--- /dev/null
+/* Copyright (c) 2014, Google Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
+
+#ifndef OPENSSL_HEADER_ENGINE_H
+#define OPENSSL_HEADER_ENGINE_H
+
+#include <openssl/base.h>
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+
+// Engines are collections of methods. Methods are tables of function pointers,
+// defined for certain algorithms, that allow operations on those algorithms to
+// be overridden via a callback. This can be used, for example, to implement an
+// RSA* that forwards operations to a hardware module.
+//
+// Methods are reference counted but |ENGINE|s are not. When creating a method,
+// you should zero the whole structure and fill in the function pointers that
+// you wish before setting it on an |ENGINE|. Any functions pointers that
+// are NULL indicate that the default behaviour should be used.
+
+
+// Allocation and destruction.
+
+// ENGINE_new returns an empty ENGINE that uses the default method for all
+// algorithms.
+OPENSSL_EXPORT ENGINE *ENGINE_new(void);
+
+// ENGINE_free decrements the reference counts for all methods linked from
+// |engine| and frees |engine| itself.
+OPENSSL_EXPORT void ENGINE_free(ENGINE *engine);
+
+
+// Method accessors.
+//
+// Method accessors take a method pointer and the size of the structure. The
+// size allows for ABI compatibility in the case that the method structure is
+// extended with extra elements at the end. Methods are always copied by the
+// set functions.
+//
+// Set functions return one on success and zero on allocation failure.
+
+OPENSSL_EXPORT int ENGINE_set_RSA_method(ENGINE *engine,
+ const RSA_METHOD *method,
+ size_t method_size);
+OPENSSL_EXPORT RSA_METHOD *ENGINE_get_RSA_method(const ENGINE *engine);
+
+OPENSSL_EXPORT int ENGINE_set_ECDSA_method(ENGINE *engine,
+ const ECDSA_METHOD *method,
+ size_t method_size);
+OPENSSL_EXPORT ECDSA_METHOD *ENGINE_get_ECDSA_method(const ENGINE *engine);
+
+
+// Generic method functions.
+//
+// These functions take a void* type but actually operate on all method
+// structures.
+
+// METHOD_ref increments the reference count of |method|. This is a no-op for
+// now because all methods are currently static.
+void METHOD_ref(void *method);
+
+// METHOD_unref decrements the reference count of |method| and frees it if the
+// reference count drops to zero. This is a no-op for now because all methods
+// are currently static.
+void METHOD_unref(void *method);
+
+
+// Private functions.
+
+// openssl_method_common_st contains the common part of all method structures.
+// This must be the first member of all method structures.
+struct openssl_method_common_st {
+ int references; // dummy – not used.
+ char is_static;
+};
+
+
+#if defined(__cplusplus)
+} // extern C
+
+extern "C++" {
+
+namespace bssl {
+
+BORINGSSL_MAKE_DELETER(ENGINE, ENGINE_free)
+
+} // namespace bssl
+
+} // extern C++
+
+#endif
+
+#define ENGINE_R_OPERATION_NOT_SUPPORTED 100
+
+#endif // OPENSSL_HEADER_ENGINE_H
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