Explicitly specify hash in client applications

For some signing implementations, such as ed25519, a non-default hash
implementation must be specified when creating the Gateway connection in
client applications. Rather than relying on the default hash algorithm,
it is probably good practice in general to specify an algorithm that is
compatible with your signing implementation.

This change explicitly specifies the hash algorithm to raise visibility
of the option to select the hash algorithm.

Signed-off-by: Mark S. Lewis <Mark.S.Lewis@outlook.com>

asset-transfer-basic/application-gateway-go/assetTransfer.go

@@ -18,6 +18,7 @@ import (
 	"time"
 
 	"github.com/hyperledger/fabric-gateway/pkg/client"
+	"github.com/hyperledger/fabric-gateway/pkg/hash"
 	"github.com/hyperledger/fabric-gateway/pkg/identity"
 	"github.com/hyperledger/fabric-protos-go-apiv2/gateway"
 	"google.golang.org/grpc"
@@ -50,6 +51,7 @@ func main() {
 	gw, err := client.Connect(
 		id,
 		client.WithSign(sign),
+		client.WithHash(hash.SHA256),
 		client.WithClientConnection(clientConnection),
 		// Default timeouts for different gRPC calls
 		client.WithEvaluateTimeout(5*time.Second),

asset-transfer-basic/application-gateway-java/src/main/java/App.java

@@ -16,6 +16,7 @@
 import org.hyperledger.fabric.client.EndorseException;
 import org.hyperledger.fabric.client.Gateway;
 import org.hyperledger.fabric.client.GatewayException;
+import org.hyperledger.fabric.client.Hash;
 import org.hyperledger.fabric.client.SubmitException;
 import org.hyperledger.fabric.client.identity.Identities;
 import org.hyperledger.fabric.client.identity.Identity;
@@ -60,7 +61,11 @@ public static void main(final String[] args) throws Exception {
 		// this endpoint.
 		var channel = newGrpcConnection();
 
-		var builder = Gateway.newInstance().identity(newIdentity()).signer(newSigner()).connection(channel)
+		var builder = Gateway.newInstance()
+                .identity(newIdentity())
+                .signer(newSigner())
+                .hash(Hash.SHA256)
+                .connection(channel)
 				// Default timeouts for different gRPC calls
 				.evaluateOptions(options -> options.withDeadlineAfter(5, TimeUnit.SECONDS))
 				.endorseOptions(options -> options.withDeadlineAfter(15, TimeUnit.SECONDS))
@@ -131,7 +136,7 @@ public void run() throws GatewayException, CommitException {
 		// Update an asset which does not exist.
 		updateNonExistentAsset();
 	}
-	
+
 	/**
 	 * This type of transaction would typically only be run once by an application
 	 * the first time it was started after its initial deployment. A new version of
@@ -152,7 +157,7 @@ private void getAllAssets() throws GatewayException {
 		System.out.println("\n--> Evaluate Transaction: GetAllAssets, function returns all the current assets on the ledger");
 
 		var result = contract.evaluateTransaction("GetAllAssets");
-		
+
 		System.out.println("*** Result: " + prettyJson(result));
 	}
 
@@ -202,15 +207,15 @@ private void transferAssetAsync() throws EndorseException, SubmitException, Comm
 			throw new RuntimeException("Transaction " + status.getTransactionId() +
 					" failed to commit with status code " + status.getCode());
 		}
-		
+
 		System.out.println("*** Transaction committed successfully");
 	}
 
 	private void readAssetById() throws GatewayException {
 		System.out.println("\n--> Evaluate Transaction: ReadAsset, function returns asset attributes");
 
 		var evaluateResult = contract.evaluateTransaction("ReadAsset", assetId);
-		
+
 		System.out.println("*** Result:" + prettyJson(evaluateResult));
 	}
 
@@ -221,9 +226,9 @@ private void readAssetById() throws GatewayException {
 	private void updateNonExistentAsset() {
 		try {
 			System.out.println("\n--> Submit Transaction: UpdateAsset asset70, asset70 does not exist and should return an error");
-			
+
 			contract.submitTransaction("UpdateAsset", "asset70", "blue", "5", "Tomoko", "300");
-			
+
 			System.out.println("******** FAILED to return an error");
 		} catch (EndorseException | SubmitException | CommitStatusException e) {
 			System.out.println("*** Successfully caught the error: ");

asset-transfer-basic/application-gateway-javascript/src/app.js

@@ -5,7 +5,7 @@
  */
 
 const grpc = require('@grpc/grpc-js');
-const { connect, signers } = require('@hyperledger/fabric-gateway');
+const { connect, hash, signers } = require('@hyperledger/fabric-gateway');
 const crypto = require('node:crypto');
 const fs = require('node:fs/promises');
 const path = require('node:path');
@@ -79,6 +79,7 @@ async function main() {
         client,
         identity: await newIdentity(),
         signer: await newSigner(),
+        hash: hash.sha256,
         // Default timeouts for different gRPC calls
         evaluateOptions: () => {
             return { deadline: Date.now() + 5000 }; // 5 seconds

asset-transfer-basic/application-gateway-typescript/src/app.ts

@@ -5,7 +5,7 @@
  */
 
 import * as grpc from '@grpc/grpc-js';
-import { connect, Contract, Identity, Signer, signers } from '@hyperledger/fabric-gateway';
+import { connect, Contract, hash, Identity, Signer, signers } from '@hyperledger/fabric-gateway';
 import * as crypto from 'crypto';
 import { promises as fs } from 'fs';
 import * as path from 'path';
@@ -46,6 +46,7 @@ async function main(): Promise<void> {
         client,
         identity: await newIdentity(),
         signer: await newSigner(),
+        hash: hash.sha256,
         // Default timeouts for different gRPC calls
         evaluateOptions: () => {
             return { deadline: Date.now() + 5000 }; // 5 seconds
@@ -243,4 +244,4 @@ function displayInputParameters(): void {
     console.log(`tlsCertPath:       ${tlsCertPath}`);
     console.log(`peerEndpoint:      ${peerEndpoint}`);
     console.log(`peerHostAlias:     ${peerHostAlias}`);
-}
+}

asset-transfer-basic/rest-api-go/web/initialize.go

@@ -9,6 +9,7 @@ import (
 	"time"
 
 	"github.com/hyperledger/fabric-gateway/pkg/client"
+	"github.com/hyperledger/fabric-gateway/pkg/hash"
 	"github.com/hyperledger/fabric-gateway/pkg/identity"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/credentials"
@@ -24,6 +25,7 @@ func Initialize(setup OrgSetup) (*OrgSetup, error) {
 	gateway, err := client.Connect(
 		id,
 		client.WithSign(sign),
+		client.WithHash(hash.SHA256),
 		client.WithClientConnection(clientConnection),
 		client.WithEvaluateTimeout(5*time.Second),
 		client.WithEndorseTimeout(15*time.Second),

asset-transfer-events/application-gateway-go/app.go

@@ -15,6 +15,7 @@ import (
 	"time"
 
 	"github.com/hyperledger/fabric-gateway/pkg/client"
+	"github.com/hyperledger/fabric-gateway/pkg/hash"
 )
 
 const (
@@ -35,6 +36,7 @@ func main() {
 	gateway, err := client.Connect(
 		id,
 		client.WithSign(sign),
+		client.WithHash(hash.SHA256),
 		client.WithClientConnection(clientConnection),
 		client.WithEvaluateTimeout(5*time.Second),
 		client.WithEndorseTimeout(15*time.Second),