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Module: key-did-resolver

Installation​

$ npm install key-did-resolver

Usage​

This code includes support for the curves Ed25519, Secp256k1, Secp256r1 (P-256), Secp384r1 (P-384), and Secp521r1 (P-521) which follow the test vectors at: https://github.com/w3c-ccg/did-method-key/tree/main/test-vectors

This code has been tested with the following did:key1 providers: | Curve | Repositry | | ------------------- | -------------------------------------------------------------- | | Ed25519 | https://github.com/ceramicnetwork/js-did/tree/main/packages/key-did-provider-ed25519 | | Secp256k1 | https://github.com/ceramicnetwork/key-did-provider-secp256k1 | | P-256, P-384, P-521 | https://github.com/bshambaugh/did-key-creator |

Compressed2 forms of P-256, P-384, and P-521 are preferred. 3

Code​

Using with secp256k1 did-key:

import * as KeyDidResolver from 'key-did-resolver'
import {Resolver} from 'did-resolver'

const keyDidResolver = KeyDIDResolver.getResolver()
console.log(keyDidResolver)
const didResolver = new Resolver(keyDidResolver)
const doc = await didResolver.resolve('did:key:z6MktvqCyLxTsXUH1tUZncNdVeEZ7hNh7npPRbUU27GTrYb8')

console.log(doc)
console.log(doc.didDocument.verificationMethod)

Output​

Using with secp256k1 did-key:

{
  didResolutionMetadata: { contentType: 'application/did+json' },
  didDocument: {
    id: 'did:key:zQ3shokFTS3brHcDQrn82RUDfCZESWL1ZdCEJwekUDPQiYBme',
    verificationMethod: [ [Object] ],
    authentication: [
      'did:key:zQ3shokFTS3brHcDQrn82RUDfCZESWL1ZdCEJwekUDPQiYBme#zQ3shokFTS3brHcDQrn82RUDfCZESWL1ZdCEJwekUDPQiYBme'
    ],
    assertionMethod: [
      'did:key:zQ3shokFTS3brHcDQrn82RUDfCZESWL1ZdCEJwekUDPQiYBme#zQ3shokFTS3brHcDQrn82RUDfCZESWL1ZdCEJwekUDPQiYBme'
    ],
    capabilityDelegation: [
      'did:key:zQ3shokFTS3brHcDQrn82RUDfCZESWL1ZdCEJwekUDPQiYBme#zQ3shokFTS3brHcDQrn82RUDfCZESWL1ZdCEJwekUDPQiYBme'
    ],
    capabilityInvocation: [
      'did:key:zQ3shokFTS3brHcDQrn82RUDfCZESWL1ZdCEJwekUDPQiYBme#zQ3shokFTS3brHcDQrn82RUDfCZESWL1ZdCEJwekUDPQiYBme'
    ]
  },
  didDocumentMetadata: {}
}
[
  {
    id: 'did:key:zQ3shokFTS3brHcDQrn82RUDfCZESWL1ZdCEJwekUDPQiYBme#zQ3shokFTS3brHcDQrn82RUDfCZESWL1ZdCEJwekUDPQiYBme',
    type: 'Secp256k1VerificationKey2018',
    controller: 'did:key:zQ3shokFTS3brHcDQrn82RUDfCZESWL1ZdCEJwekUDPQiYBme',
    publicKeyBase58: '23o6Sau8NxxzXcgSc3PLcNxrzrZpbLeBn1izfv3jbKhuv'
  }
]

The code for other curves is similar. Changing the did:key string is sufficient.

code snippet for ed25519​

const doc = await didResolver.resolve('did:key:z6MktvqCyLxTsXUH1tUZncNdVeEZ7hNh7npPRbUU27GTrYb8')

code snippet for P-256​

const doc = await didResolver.resolve('did:key:zDnaeUKTWUXc1HDpGfKbEK31nKLN19yX5aunFd7VK1CUMeyJu')

code snippet for P-384​

const doc = await didResolver.resolve('did:key:z82LkvCwHNreneWpsgPEbV3gu1C6NFJEBg4srfJ5gdxEsMGRJUz2sG9FE42shbn2xkZJh54')

code snippet for P-521​

const doc = await didResolver.resolve('did:key:z2J9gcGhudjgwsDLv4qJVM6DysnsjWRS6ggtCsSYpV9TGxd9WGoE1EkPxdvPcqEs7eLsQA985AGXPuqttPP7WJ5Qdiz27U3t')

Note: All P-*** curves are compressed

The verification method results are slightly different. Here is a sampling:

did document verificationMethod for ed25519:​

[
  {
    id: 'did:key:z6MktvqCyLxTsXUH1tUZncNdVeEZ7hNh7npPRbUU27GTrYb8#z6MktvqCyLxTsXUH1tUZncNdVeEZ7hNh7npPRbUU27GTrYb8',
    type: 'Ed25519VerificationKey2018',
    controller: 'did:key:z6MktvqCyLxTsXUH1tUZncNdVeEZ7hNh7npPRbUU27GTrYb8',
    publicKeyBase58: 'FUaAP6i2XyyouPds73QneYgZJ86qhua2jaZYBqJSwKok'
  }
]

did document verificationMethod for P-256:​

[
  {
    id: 'did:key:zDnaeUKTWUXc1HDpGfKbEK31nKLN19yX5aunFd7VK1CUMeyJu#zDnaeUKTWUXc1HDpGfKbEK31nKLN19yX5aunFd7VK1CUMeyJu',
    type: 'JsonWebKey2020',
    controller: 'did:key:zDnaeUKTWUXc1HDpGfKbEK31nKLN19yX5aunFd7VK1CUMeyJu',
    publicKeyJwk: {
      kty: 'EC',
      crv: 'P-256',
      x: 'OcPddBMXKURtwbPaZ9SfwEb8vwcvzFufpRwFuXQwf5Y',
      y: 'nEA7FjXwRJ8CvUInUeMxIaRDTxUvKysqP2dSGcXZJfY'
    }
  }
]

did document verificationMethod for P-384:​

[
  {
    id: 'did:key:z82LkvCwHNreneWpsgPEbV3gu1C6NFJEBg4srfJ5gdxEsMGRJUz2sG9FE42shbn2xkZJh54#z82LkvCwHNreneWpsgPEbV3gu1C6NFJEBg4srfJ5gdxEsMGRJUz2sG9FE42shbn2xkZJh54',
    type: 'JsonWebKey2020',
    controller: 'did:key:z82LkvCwHNreneWpsgPEbV3gu1C6NFJEBg4srfJ5gdxEsMGRJUz2sG9FE42shbn2xkZJh54',
    publicKeyJwk: {
      kty: 'EC',
      crv: 'P-384',
      x: 'CA-iNoHDg1lL8pvX3d1uvExzVfCz7Rn6tW781Ub8K5MrDf2IMPyL0RTDiaLHC1JT',
      y: 'Kpnrn8DkXUD3ge4mFxi-DKr0DYO2KuJdwNBrhzLRtfMa3WFMZBiPKUPfJj8dYNl_'
    }
  }
]

did document verificationMethod for P-521:​

[
  {
    id: 'did:key:z2J9gcGhudjgwsDLv4qJVM6DysnsjWRS6ggtCsSYpV9TGxd9WGoE1EkPxdvPcqEs7eLsQA985AGXPuqttPP7WJ5Qdiz27U3t#z2J9gcGhudjgwsDLv4qJVM6DysnsjWRS6ggtCsSYpV9TGxd9WGoE1EkPxdvPcqEs7eLsQA985AGXPuqttPP7WJ5Qdiz27U3t',
    type: 'JsonWebKey2020',
    controller: 'did:key:z2J9gcGhudjgwsDLv4qJVM6DysnsjWRS6ggtCsSYpV9TGxd9WGoE1EkPxdvPcqEs7eLsQA985AGXPuqttPP7WJ5Qdiz27U3t',
    publicKeyJwk: {
      kty: 'EC',
      crv: 'P-521',
      x: 'ATkofCC8_KAAJ3XSRayyPk8WqF9qahhoQVjbHtzbe5MSaaFiMKBZr-CurF9IcpJD-YYEukPmarSKFpXLtwAdiONT',
      y: 'AWuYkJ7iaFhfz_dzFemaBnuq1WFnoZeIha7KpE9benPTX9FQhAoyHY-2qO4IyqGe1XGGtx8eJXvp57xMtUXm2rAH'
    }
 }
]

Testing​

Due to problems with parsing JSON with BigInt, tests need to be run with Jest in Serial mode. Use npm run test -- --runInBand .

References​

[Standards for Efficient Cryptography SEC 2: Recommended Elliptic Curve Domain Parameters Certicom Research Contact: Daniel R. L. Brown (dbrown@certicom.com) January 27, 2010 Version 2.0 ], http://www.secg.org/sec2-v2.pdf

[FIPS PUB 186-4 ,FEDERAL INFORMATION PROCESSING STANDARDS PUBLICATION, Digital Signature Standard (DSS)], https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.186-4.pdf

[Compact representation of an elliptic curve point, Network Working Group, A.J. Jivsov, March 15, 2014], https://tools.ietf.org/id/draft-jivsov-ecc-compact-05.html

Variables​

default​

• default: Object

Type declaration​

NameType
getResolver() => ResolverRegistry

Functions​

getResolver​

▸ getResolver(): ResolverRegistry

Returns​

ResolverRegistry

  1. The syntax of a did:key is did:key:id. The did:key id is the base58btc string representation of the Uint8Array (byte array) consisting of the the multicodec name followed by the public key {raw,uncompressed,compressed}.↩
  2. Compressed keys are the X coordinate of the public key with a prefix that depends on the sign of the Y curve coordinate. The prefix is '02' if even and '03' if odd.↩
  3. During development there was not yet consensus on using all compressed keys. Support for uncompressed keys with the '04' prefix and raw keys (just the x,y bytes with no prefix) was kept for the P-256 and P-384 curves.↩