1 files changed, 157 insertions, 0 deletions
diff --git a/libparc/parc/security/parc_CryptoCache.c b/libparc/parc/security/parc_CryptoCache.c
new file mode 100755
index 00000000..a454819b
--- /dev/null
+++ b/libparc/parc/security/parc_CryptoCache.c
@@ -0,0 +1,157 @@
+/*
+ * 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.
+ */
+
+/**
+ * @header parc_CryptoCache.c
+ * <#Abstract#>
+ *
+ *     <#Discussion#>
+ *
+ *
+ * Example:
+ * @code
+ * <#example#>
+ * @endcode
+ */
+/*
+ * This should be updated to make a reference counted copy of PARCKey and store that (along with its KeyId)
+ * instead of using a direct copy of the user data.  That way, there's no issues about destroying the entry
+ * but the user retaining a (now invalid) reference to it.
+ *
+ */
+
+#include <config.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <LongBow/runtime.h>
+
+#include <parc/algol/parc_Memory.h>
+#include <parc/security/parc_CryptoCache.h>
+#include <parc/algol/parc_HashCodeTable.h>
+
+struct parc_crypto_cache {
+    PARCHashCodeTable *keyid_table;
+};
+
+// =====================================================================
+// Translations from void* to typed pointer for use in HashCodeTable
+
+static bool
+_keyidEquals(const void *ptrA, const void *ptrB)
+{
+    return parcKeyId_Equals((const PARCKeyId *) ptrA, (const PARCKeyId *) ptrB);
+}
+
+static void
+_dataDestroy(void **voidPtr)
+{
+    PARCKey **keyPtr = (PARCKey **) voidPtr;
+    parcKey_Release(keyPtr);
+}
+
+// =====================================================================
+
+PARCCryptoCache *
+parcCryptoCache_Create()
+{
+    PARCCryptoCache *cache = parcMemory_AllocateAndClear(sizeof(PARCCryptoCache));
+    assertNotNull(cache, "parcMemory_AllocateAndClear(%zu) returned NULL", sizeof(PARCCryptoCache));
+
+    // KeyIdDestroyer is NULL because we get the keyid out of the key, and it will be destroyed
+    // when the key is destroyed.
+    cache->keyid_table = parcHashCodeTable_Create(_keyidEquals, parcKeyId_HashCodeFromVoid, NULL, _dataDestroy);
+
+    return cache;
+}
+
+/**
+ * Destroys the cache and all internal buffers.
+ *
+ * Example:
+ * @code
+ * <#example#>
+ * @endcode
+ */
+void
+parcCryptoCache_Destroy(PARCCryptoCache **cryptoCachePtr)
+{
+    assertNotNull(cryptoCachePtr, "Parameter must be non-null double pointer");
+    assertNotNull(*cryptoCachePtr, "Parameter must dereference to non-null pointer");
+
+    PARCCryptoCache *cache = *cryptoCachePtr;
+    parcHashCodeTable_Destroy(&cache->keyid_table);
+    parcMemory_Deallocate((void **) cryptoCachePtr);
+    *cryptoCachePtr = NULL;
+}
+
+/**
+ * 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>
+ *
+ * Example:
+ * @code
+ * <#example#>
+ * @endcode
+ */
+bool
+parcCryptoCache_AddKey(PARCCryptoCache *cache, PARCKey *original_key)
+{
+    assertNotNull(cache, "Parameter cache must be non-null");
+    assertNotNull(original_key, "Parameter key must be non-null");
+
+    PARCKey *key = parcKey_Copy(original_key);
+    PARCKeyId *keyid = parcKey_GetKeyId(key);
+
+    return parcHashCodeTable_Add(cache->keyid_table, keyid, key);
+}
+
+/**
+ * Fetches the Key.  The user must node modify or destroy the key.
+ *
+ * Returns NULL if the keyid is not found.
+ *
+ * Example:
+ * @code
+ * <#example#>
+ * @endcode
+ */
+const PARCKey *
+parcCryptoCache_GetKey(PARCCryptoCache *cache, const PARCKeyId *keyid)
+{
+    assertNotNull(cache, "Parameter cache must be non-null");
+    assertNotNull(keyid, "Parameter keyid must be non-null");
+
+    return parcHashCodeTable_Get(cache->keyid_table, keyid);
+}
+
+/**
+ * Removes the keyid and key.  The internal buffers are destroyed.
+ *
+ * Example:
+ * @code
+ * <#example#>
+ * @endcode
+ */
+void
+parcCryptoCache_RemoveKey(PARCCryptoCache *cache, const PARCKeyId *keyid)
+{
+    assertNotNull(cache, "Parameter cache must be non-null");
+    assertNotNull(keyid, "Parameter keyid must be non-null");
+
+    parcHashCodeTable_Del(cache->keyid_table, keyid);
+}