Add fix for node js SSL 3

Author: Vectorized

.github/workflows/run-tests.yml

@@ -18,7 +18,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [14.x]
+        node-version: [14.x,16.x,17.x,18.x]
 
     steps:
       - uses: actions/checkout@v2

hardhat.config.js

@@ -38,3 +38,17 @@ module.exports = {
   },
   plugins: ['solidity-coverage'],
 };
+
+// The "ripemd160" algorithm is not available anymore in NodeJS 17+ (because of lib SSL 3).
+// The following code replaces it with "sha256" instead.
+
+const crypto = require('crypto');
+
+try {
+  crypto.createHash('ripemd160');
+} catch (e) {
+  const origCreateHash = crypto.createHash;
+  crypto.createHash = (alg, opts) => {
+    return origCreateHash(alg === 'ripemd160' ? 'sha256' : alg, opts);
+  };
+}