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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_CertificateFactory.h
+ * @ingroup security
+ * @brief A factory to build certificates.
+ *
+ */
+#ifndef libparc_parc_CertificateFactory_h
+#define libparc_parc_CertificateFactory_h
+
+#include <parc/security/parc_Certificate.h>
+#include <parc/security/parc_CertificateType.h>
+#include <parc/security/parc_ContainerEncoding.h>
+
+struct parc_certificate_factory;
+typedef struct parc_certificate_factory PARCCertificateFactory;
+
+/**
+ * Create a `PARCCertificateFactory` to build certificates with the specified type and encoding.
+ *
+ * @param [in] type The `PARCCertificateType` of certificates to construct.
+ * @param [in] encoding The `PARCContainerEncoding` of certificates to construct.
+ *
+ * @return NULL The memory could not be allocated.
+ * @return non-NULL A newly allocated `PARCCertificateFactory`.
+ *
+ * Example:
+ * @code
+ * {
+ * PARCCertificateFactory *factory = parcCertificateFactory_Create(PARCCertificateType_X509, PARCContainerEncoding_PEM);
+ * }
+ * @endcode
+ */
+PARCCertificateFactory *parcCertificateFactory_Create(PARCCertificateType type, PARCContainerEncoding encoding);
+
+/**
+ * Create a `PARCCertificate` from the specified filename and password.
+ *
+ * @param [in] factory The `PARCCertificateFactory` instance used to build the certificate.
+ * @param [in] filename A nul-terminated path to the certificate file.
+ * @param [in] password A nul-terminated password.
+ *
+ * @return NULL The memory could not be allocated.
+ * @return non-NULL A newly allocated `PARCCertificate`.
+ *
+ * Example:
+ * @code
+ * {
+ * char *pathToCertificate = "file.pem";
+ * PARCCertificateFactory *factory = parcCertificateFactory_Create(PARCCertificateType_X509, PARCContainerEncoding_PEM);
+ * PARCCertificate *certificate = parcCertificateFactory_CreateCertificateFromFile(factory, pathToCertificate, NULL);
+ * }
+ * @endcode
+ */
+PARCCertificate *parcCertificateFactory_CreateCertificateFromFile(PARCCertificateFactory *factory, char *filename, char *password);
+
+/**
+ * Create a `PARCCertificate` from the specified `PARCBuffer`.
+ *
+ * @param [in] factory The `PARCCertificateFactory` instance used to build the certificate.
+ * @param [in] buffer A `PARCBuffer` encoding a `PARCCertificate` instance.
+ *
+ * @return NULL The memory could not be allocated.
+ * @return non-NULL A newly allocated `PARCCertificate`.
+ *
+ * Example:
+ * @code
+ * {
+ * PARCBuffer *buffer = ...;
+ * PARCCertificateFactory *factory = parcCertificateFactory_Create(PARCCertificateType_X509, PARCContainerEncoding_DER);
+ * PARCCertificate *certificate = parcCertificateFactory_CreateCertificateFromBuffer(factory, buffer);
+ * }
+ * @endcode
+ */
+PARCCertificate *parcCertificateFactory_CreateCertificateFromBuffer(PARCCertificateFactory *factory, PARCBuffer *buffer);
+
+/**
+ * Create a self-signed `PARCCertificate` using the specified parameters and return
+ * the corresponding private key.
+ *
+ * Note: this is equivalent to the following OpenSSL command:
+ * XXXXYYYYZZZZ
+ * TODO TODO TODO
+ *
+ * @param [in] factory The `PARCCertificateFactory` instance used to build the certificate.
+ * @param [in, out] privateKey A pointer to a `PARCBuffer` pointer where the new certificate private key will be stored.
+ * @param [in] subjectName The name of the certificate subject.
+ * @param [in] keyLength The length of the public key to be derived.
+ * @param [in] validityDays The validity period.
+ *
+ * @return NULL The memory could not be allocated.
+ * @return non-NULL A newly allocated `PARCCertificate`.
+ *
+ * Example:
+ * @code
+ * {
+ * PARCBuffer *buffer = ...;
+ * PARCCertificateFactory *factory = parcCertificateFactory_Create(PARCCertificateType_X509, PARCContainerEncoding_DER);
+ * PARCCertificate *certificate = parcCertificateFactory_CreateCertificateFromBuffer(factory, buffer);
+ * }
+ * @endcode
+ */
+PARCCertificate *parcCertificateFactory_CreateSelfSignedCertificate(PARCCertificateFactory *factort, PARCBuffer **privateKey, char *subjectName, size_t keyLength, size_t valdityDays);
+
+/**
+ * Increase the number of references to a `PARCCertificateFactory` instance.
+ *
+ * Note that a new `PARCCertificateFactory` is not created,
+ * only that the given `PARCCertificateFactory` reference count is incremented.
+ * Discard the reference by invoking {@link parcCertificateFactory_Release}.
+ *
+ * @param [in] certificate A pointer to the original instance.
+ * @return The value of the input parameter @p instance.
+ *
+ * Example:
+ * @code
+ * {
+ * PARCCertificateFactory *x = parcCertificateFactory_CreateFromFile(...);
+ * PARCCertificateFactory *x2 = parcCertificateFactory_Acquire(x);
+ *
+ * parcCertificateFactory_Release(&x);
+ * parcCertificateFactory_Release(&x2);
+ * }
+ * @endcode
+ *
+ * @see {@link parcCertificateFactory_Release}
+ */
+PARCCertificateFactory *parcCertificateFactory_Acquire(const PARCCertificateFactory *factory);
+
+/**
+ * Release a previously acquired reference to the specified 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] factoryP A pointer to a pointer to the instance to release.
+ *
+ * Example:
+ * @code
+ * {
+ * PARCCertificateFactory *x = parcCertificateFactory_CreateFromFile(...);
+ *
+ * parcCertificateFactory_Release(&x);
+ * }
+ * @endcode
+ */
+void parcCertificateFactory_Release(PARCCertificateFactory **factoryP);
+#endif // libparc_parc_CertificateFactory_h