feat(sdk-coin-icp): implement getHashFunction

Ticket: WIN-5178

Author: DinshawKothari

modules/sdk-coin-icp/src/icp.ts

@@ -36,7 +36,7 @@ import {
 } from './lib/iface';
 import { TransactionBuilderFactory } from './lib/transactionBuilderFactory';
 import utils from './lib/utils';
-import { createHash } from 'crypto';
+import { createHash, Hash } from 'crypto';
 import { Principal } from '@dfinity/principal';
 import axios from 'axios';
 
@@ -134,6 +134,11 @@ export class Icp extends BaseCoin {
     return 'ecdsa';
   }
 
+  /** @inheritDoc **/
+  getHashFunction(): Hash {
+    return createHash('sha256');
+  }
+
   private async getAddressFromPublicKey(hexEncodedPublicKey: string) {
     return utils.getAddressFromPublicKey(hexEncodedPublicKey);
   }