test: improve test-crypto-rsa-dsa

* use const and let instead of var
* use assert.strictEqual or assert.strictDeepEqual instead of assert.equal
* use arrow functions
* swap assertions arguments to match the standard
* validate the error for assert.throws

PR-URL: #10681
Backport-PR-URL: #13785
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Author: edsadr

test/parallel/test-crypto-rsa-dsa.js

@@ -26,6 +26,9 @@ const dsaKeyPem = fs.readFileSync(common.fixturesDir + '/test_dsa_privkey.pem',
 const dsaKeyPemEncrypted = fs.readFileSync(
   common.fixturesDir + '/test_dsa_privkey_encrypted.pem', 'ascii');
 
+const decryptError = new RegExp('^Error: error:06065064:digital envelope ' +
+                                'routines:EVP_DecryptFinal_ex:bad decrypt$');
+
 // Test RSA encryption/decryption
 {
   const input = 'I AM THE WALRUS';
@@ -34,13 +37,13 @@ const dsaKeyPemEncrypted = fs.readFileSync(
   let encryptedBuffer = crypto.publicEncrypt(rsaPubPem, bufferToEncrypt);
 
   let decryptedBuffer = crypto.privateDecrypt(rsaKeyPem, encryptedBuffer);
-  assert.strictEqual(input, decryptedBuffer.toString());
+  assert.strictEqual(decryptedBuffer.toString(), input);
 
   let decryptedBufferWithPassword = crypto.privateDecrypt({
     key: rsaKeyPemEncrypted,
     passphrase: 'password'
   }, encryptedBuffer);
-  assert.strictEqual(input, decryptedBufferWithPassword.toString());
+  assert.strictEqual(decryptedBufferWithPassword.toString(), input);
 
   encryptedBuffer = crypto.publicEncrypt({
     key: rsaKeyPemEncrypted,
@@ -51,7 +54,7 @@ const dsaKeyPemEncrypted = fs.readFileSync(
     key: rsaKeyPemEncrypted,
     passphrase: 'password'
   }, encryptedBuffer);
-  assert.strictEqual(input, decryptedBufferWithPassword.toString());
+  assert.strictEqual(decryptedBufferWithPassword.toString(), input);
 
   encryptedBuffer = crypto.privateEncrypt({
     key: rsaKeyPemEncrypted,
@@ -62,53 +65,53 @@ const dsaKeyPemEncrypted = fs.readFileSync(
     key: rsaKeyPemEncrypted,
     passphrase: Buffer.from('password')
   }, encryptedBuffer);
-  assert.strictEqual(input, decryptedBufferWithPassword.toString());
+  assert.strictEqual(decryptedBufferWithPassword.toString(), input);
 
   encryptedBuffer = crypto.publicEncrypt(certPem, bufferToEncrypt);
 
   decryptedBuffer = crypto.privateDecrypt(keyPem, encryptedBuffer);
-  assert.strictEqual(input, decryptedBuffer.toString());
+  assert.strictEqual(decryptedBuffer.toString(), input);
 
   encryptedBuffer = crypto.publicEncrypt(keyPem, bufferToEncrypt);
 
   decryptedBuffer = crypto.privateDecrypt(keyPem, encryptedBuffer);
-  assert.strictEqual(input, decryptedBuffer.toString());
+  assert.strictEqual(decryptedBuffer.toString(), input);
 
   encryptedBuffer = crypto.privateEncrypt(keyPem, bufferToEncrypt);
 
   decryptedBuffer = crypto.publicDecrypt(keyPem, encryptedBuffer);
-  assert.strictEqual(input, decryptedBuffer.toString());
+  assert.strictEqual(decryptedBuffer.toString(), input);
 
-  assert.throws(function() {
+  assert.throws(() => {
     crypto.privateDecrypt({
       key: rsaKeyPemEncrypted,
       passphrase: 'wrong'
     }, bufferToEncrypt);
-  });
+  }, decryptError);
 
-  assert.throws(function() {
+  assert.throws(() => {
     crypto.publicEncrypt({
       key: rsaKeyPemEncrypted,
       passphrase: 'wrong'
     }, encryptedBuffer);
-  });
+  }, decryptError);
 
   encryptedBuffer = crypto.privateEncrypt({
     key: rsaKeyPemEncrypted,
     passphrase: Buffer.from('password')
   }, bufferToEncrypt);
 
-  assert.throws(function() {
+  assert.throws(() => {
     crypto.publicDecrypt({
       key: rsaKeyPemEncrypted,
       passphrase: [].concat.apply([], Buffer.from('password'))
     }, encryptedBuffer);
-  });
+  }, decryptError);
 }
 
 function test_rsa(padding) {
-  const input = Buffer
-      .allocUnsafe(padding === 'RSA_NO_PADDING' ? 1024 / 8 : 32);
+  const size = (padding === 'RSA_NO_PADDING') ? 1024 / 8 : 32;
+  const input = Buffer.allocUnsafe(size);
   for (let i = 0; i < input.length; i++)
     input[i] = (i * 7 + 11) & 0xff;
   const bufferToEncrypt = Buffer.from(input);
@@ -124,7 +127,7 @@ function test_rsa(padding) {
     key: rsaKeyPem,
     padding: padding
   }, encryptedBuffer);
-  assert.strictEqual(input.toString(), decryptedBuffer.toString());
+  assert.deepStrictEqual(decryptedBuffer, input);
 }
 
 test_rsa('RSA_NO_PADDING');
@@ -137,42 +140,39 @@ let rsaVerify = crypto.createVerify('RSA-SHA1');
 assert.ok(rsaSign);
 assert.ok(rsaVerify);
 
+const expectedSignature =
+      '5c50e3145c4e2497aadb0eabc83b342d0b0021ece0d4c4a064b7c' +
+      '8f020d7e2688b122bfb54c724ac9ee169f83f66d2fe90abeb95e8' +
+      'e1290e7e177152a4de3d944cf7d4883114a20ed0f78e70e25ef0f' +
+      '60f06b858e6af42a2f276ede95bbc6bc9a9bbdda15bd663186a6f' +
+      '40819a7af19e577bb2efa5e579a1f5ce8a0d4ca8b8f6';
+
 rsaSign.update(rsaPubPem);
 let rsaSignature = rsaSign.sign(rsaKeyPem, 'hex');
-assert.strictEqual(rsaSignature,
-                   '5c50e3145c4e2497aadb0eabc83b342d0b0021ece0d4c4a064b7c' +
-             '8f020d7e2688b122bfb54c724ac9ee169f83f66d2fe90abeb95e8' +
-             'e1290e7e177152a4de3d944cf7d4883114a20ed0f78e70e25ef0f' +
-             '60f06b858e6af42a2f276ede95bbc6bc9a9bbdda15bd663186a6f' +
-             '40819a7af19e577bb2efa5e579a1f5ce8a0d4ca8b8f6');
+assert.strictEqual(rsaSignature, expectedSignature);
 
 rsaVerify.update(rsaPubPem);
 assert.strictEqual(rsaVerify.verify(rsaPubPem, rsaSignature, 'hex'), true);
 
 // Test RSA key signing/verification with encrypted key
 rsaSign = crypto.createSign('RSA-SHA1');
 rsaSign.update(rsaPubPem);
-assert.doesNotThrow(function() {
+assert.doesNotThrow(() => {
   const signOptions = { key: rsaKeyPemEncrypted, passphrase: 'password' };
   rsaSignature = rsaSign.sign(signOptions, 'hex');
 });
-assert.strictEqual(rsaSignature,
-                   '5c50e3145c4e2497aadb0eabc83b342d0b0021ece0d4c4a064b7c' +
-             '8f020d7e2688b122bfb54c724ac9ee169f83f66d2fe90abeb95e8' +
-             'e1290e7e177152a4de3d944cf7d4883114a20ed0f78e70e25ef0f' +
-             '60f06b858e6af42a2f276ede95bbc6bc9a9bbdda15bd663186a6f' +
-             '40819a7af19e577bb2efa5e579a1f5ce8a0d4ca8b8f6');
+assert.strictEqual(rsaSignature, expectedSignature);
 
 rsaVerify = crypto.createVerify('RSA-SHA1');
 rsaVerify.update(rsaPubPem);
 assert.strictEqual(rsaVerify.verify(rsaPubPem, rsaSignature, 'hex'), true);
 
 rsaSign = crypto.createSign('RSA-SHA1');
 rsaSign.update(rsaPubPem);
-assert.throws(function() {
+assert.throws(() => {
   const signOptions = { key: rsaKeyPemEncrypted, passphrase: 'wrong' };
   rsaSign.sign(signOptions, 'hex');
-});
+}, decryptError);
 
 //
 // Test RSA signing and verification
@@ -197,7 +197,7 @@ assert.throws(function() {
   sign.update(input);
 
   const output = sign.sign(privateKey, 'hex');
-  assert.strictEqual(output, signature);
+  assert.strictEqual(signature, output);
 
   const verify = crypto.createVerify('RSA-SHA256');
   verify.update(input);
@@ -233,9 +233,9 @@ const input = 'I AM THE WALRUS';
 {
   const sign = crypto.createSign('DSS1');
   sign.update(input);
-  assert.throws(function() {
+  assert.throws(() => {
     sign.sign({ key: dsaKeyPemEncrypted, passphrase: 'wrong' }, 'hex');
-  });
+  }, decryptError);
 }
 
 {
@@ -245,7 +245,7 @@ const input = 'I AM THE WALRUS';
   sign.update(input);
 
   let signature;
-  assert.doesNotThrow(function() {
+  assert.doesNotThrow(() => {
     const signOptions = { key: dsaKeyPemEncrypted, passphrase: 'password' };
     signature = sign.sign(signOptions, 'hex');
   });