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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_SymmetricKeySigner.h
+ * @brief A symmetric-key signer that creates MAC tags.
+ */
+#ifndef Libparc_parc_SymmetricKeySigner
+#define Libparc_parc_SymmetricKeySigner
+#include <stdbool.h>
+
+#include <parc/algol/parc_JSON.h>
+#include <parc/algol/parc_HashCode.h>
+
+#include <parc/security/parc_SymmetricKeyStore.h>
+
+struct PARCSymmetricKeySigner;
+typedef struct PARCSymmetricKeySigner PARCSymmetricKeySigner;
+
+extern PARCSigningInterface *PARCSymmetricKeySignerAsSigner;
+
+/**
+ * Increase the number of references to a `PARCSymmetricKeySigner` instance.
+ *
+ * Note that new `PARCSymmetricKeySigner` is not created,
+ * only that the given `PARCSymmetricKeySigner` reference count is incremented.
+ * Discard the reference by invoking `parcSymmetricKeySigner_Release`.
+ *
+ * @param [in] instance A pointer to a valid PARCSymmetricKeySigner instance.
+ *
+ * @return The same value as @p instance.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCSymmetricKeySigner *a = parcSymmetricKeySigner_Create();
+ *
+ *     PARCSymmetricKeySigner *b = parcSymmetricKeySigner_Acquire();
+ *
+ *     parcSymmetricKeySigner_Release(&a);
+ *     parcSymmetricKeySigner_Release(&b);
+ * }
+ * @endcode
+ */
+PARCSymmetricKeySigner *parcSymmetricKeySigner_Acquire(const PARCSymmetricKeySigner *instance);
+
+#ifdef Libparc_DISABLE_VALIDATION
+#  define parcSymmetricKeySigner_OptionalAssertValid(_instance_)
+#else
+#  define parcSymmetricKeySigner_OptionalAssertValid(_instance_) parcSymmetricKeySigner_AssertValid(_instance_)
+#endif
+
+/**
+ * Assert that the given `PARCSymmetricKeySigner` instance is valid.
+ *
+ * @param [in] instance A pointer to a valid PARCSymmetricKeySigner instance.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCSymmetricKeySigner *a = parcSymmetricKeySigner_Create();
+ *
+ *     parcSymmetricKeySigner_AssertValid(a);
+ *
+ *     printf("Instance is valid.\n");
+ *
+ *     parcSymmetricKeySigner_Release(&b);
+ * }
+ * @endcode
+ */
+void parcSymmetricKeySigner_AssertValid(const PARCSymmetricKeySigner *instance);
+
+/**
+ * Create an instance of PARCSymmetricKeySigner
+ *
+ * <#Paragraphs Of Explanation#>
+ *
+ * @return non-NULL A pointer to a valid PARCSymmetricKeySigner instance.
+ * @return NULL An error occurred.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCSymmetricKeySigner *a = parcSymmetricKeySigner_Create();
+ *
+ *     parcSymmetricKeySigner_Release(&a);
+ * }
+ * @endcode
+ */
+PARCSymmetricKeySigner *parcSymmetricKeySigner_Create(PARCSymmetricKeyStore *keyStore, PARCCryptoHashType hmacHashType);
+
+/**
+ * Compares @p instance with @p other for order.
+ *
+ * Returns a negative integer, zero, or a positive integer as @p instance
+ * is less than, equal to, or greater than @p other.
+ *
+ * @param [in] instance A pointer to a valid PARCSymmetricKeySigner instance.
+ * @param [in] other A pointer to a valid PARCSymmetricKeySigner instance.
+ *
+ * @return <0 Instance is less than @p other.
+ * @return 0 Instance a and instance b compare the same.
+ * @return >0 Instance a is greater than instance b.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCSymmetricKeySigner *a = parcSymmetricKeySigner_Create();
+ *     PARCSymmetricKeySigner *b = parcSymmetricKeySigner_Create();
+ *
+ *     if (parcSymmetricKeySigner_Compare(a, b) == 0) {
+ *         printf("Instances are equal.\n");
+ *     }
+ *
+ *     parcSymmetricKeySigner_Release(&a);
+ *     parcSymmetricKeySigner_Release(&b);
+ * }
+ * @endcode
+ *
+ * @see parcSymmetricKeySigner_Equals
+ */
+int parcSymmetricKeySigner_Compare(const PARCSymmetricKeySigner *instance, const PARCSymmetricKeySigner *other);
+
+/**
+ * Create an independent copy the given `PARCBuffer`
+ *
+ * A new buffer is created as a complete copy of the original.
+ *
+ * @param [in] original A pointer to a valid PARCSymmetricKeySigner instance.
+ *
+ * @return NULL Memory could not be allocated.
+ * @return non-NULL A pointer to a new `PARCSymmetricKeySigner` instance.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCSymmetricKeySigner *a = parcSymmetricKeySigner_Create();
+ *
+ *     PARCSymmetricKeySigner *copy = parcSymmetricKeySigner_Copy(&b);
+ *
+ *     parcSymmetricKeySigner_Release(&b);
+ *     parcSymmetricKeySigner_Release(&copy);
+ * }
+ * @endcode
+ */
+PARCSymmetricKeySigner *parcSymmetricKeySigner_Copy(const PARCSymmetricKeySigner *original);
+
+/**
+ * Print a human readable representation of the given `PARCSymmetricKeySigner`.
+ *
+ * @param [in] instance A pointer to a valid PARCSymmetricKeySigner instance.
+ * @param [in] indentation The indentation level to use for printing.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCSymmetricKeySigner *a = parcSymmetricKeySigner_Create();
+ *
+ *     parcSymmetricKeySigner_Display(a, 0);
+ *
+ *     parcSymmetricKeySigner_Release(&a);
+ * }
+ * @endcode
+ */
+void parcSymmetricKeySigner_Display(const PARCSymmetricKeySigner *instance, int indentation);
+
+/**
+ * Determine if two `PARCSymmetricKeySigner` instances are equal.
+ *
+ * The following equivalence relations on non-null `PARCSymmetricKeySigner` instances are maintained: *
+ *   * It is reflexive: for any non-null reference value x, `parcSymmetricKeySigner_Equals(x, x)` must return true.
+ *
+ *   * It is symmetric: for any non-null reference values x and y, `parcSymmetricKeySigner_Equals(x, y)` must return true if and only if
+ *        `parcSymmetricKeySigner_Equals(y x)` returns true.
+ *
+ *   * It is transitive: for any non-null reference values x, y, and z, if
+ *        `parcSymmetricKeySigner_Equals(x, y)` returns true and
+ *        `parcSymmetricKeySigner_Equals(y, z)` returns true,
+ *        then `parcSymmetricKeySigner_Equals(x, z)` must return true.
+ *
+ *   * It is consistent: for any non-null reference values x and y, multiple invocations of `parcSymmetricKeySigner_Equals(x, y)`
+ *         consistently return true or consistently return false.
+ *
+ *   * For any non-null reference value x, `parcSymmetricKeySigner_Equals(x, NULL)` must return false.
+ *
+ * @param [in] x A pointer to a valid PARCSymmetricKeySigner instance.
+ * @param [in] y A pointer to a valid PARCSymmetricKeySigner instance.
+ *
+ * @return true The instances x and y are equal.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCSymmetricKeySigner *a = parcSymmetricKeySigner_Create();
+ *     PARCSymmetricKeySigner *b = parcSymmetricKeySigner_Create();
+ *
+ *     if (parcSymmetricKeySigner_Equals(a, b)) {
+ *         printf("Instances are equal.\n");
+ *     }
+ *
+ *     parcSymmetricKeySigner_Release(&a);
+ *     parcSymmetricKeySigner_Release(&b);
+ * }
+ * @endcode
+ * @see parcSymmetricKeySigner_HashCode
+ */
+bool parcSymmetricKeySigner_Equals(const PARCSymmetricKeySigner *x, const PARCSymmetricKeySigner *y);
+
+/**
+ * Returns a hash code value for the given instance.
+ *
+ * The general contract of `HashCode` is:
+ *
+ * Whenever it is invoked on the same instance more than once during an execution of an application,
+ * the `HashCode` function must consistently return the same value,
+ * provided no information used in a corresponding comparisons on the instance is modified.
+ *
+ * This value need not remain consistent from one execution of an application to another execution of the same application.
+ * If two instances are equal according to the {@link parcSymmetricKeySigner_Equals} method,
+ * then calling the {@link parcSymmetricKeySigner_HashCode} method on each of the two instances must produce the same integer result.
+ *
+ * It is not required that if two instances are unequal according to the
+ * {@link parcSymmetricKeySigner_Equals} function,
+ * then calling the `parcSymmetricKeySigner_HashCode`
+ * method on each of the two objects must produce distinct integer results.
+ *
+ * @param [in] instance A pointer to a valid PARCSymmetricKeySigner instance.
+ *
+ * @return The hashcode for the given instance.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCSymmetricKeySigner *a = parcSymmetricKeySigner_Create();
+ *
+ *     PARCHashCode hashValue = parcSymmetricKeySigner_HashCode(buffer);
+ *     parcSymmetricKeySigner_Release(&a);
+ * }
+ * @endcode
+ */
+PARCHashCode parcSymmetricKeySigner_HashCode(const PARCSymmetricKeySigner *instance);
+
+/**
+ * Determine if an instance of `PARCSymmetricKeySigner` is valid.
+ *
+ * Valid means the internal state of the type is consistent with its required current or future behaviour.
+ * This may include the validation of internal instances of types.
+ *
+ * @param [in] instance A pointer to a valid PARCSymmetricKeySigner instance.
+ *
+ * @return true The instance is valid.
+ * @return false The instance is not valid.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCSymmetricKeySigner *a = parcSymmetricKeySigner_Create();
+ *
+ *     if (parcSymmetricKeySigner_IsValid(a)) {
+ *         printf("Instance is valid.\n");
+ *     }
+ *
+ *     parcSymmetricKeySigner_Release(&a);
+ * }
+ * @endcode
+ *
+ */
+bool parcSymmetricKeySigner_IsValid(const PARCSymmetricKeySigner *instance);
+
+/**
+ * Release a previously acquired reference to the given `PARCSymmetricKeySigner` instance,
+ * decrementing the reference count for the instance.
+ *
+ * The pointer to the instance is set to NULL as a side-effect of this function.
+ *
+ * If the invocation causes the last reference to the instance to be released,
+ * the instance is deallocated and the instance's implementation will perform
+ * additional cleanup and release other privately held references.
+ *
+ * @param [in,out] instancePtr A pointer to a pointer to the instance to release.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCSymmetricKeySigner *a = parcSymmetricKeySigner_Create();
+ *
+ *     parcSymmetricKeySigner_Release(&a);
+ * }
+ * @endcode
+ */
+void parcSymmetricKeySigner_Release(PARCSymmetricKeySigner **instancePtr);
+
+/**
+ * Create a `PARCJSON` instance (representation) of the given object.
+ *
+ * @param [in] instance A pointer to a valid PARCSymmetricKeySigner instance.
+ *
+ * @return NULL Memory could not be allocated to contain the `PARCJSON` instance.
+ * @return non-NULL An allocated C string that must be deallocated via parcMemory_Deallocate().
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCSymmetricKeySigner *a = parcSymmetricKeySigner_Create();
+ *
+ *     PARCJSON *json = parcSymmetricKeySigner_ToJSON(a);
+ *
+ *     printf("JSON representation: %s\n", parcJSON_ToString(json));
+ *     parcJSON_Release(&json);
+ *
+ *     parcSymmetricKeySigner_Release(&a);
+ * }
+ * @endcode
+ */
+PARCJSON *parcSymmetricKeySigner_ToJSON(const PARCSymmetricKeySigner *instance);
+
+/**
+ * Produce a null-terminated string representation of the specified `PARCSymmetricKeySigner`.
+ *
+ * The result must be freed by the caller via {@link parcMemory_Deallocate}.
+ *
+ * @param [in] instance A pointer to a valid PARCSymmetricKeySigner instance.
+ *
+ * @return NULL Cannot allocate memory.
+ * @return non-NULL A pointer to an allocated, null-terminated C string that must be deallocated via {@link parcMemory_Deallocate}.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCSymmetricKeySigner *a = parcSymmetricKeySigner_Create();
+ *
+ *     char *string = parcSymmetricKeySigner_ToString(a);
+ *
+ *     parcSymmetricKeySigner_Release(&a);
+ *
+ *     parcMemory_Deallocate(&string);
+ * }
+ * @endcode
+ *
+ * @see parcSymmetricKeySigner_Display
+ */
+char *parcSymmetricKeySigner_ToString(const PARCSymmetricKeySigner *instance);
+#endif // Libparc_parc_SymmetricKeySigner