Merge pull request #316 from willmeister/feat/315/SignatureVerification

315 Adding signature verification stub

packages/core/src/app/utils/crypto.ts

@@ -0,0 +1,17 @@
+/**
+ * Checks that the message with the provided signature was signed by the private key
+ * associated with the provided public key.
+ *
+ * @param signature the signed message
+ * @param message the message in question
+ * @param publicKey the public key to check the signature against
+ * @returns true if the signature matches the message when decrypted by the publicKey
+ */
+export const verifySignature = (
+  signature: any,
+  message: any,
+  publicKey: any
+): boolean => {
+  // TODO: Make this do actual signature checking
+  return signature === publicKey
+}

packages/core/src/app/utils/index.ts

@@ -23,3 +23,4 @@ export * from './misc'
 export * from './range'
 export * from './buffer'
 export * from './numbers'
+export * from './crypto'

packages/predicates/src/plugins/ownership-predicate.ts

@@ -3,6 +3,7 @@ import {
   StateUpdate,
   Transaction,
   StateObject,
+  verifySignature,
 } from '@pigi/core'
 
 export class OwnershipPredicatePlugin implements PredicatePlugin {
@@ -48,8 +49,13 @@ export class OwnershipPredicatePlugin implements PredicatePlugin {
     transaction: Transaction,
     witness: string
   ): Promise<void> {
-    // TODO: Actually check signature stuffs
-    if (previousStateUpdate.stateObject.data.owner !== witness) {
+    if (
+      !verifySignature(
+        witness,
+        transaction,
+        previousStateUpdate.stateObject.data.owner
+      )
+    ) {
       throw new Error(
         `Cannot transition from state [${JSON.stringify(
           previousStateUpdate