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diff --git a/dom/crypto/KeyAlgorithmProxy.h b/dom/crypto/KeyAlgorithmProxy.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_KeyAlgorithmProxy_h
+#define mozilla_dom_KeyAlgorithmProxy_h
+
+#include <cstdint>
+#include <utility>
+#include "js/RootingAPI.h"
+#include "mozilla/dom/CryptoBuffer.h"
+#include "mozilla/dom/KeyAlgorithmBinding.h"
+#include "mozilla/dom/TypedArray.h"
+#include "mozilla/dom/WebCryptoCommon.h"
+#include "nsLiteralString.h"
+#include "nsStringFwd.h"
+#include "pkcs11t.h"
+
+class JSObject;
+struct JSContext;
+struct JSStructuredCloneReader;
+struct JSStructuredCloneWriter;
+
+#define KEY_ALGORITHM_SC_VERSION 0x00000001
+
+namespace mozilla::dom {
+
+// A heap-safe variant of RsaHashedKeyAlgorithm
+// The only difference is that it uses CryptoBuffer instead of Uint8Array
+struct RsaHashedKeyAlgorithmStorage {
+  nsString mName;
+  KeyAlgorithm mHash;
+  uint16_t mModulusLength;
+  CryptoBuffer mPublicExponent;
+
+  bool ToKeyAlgorithm(JSContext* aCx, RsaHashedKeyAlgorithm& aRsa) const {
+    JS::Rooted<JSObject*> exponent(aCx, mPublicExponent.ToUint8Array(aCx));
+    if (!exponent) {
+      return false;
+    }
+
+    aRsa.mName = mName;
+    aRsa.mModulusLength = mModulusLength;
+    aRsa.mHash.mName = mHash.mName;
+    aRsa.mPublicExponent.Init(exponent);
+    aRsa.mPublicExponent.ComputeState();
+
+    return true;
+  }
+};
+
+// This class encapuslates a KeyAlgorithm object, and adds several
+// methods that make WebCrypto operations simpler.
+struct KeyAlgorithmProxy {
+  enum KeyAlgorithmType {
+    AES,
+    HMAC,
+    RSA,
+    EC,
+  };
+  KeyAlgorithmType mType;
+
+  // Plain is always populated with the algorithm name
+  // Others are only populated for the corresponding key type
+  nsString mName;
+  AesKeyAlgorithm mAes;
+  HmacKeyAlgorithm mHmac;
+  RsaHashedKeyAlgorithmStorage mRsa;
+  EcKeyAlgorithm mEc;
+
+  // Structured clone
+  bool WriteStructuredClone(JSStructuredCloneWriter* aWriter) const;
+  bool ReadStructuredClone(JSStructuredCloneReader* aReader);
+
+  // Extract various forms of derived information
+  CK_MECHANISM_TYPE Mechanism() const;
+  nsString JwkAlg() const;
+
+  // And in static form for calling on raw KeyAlgorithm dictionaries
+  static CK_MECHANISM_TYPE GetMechanism(const KeyAlgorithm& aAlgorithm);
+  static CK_MECHANISM_TYPE GetMechanism(const HmacKeyAlgorithm& aAlgorithm);
+  static nsString GetJwkAlg(const KeyAlgorithm& aAlgorithm);
+
+  // Construction of the various algorithm types
+  void MakeAes(const nsString& aName, uint32_t aLength) {
+    mType = AES;
+    mName = aName;
+    mAes.mName = aName;
+    mAes.mLength = aLength;
+  }
+
+  void MakeHmac(uint32_t aLength, const nsString& aHashName) {
+    mType = HMAC;
+    mName = NS_LITERAL_STRING_FROM_CSTRING(WEBCRYPTO_ALG_HMAC);
+    mHmac.mName = NS_LITERAL_STRING_FROM_CSTRING(WEBCRYPTO_ALG_HMAC);
+    mHmac.mLength = aLength;
+    mHmac.mHash.mName = aHashName;
+  }
+
+  bool MakeRsa(const nsString& aName, uint32_t aModulusLength,
+               const CryptoBuffer& aPublicExponent, const nsString& aHashName) {
+    mType = RSA;
+    mName = aName;
+    mRsa.mName = aName;
+    mRsa.mModulusLength = aModulusLength;
+    mRsa.mHash.mName = aHashName;
+    if (!mRsa.mPublicExponent.Assign(aPublicExponent)) {
+      return false;
+    }
+    return true;
+  }
+
+  void MakeEc(const nsString& aName, const nsString& aNamedCurve) {
+    mType = EC;
+    mName = aName;
+    mEc.mName = aName;
+    mEc.mNamedCurve = aNamedCurve;
+  }
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_KeyAlgorithmProxy_h