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diff --git a/src/bun.js/bindings/webcrypto/CommonCryptoDERUtilities.h b/src/bun.js/bindings/webcrypto/CommonCryptoDERUtilities.h
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+++ b/src/bun.js/bindings/webcrypto/CommonCryptoDERUtilities.h
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+/*
+ * Copyright (C) 2017 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <wtf/Vector.h>
+
+#if ENABLE(WEB_CRYPTO)
+
+// FIXME: <rdar://problem/31618371>
+// The following constants and functions are for customized DER implementations.
+// They are not intended to be used outside Crypto codes, and should be removed
+// once the above bug is fixed.
+namespace WebCore {
+
+// Per X.690 08/2015: https://www.itu.int/rec/T-REC-X.680-X.693/en
+static const unsigned char BitStringMark = 0x03;
+static const unsigned char IntegerMark = 0x02;
+static const unsigned char OctetStringMark = 0x04;
+static const unsigned char SequenceMark = 0x30;
+// Version 0. Per https://tools.ietf.org/html/rfc5208#section-5
+static const unsigned char Version[] = {0x02, 0x01, 0x00};
+
+static const unsigned char InitialOctet = 0x00;
+static const size_t MaxLengthInOneByte = 128;
+
+size_t bytesUsedToEncodedLength(uint8_t);
+size_t extraBytesNeededForEncodedLength(size_t);
+void addEncodedASN1Length(Vector<uint8_t>&, size_t);
+size_t bytesNeededForEncodedLength(size_t);
+
+} // namespace WebCore
+
+#endif // ENABLE(WEB_CRYPTO)