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diff --git a/libparc/parc/security/parc_CryptoCache.h b/libparc/parc/security/parc_CryptoCache.h
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+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @file parc_CryptoCache.h
+ * @ingroup security
+ * @brief In-memory cache of keys or certificates.
+ *
+ * Not sure how to differentiate between keys and certs at the moment.  The current API
+ * is thus built around keys.
+ *
+ */
+#include <parc/security/parc_Key.h>
+
+#ifndef libparc_parc_CryptoCache_h
+#define libparc_parc_CryptoCache_h
+
+struct parc_crypto_cache;
+typedef struct parc_crypto_cache PARCCryptoCache;
+
+PARCCryptoCache *parcCryptoCache_Create(void);
+
+/**
+ * Destroys the cache and all internal buffers.
+ *
+ * @param [in,out] cryptoCachePtr A pointer to a pointer to a `PARCCryptoCache` instance.
+ *
+ * Example:
+ * @code
+ * <#example#>
+ * @endcode
+ */
+void parcCryptoCache_Destroy(PARCCryptoCache **cryptoCachePtr);
+
+/**
+ * Adds the specified key to the keycache.
+ *
+ * Parameters must be non-null
+ * Returns true if added or false if keyid alredy existed and was a different than <code>key</code>
+ * This will store its own reference to the key, so the caller must free key.
+ *
+ * @param [in] cache A pointer to a PARCCryptoCache instance.
+ *
+ * Example:
+ * @code
+ * {
+ *      PARCKey *key = ....;
+ *      PARCCryptoCache *cache = parcCryptoCache_Create();
+ *      parcCryptoCache_AddKey(cache, key);
+ *      parcKey_release(&key);
+ *      // do stuff with the crypto cache
+ *      parcCryptoCache_Destroy(&cache);
+ * }
+ * @endcode
+ */
+bool parcCryptoCache_AddKey(PARCCryptoCache *cache, PARCKey *key);
+
+/**
+ * Fetches the Key.  The user must not modify or destroy the key.
+ *
+ * Returns NULL if the keyid is not found.
+ *
+ * @param [in] cache A pointer to a PARCCryptoCache instance.
+ * Example:
+ * @code
+ * <#example#>
+ * @endcode
+ */
+const PARCKey *parcCryptoCache_GetKey(PARCCryptoCache *cache, const PARCKeyId *keyid);
+
+/**
+ * Removes the keyid and key.  The internal buffers are destroyed.
+ *
+ * @param [in] cache A pointer to a PARCCryptoCache instance.
+ *
+ * Example:
+ * @code
+ * <#example#>
+ * @endcode
+ */
+void parcCryptoCache_RemoveKey(PARCCryptoCache *cache, const PARCKeyId *keyid);
+#endif // libparc_parc_CryptoCache_h