diff --git a/benchmark/crypto/aes-gcm-throughput.js b/benchmark/crypto/aes-gcm-throughput.js
index 246455de78ad88..5c1e71e7280575 100644
--- a/benchmark/crypto/aes-gcm-throughput.js
+++ b/benchmark/crypto/aes-gcm-throughput.js
@@ -8,13 +8,13 @@ const bench = common.createBenchmark(main, {
   len: [1024, 4 * 1024, 16 * 1024, 64 * 1024, 256 * 1024, 1024 * 1024]
 });
 
-function main(conf) {
-  const message = Buffer.alloc(conf.len, 'b');
-  const key = crypto.randomBytes(keylen[conf.cipher]);
+function main({ n, len, cipher }) {
+  const message = Buffer.alloc(len, 'b');
+  const key = crypto.randomBytes(keylen[cipher]);
   const iv = crypto.randomBytes(12);
   const associate_data = Buffer.alloc(16, 'z');
   bench.start();
-  AEAD_Bench(conf.cipher, message, associate_data, key, iv, conf.n, conf.len);
+  AEAD_Bench(cipher, message, associate_data, key, iv, n, len);
 }
 
 function AEAD_Bench(cipher, message, associate_data, key, iv, n, len) {
diff --git a/benchmark/crypto/cipher-stream.js b/benchmark/crypto/cipher-stream.js
index ca36bd736d9aea..64f6ff7b7292be 100644
--- a/benchmark/crypto/cipher-stream.js
+++ b/benchmark/crypto/cipher-stream.js
@@ -9,8 +9,7 @@ const bench = common.createBenchmark(main, {
   api: ['legacy', 'stream']
 });
 
-function main(conf) {
-  var api = conf.api;
+function main({ api, cipher, type, len, writes }) {
   if (api === 'stream' && /^v0\.[0-8]\./.test(process.version)) {
     console.error('Crypto streams not available until v0.10');
     // use the legacy, just so that we can compare them.
@@ -33,25 +32,25 @@ function main(conf) {
   // alice_secret and bob_secret should be the same
   assert(alice_secret === bob_secret);
 
-  const alice_cipher = crypto.createCipher(conf.cipher, alice_secret);
-  const bob_cipher = crypto.createDecipher(conf.cipher, bob_secret);
+  const alice_cipher = crypto.createCipher(cipher, alice_secret);
+  const bob_cipher = crypto.createDecipher(cipher, bob_secret);
 
   var message;
   var encoding;
-  switch (conf.type) {
+  switch (type) {
     case 'asc':
-      message = 'a'.repeat(conf.len);
+      message = 'a'.repeat(len);
       encoding = 'ascii';
       break;
     case 'utf':
-      message = 'ü'.repeat(conf.len / 2);
+      message = 'ü'.repeat(len / 2);
       encoding = 'utf8';
       break;
     case 'buf':
-      message = Buffer.alloc(conf.len, 'b');
+      message = Buffer.alloc(len, 'b');
       break;
     default:
-      throw new Error(`unknown message type: ${conf.type}`);
+      throw new Error(`unknown message type: ${type}`);
   }
 
   const fn = api === 'stream' ? streamWrite : legacyWrite;
@@ -59,7 +58,7 @@ function main(conf) {
   // write data as fast as possible to alice, and have bob decrypt.
   // use old API for comparison to v0.8
   bench.start();
-  fn(alice_cipher, bob_cipher, message, encoding, conf.writes);
+  fn(alice_cipher, bob_cipher, message, encoding, writes);
 }
 
 function streamWrite(alice, bob, message, encoding, writes) {
diff --git a/benchmark/crypto/get-ciphers.js b/benchmark/crypto/get-ciphers.js
index 3f5ad17ad38716..d4c10a2427d360 100644
--- a/benchmark/crypto/get-ciphers.js
+++ b/benchmark/crypto/get-ciphers.js
@@ -7,12 +7,10 @@ const bench = common.createBenchmark(main, {
   v: ['crypto', 'tls']
 });
 
-function main(conf) {
-  const n = +conf.n;
-  const v = conf.v;
+function main({ n, v }) {
   const method = require(v).getCiphers;
   var i = 0;
-  // first call to getChipers will dominate the results
+  // First call to getChipers will dominate the results
   if (n > 1) {
     for (; i < n; i++)
       method();
diff --git a/benchmark/crypto/hash-stream-creation.js b/benchmark/crypto/hash-stream-creation.js
index 5ac5a4f70b5c55..faaa12a9e5d484 100644
--- a/benchmark/crypto/hash-stream-creation.js
+++ b/benchmark/crypto/hash-stream-creation.js
@@ -13,8 +13,7 @@ const bench = common.createBenchmark(main, {
   api: ['legacy', 'stream']
 });
 
-function main(conf) {
-  var api = conf.api;
+function main({ api, type, len, out, writes, algo }) {
   if (api === 'stream' && /^v0\.[0-8]\./.test(process.version)) {
     console.error('Crypto streams not available until v0.10');
     // use the legacy, just so that we can compare them.
@@ -23,26 +22,26 @@ function main(conf) {
 
   var message;
   var encoding;
-  switch (conf.type) {
+  switch (type) {
     case 'asc':
-      message = 'a'.repeat(conf.len);
+      message = 'a'.repeat(len);
       encoding = 'ascii';
       break;
     case 'utf':
-      message = 'ü'.repeat(conf.len / 2);
+      message = 'ü'.repeat(len / 2);
       encoding = 'utf8';
       break;
     case 'buf':
-      message = Buffer.alloc(conf.len, 'b');
+      message = Buffer.alloc(len, 'b');
       break;
     default:
-      throw new Error(`unknown message type: ${conf.type}`);
+      throw new Error(`unknown message type: ${type}`);
   }
 
   const fn = api === 'stream' ? streamWrite : legacyWrite;
 
   bench.start();
-  fn(conf.algo, message, encoding, conf.writes, conf.len, conf.out);
+  fn(algo, message, encoding, writes, len, out);
 }
 
 function legacyWrite(algo, message, encoding, writes, len, outEnc) {
diff --git a/benchmark/crypto/hash-stream-throughput.js b/benchmark/crypto/hash-stream-throughput.js
index 21ec3c7902b367..934e7a0b11bdae 100644
--- a/benchmark/crypto/hash-stream-throughput.js
+++ b/benchmark/crypto/hash-stream-throughput.js
@@ -12,8 +12,7 @@ const bench = common.createBenchmark(main, {
   api: ['legacy', 'stream']
 });
 
-function main(conf) {
-  var api = conf.api;
+function main({ api, type, len, algo, writes }) {
   if (api === 'stream' && /^v0\.[0-8]\./.test(process.version)) {
     console.error('Crypto streams not available until v0.10');
     // use the legacy, just so that we can compare them.
@@ -22,26 +21,26 @@ function main(conf) {
 
   var message;
   var encoding;
-  switch (conf.type) {
+  switch (type) {
     case 'asc':
-      message = 'a'.repeat(conf.len);
+      message = 'a'.repeat(len);
       encoding = 'ascii';
       break;
     case 'utf':
-      message = 'ü'.repeat(conf.len / 2);
+      message = 'ü'.repeat(len / 2);
       encoding = 'utf8';
       break;
     case 'buf':
-      message = Buffer.alloc(conf.len, 'b');
+      message = Buffer.alloc(len, 'b');
       break;
     default:
-      throw new Error(`unknown message type: ${conf.type}`);
+      throw new Error(`unknown message type: ${type}`);
   }
 
   const fn = api === 'stream' ? streamWrite : legacyWrite;
 
   bench.start();
-  fn(conf.algo, message, encoding, conf.writes, conf.len);
+  fn(algo, message, encoding, writes, len);
 }
 
 function legacyWrite(algo, message, encoding, writes, len) {
diff --git a/benchmark/crypto/rsa-encrypt-decrypt-throughput.js b/benchmark/crypto/rsa-encrypt-decrypt-throughput.js
index edab5ae08f7d63..40b69c31f977ca 100644
--- a/benchmark/crypto/rsa-encrypt-decrypt-throughput.js
+++ b/benchmark/crypto/rsa-encrypt-decrypt-throughput.js
@@ -22,10 +22,10 @@ const bench = common.createBenchmark(main, {
   len: [16, 32, 64]
 });
 
-function main(conf) {
-  const message = Buffer.alloc(conf.len, 'b');
+function main({ len, algo, keylen, n }) {
+  const message = Buffer.alloc(len, 'b');
   bench.start();
-  StreamWrite(conf.algo, conf.keylen, message, conf.n, conf.len);
+  StreamWrite(algo, keylen, message, n, len);
 }
 
 function StreamWrite(algo, keylen, message, n, len) {
diff --git a/benchmark/crypto/rsa-sign-verify-throughput.js b/benchmark/crypto/rsa-sign-verify-throughput.js
index bcde3a43d4d77a..3a0373b57d0bba 100644
--- a/benchmark/crypto/rsa-sign-verify-throughput.js
+++ b/benchmark/crypto/rsa-sign-verify-throughput.js
@@ -23,10 +23,10 @@ const bench = common.createBenchmark(main, {
   len: [1024, 102400, 2 * 102400, 3 * 102400, 1024 * 1024]
 });
 
-function main(conf) {
-  const message = Buffer.alloc(conf.len, 'b');
+function main({ len, algo, keylen, writes }) {
+  const message = Buffer.alloc(len, 'b');
   bench.start();
-  StreamWrite(conf.algo, conf.keylen, message, conf.writes, conf.len);
+  StreamWrite(algo, keylen, message, writes, len);
 }
 
 function StreamWrite(algo, keylen, message, writes, len) {