Merge pull request #6534 from BitGo/coin-4944

fix(sdk-coin-vet): implement getHashFunction for vet sdk

Author: at31416

modules/sdk-coin-vet/package.json

@@ -40,6 +40,7 @@
     ]
   },
   "dependencies": {
+    "@bitgo/blake2b": "^3.2.4",
     "@bitgo/abstract-eth": "^24.8.1",
     "@bitgo/sdk-core": "^35.8.0",
     "@bitgo/secp256k1": "^1.4.0",

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

@@ -1,5 +1,6 @@
 import * as _ from 'lodash';
 import BigNumber from 'bignumber.js';
+import blake2b from '@bitgo/blake2b';
 import {
   AuditDecryptedKeyParams,
   BaseCoin,
@@ -19,7 +20,7 @@ import {
 import { BaseCoin as StaticsBaseCoin } from '@bitgo/statics';
 import utils from './lib/utils';
 import { bip32 } from '@bitgo/secp256k1';
-import { randomBytes } from 'crypto';
+import { randomBytes, Hash } from 'crypto';
 import { KeyPair as EthKeyPair } from '@bitgo/abstract-eth';
 import { TransactionBuilderFactory } from './lib';
 import { ExplainTransactionOptions, VetParseTransactionOptions } from './lib/types';
@@ -216,4 +217,24 @@ export class Vet extends BaseCoin {
     /** https://bitgoinc.atlassian.net/browse/COIN-4213 */
     throw new Error('Method not implemented.');
   }
+
+  /**
+   * Function to get coin specific hash function used to generate transaction digests.
+   * @returns {@see Hash} hash function if implemented, otherwise throws exception
+   */
+  getHashFunction(): Hash {
+    const blake = blake2b(32);
+
+    // We return an object that mimics the Hash interface
+    return {
+      update(data: Buffer | Uint8Array) {
+        blake.update(data);
+        return this;
+      },
+      digest() {
+        const uint8Result = blake.digest();
+        return Buffer.from(uint8Result);
+      },
+    } as unknown as Hash;
+  }
 }