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diff --git a/src/bun.js/bindings/webcrypto/OpenSSLUtilities.h b/src/bun.js/bindings/webcrypto/OpenSSLUtilities.h
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+++ b/src/bun.js/bindings/webcrypto/OpenSSLUtilities.h
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+/*
+ * Copyright (C) 2021 Sony Interactive Entertainment Inc.
+ *
+ * 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 "CryptoAlgorithmIdentifier.h"
+#include "OpenSSLCryptoUniquePtr.h"
+#include <openssl/aes.h>
+#include <openssl/evp.h>
+#include <stdint.h>
+#include <wtf/Noncopyable.h>
+#include <wtf/Vector.h>
+
+#if ENABLE(WEB_CRYPTO)
+
+namespace WebCore {
+
+const EVP_MD* digestAlgorithm(CryptoAlgorithmIdentifier hashFunction);
+
+std::optional<Vector<uint8_t>> calculateDigest(const EVP_MD* algorithm, const Vector<uint8_t>& message);
+
+Vector<uint8_t> convertToBytes(const BIGNUM*);
+
+Vector<uint8_t> convertToBytesExpand(const BIGNUM*, size_t bufferSize);
+
+BIGNUMPtr convertToBigNumber(const Vector<uint8_t>& bytes);
+
+class AESKey {
+    WTF_MAKE_NONCOPYABLE(AESKey);
+public:
+    AESKey() = default;
+    ~AESKey();
+
+    bool setKey(const Vector<uint8_t>& key, int enc /* AES_ENCRYPT or AES_DECRYPT */);
+
+    AES_KEY* key() { return &m_key; }
+private:
+    AES_KEY m_key;
+};
+
+} // namespace WebCore
+
+#endif // ENABLE(WEB_CRYPTO)