Code Signing Tool

A Linux-focused code signing tool that helps developers sign binaries and packages to ensure integrity and authenticity during distribution.

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About This Tool

The tool signs Linux software artifacts by producing a cryptographic signature over the artifact's hash. It supports common Linux signing backends and integrates with standard packaging workflows. It operates without UI assumptions, focusing on backend logic and artifact integrity.
Conceptually, it computes a digest (hash) of the target file and signs the digest with a configured private key; it can emit a detached signature or an attached signature depending on workflow needs. It also produces artifacts such as file digest and key fingerprint for auditing.
Beneficiaries include developers, DevSecOps teams, and release engineers distributing Linux packages (DEB/RPM) or tarballs. Unique value lies in multi-key support, configurable hash algorithms, optional RFC3161 timestamping, and streamlined verification in automated pipelines.
Core features include key selection, passphrase handling, detached/attached signatures, multiple output formats, digest and fingerprint outputs, and verification primitives to confirm integrity against public keys. Typical use cases cover release signing, artifact verification in CI, and secure software supply chains.

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How to Use

Provide inputs: specify input_path, key_id, and private_key_path; choose hash_algorithm and signing_scheme.
Configure options: decide between detached_signature and attached formats; optionally provide timestamp_server.
Run signing: execute the tool to generate signature_base64 and digest_hex.
Retrieve outputs: inspect signature, digest, and fingerprint; save signature to output_path if needed.
Verify: use the corresponding public key to verify the signature against the artifact and digest; confirm verification_status is OK.

Frequently Asked Questions

Find Quick Answers

What signature formats are produced?

The tool can emit detached or attached signatures. Outputs include a base64-encoded signature, the artifact digest in hex, and a fingerprint for auditing. Verification can be performed against the public key to confirm integrity.

Can I use this in CI pipelines?

Yes. The tool is designed for CI environments, supports non-interactive key references, and can work with secret stores for private keys. It minimizes manual interaction and integrates with standard artifact workflows.

How do I verify a signature produced by this tool?

Verification uses the public key corresponding to the signing key. For GPG/OpenPGP workflows, use gpg --verify on detached signatures or embedded ones; for OpenSSL-based schemes, verify the digest against the signature with the signer’s public certificate.

How does timestamping affect signing?

If a timestamp server is configured, the tool appends a timestamp token to the signature, providing evidence of signing time for non-repudiation, which is useful for compliance and long-term validation.

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