doc: update tls test to use better terminology

Given the effort to change the master branch to main,
this may make sense as part of removing other references
to the offending wording as well.

Signed-off-by: Michael Dawson <mdawson@devrus.com>

PR-URL: #36851
Reviewed-By: Gerhard Stöbich <deb2001-github@yahoo.de>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

test/common/tls.js

@@ -15,9 +15,9 @@ class TestTLSSocket extends net.Socket {
     this.handshake_list = [];
     // AES128-GCM-SHA256
     this.ciphers = Buffer.from('000002009c0', 'hex');
-    this.pre_master_secret =
+    this.pre_primary_secret =
       Buffer.concat([this.version, crypto.randomBytes(46)]);
-    this.master_secret = null;
+    this.primary_secret = null;
     this.write_seq = 0;
     this.client_random = crypto.randomBytes(32);
 
@@ -26,12 +26,12 @@ class TestTLSSocket extends net.Socket {
     });
 
     this.on('server_random', (server_random) => {
-      this.master_secret = PRF12('sha256', this.pre_master_secret,
-                                 'master secret',
-                                 Buffer.concat([this.client_random,
-                                                server_random]),
-                                 48);
-      const key_block = PRF12('sha256', this.master_secret,
+      this.primary_secret = PRF12('sha256', this.pre_primary_secret,
+                                  'primary secret',
+                                  Buffer.concat([this.client_random,
+                                                 server_random]),
+                                  48);
+      const key_block = PRF12('sha256', this.primary_secret,
                               'key expansion',
                               Buffer.concat([server_random,
                                              this.client_random]),
@@ -51,14 +51,14 @@ class TestTLSSocket extends net.Socket {
   }
 
   createClientKeyExchange() {
-    const encrypted_pre_master_secret = crypto.publicEncrypt({
+    const encrypted_pre_primary_secret = crypto.publicEncrypt({
       key: this.server_cert,
       padding: crypto.constants.RSA_PKCS1_PADDING
-    }, this.pre_master_secret);
+    }, this.pre_primary_secret);
     const length = Buffer.alloc(2);
-    length.writeUIntBE(encrypted_pre_master_secret.length, 0, 2);
+    length.writeUIntBE(encrypted_pre_primary_secret.length, 0, 2);
     const msg = addHandshakeHeader(0x10, Buffer.concat([
-      length, encrypted_pre_master_secret]));
+      length, encrypted_pre_primary_secret]));
     this.emit('handshake', msg);
     return addRecordHeader(0x16, msg);
   }
@@ -67,7 +67,7 @@ class TestTLSSocket extends net.Socket {
     const shasum = crypto.createHash('sha256');
     shasum.update(Buffer.concat(this.handshake_list));
     const message_hash = shasum.digest();
-    const r = PRF12('sha256', this.master_secret,
+    const r = PRF12('sha256', this.primary_secret,
                     'client finished', message_hash, 12);
     const msg = addHandshakeHeader(0x14, r);
     this.emit('handshake', msg);