feat: jsonld-credential support (#718)

Signed-off-by: Karim Stekelenburg <karim@animo.id>

DEVREADME.md

@@ -2,6 +2,11 @@
 
 This file is intended for developers working on the internals of the framework. If you're just looking how to get started with the framework, see the [docs](./docs)
 
+## Installing dependencies
+
+Right now, as a patch that will later be changed, some platforms will have an "error" when installing the dependencies with yarn. This is because the BBS signatures library that we use is built for Linux x86 and MacOS x86 (and not Windows and MacOS arm). This means that it will show that it could not download the binary.
+This is not an error for developers, the library that fails is `node-bbs-signaturs` and is an optional dependency for perfomance improvements. It will fallback to a, slower, wasm build.
+
 ## Running tests
 
 Test are executed using jest. Some test require either the **mediator agents** or the **ledger** to be running. When running tests that require a connection to the ledger pool, you need to set the `TEST_AGENT_PUBLIC_DID_SEED` and `GENESIS_TXN_PATH` environment variables.

packages/core/package.json

@@ -23,9 +23,14 @@
     "prepublishOnly": "yarn run build"
   },
   "dependencies": {
+    "@digitalcredentials/jsonld": "^5.2.1",
+    "@digitalcredentials/jsonld-signatures": "^9.3.1",
+    "@digitalcredentials/vc": "^1.1.2",
     "@mattrglobal/bbs-signatures": "^1.0.0",
+    "@mattrglobal/bls12381-key-pair": "^1.0.0",
     "@multiformats/base-x": "^4.0.1",
     "@stablelib/ed25519": "^1.0.2",
+    "@stablelib/random": "^1.0.1",
     "@stablelib/sha256": "^1.0.1",
     "@types/indy-sdk": "^1.16.16",
     "@types/node-fetch": "^2.5.10",

packages/core/src/crypto/LdKeyPair.ts

@@ -0,0 +1,51 @@
+import type { VerificationMethod } from '../modules/dids'
+
+export interface LdKeyPairOptions {
+  id: string
+  controller: string
+}
+
+export abstract class LdKeyPair {
+  public readonly id: string
+  public readonly controller: string
+  public abstract type: string
+
+  public constructor(options: LdKeyPairOptions) {
+    this.id = options.id
+    this.controller = options.controller
+  }
+
+  public static async generate(): Promise<LdKeyPair> {
+    throw new Error('Not implemented')
+  }
+
+  // eslint-disable-next-line @typescript-eslint/no-unused-vars
+  public static async from(verificationMethod: VerificationMethod): Promise<LdKeyPair> {
+    throw new Error('Abstract method from() must be implemented in subclass.')
+  }
+
+  public export(publicKey = false, privateKey = false) {
+    if (!publicKey && !privateKey) {
+      throw new Error('Export requires specifying either "publicKey" or "privateKey".')
+    }
+    const key = {
+      id: this.id,
+      type: this.type,
+      controller: this.controller,
+    }
+
+    return key
+  }
+
+  public abstract fingerprint(): string
+
+  public abstract verifyFingerprint(fingerprint: string): boolean
+
+  public abstract signer(): {
+    sign: (data: { data: Uint8Array | Uint8Array[] }) => Promise<Uint8Array | Array<Uint8Array>>
+  }
+
+  public abstract verifier(): {
+    verify: (data: { data: Uint8Array | Uint8Array[]; signature: Uint8Array }) => Promise<boolean>
+  }
+}

packages/core/src/crypto/WalletKeyPair.ts

@@ -0,0 +1,123 @@
+import type { Wallet } from '..'
+import type { Key } from './Key'
+import type { LdKeyPairOptions } from './LdKeyPair'
+
+import { VerificationMethod } from '../modules/dids'
+import { getKeyDidMappingByVerificationMethod } from '../modules/dids/domain/key-type/keyDidMapping'
+import { JsonTransformer } from '../utils'
+import { MessageValidator } from '../utils/MessageValidator'
+import { Buffer } from '../utils/buffer'
+
+import { LdKeyPair } from './LdKeyPair'
+
+interface WalletKeyPairOptions extends LdKeyPairOptions {
+  wallet: Wallet
+  key: Key
+}
+
+export function createWalletKeyPairClass(wallet: Wallet) {
+  return class WalletKeyPair extends LdKeyPair {
+    public wallet: Wallet
+    public key: Key
+    public type: string
+
+    public constructor(options: WalletKeyPairOptions) {
+      super(options)
+      this.wallet = options.wallet
+      this.key = options.key
+      this.type = options.key.keyType
+    }
+
+    public static async generate(): Promise<WalletKeyPair> {
+      throw new Error('Not implemented')
+    }
+
+    public fingerprint(): string {
+      throw new Error('Method not implemented.')
+    }
+
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    public verifyFingerprint(fingerprint: string): boolean {
+      throw new Error('Method not implemented.')
+    }
+
+    public static async from(verificationMethod: VerificationMethod): Promise<WalletKeyPair> {
+      const vMethod = JsonTransformer.fromJSON(verificationMethod, VerificationMethod)
+      await MessageValidator.validate(vMethod)
+      const { getKeyFromVerificationMethod } = getKeyDidMappingByVerificationMethod(vMethod)
+      const key = getKeyFromVerificationMethod(vMethod)
+
+      return new WalletKeyPair({
+        id: vMethod.id,
+        controller: vMethod.controller,
+        wallet: wallet,
+        key: key,
+      })
+    }
+
+    /**
+     * This method returns a wrapped wallet.sign method. The method is being wrapped so we can covert between Uint8Array and Buffer. This is to make it compatible with the external signature libraries.
+     */
+    public signer(): { sign: (data: { data: Uint8Array | Uint8Array[] }) => Promise<Uint8Array> } {
+      // wrap function for conversion
+      const wrappedSign = async (data: { data: Uint8Array | Uint8Array[] }): Promise<Uint8Array> => {
+        let converted: Buffer | Buffer[] = []
+
+        // convert uint8array to buffer
+        if (Array.isArray(data.data)) {
+          converted = data.data.map((d) => Buffer.from(d))
+        } else {
+          converted = Buffer.from(data.data)
+        }
+
+        // sign
+        const result = await wallet.sign({
+          data: converted,
+          key: this.key,
+        })
+
+        // convert result buffer to uint8array
+        return Uint8Array.from(result)
+      }
+
+      return {
+        sign: wrappedSign.bind(this),
+      }
+    }
+
+    /**
+     * This method returns a wrapped wallet.verify method. The method is being wrapped so we can covert between Uint8Array and Buffer. This is to make it compatible with the external signature libraries.
+     */
+    public verifier(): {
+      verify: (data: { data: Uint8Array | Uint8Array[]; signature: Uint8Array }) => Promise<boolean>
+    } {
+      const wrappedVerify = async (data: {
+        data: Uint8Array | Uint8Array[]
+        signature: Uint8Array
+      }): Promise<boolean> => {
+        let converted: Buffer | Buffer[] = []
+
+        // convert uint8array to buffer
+        if (Array.isArray(data.data)) {
+          converted = data.data.map((d) => Buffer.from(d))
+        } else {
+          converted = Buffer.from(data.data)
+        }
+
+        // verify
+        return wallet.verify({
+          data: converted,
+          signature: Buffer.from(data.signature),
+          key: this.key,
+        })
+      }
+      return {
+        verify: wrappedVerify.bind(this),
+      }
+    }
+
+    public get publicKeyBuffer(): Uint8Array {
+      return new Uint8Array(this.key.publicKey)
+    }
+  }
+}