relic is a multi-tool and server for package signing and working with hardware security modules (HSMs).

Package types

• RPM - RedHat packages
• DEB - Debian packages
• JAR - Java archives
• EXE (PE/COFF) - Windows executable
• MSI - Windows installer
• appx, appxbundle - Windows universal application
• CAB - Windows cabinet file
• CAT - Windows security catalog
• XAP - Silverlight and legacy Windows Phone applications
• PS1, PS1XML, MOF, etc. - Microsoft Powershell scripts and modules
• manifest, application - Microsoft ClickOnce manifest
• VSIX - Visual Studio extension
• Mach-O - macOS/iOS signed executables
• DMG, PKG - macOS disk images / installer packages
• APK - Android package
• PGP - inline, detached or cleartext signature of data

Token types

relic can work with several types of token:

• pkcs11 - Industry standard PKCS#11 HSM interface using shared object files
• Cloud services - AWS, Azure and Google Cloud managed keys
• scdaemon - The GnuPG scdaemon service can enable access to OpenPGP cards (such as Yubikey NEO)
• file - Private keys stored in a password-protected file

Features

Relic is primarily meant to operate as a signing server, allowing clients to authenticate with a TLS certificate and sign packages remotely. It can also be used as a standalone signing tool.

Other features include:

• Generating and importing keys in the token
• Importing certificate chains from a PKCS#12 file
• Creating X509 certificate signing requests (CSR) and self-signed certificates
• Limited X509 CA support -- signing CSRs and cross-signing certificates
• Creating simple PGP public keys
• RSA and ECDSA supported for all signature types
• Verify signatures, certificate chains and timestamps on all supported package types
• Sending audit logs to an AMQP broker, with an optional sealing signature
• Save token PINs in the system keyring

Platforms

Linux, Windows and MacOS are supported. Other platforms probably work as well.

relic is tested using libsofthsm2 and Gemalto SafeNet Network HSM (Luna SA). Every vendor PKCS#11 implementation has quirks, so if relic doesn't work with your hardware please submit a pull request.

Installation

Pre-built client binaries are available from the Github releases page. Alternately, relic can be built from source:

go install github.com/sassoftware/relic/v7@latest

The following build tags are also available:

• clientonly - build a lightweight binary without standalone signing features

See doc/relic.yml for an example configuration.

Additional documentation

• Signing Android packages
• Signing MacOS binaries
• Using Azure Key Vault
• Using a PGP card, YubiKey etc.

Related projects

• SoftHSMv2 - file-based PKCS#11 implementation for testing https://github.com/opendnssec/SoftHSMv2
• uts-server - timestamping server for testing https://github.com/kakwa/uts-server
• osslsigncode - Signs EXEs, MSIs, and CABs using openssl https://sourceforge.net/projects/osslsigncode/
• fb-util-for-appx - Builds signed APPX archives https://github.com/facebook/fb-util-for-appx
• OpenVsixSignTool - Sign VSIX extensions using an Azure key vault https://github.com/vcsjones/OpenVsixSignTool

Reference specifications

• PE/COFF specification - https://www.microsoft.com/en-us/download/details.aspx?id=19509
• Authenticode PE specification - http://download.microsoft.com/download/9/c/5/9c5b2167-8017-4bae-9fde-d599bac8184a/Authenticode_PE.docx
• Microsoft ClickOnce manifest structure - https://msdn.microsoft.com/en-us/library/dd947276(v=office.12).aspx
• Microsoft Compound File format (for MSI) - https://msdn.microsoft.com/en-us/library/dd942138.aspx
• Alternate reference for compound document format from OpenOffice - https://www.openoffice.org/sc/compdocfileformat.pdf