crypto: remove unused C++ parameter in sign/verify

Removes code in node_crypto.cc in Sign::SignFinal and
Verify::VerifyFinal which allowed to convert between buffers and
strings based on given encodings. The code is unused as crypto.js
only passes in and expects buffers and does the conversion itself.
The encoding parameter was removed from both methods.

PR-URL: https://github.com/nodejs/node/pull/12397
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

lib/crypto.js

@@ -326,7 +326,7 @@ Sign.prototype.sign = function sign(options, encoding) {
     }
   }
 
-  var ret = this._handle.sign(toBuf(key), null, passphrase, rsaPadding,
+  var ret = this._handle.sign(toBuf(key), passphrase, rsaPadding,
                               pssSaltLength);
 
   encoding = encoding || exports.DEFAULT_ENCODING;
@@ -376,7 +376,7 @@ Verify.prototype.verify = function verify(options, signature, sigEncoding) {
     }
   }
 
-  return this._handle.verify(toBuf(key), toBuf(signature, sigEncoding), null,
+  return this._handle.verify(toBuf(key), toBuf(signature, sigEncoding),
                              rsaPadding, pssSaltLength);
 };
 

src/node_crypto.cc

@@ -4194,24 +4194,20 @@ void Sign::SignFinal(const FunctionCallbackInfo<Value>& args) {
   unsigned int md_len;
 
   unsigned int len = args.Length();
-  enum encoding encoding = BUFFER;
-  if (len >= 2) {
-    encoding = ParseEncoding(env->isolate(), args[1], BUFFER);
-  }
 
-  node::Utf8Value passphrase(env->isolate(), args[2]);
+  node::Utf8Value passphrase(env->isolate(), args[1]);
 
   THROW_AND_RETURN_IF_NOT_BUFFER(args[0], "Data");
   size_t buf_len = Buffer::Length(args[0]);
   char* buf = Buffer::Data(args[0]);
 
-  CHECK(args[3]->IsInt32());
-  Maybe<int32_t> maybe_padding = args[3]->Int32Value(env->context());
+  CHECK(args[2]->IsInt32());
+  Maybe<int32_t> maybe_padding = args[2]->Int32Value(env->context());
   CHECK(maybe_padding.IsJust());
   int padding = maybe_padding.ToChecked();
 
-  CHECK(args[4]->IsInt32());
-  Maybe<int32_t> maybe_salt_len = args[4]->Int32Value(env->context());
+  CHECK(args[3]->IsInt32());
+  Maybe<int32_t> maybe_salt_len = args[3]->Int32Value(env->context());
   CHECK(maybe_salt_len.IsJust());
   int salt_len = maybe_salt_len.ToChecked();
 
@@ -4224,7 +4220,7 @@ void Sign::SignFinal(const FunctionCallbackInfo<Value>& args) {
   Error err = sign->SignFinal(
       buf,
       buf_len,
-      len >= 3 && !args[2]->IsNull() ? *passphrase : nullptr,
+      len >= 2 && !args[1]->IsNull() ? *passphrase : nullptr,
       &md_value,
       &md_len,
       padding,
@@ -4236,10 +4232,9 @@ void Sign::SignFinal(const FunctionCallbackInfo<Value>& args) {
     return sign->CheckThrow(err);
   }
 
-  Local<Value> rc = StringBytes::Encode(env->isolate(),
-                                        reinterpret_cast<const char*>(md_value),
-                                        md_len,
-                                        encoding);
+  Local<Object> rc = Buffer::Copy(env->isolate(),
+                                  reinterpret_cast<const char*>(md_value),
+                                  md_len).ToLocalChecked();
   delete[] md_value;
   args.GetReturnValue().Set(rc);
 }
@@ -4442,42 +4437,22 @@ void Verify::VerifyFinal(const FunctionCallbackInfo<Value>& args) {
 
   THROW_AND_RETURN_IF_NOT_STRING_OR_BUFFER(args[1], "Hash");
 
-  enum encoding encoding = UTF8;
-  if (args.Length() >= 3) {
-    encoding = ParseEncoding(env->isolate(), args[2], UTF8);
-  }
-
-  ssize_t hlen = StringBytes::Size(env->isolate(), args[1], encoding);
-
-  // only copy if we need to, because it's a string.
-  char* hbuf;
-  if (args[1]->IsString()) {
-    hbuf = new char[hlen];
-    ssize_t hwritten = StringBytes::Write(env->isolate(),
-                                          hbuf,
-                                          hlen,
-                                          args[1],
-                                          encoding);
-    CHECK_EQ(hwritten, hlen);
-  } else {
-    hbuf = Buffer::Data(args[1]);
-  }
+  char* hbuf = Buffer::Data(args[1]);
+  ssize_t hlen = Buffer::Length(args[1]);
 
-  CHECK(args[3]->IsInt32());
-  Maybe<int32_t> maybe_padding = args[3]->Int32Value(env->context());
+  CHECK(args[2]->IsInt32());
+  Maybe<int32_t> maybe_padding = args[2]->Int32Value(env->context());
   CHECK(maybe_padding.IsJust());
   int padding = maybe_padding.ToChecked();
 
-  CHECK(args[4]->IsInt32());
-  Maybe<int32_t> maybe_salt_len = args[4]->Int32Value(env->context());
+  CHECK(args[3]->IsInt32());
+  Maybe<int32_t> maybe_salt_len = args[3]->Int32Value(env->context());
   CHECK(maybe_salt_len.IsJust());
   int salt_len = maybe_salt_len.ToChecked();
 
   bool verify_result;
   Error err = verify->VerifyFinal(kbuf, klen, hbuf, hlen, padding, salt_len,
                                   &verify_result);
-  if (args[1]->IsString())
-    delete[] hbuf;
   if (err != kSignOk)
     return verify->CheckThrow(err);
   args.GetReturnValue().Set(verify_result);