SPIRE

SPIRE (the SPIFFE Runtime Environment) provides a production-ready implementation of the SPIFFE specification. It exposes the SPIFFE Workload API, which can attest running software systems and issue SPIFFE IDs and SVIDs to them. This allows workloads to establish trust with each other, such as by setting up mTLS connections or signing and verifying JWT tokens.

SPIRE enables secure authentication to services like secret stores, databases, or cloud providers. The package includes both spire-server and spire-agent components for server-side and agent-side operations in trust establishment workflows.

Use cases include securing communications in cloud-native environments, microservices architectures, and hybrid infrastructures where workloads need verifiable identities.

SPIRE operates by attesting workloads via the SPIFFE Workload API and issuing short-lived SPIFFE IDs and SVIDs (SPIFFE Verifiable Identity Documents). Workloads use these identities to mutually authenticate, typically over mTLS for encrypted connections or JWT for token-based verification. The server manages trust bundles and entries, while agents run locally to validate and attest host software, enabling trust across diverse platforms without relying on traditional credentials.