mtk-preloader/platform/common/inc/hmac.h

/* Copyright Statement:
 *
 * This software/firmware and related documentation ("MediaTek Software") are
 * protected under relevant copyright laws. The information contained herein is
 * confidential and proprietary to MediaTek Inc. and/or its licensors. Without
 * the prior written permission of MediaTek inc. and/or its licensors, any
 * reproduction, modification, use or disclosure of MediaTek Software, and
 * information contained herein, in whole or in part, shall be strictly
 * prohibited.
 *
 * MediaTek Inc. (C) 2018. All rights reserved.
 *
 * BY OPENING THIS FILE, RECEIVER HEREBY UNEQUIVOCALLY ACKNOWLEDGES AND AGREES
 * THAT THE SOFTWARE/FIRMWARE AND ITS DOCUMENTATIONS ("MEDIATEK SOFTWARE")
 * RECEIVED FROM MEDIATEK AND/OR ITS REPRESENTATIVES ARE PROVIDED TO RECEIVER
 * ON AN "AS-IS" BASIS ONLY. MEDIATEK EXPRESSLY DISCLAIMS ANY AND ALL
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 *
 * The following software/firmware and/or related documentation ("MediaTek
 * Software") have been modified by MediaTek Inc. All revisions are subject to
 * any receiver's applicable license agreements with MediaTek Inc.
 */

#ifndef _HMAC_H_
#define _HMAC_H_

#include <pal_typedefs.h>

/* hash algorithm is fixed to sha256 */
/* key size is fixed to 32 bytes according to RPMB spec */

#define RPMB_KEY_SIZE        (32) /* fixed 32 bytes in rpmb case */

#define SHA256_SIZE          (32) /* size in bytes */
#define HMAC_BLOCK_SIZE      (64) /* fixed 64 bytes in hamc sha256 case */
#define I_KEY_PAD_SIZE       (HMAC_BLOCK_SIZE) /* size in bytes */
#define O_KEY_PAD_SIZE       (HMAC_BLOCK_SIZE) /* size in bytes */
#define MSG_MAX_SIZE         (284)

struct hmac_op_metadata {
	uint8_t i_key_pad[I_KEY_PAD_SIZE];
	uint8_t msg[MSG_MAX_SIZE];
	uint8_t o_key_pad[O_KEY_PAD_SIZE];
	uint8_t hash1[SHA256_SIZE];
	uint8_t hash2[SHA256_SIZE];
};

uint32_t hmac_sha256(uint8_t *key, uint32_t key_sz,
		    uint8_t *msg, uint32_t msg_len, uint8_t *mac);

#endif  /* _HMAC_H_ */