diff --git a/include/common/auth.h b/include/common/auth.h
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+/*
+ * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * Neither the name of ARM nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without specific
+ * prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef AUTH_H_
+#define AUTH_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+/*
+ * Authentication infrastructure for Trusted Boot
+ *
+ * This infrastructure provides an API to access the authentication module. This
+ * module will implement the required operations for Trusted Boot by creating an
+ * instance of the structure 'auth_mod_t'. This instance must be called
+ * 'auth_mod' and must provide the functions to initialize the module and
+ * verify the authenticity of the images.
+ */
+
+/* Objects (images and certificates) involved in the TBB process */
+enum {
+	AUTH_BL2_IMG_CERT,
+	AUTH_BL2_IMG,
+	AUTH_TRUSTED_KEY_CERT,
+	AUTH_BL30_KEY_CERT,
+	AUTH_BL30_IMG_CERT,
+	AUTH_BL30_IMG,
+	AUTH_BL31_KEY_CERT,
+	AUTH_BL31_IMG_CERT,
+	AUTH_BL31_IMG,
+	AUTH_BL32_KEY_CERT,
+	AUTH_BL32_IMG_CERT,
+	AUTH_BL32_IMG,
+	AUTH_BL33_KEY_CERT,
+	AUTH_BL33_IMG_CERT,
+	AUTH_BL33_IMG,
+	AUTH_NUM_OBJ
+};
+
+/* Authentication module structure */
+typedef struct auth_mod_s {
+	/* [mandatory] Module name. Printed to the log during initialization */
+	const char *name;
+
+	/* [mandatory] Initialize the authentication module */
+	int (*init)(void);
+
+	/* [mandatory] This function will be called to authenticate a new
+	 * object loaded into memory. The obj_id corresponds to one of the
+	 * values in the enumeration above */
+	int (*verify)(unsigned int obj_id, uintptr_t obj_buf, size_t len);
+} auth_mod_t;
+
+/* This variable must be instantiated by the authentication module */
+extern const auth_mod_t auth_mod;
+
+/* Public functions */
+void auth_init(void);
+int auth_verify_obj(unsigned int obj_id, uintptr_t obj_buf, size_t len);
+
+#endif /* AUTH_H_ */