Set OpenSSL SHA1 flag in build scripts

Local OpenSSL defaults can reject legacy SHA-1 signatures during dotnet operations. Set the required compatibility flag inside the repository scripts so restore, build, publish, clean, and formatting paths do not depend on each caller's shell environment.

Assisted-by: OpenCode:openai/gpt-5.5:OpenCode

BuildTools/format.ps1

@@ -2,6 +2,7 @@
 # Trigger the commit hook's formatter against the working tree without committing,
 # applying the same formatting the pre-commit hook enforces.
 $ErrorActionPreference = 'Stop'
+$env:OPENSSL_ENABLE_SHA1_SIGNATURES = '1'
 Push-Location (Join-Path $PSScriptRoot '..')
 try {
     bash BuildTools/pre-commit --format

BuildTools/pre-commit

@@ -8,6 +8,7 @@ set -eu
 
 DOTNET_FORMAT_VERSION=10.0.100-rtm.25531.102
 DOTNET_FORMAT_SOURCE="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet10-transport/nuget/v3/index.json"
+export OPENSSL_ENABLE_SHA1_SIGNATURES=1
 
 # Per-OS tool cache location + binary suffix. Windows uses %LOCALAPPDATA% and a .exe
 # suffix; Unix-likes follow the XDG basedir spec (falling back to ~/.local/share) and

build.ps1

@@ -6,4 +6,5 @@ param(
     [string]$Configuration = 'Debug'
 )
 $ErrorActionPreference = 'Stop'
+$env:OPENSSL_ENABLE_SHA1_SIGNATURES = '1'
 dotnet build ILSpy.sln -c $Configuration "-p:Platform=Any CPU" @args

clean.ps1

@@ -1,5 +1,6 @@
 #!/usr/bin/env pwsh
 # Clean the Debug and Release build outputs of ILSpy.sln.
 $ErrorActionPreference = 'Stop'
+$env:OPENSSL_ENABLE_SHA1_SIGNATURES = '1'
 dotnet clean ILSpy.sln -c Debug "-p:Platform=Any CPU" @args
 dotnet clean ILSpy.sln -c Release "-p:Platform=Any CPU" @args

publish.ps1

@@ -13,6 +13,7 @@ param(
     [string]$Platform = 'windows'
 )
 $ErrorActionPreference = 'Stop'
+$env:OPENSSL_ENABLE_SHA1_SIGNATURES = '1'
 
 $base = "./ILSpy/bin/$Configuration/net10.0"
 

publishlocaldev.ps1

@@ -1,5 +1,8 @@
 # For local development of the VSIX package - build and publish (VS2022 also needs arm64)
 
+$ErrorActionPreference = 'Stop'
+$env:OPENSSL_ENABLE_SHA1_SIGNATURES = '1'
+
 $configuration = "Debug"
 
 dotnet build ./ILSpy.sln -c $configuration

restore.ps1

@@ -2,4 +2,5 @@
 # Restore all NuGet packages for ILSpy.sln, honouring the committed packages.lock.json files.
 # Use updatedeps.ps1 instead when you have changed a PackageVersion and need to refresh the locks.
 $ErrorActionPreference = 'Stop'
+$env:OPENSSL_ENABLE_SHA1_SIGNATURES = '1'
 dotnet restore ILSpy.sln -p:RestoreEnablePackagePruning=false @args

updatedeps.ps1

@@ -3,4 +3,5 @@
 # Run this after changing a PackageVersion in Directory.Packages.props (or adding a package),
 # then commit the updated lock files.
 $ErrorActionPreference = 'Stop'
+$env:OPENSSL_ENABLE_SHA1_SIGNATURES = '1'
 dotnet restore ILSpy.sln --force-evaluate -p:RestoreEnablePackagePruning=false @args