feat: initial commit - Azure Trusted Signing automation script

- sign-app.ps1: PowerShell signing script using signtool.exe + Trusted Signing dlib
- README.md: comprehensive setup and usage documentation
- metadata.template.json: signing metadata template (no secrets)
- Service Principal auth: AZURE_CLIENT_ID/SECRET/TENANT_ID via EnvironmentCredential

.gitignore

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+# Sensitive / local files
+*.json
+!metadata.template.json
+TrustedSigningClient/
+*.log

README.md

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+# 🔐 Azure Trusted Signing Tool
+
+> Script tự động ký số (code signing) Windows executables bằng **Azure Trusted Signing** — không cần Azure CLI, không cần browser login.
+
+## Mục lục
+
+- [Tổng quan](#tổng-quan)
+- [Yêu cầu](#yêu-cầu)
+- [Cấu hình Azure](#cấu-hình-azure)
+- [Cài đặt](#cài-đặt)
+- [Sử dụng](#sử-dụng)
+- [Tích hợp CI/CD](#tích-hợp-cicd)
+- [Troubleshooting](#troubleshooting)
+
+---
+
+## Tổng quan
+
+Tool này sử dụng:
+- **`signtool.exe`** (Windows SDK) — công cụ ký số chuẩn của Microsoft
+- **`Microsoft.Trusted.Signing.Client`** dlib — thư viện Azure Trusted Signing
+- **Service Principal** (App Registration) — xác thực tự động, không cần tương tác
+
+### Kiến trúc
+
+```
+sign-app.ps1
+    │
+    ├── Đọc AZURE_CLIENT_ID / SECRET / TENANT_ID
+    ├── Tạo metadata.json (BOM-free)
+    │
+    └── signtool.exe sign /dlib Azure.CodeSigning.Dlib.dll /dmdf metadata.json
+              │
+              └── Azure Trusted Signing API (eus.codesigning.azure.net)
+                        └── Ký hash → trả về signature → nhúng vào .exe
+```
+
+---
+
+## Yêu cầu
+
+| Thành phần | Version | Ghi chú |
+|-----------|---------|---------|
+| Windows | 10/11 hoặc Server 2019+ | Bắt buộc |
+| PowerShell | 5.1+ | Có sẵn trên Windows |
+| Windows SDK | 10.0.26100+ | Chứa `signtool.exe` |
+| .NET SDK | 8.0+ | Để build project |
+
+---
+
+## Cấu hình Azure
+
+### Tài nguyên đã cấu hình
+
+| Thông số | Giá trị |
+|---------|---------|
+| Tenant ID | `c4f27370-f4da-4e92-b944-6adc120b3683` |
+| Trusted Signing Endpoint | `https://eus.codesigning.azure.net/` |
+| Account Name | `huanld` |
+| Certificate Profile | `codesign-profile` |
+| Trust Type | Private Trust |
+| App Registration | `trusted-signing-sp` |
+| Client ID | `0a2888b4-baa5-48da-abea-24f2e9a1f92f` |
+| Secret Expires | 2028-05-17 |
+
+### Role Assignment
+
+Service Principal `trusted-signing-sp` có role:
+- **Trusted Signing Certificate Profile Signer** trên account `huanld`
+
+### Setup Azure (lần đầu tiên)
+
+1. **Tạo Trusted Signing Account** tại [Azure Portal](https://portal.azure.com):
+   - Resource Group: `signcode`
+   - Account Name: `huanld`
+   - Region: `East US`
+
+2. **Tạo Certificate Profile**:
+   - Profile Name: `codesign-profile`
+   - Profile Type: `Private Trust`
+
+3. **Tạo App Registration**:
+   ```
+   Azure Portal → App registrations → New registration
+   Name: trusted-signing-sp
+   ```
+
+4. **Tạo Client Secret**:
+   ```
+   App registration → Certificates & secrets → New client secret
+   Expiry: 24 months
+   ```
+
+5. **Gán Role**:
+   ```
+   Trusted Signing Account → Access control (IAM) → Add role assignment
+   Role: Trusted Signing Certificate Profile Signer
+   Member: trusted-signing-sp
+   ```
+
+---
+
+## Cài đặt
+
+### 1. Tải Microsoft.Trusted.Signing.Client
+
+Script tự động tải nếu chưa có. Hoặc tải thủ công:
+
+```powershell
+$dir = "$env:TEMP\TrustedSigningClient"
+New-Item -ItemType Directory -Force -Path $dir | Out-Null
+Invoke-WebRequest "https://www.nuget.org/api/v2/package/Microsoft.Trusted.Signing.Client" `
+    -OutFile "$dir\TrustedSigningClient.zip" -UseBasicParsing
+Expand-Archive "$dir\TrustedSigningClient.zip" -DestinationPath $dir -Force
+```
+
+### 2. Xác nhận signtool.exe
+
+```powershell
+Get-ChildItem "C:\Program Files (x86)\Windows Kits\10\bin\*\x86\signtool.exe" |
+    Sort-Object FullName -Descending | Select-Object -First 1
+```
+
+Kết quả mong đợi:
+```
+C:\Program Files (x86)\Windows Kits\10\bin\10.0.26100.0\x86\signtool.exe
+```
+
+---
+
+## Sử dụng
+
+### Cú pháp
+
+```powershell
+powershell -ExecutionPolicy Bypass -File sign-app.ps1 -FilePath <đường_dẫn_file>
+```
+
+### Ví dụ
+
+```powershell
+# Ký file exe đơn
+powershell -ExecutionPolicy Bypass -File sign-app.ps1 -FilePath "C:\build\MyApp.exe"
+
+# Ký file trong thư mục publish
+powershell -ExecutionPolicy Bypass -File sign-app.ps1 `
+    -FilePath "D:\Code\MyProject\bin\Release\net8.0\publish\MyApp.exe"
+
+# Ký nhiều file (loop)
+Get-ChildItem "D:\build\publish" -Filter "*.exe" | ForEach-Object {
+    powershell -ExecutionPolicy Bypass -File sign-app.ps1 -FilePath $_.FullName
+}
+```
+
+### Tham số tùy chỉnh
+
+```powershell
+powershell -ExecutionPolicy Bypass -File sign-app.ps1 `
+    -FilePath       "C:\build\MyApp.exe" `
+    -AccountUrl     "https://eus.codesigning.azure.net/" `
+    -AccountName    "huanld" `
+    -ProfileName    "codesign-profile" `
+    -TimestampUrl   "http://timestamp.acs.microsoft.com" `
+    -SigntoolPath   "C:\Program Files (x86)\Windows Kits\10\bin\10.0.26100.0\x86\signtool.exe"
+```
+
+### Output
+
+```
+[INFO] Signing: C:\build\MyApp.exe
+  Account : huanld / codesign-profile
+
+Trusted Signing
+Version: 1.0.95
+Submitting digest for signing...
+OperationId abc123: InProgress
+Signing completed with status 'Succeeded' in 2.3s
+Successfully signed: C:\build\MyApp.exe
+
+[OK] Signed successfully!
+  Status  : Valid
+  Signer  : CN=huanleducoutlook.onmicrosoft.com, ...
+  Expires : 2026-06-18
+```
+
+### Xác nhận chữ ký
+
+```powershell
+$sig = Get-AuthenticodeSignature "C:\build\MyApp.exe"
+$sig | Format-List Status, SignerCertificate
+```
+
+---
+
+## Tích hợp CI/CD
+
+### PowerShell Build Script
+
+```powershell
+# build-and-sign.ps1
+param([string]$Configuration = "Release")
+
+$projectPath = "D:\Code\MyProject"
+$signScript  = "$PSScriptRoot\sign-app.ps1"
+
+# Build
+dotnet publish $projectPath -c $Configuration -o "$projectPath\publish"
+
+# Sign all executables
+Get-ChildItem "$projectPath\publish" -Filter "*.exe" | ForEach-Object {
+    Write-Host "Signing: $($_.Name)"
+    & powershell -ExecutionPolicy Bypass -File $signScript -FilePath $_.FullName
+    if ($LASTEXITCODE -ne 0) { throw "Signing failed for $($_.Name)" }
+}
+
+Write-Host "All files signed successfully!"
+```
+
+### GitHub Actions / Gitea Actions
+
+```yaml
+- name: Sign Executables
+  shell: pwsh
+  env:
+    AZURE_CLIENT_ID:     ${{ secrets.AZURE_CLIENT_ID }}
+    AZURE_CLIENT_SECRET: ${{ secrets.AZURE_CLIENT_SECRET }}
+    AZURE_TENANT_ID:     ${{ secrets.AZURE_TENANT_ID }}
+  run: |
+    powershell -ExecutionPolicy Bypass -File sign-app.ps1 `
+      -FilePath "${{ github.workspace }}\publish\MyApp.exe"
+```
+
+> ⚠️ Trong CI/CD, đặt credentials vào **Secrets** thay vì hardcode trong script.
+
+---
+
+## Troubleshooting
+
+### ❌ `SignerSign() failed` / BOM error
+
+**Nguyên nhân**: metadata.json có BOM (Byte Order Mark).  
+**Giải pháp**: Script đã xử lý tự động bằng `UTF8Encoding(false)`.
+
+### ❌ `Selected user account does not exist in tenant 'Microsoft Services'`
+
+**Nguyên nhân**: Dùng sai client ID (Azure CLI app `04b07795...`).  
+**Giải pháp**: Dùng App Registration riêng trong tenant của bạn.
+
+### ❌ `The request body must contain 'code'` (AADSTS900144)
+
+**Nguyên nhân**: Dùng OAuth2 v1 endpoint với sai tên parameter.  
+**Giải pháp**: Dùng v2.0 endpoint + hashtable body (đã sửa trong script hiện tại).
+
+### ❌ `Signing failed` với status `UnknownError`
+
+**Nguyên nhân**: Certificate Profile là **Private Trust** — chỉ verify được trong môi trường tin tưởng nội bộ.  
+**Giải pháp**: Upgrade lên **Public Trust** để distribute ra ngoài (yêu cầu địa chỉ tổ chức tại Mỹ/EU và Microsoft vetting).
+
+### ❌ `signtool.exe not found`
+
+```powershell
+# Tìm signtool.exe
+Get-ChildItem "C:\Program Files (x86)\Windows Kits" -Filter "signtool.exe" -Recurse |
+    Sort-Object FullName -Descending | Select-Object -First 1 FullName
+```
+
+Nếu không có, cài Windows SDK từ:
+```
+https://developer.microsoft.com/en-us/windows/downloads/windows-sdk/
+```
+
+### ❌ Role assignment chưa có hiệu lực
+
+Role mới gán cần **5-10 phút** để propagate. Chờ rồi thử lại.
+
+---
+
+## Tham khảo
+
+- [Azure Trusted Signing Docs](https://learn.microsoft.com/en-us/azure/trusted-signing/)
+- [Microsoft.Trusted.Signing.Client NuGet](https://www.nuget.org/packages/Microsoft.Trusted.Signing.Client)
+- [signtool.exe Reference](https://learn.microsoft.com/en-us/windows/win32/seccrypto/signtool)
+- [Azure Identity - DefaultAzureCredential](https://learn.microsoft.com/en-us/dotnet/api/azure.identity.defaultazurecredential)

metadata.template.json

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+{
+  "Endpoint": "https://eus.codesigning.azure.net/",
+  "CodeSigningAccountName": "<YOUR_ACCOUNT_NAME>",
+  "CertificateProfileName": "<YOUR_PROFILE_NAME>",
+  "ExcludeCredentials": [
+    "WorkloadIdentityCredential",
+    "ManagedIdentityCredential",
+    "SharedTokenCacheCredential",
+    "VisualStudioCredential",
+    "VisualStudioCodeCredential",
+    "AzureCliCredential",
+    "AzurePowerShellCredential",
+    "AzureDeveloperCliCredential",
+    "InteractiveBrowserCredential"
+  ]
+}

sign-app.ps1

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+param(
+    [Parameter(Mandatory = $true)]
+    [string]$FilePath,
+
+    [string]$AccountUrl        = "https://eus.codesigning.azure.net/",
+    [string]$AccountName       = "huanld",
+    [string]$ProfileName       = "codesign-profile",
+    [string]$TimestampUrl      = "http://timestamp.acs.microsoft.com",
+    [string]$SigntoolPath      = "C:\Program Files (x86)\Windows Kits\10\bin\10.0.26100.0\x86\signtool.exe",
+    [string]$DlibPath          = "$env:TEMP\TrustedSigningClient\bin\x86\Azure.CodeSigning.Dlib.dll"
+)
+
+$ErrorActionPreference = "Stop"
+
+# ── Service Principal Credentials ──────────────────────────────────────────
+$env:AZURE_CLIENT_ID     = "0a2888b4-baa5-48da-abea-24f2e9a1f92f"
+$env:AZURE_CLIENT_SECRET = "QBe8Q~AdrbDO3XqWG.VFHbepXe3Pf4jJYIdKbdkA"
+$env:AZURE_TENANT_ID     = "c4f27370-f4da-4e92-b944-6adc120b3683"
+
+# ── Validate tools ──────────────────────────────────────────────────────────
+if (-not (Test-Path $FilePath))    { Write-Error "File not found: $FilePath"; exit 1 }
+if (-not (Test-Path $SigntoolPath)){ Write-Error "signtool.exe not found: $SigntoolPath"; exit 1 }
+if (-not (Test-Path $DlibPath))    {
+    Write-Host "[INFO] Downloading Microsoft.Trusted.Signing.Client..."
+    $pkgDir = "$env:TEMP\TrustedSigningClient"
+    New-Item -ItemType Directory -Force -Path $pkgDir | Out-Null
+    $zip = "$pkgDir\TrustedSigningClient.zip"
+    Invoke-WebRequest "https://www.nuget.org/api/v2/package/Microsoft.Trusted.Signing.Client" `
+        -OutFile $zip -UseBasicParsing
+    Expand-Archive -Path $zip -DestinationPath $pkgDir -Force
+    if (-not (Test-Path $DlibPath)) { Write-Error "Dlib not found after download."; exit 1 }
+    Write-Host "[INFO] Dlib ready."
+}
+
+# ── Create metadata.json (no BOM) ──────────────────────────────────────────
+$metadataPath = "$env:TEMP\TrustedSigningClient\metadata.json"
+$metadataJson = @"
+{"Endpoint":"$AccountUrl","CodeSigningAccountName":"$AccountName","CertificateProfileName":"$ProfileName","ExcludeCredentials":["WorkloadIdentityCredential","ManagedIdentityCredential","SharedTokenCacheCredential","VisualStudioCredential","VisualStudioCodeCredential","AzureCliCredential","AzurePowerShellCredential","AzureDeveloperCliCredential","InteractiveBrowserCredential"]}
+"@
+[System.IO.File]::WriteAllText($metadataPath, $metadataJson.Trim(), [System.Text.UTF8Encoding]::new($false))
+
+# ── Sign ────────────────────────────────────────────────────────────────────
+Write-Host ""
+Write-Host "[INFO] Signing: $FilePath"
+Write-Host "  Account : $AccountName / $ProfileName"
+Write-Host ""
+
+& $SigntoolPath sign /v /fd sha256 `
+    /tr $TimestampUrl /td sha256 `
+    /dlib $DlibPath `
+    /dmdf $metadataPath `
+    $FilePath
+
+if ($LASTEXITCODE -eq 0) {
+    $sig = Get-AuthenticodeSignature $FilePath
+    Write-Host ""
+    Write-Host "[OK] Signed successfully!"
+    Write-Host "  Status  : $($sig.Status)"
+    Write-Host "  Signer  : $($sig.SignerCertificate.Subject)"
+    Write-Host "  Expires : $($sig.SignerCertificate.NotAfter.ToString('yyyy-MM-dd'))"
+} else {
+    Write-Error "Signing failed! Exit code: $LASTEXITCODE"
+    exit $LASTEXITCODE
+}