SSI Kit

by walt.id

Use web3 identity / self-sovereign identity (SSI)

Getting Started

• CLI | Command Line Interface - Try out the functions of the SSI Kit locally.
• REST Api - Use the functions of the SSI Kit via an REST api.
• Maven/Gradle Dependency - Use the functions of the SSI Kit directly in a Kotlin/Java project.
• Example Projects - Demonstrate how to use the SSI Kit in any Kotlin/Java app

Check out the Official Documentation, to dive deeper into the architecture and configuration options available.

What is the SSI Kit?

A library written in Kotlin/Java to manage Keys, DIDs and VCs. Functions can be used via Maven/Gradle or a REST api.

Features

• Key Management generation, import/export
• Decentralized Identifier (DID) operations (create, register, update, deactivate)
• Verifiable Credential (VC) operations (issue, present, verify)
• EBSI/ESSIF related Use Cases (onboarding, VC exchange, etc.)

For EBSI

• Onboarding EBSI/ESSIF onboarding a natural person/legal entity including the DID creation and registration
• Enable Trusted Issuer process for entitling a legal entity to become a Trusted Issuer in the ESSIF ecosystem.
• Credential Issuance protocols and data formats for issuing W3C credentials from a Trusted Issuer to a natural person.
• Credential Verification verification facilities in order to determine the validity of a W3C Verifiable Credential aligned with EBSI/ESSIF standards.

Example

• Creating W3C Decentralized Identifiers
• Issuing/verifying W3C Verifiable Credentials in JSON_LD and JWT format

fun main() {
    // Load services
    ServiceMatrix("service-matrix.properties")

    // Create DIDs
    val issuerDid = DidService.create(DidMethod.ebsi)
    val holderDid = DidService.create(DidMethod.key)

    // Issue VC with LD_PROOF and JWT format (for show-casing both formats)
    val vcJson = Signatory.getService().issue(
        templateIdOrFilename = "VerifiableId",
        config = ProofConfig(issuerDid = issuerDid, subjectDid = holderDid, proofType = ProofType.LD_PROOF)
    )
    val vcJwt = Signatory.getService().issue(
        templateIdOrFilename = "Europass",
        config = ProofConfig(issuerDid = issuerDid, subjectDid = holderDid, proofType = ProofType.JWT)
    )

    // Present VC in JSON-LD and JWT format (for show-casing both formats)
    val vpJson = Custodian.getService().createPresentation(listOf(vcJson), holderDid)
    val vpJwt = Custodian.getService().createPresentation(listOf(vcJwt), holderDid)

    // Verify VPs, using Signature, JsonSchema and a custom policy
    val resJson = Auditor.getService().verify(vpJson, listOf(SignaturePolicy(), JsonSchemaPolicy()))
    val resJwt = Auditor.getService().verify(vpJwt, listOf(SignaturePolicy(), JsonSchemaPolicy()))

    println("JSON verification result: ${resJson.policyResults}")
    println("JWT verification result:  ${resJwt.policyResults}")
}

Join the community

• Connect and get the latest updates: Discord | Newsletter | YouTube | Twitter
• Get help, request features and report bugs: GitHub Discussions

Standards & Specifications

• EBSI Wallet Conformance
• Verifiable Credentials Data Model 1.0
• Decentralized Identifiers (DIDs) v1.0
• DID Method Rubric
• did:web Decentralized Identifier Method Specification
• The did:key Method v0.7
• Self-Issued OpenID Provider v2
• OpenID Connect for Verifiable Presentations
• OpenID Connect for Verifiable Credential Issuance

License

Licensed under the Apache License, Version 2.0.

Funded & supported by