diff --git a/bench/snippets/path-parse.mjs b/bench/snippets/path-parse.mjs
new file mode 100644
index 0000000000..414d3e7e9a
--- /dev/null
+++ b/bench/snippets/path-parse.mjs
@@ -0,0 +1,18 @@
+import { posix, win32 } from "path";
+import { bench, run } from "../runner.mjs";
+
+const paths = ["/home/user/dir/file.txt", "/home/user/dir/", "file.txt", "/root", ""];
+
+paths.forEach(p => {
+  bench(`posix.parse(${JSON.stringify(p)})`, () => {
+    globalThis.abc = posix.parse(p);
+  });
+});
+
+paths.forEach(p => {
+  bench(`win32.parse(${JSON.stringify(p)})`, () => {
+    globalThis.abc = win32.parse(p);
+  });
+});
+
+await run();
diff --git a/src/StandaloneModuleGraph.zig b/src/StandaloneModuleGraph.zig
index 3985a6aee6..dd63115ee9 100644
--- a/src/StandaloneModuleGraph.zig
+++ b/src/StandaloneModuleGraph.zig
@@ -935,7 +935,7 @@ pub const StandaloneModuleGraph = struct {
 
                 var remain = bytes;
                 while (remain.len > 0) {
-                    switch (Syscall.write(cloned_executable_fd, bytes)) {
+                    switch (Syscall.write(cloned_executable_fd, remain)) {
                         .result => |written| remain = remain[written..],
                         .err => |err| {
                             Output.prettyErrorln("<r><red>error<r><d>:<r> failed to write to temporary file\n{f}", .{err});
diff --git a/src/bun.js/bindings/Path.cpp b/src/bun.js/bindings/Path.cpp
index d8b110a425..3578ba23c9 100644
--- a/src/bun.js/bindings/Path.cpp
+++ b/src/bun.js/bindings/Path.cpp
@@ -114,6 +114,25 @@ static JSC::JSObject* createPath(JSGlobalObject* globalThis, bool isWindows)
 
 } // namespace Zig
 
+extern "C" JSC::EncodedJSValue PathParsedObject__create(
+    JSC::JSGlobalObject* globalObject,
+    JSC::EncodedJSValue root,
+    JSC::EncodedJSValue dir,
+    JSC::EncodedJSValue base,
+    JSC::EncodedJSValue ext,
+    JSC::EncodedJSValue name)
+{
+    auto* global = JSC::jsCast<Zig::GlobalObject*>(globalObject);
+    auto& vm = JSC::getVM(globalObject);
+    JSC::JSObject* result = JSC::constructEmptyObject(vm, global->pathParsedObjectStructure());
+    result->putDirectOffset(vm, 0, JSC::JSValue::decode(root));
+    result->putDirectOffset(vm, 1, JSC::JSValue::decode(dir));
+    result->putDirectOffset(vm, 2, JSC::JSValue::decode(base));
+    result->putDirectOffset(vm, 3, JSC::JSValue::decode(ext));
+    result->putDirectOffset(vm, 4, JSC::JSValue::decode(name));
+    return JSC::JSValue::encode(result);
+}
+
 namespace Bun {
 
 JSC::JSValue createNodePathBinding(Zig::GlobalObject* globalObject)
diff --git a/src/bun.js/bindings/ZigGlobalObject.cpp b/src/bun.js/bindings/ZigGlobalObject.cpp
index 31373b7359..9cb9399815 100644
--- a/src/bun.js/bindings/ZigGlobalObject.cpp
+++ b/src/bun.js/bindings/ZigGlobalObject.cpp
@@ -2067,6 +2067,30 @@ void GlobalObject::finishCreation(VM& vm)
             init.set(structure);
         });
 
+    this->m_pathParsedObjectStructure.initLater(
+        [](const Initializer<Structure>& init) {
+            // { root, dir, base, ext, name } — path.parse() result
+            Structure* structure = init.owner->structureCache().emptyObjectStructureForPrototype(
+                init.owner, init.owner->objectPrototype(), 5);
+            PropertyOffset offset;
+            structure = Structure::addPropertyTransition(init.vm, structure,
+                Identifier::fromString(init.vm, "root"_s), 0, offset);
+            RELEASE_ASSERT(offset == 0);
+            structure = Structure::addPropertyTransition(init.vm, structure,
+                Identifier::fromString(init.vm, "dir"_s), 0, offset);
+            RELEASE_ASSERT(offset == 1);
+            structure = Structure::addPropertyTransition(init.vm, structure,
+                Identifier::fromString(init.vm, "base"_s), 0, offset);
+            RELEASE_ASSERT(offset == 2);
+            structure = Structure::addPropertyTransition(init.vm, structure,
+                Identifier::fromString(init.vm, "ext"_s), 0, offset);
+            RELEASE_ASSERT(offset == 3);
+            structure = Structure::addPropertyTransition(init.vm, structure,
+                init.vm.propertyNames->name, 0, offset);
+            RELEASE_ASSERT(offset == 4);
+            init.set(structure);
+        });
+
     this->m_pendingVirtualModuleResultStructure.initLater(
         [](const Initializer<Structure>& init) {
             init.set(Bun::PendingVirtualModuleResult::createStructure(init.vm, init.owner, init.owner->objectPrototype()));
diff --git a/src/bun.js/bindings/ZigGlobalObject.h b/src/bun.js/bindings/ZigGlobalObject.h
index 21c8d41f5c..5225b67ddd 100644
--- a/src/bun.js/bindings/ZigGlobalObject.h
+++ b/src/bun.js/bindings/ZigGlobalObject.h
@@ -567,6 +567,7 @@ public:
     V(public, LazyClassStructure, m_JSHTTPParserClassStructure)                                              \
                                                                                                              \
     V(private, LazyPropertyOfGlobalObject<Structure>, m_jsonlParseResultStructure)                           \
+    V(private, LazyPropertyOfGlobalObject<Structure>, m_pathParsedObjectStructure)                           \
     V(private, LazyPropertyOfGlobalObject<Structure>, m_pendingVirtualModuleResultStructure)                 \
     V(private, LazyPropertyOfGlobalObject<JSFunction>, m_performMicrotaskFunction)                           \
     V(private, LazyPropertyOfGlobalObject<JSFunction>, m_nativeMicrotaskTrampoline)                          \
@@ -702,6 +703,7 @@ public:
     void reload();
 
     JSC::Structure* jsonlParseResultStructure() { return m_jsonlParseResultStructure.get(this); }
+    JSC::Structure* pathParsedObjectStructure() { return m_pathParsedObjectStructure.get(this); }
     JSC::Structure* pendingVirtualModuleResultStructure() { return m_pendingVirtualModuleResultStructure.get(this); }
 
     // We need to know if the napi module registered itself or we registered it.
diff --git a/src/bun.js/node/path.zig b/src/bun.js/node/path.zig
index 6f2103c58f..76f09cf1dc 100644
--- a/src/bun.js/node/path.zig
+++ b/src/bun.js/node/path.zig
@@ -71,13 +71,12 @@ fn PathParsed(comptime T: type) type {
         name: []const T = "",
 
         pub fn toJSObject(this: @This(), globalObject: *jsc.JSGlobalObject) bun.JSError!jsc.JSValue {
-            var jsObject = jsc.JSValue.createEmptyObject(globalObject, 5);
-            jsObject.put(globalObject, jsc.ZigString.static("root"), try bun.String.createUTF8ForJS(globalObject, this.root));
-            jsObject.put(globalObject, jsc.ZigString.static("dir"), try bun.String.createUTF8ForJS(globalObject, this.dir));
-            jsObject.put(globalObject, jsc.ZigString.static("base"), try bun.String.createUTF8ForJS(globalObject, this.base));
-            jsObject.put(globalObject, jsc.ZigString.static("ext"), try bun.String.createUTF8ForJS(globalObject, this.ext));
-            jsObject.put(globalObject, jsc.ZigString.static("name"), try bun.String.createUTF8ForJS(globalObject, this.name));
-            return jsObject;
+            const root = try bun.String.createUTF8ForJS(globalObject, this.root);
+            const dir = try bun.String.createUTF8ForJS(globalObject, this.dir);
+            const base = try bun.String.createUTF8ForJS(globalObject, this.base);
+            const ext = try bun.String.createUTF8ForJS(globalObject, this.ext);
+            const name_val = try bun.String.createUTF8ForJS(globalObject, this.name);
+            return PathParsedObject__create(globalObject, root, dir, base, ext, name_val);
         }
     };
 }
@@ -2748,6 +2747,14 @@ pub fn resolveJS_T(comptime T: type, globalObject: *jsc.JSGlobalObject, allocato
 }
 
 extern "c" fn Process__getCachedCwd(*jsc.JSGlobalObject) jsc.JSValue;
+extern "c" fn PathParsedObject__create(
+    *jsc.JSGlobalObject,
+    jsc.JSValue,
+    jsc.JSValue,
+    jsc.JSValue,
+    jsc.JSValue,
+    jsc.JSValue,
+) jsc.JSValue;
 
 pub fn resolve(globalObject: *jsc.JSGlobalObject, isWindows: bool, args_ptr: [*]jsc.JSValue, args_len: u16) bun.JSError!jsc.JSValue {
     var arena = bun.ArenaAllocator.init(bun.default_allocator);
diff --git a/src/js/node/crypto.ts b/src/js/node/crypto.ts
index d6c3218b87..8b5edca9cf 100644
--- a/src/js/node/crypto.ts
+++ b/src/js/node/crypto.ts
@@ -199,18 +199,18 @@ function Sign(algorithm, options): void {
 }
 $toClass(Sign, "Sign", Writable);
 
-Sign.prototype._write = function _write(chunk, encoding, callback) {
-  this.update(chunk, encoding);
-  callback();
-};
-
-Sign.prototype.update = function update(data, encoding) {
-  return this[kHandle].update(this, data, encoding);
-};
-
-Sign.prototype.sign = function sign(options, encoding) {
-  return this[kHandle].sign(options, encoding);
-};
+Object.assign(Sign.prototype, {
+  _write: function (chunk, encoding, callback) {
+    this.update(chunk, encoding);
+    callback();
+  },
+  update: function (data, encoding) {
+    return this[kHandle].update(this, data, encoding);
+  },
+  sign: function (options, encoding) {
+    return this[kHandle].sign(options, encoding);
+  },
+});
 
 crypto_exports.Sign = Sign;
 crypto_exports.sign = sign;
@@ -237,9 +237,11 @@ $toClass(Verify, "Verify", Writable);
 Verify.prototype._write = Sign.prototype._write;
 Verify.prototype.update = Sign.prototype.update;
 
-Verify.prototype.verify = function verify(options, signature, sigEncoding) {
-  return this[kHandle].verify(options, signature, sigEncoding);
-};
+Object.assign(Verify.prototype, {
+  verify: function (options, signature, sigEncoding) {
+    return this[kHandle].verify(options, signature, sigEncoding);
+  },
+});
 
 crypto_exports.Verify = Verify;
 crypto_exports.verify = verify;
@@ -250,82 +252,76 @@ function createVerify(algorithm, options?) {
 
 crypto_exports.createVerify = createVerify;
 
-{
-  function Hash(algorithm, options?): void {
-    if (!new.target) {
-      return new Hash(algorithm, options);
-    }
-
-    const handle = new _Hash(algorithm, options);
-    this[kHandle] = handle;
-
-    LazyTransform.$apply(this, [options]);
+function Hash(algorithm, options?): void {
+  if (!new.target) {
+    return new Hash(algorithm, options);
   }
-  $toClass(Hash, "Hash", LazyTransform);
 
-  Hash.prototype.copy = function copy(options) {
+  const handle = new _Hash(algorithm, options);
+  this[kHandle] = handle;
+
+  LazyTransform.$apply(this, [options]);
+}
+$toClass(Hash, "Hash", LazyTransform);
+
+Object.assign(Hash.prototype, {
+  copy: function (options) {
     return new Hash(this[kHandle], options);
-  };
-
-  Hash.prototype._transform = function _transform(chunk, encoding, callback) {
+  },
+  _transform: function (chunk, encoding, callback) {
     this[kHandle].update(this, chunk, encoding);
     callback();
-  };
-
-  Hash.prototype._flush = function _flush(callback) {
+  },
+  _flush: function (callback) {
     this.push(this[kHandle].digest(null, false));
     callback();
-  };
-
-  Hash.prototype.update = function update(data, encoding) {
+  },
+  update: function (data, encoding) {
     return this[kHandle].update(this, data, encoding);
-  };
-
-  Hash.prototype.digest = function digest(outputEncoding) {
+  },
+  digest: function (outputEncoding) {
     return this[kHandle].digest(outputEncoding);
-  };
+  },
+});
 
-  crypto_exports.Hash = Hash;
-  crypto_exports.createHash = function createHash(algorithm, options) {
-    return new Hash(algorithm, options);
-  };
-}
+crypto_exports.Hash = Hash;
+crypto_exports.createHash = function createHash(algorithm, options) {
+  return new Hash(algorithm, options);
+};
 
-{
-  function Hmac(hmac, key, options?): void {
-    if (!new.target) {
-      return new Hmac(hmac, key, options);
-    }
-
-    const handle = new _Hmac(hmac, key, options);
-    this[kHandle] = handle;
-
-    LazyTransform.$apply(this, [options]);
+function Hmac(hmac, key, options?): void {
+  if (!new.target) {
+    return new Hmac(hmac, key, options);
   }
-  $toClass(Hmac, "Hmac", LazyTransform);
 
-  Hmac.prototype.update = function update(data, encoding) {
+  const handle = new _Hmac(hmac, key, options);
+  this[kHandle] = handle;
+
+  LazyTransform.$apply(this, [options]);
+}
+$toClass(Hmac, "Hmac", LazyTransform);
+
+Object.assign(Hmac.prototype, {
+  update: function (data, encoding) {
     return this[kHandle].update(this, data, encoding);
-  };
-
-  Hmac.prototype.digest = function digest(outputEncoding) {
+  },
+  digest: function (outputEncoding) {
     return this[kHandle].digest(outputEncoding);
-  };
-
-  Hmac.prototype._transform = function _transform(chunk, encoding, callback) {
+  },
+  _transform: function (chunk, encoding, callback) {
     this[kHandle].update(this, chunk, encoding);
     callback();
-  };
-  Hmac.prototype._flush = function _flush(callback) {
+  },
+  _flush: function (callback) {
     this.push(this[kHandle].digest());
     callback();
-  };
+  },
+});
 
-  crypto_exports.Hmac = Hmac;
-  crypto_exports.createHmac = function createHmac(hmac, key, options) {
-    return new Hmac(hmac, key, options);
-  };
-}
+crypto_exports.Hmac = Hmac;
+crypto_exports.createHmac = function createHmac(hmac, key, options) {
+  return new Hmac(hmac, key, options);
+};
 
 crypto_exports.getHashes = getHashes;
 
@@ -390,62 +386,6 @@ crypto_exports.createECDH = function createECDH(curve) {
     return decoder;
   }
 
-  function setAutoPadding(ap) {
-    this[kHandle].setAutoPadding(ap);
-    return this;
-  }
-
-  function getAuthTag() {
-    return this[kHandle].getAuthTag();
-  }
-
-  function setAuthTag(tagbuf, encoding) {
-    this[kHandle].setAuthTag(tagbuf, encoding);
-    return this;
-  }
-
-  function setAAD(aadbuf, options) {
-    this[kHandle].setAAD(aadbuf, options);
-    return this;
-  }
-
-  function _transform(chunk, encoding, callback) {
-    this.push(this[kHandle].update(chunk, encoding));
-    callback();
-  }
-
-  function _flush(callback) {
-    try {
-      this.push(this[kHandle].final());
-    } catch (e) {
-      callback(e);
-      return;
-    }
-    callback();
-  }
-
-  function update(data, inputEncoding, outputEncoding) {
-    const res = this[kHandle].update(data, inputEncoding);
-
-    if (outputEncoding && outputEncoding !== "buffer") {
-      this._decoder = getDecoder(this._decoder, outputEncoding);
-      return this._decoder.write(res);
-    }
-
-    return res;
-  }
-
-  function final(outputEncoding) {
-    const res = this[kHandle].final();
-
-    if (outputEncoding && outputEncoding !== "buffer") {
-      this._decoder = getDecoder(this._decoder, outputEncoding);
-      return this._decoder.end(res);
-    }
-
-    return res;
-  }
-
   function Cipheriv(cipher, key, iv, options): void {
     if (!new.target) {
       return new Cipheriv(cipher, key, iv, options);
@@ -457,13 +397,52 @@ crypto_exports.createECDH = function createECDH(curve) {
   }
   $toClass(Cipheriv, "Cipheriv", LazyTransform);
 
-  Cipheriv.prototype.setAutoPadding = setAutoPadding;
-  Cipheriv.prototype.getAuthTag = getAuthTag;
-  Cipheriv.prototype.setAAD = setAAD;
-  Cipheriv.prototype._transform = _transform;
-  Cipheriv.prototype._flush = _flush;
-  Cipheriv.prototype.update = update;
-  Cipheriv.prototype.final = final;
+  Object.assign(Cipheriv.prototype, {
+    setAutoPadding: function (ap) {
+      this[kHandle].setAutoPadding(ap);
+      return this;
+    },
+    getAuthTag: function () {
+      return this[kHandle].getAuthTag();
+    },
+    setAAD: function (aadbuf, options) {
+      this[kHandle].setAAD(aadbuf, options);
+      return this;
+    },
+    _transform: function (chunk, encoding, callback) {
+      this.push(this[kHandle].update(chunk, encoding));
+      callback();
+    },
+    _flush: function (callback) {
+      try {
+        this.push(this[kHandle].final());
+      } catch (e) {
+        callback(e);
+        return;
+      }
+      callback();
+    },
+    update: function (data, inputEncoding, outputEncoding) {
+      const res = this[kHandle].update(data, inputEncoding);
+
+      if (outputEncoding && outputEncoding !== "buffer") {
+        this._decoder = getDecoder(this._decoder, outputEncoding);
+        return this._decoder.write(res);
+      }
+
+      return res;
+    },
+    final: function (outputEncoding) {
+      const res = this[kHandle].final();
+
+      if (outputEncoding && outputEncoding !== "buffer") {
+        this._decoder = getDecoder(this._decoder, outputEncoding);
+        return this._decoder.end(res);
+      }
+
+      return res;
+    },
+  });
 
   function Decipheriv(cipher, key, iv, options): void {
     if (!new.target) {
@@ -476,13 +455,18 @@ crypto_exports.createECDH = function createECDH(curve) {
   }
   $toClass(Decipheriv, "Decipheriv", LazyTransform);
 
-  Decipheriv.prototype.setAutoPadding = setAutoPadding;
-  Decipheriv.prototype.setAuthTag = setAuthTag;
-  Decipheriv.prototype.setAAD = setAAD;
-  Decipheriv.prototype._transform = _transform;
-  Decipheriv.prototype._flush = _flush;
-  Decipheriv.prototype.update = update;
-  Decipheriv.prototype.final = final;
+  Object.assign(Decipheriv.prototype, {
+    setAutoPadding: Cipheriv.prototype.setAutoPadding,
+    setAuthTag: function (tagbuf, encoding) {
+      this[kHandle].setAuthTag(tagbuf, encoding);
+      return this;
+    },
+    setAAD: Cipheriv.prototype.setAAD,
+    _transform: Cipheriv.prototype._transform,
+    _flush: Cipheriv.prototype._flush,
+    update: Cipheriv.prototype.update,
+    final: Cipheriv.prototype.final,
+  });
 
   crypto_exports.Cipheriv = Cipheriv;
   crypto_exports.Decipheriv = Decipheriv;
diff --git a/src/sys.zig b/src/sys.zig
index 285878683d..cb606398f4 100644
--- a/src/sys.zig
+++ b/src/sys.zig
@@ -4092,6 +4092,12 @@ pub fn copyFileZSlowWithHandle(in_handle: bun.FileDescriptor, to_dir: bun.FileDe
             _ = std.os.linux.fallocate(out_handle.cast(), 0, 0, @intCast(stat_.size));
         }
 
+        // Seek input to beginning — the caller may have written to this fd,
+        // leaving the file offset at EOF. copy_file_range / sendfile / read
+        // all use the current offset when called with null offsets.
+        // Ignore errors: the fd may be non-seekable (e.g. a pipe).
+        _ = setFileOffset(in_handle, 0);
+
         switch (bun.copyFile(in_handle, out_handle)) {
             .err => |e| return .{ .err = e },
             .result => {},
diff --git a/test/bundler/bun-build-compile.test.ts b/test/bundler/bun-build-compile.test.ts
index 8004a7bb78..491e3b8438 100644
--- a/test/bundler/bun-build-compile.test.ts
+++ b/test/bundler/bun-build-compile.test.ts
@@ -121,4 +121,71 @@ describe("Bun.build compile", () => {
   });
 });
 
+describe("compiled binary validity", () => {
+  test("output binary has valid executable header", async () => {
+    using dir = tempDir("build-compile-valid-header", {
+      "app.js": `console.log("hello");`,
+    });
+
+    const outfile = join(dir + "", "app-out");
+    const result = await Bun.build({
+      entrypoints: [join(dir + "", "app.js")],
+      compile: {
+        outfile,
+      },
+    });
+
+    expect(result.success).toBe(true);
+
+    // Read the first 4 bytes and verify it's a valid executable magic number
+    const file = Bun.file(result.outputs[0].path);
+    const header = new Uint8Array(await file.slice(0, 4).arrayBuffer());
+
+    if (isMacOS) {
+      // MachO magic: 0xCFFAEDFE (little-endian)
+      expect(header[0]).toBe(0xcf);
+      expect(header[1]).toBe(0xfa);
+      expect(header[2]).toBe(0xed);
+      expect(header[3]).toBe(0xfe);
+    } else if (isLinux) {
+      // ELF magic: 0x7F 'E' 'L' 'F'
+      expect(header[0]).toBe(0x7f);
+      expect(header[1]).toBe(0x45); // 'E'
+      expect(header[2]).toBe(0x4c); // 'L'
+      expect(header[3]).toBe(0x46); // 'F'
+    } else if (isWindows) {
+      // PE magic: 'M' 'Z'
+      expect(header[0]).toBe(0x4d); // 'M'
+      expect(header[1]).toBe(0x5a); // 'Z'
+    }
+  });
+
+  test("compiled binary runs and produces expected output", async () => {
+    using dir = tempDir("build-compile-runs", {
+      "app.js": `console.log("compile-test-output");`,
+    });
+
+    const outfile = join(dir + "", "app-run");
+    const result = await Bun.build({
+      entrypoints: [join(dir + "", "app.js")],
+      compile: {
+        outfile,
+      },
+    });
+
+    expect(result.success).toBe(true);
+
+    await using proc = Bun.spawn({
+      cmd: [result.outputs[0].path],
+      stdout: "pipe",
+      stderr: "pipe",
+    });
+
+    const [stdout, stderr, exitCode] = await Promise.all([proc.stdout.text(), proc.stderr.text(), proc.exited]);
+
+    expect(stdout.trim()).toBe("compile-test-output");
+    expect(exitCode).toBe(0);
+  });
+});
+
 // file command test works well
diff --git a/test/js/node/crypto/node-crypto.test.js b/test/js/node/crypto/node-crypto.test.js
index 2316d0ba5e..9d6ea12efa 100644
--- a/test/js/node/crypto/node-crypto.test.js
+++ b/test/js/node/crypto/node-crypto.test.js
@@ -504,6 +504,110 @@ describe("Hash", () => {
     expect(hash.update.name).toBe("update");
     expect(hash.digest.name).toBe("digest");
     expect(hash.copy.name).toBe("copy");
+    expect(hash._transform.name).toBe("_transform");
+    expect(hash._flush.name).toBe("_flush");
+  });
+});
+
+describe("Hmac", () => {
+  it("should have correct method names", () => {
+    const hmac = crypto.createHmac("sha256", "key");
+    expect(hmac.update.name).toBe("update");
+    expect(hmac.digest.name).toBe("digest");
+    expect(hmac._transform.name).toBe("_transform");
+    expect(hmac._flush.name).toBe("_flush");
+  });
+});
+
+describe("Sign", () => {
+  it("should have correct method names", () => {
+    const sign = crypto.createSign("sha256");
+    expect(sign.update.name).toBe("update");
+    expect(sign.sign.name).toBe("sign");
+    expect(sign._write.name).toBe("_write");
+  });
+});
+
+describe("Verify", () => {
+  it("should have correct method names", () => {
+    const verify = crypto.createVerify("sha256");
+    expect(verify.update.name).toBe("update");
+    expect(verify.verify.name).toBe("verify");
+    expect(verify._write.name).toBe("_write");
+  });
+});
+
+describe("Cipheriv", () => {
+  it("should have correct method names", () => {
+    const cipher = crypto.createCipheriv("aes-256-cbc", Buffer.alloc(32), Buffer.alloc(16));
+    expect(cipher.update.name).toBe("update");
+    expect(cipher.final.name).toBe("final");
+    expect(cipher.setAutoPadding.name).toBe("setAutoPadding");
+    expect(cipher.getAuthTag.name).toBe("getAuthTag");
+    expect(cipher.setAAD.name).toBe("setAAD");
+    expect(cipher._transform.name).toBe("_transform");
+    expect(cipher._flush.name).toBe("_flush");
+  });
+});
+
+describe("Decipheriv", () => {
+  it("should have correct method names", () => {
+    const decipher = crypto.createDecipheriv("aes-256-cbc", Buffer.alloc(32), Buffer.alloc(16));
+    expect(decipher.update.name).toBe("update");
+    expect(decipher.final.name).toBe("final");
+    expect(decipher.setAutoPadding.name).toBe("setAutoPadding");
+    expect(decipher.setAuthTag.name).toBe("setAuthTag");
+    expect(decipher.setAAD.name).toBe("setAAD");
+    expect(decipher._transform.name).toBe("_transform");
+    expect(decipher._flush.name).toBe("_flush");
+  });
+});
+
+describe("DiffieHellman", () => {
+  it("should have correct method names", () => {
+    const dh = crypto.createDiffieHellman(512);
+    expect(dh.generateKeys.name).toBe("generateKeys");
+    expect(dh.computeSecret.name).toBe("computeSecret");
+    expect(dh.getPrime.name).toBe("getPrime");
+    expect(dh.getGenerator.name).toBe("getGenerator");
+    expect(dh.getPublicKey.name).toBe("getPublicKey");
+    expect(dh.getPrivateKey.name).toBe("getPrivateKey");
+    expect(dh.setPublicKey.name).toBe("setPublicKey");
+    expect(dh.setPrivateKey.name).toBe("setPrivateKey");
+  });
+});
+
+describe("ECDH", () => {
+  it("should have correct method names", () => {
+    const ecdh = crypto.createECDH("prime256v1");
+    expect(ecdh.generateKeys.name).toBe("generateKeys");
+    expect(ecdh.computeSecret.name).toBe("computeSecret");
+    expect(ecdh.getPublicKey.name).toBe("getPublicKey");
+    expect(ecdh.getPrivateKey.name).toBe("getPrivateKey");
+    expect(ecdh.setPublicKey.name).toBe("setPublicKey");
+    expect(ecdh.setPrivateKey.name).toBe("setPrivateKey");
+  });
+});
+
+describe("crypto module", () => {
+  it("should have correct factory function names", () => {
+    expect(crypto.createHash.name).toBe("createHash");
+    expect(crypto.createHmac.name).toBe("createHmac");
+    expect(crypto.createSign.name).toBe("createSign");
+    expect(crypto.createVerify.name).toBe("createVerify");
+    expect(crypto.createCipheriv.name).toBe("createCipheriv");
+    expect(crypto.createDecipheriv.name).toBe("createDecipheriv");
+    expect(crypto.createDiffieHellman.name).toBe("createDiffieHellman");
+    expect(crypto.createECDH.name).toBe("createECDH");
+    expect(crypto.hash.name).toBe("hash");
+    expect(crypto.pbkdf2.name).toBe("pbkdf2");
+  });
+
+  it("should have correct constructor names", () => {
+    expect(crypto.Hash.name).toBe("Hash");
+    expect(crypto.Hmac.name).toBe("Hmac");
+    expect(crypto.Sign.name).toBe("Sign");
+    expect(crypto.Verify.name).toBe("Verify");
   });
 });