizip/unzip.h41*/COMMENT
LOWsrc/third-party/minizip/unzip.h61COMMENT
LOWsrc/third-party/minizip/ioapi.h21#ifndef _ZLIBIOAPI64_HCOMMENT
LOWsrc/third-party/minizip/ioapi.h41 #ifndef _LARGEFILE64_SOURCECOMMENT
LOWsrc/third-party/minizip/ioapi.h61#define ftello64 ftelloCOMMENT
LOWsrc/third-party/minizip/ioapi.h81 #include <stdint.h>COMMENT
LOWsrc/third-party/minizip/ioapi.h101COMMENT
LOWsrc/third-party/minizip/ioapi.h121#define ZLIB_FILEFUNC_SEEK_END (2)COMMENT
LOWsrc/third-party/minizip/iowin32.c21#define INVALID_HANDLE_VALUE (0xFFFFFFFF)COMMENT
LOWsrc/third-party/zlib/zutil.h21COMMENT
LOWsrc/third-party/zlib/zutil.h41typedef unsigned short ush;COMMENT
LOWsrc/third-party/zlib/zutil.h61#define ERR_RETURN(strm,err) \COMMENT
LOWsrc/third-party/zlib/zutil.h101# include <alloc.h>COMMENT
LOWsrc/third-party/zlib/zutil.h121# define OS_CODE 4COMMENT
LOWsrc/third-party/zlib/zutil.h141# define OS_CODE 7COMMENT
LOWsrc/third-party/zlib/zutil.h181# define OS_CODE 3 /* assume Unix */COMMENT
LOWsrc/third-party/zlib/zutil.h201# define HAVE_MEMCPYCOMMENT
LOWsrc/third-party/zlib/zutil.h221# include <stdio.h>COMMENT
LOWsrc/third-party/zlib/crc32.c81# elseCOMMENT
LOWsrc/third-party/zlib/crc32.c801 crc0 = crc_braid_table[0][word0 & 0xff];COMMENT
LOWsrc/third-party/zlib/zutil.c61#endifCOMMENT
LOWsrc/third-party/zlib/zutil.c81#endifCOMMENT
LOWsrc/third-party/zlib/zutil.c101# ifdef NO_snprintfCOMMENT
LOWsrc/third-party/zlib/gzguts.h1/* gzguts.h -- zlib internal header definitions for gz* operationsCOMMENT
LOWsrc/third-party/zlib/gzguts.h21#include "zlib.h"COMMENT
LOWsrc/third-party/zlib/gzguts.h41#endifCOMMENT
LOWsrc/third-party/zlib/gzguts.h61# endifCOMMENT
LOWsrc/third-party/zlib/gzguts.h81# endifCOMMENT
LOWsrc/third-party/zlib/gzguts.h101# endifCOMMENT
28 more matches not shown…
Decorative Section Separators11 hits · 33 pts
SeverityFileLineSnippetContext
MEDIUMsrc/certcheck.cpp41// ─── helpers ───────────────────────────────────────────────────────COMMENT
MEDIUMsrc/certcheck.cpp128// ─── issuer resolution ──────────────────────────────────────────────COMMENT
MEDIUMsrc/certcheck.cpp169// ─── file type detection ────────────────────────────────────────────COMMENT
MEDIUMsrc/certcheck.cpp221// ─── cert extraction ────────────────────────────────────────────────COMMENT
MEDIUMsrc/certcheck.cpp290// ─── Leaf cert from CMS ─────────────────────────────────────────────COMMENT
MEDIUMsrc/certcheck.cpp322// ─── Mach-O cert extraction ─────────────────────────────────────────COMMENT
MEDIUMsrc/certcheck.cpp352// ─── Read from zip (no extraction) ──────────────────────────────────COMMENT
MEDIUMsrc/certcheck.cpp416// ─── OCSP check ─────────────────────────────────────────────────────COMMENT
MEDIUMsrc/certcheck.cpp593// ─── display (simple text, matches zsign style) ──────────────────────COMMENT
MEDIUMsrc/certcheck.cpp652// ─── main entry ─────────────────────────────────────────────────────COMMENT
MEDIUMsrc/certcheck.cpp746// ─── Post-sign binary check ─────────────────────────────────────────COMMENT