diff --git a/include/drivers/auth/auth_common.h b/include/drivers/auth/auth_common.h
new file mode 100644
index 0000000..52a895e
--- /dev/null
+++ b/include/drivers/auth/auth_common.h
@@ -0,0 +1,141 @@
+/*
+ * 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_COMMON_H__
+#define __AUTH_COMMON_H__
+
+/*
+ * Authentication framework common types
+ */
+
+/*
+ * Type of parameters that can be extracted from an image and
+ * used for authentication
+ */
+typedef enum auth_param_type_enum {
+	AUTH_PARAM_NONE,
+	AUTH_PARAM_RAW_DATA,		/* Raw image data */
+	AUTH_PARAM_SIG,			/* The image signature */
+	AUTH_PARAM_SIG_ALG,		/* The image signature algorithm */
+	AUTH_PARAM_HASH,		/* A hash (including the algorithm) */
+	AUTH_PARAM_PUB_KEY,		/* A public key */
+} auth_param_type_t;
+
+/*
+ * Defines an authentication parameter. The cookie will be interpreted by the
+ * image parser module.
+ */
+typedef struct auth_param_type_desc_s {
+	auth_param_type_t type;
+	void *cookie;
+} auth_param_type_desc_t;
+
+/*
+ * Store a pointer to the authentication parameter and its length
+ */
+typedef struct auth_param_data_desc_s {
+	void *ptr;
+	unsigned int len;
+} auth_param_data_desc_t;
+
+/*
+ * Authentication parameter descriptor, including type and value
+ */
+typedef struct auth_param_desc_s {
+	auth_param_type_desc_t *type_desc;
+	auth_param_data_desc_t data;
+} auth_param_desc_t;
+
+/*
+ * The method type defines how an image is authenticated
+ */
+typedef enum auth_method_type_enum {
+	AUTH_METHOD_NONE = 0,
+	AUTH_METHOD_HASH,	/* Authenticate by hash matching */
+	AUTH_METHOD_SIG,	/* Authenticate by PK operation */
+	AUTH_METHOD_NUM 	/* Number of methods */
+} auth_method_type_t;
+
+/*
+ * Parameters for authentication by hash matching
+ */
+typedef struct auth_method_param_hash_s {
+	auth_param_type_desc_t *data;	/* Data to hash */
+	auth_param_type_desc_t *hash;	/* Hash to match with */
+} auth_method_param_hash_t;
+
+/*
+ * Parameters for authentication by signature
+ */
+typedef struct auth_method_param_sig_s {
+	auth_param_type_desc_t *pk;	/* Public key */
+	auth_param_type_desc_t *sig;	/* Signature to check */
+	auth_param_type_desc_t *alg;	/* Signature algorithm */
+	auth_param_type_desc_t *data;	/* Data signed */
+} auth_method_param_sig_t;
+
+/*
+ * Parameters for authentication by NV counter
+ */
+typedef struct auth_method_param_nv_ctr_s {
+	auth_param_type_desc_t *nv_ctr;	/* NV counter value */
+} auth_method_param_nv_ctr_t;
+
+/*
+ * Authentication method descriptor
+ */
+typedef struct auth_method_desc_s {
+	auth_method_type_t type;
+	union {
+		auth_method_param_hash_t hash;
+		auth_method_param_sig_t sig;
+		auth_method_param_nv_ctr_t nv_ctr;
+	} param;
+} auth_method_desc_t;
+
+/*
+ * Helper macro to define an authentication parameter type descriptor
+ */
+#define AUTH_PARAM_TYPE_DESC(_type, _cookie) \
+	{ \
+		.type = _type, \
+		.cookie = (void *)_cookie \
+	}
+
+/*
+ * Helper macro to define an authentication parameter data descriptor
+ */
+#define AUTH_PARAM_DATA_DESC(_ptr, _len) \
+	{ \
+		.ptr = (void *)_ptr, \
+		.len = (unsigned int)_len \
+	}
+
+#endif /* __AUTH_COMMON_H__ */