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@transmute/did-key-bls12381

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@transmute/did-key-bls12381

``` npm i @transmute/did-key-bls12381@latest --save ```

    0.3.0-unstable.10latest
    GitHub

Version published
Maintainers
2
Weekly downloads
862
increased by26.39%

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Changelog

Source

0.3.0-unstable.10 (2022-12-12)

Note: Version bump only for package root

Readme

Source

did-key-bls12381

npm i @transmute/did-key-bls12381@latest --save

Usage

Generate

import crypto from 'crypto'; import * as bls12381 from '@transmute/did-key-bls12381'; const { didDocument, keys } = await bls12381.generate( { secureRandom: () => { return Uint8Array.from(crypto.randomBytes(32)); }, }, { accept: 'application/did+json' } );

Export

import { Bls12381KeyPairs } from '@transmute/did-key-bls12381'; const keys = await Bls12381KeyPairs.generate({ secureRandom: () => { return Uint8Array.from( Buffer.from( '5a2b1f37ecc9fb7f27e1aa3daa4d66d9c3e54a4c0dcd53a4a5cacdfaf50578cb', 'hex' ) ); }, }); const g1 = await keys.g1KeyPair.export({ type: 'JsonWebKey2020', privateKey: true, }); const g2 = await keys.g2KeyPair.export({ type: 'JsonWebKey2020', privateKey: true, });
BbsBlsSignature2020 and BbsBlsSignatureProof2020

This suite was created after https://www.w3.org/2018/credentials/v1 so it must be added to the credential context.

import { ld as vcjs } from '@transmute/vc.js'; import * as bls12381 from '@transmute/did-key-bls12381'; import { Bls12381G2KeyPair, BbsBlsSignature2020, BbsBlsSignatureProof2020, deriveProof, } from '@mattrglobal/jsonld-signatures-bbs'; const keys = await bls12381.Bls12381KeyPairs.generate({ secureRandom: () => { return Uint8Array.from( Buffer.from( '5a2b1f37ecc9fb7f27e1aa3daa4d66d9c3e54a4c0dcd53a4a5cacdfaf50578cb', 'hex' ) ); }, }); const g2 = await keys.g2KeyPair.export({ type: 'Bls12381G2Key2020', privateKey: true, }); const key = await Bls12381G2KeyPair.from(g2); const suite = new BbsBlsSignature2020({ key, date: '2021-06-19T18:53:11Z', }); const verifiableCredential = await vcjs.issue({ credential: { '@context': [ 'https://www.w3.org/2018/credentials/v1', // 🧙‍♂️ This extension context is required. 'https://w3id.org/security/suites/bls12381-2020/v1', ], id: 'http://example.gov/credentials/3732', type: ['VerifiableCredential'], issuer: 'did:key:z5TcEUwEFkVuVhRpBinQrCgAtSmtQxyajQvpjma5TnWedYqJNXKYvS3UA4rrAkqfMm9VnhiZAf9gpqj7DJDsUJTAJkisUNbenUy64kitTduKihxQb4ScGb1XfRHzMMJWBQa7o7ar46ACzdfW4oqzpnj8gqLH2fjQF82LQACATNc3pXem8chkM7vEQKHKcK2HHK8tbVdfP', issuanceDate: '2021-06-19T18:53:11Z', credentialSubject: { id: 'did:example:ebfeb1f712ebc6f1c276e12ec21', }, }, suite, documentLoader, }); const frame = { '@context': [ 'https://www.w3.org/2018/credentials/v1', 'https://w3id.org/security/suites/bls12381-2020/v1', ], type: ['VerifiableCredential'], credentialSubject: { '@explicit': true, id: {}, }, }; const derivedVerifiableCredential = await deriveProof( verifiableCredential, frame, { suite: new BbsBlsSignatureProof2020(), documentLoader: async (iri: string) => { if (iri.startsWith('did:key:z5T')) { const { didDocument } = await bls12381.resolve(iri, { accept: 'application/did+ld+json', }); return { document: didDocument, }; } return documentLoader(iri); }, } ); const verifiablePresentation = await vcjs.signPresentation({ presentation: { // note that this is required because BBS+ is not in credentials/v1 '@context': derivedVerifiableCredential['@context'], type: ['VerifiablePresentation'], holder: g2.controller, verifiableCredential: [derivedVerifiableCredential], }, challenge: 'nonce-123', domain: 'example.com', suite, // BbsBlsSignature2020 NOT BbsBlsSignatureProof2020 documentLoader, }); const verification = await vcjs.verify({ presentation: verifiablePresentation, challenge: 'nonce-123', domain: 'example.com', suiteMap: { BbsBlsSignature2020, BbsBlsSignatureProof2020, }, documentLoader: async (iri: string) => { if (iri.startsWith('did:key:z5T')) { const { didDocument } = await bls12381.resolve(iri, { accept: 'application/did+ld+json', }); return { document: didDocument, }; } return documentLoader(iri); }, });

Resolve

import * as bls12381 from '@transmute/did-key-bls12381'; const { didDocument, } = await bls12381.resolve( 'did:key:z5TcEUwEFkVuVhRpBinQrCgAtSmtQxyajQvpjma5TnWedYqJNXKYvS3UA4rrAkqfMm9VnhiZAf9gpqj7DJDsUJTAJkisUNbenUy64kitTduKihxQb4ScGb1XfRHzMMJWBQa7o7ar46ACzdfW4oqzpnj8gqLH2fjQF82LQACATNc3pXem8chkM7vEQKHKcK2HHK8tbVdfP', { accept: 'application/did+json' } );

Representations

application/did+json

See application/did+json

application/did+ld+json

See application/did+ld+json

FAQs

Last updated on 12 Dec 2022

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