/*
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* Copyright (c) 2015, Linaro Limited
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TEE_FS_KEY_MANAGER_H
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#define TEE_FS_KEY_MANAGER_H
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#include <tee_api_types.h>
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#define TEE_FS_KM_CHIP_ID_LENGTH 32
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#define TEE_FS_KM_HMAC_ALG TEE_ALG_HMAC_SHA256
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#define TEE_FS_KM_AUTH_ENC_ALG TEE_ALG_AES_GCM
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#define TEE_FS_KM_ENC_FEK_ALG TEE_ALG_AES_ECB_NOPAD
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#define TEE_FS_KM_SSK_SIZE TEE_SHA256_HASH_SIZE
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#define TEE_FS_KM_FEK_SIZE 16 /* bytes */
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#define TEE_FS_KM_IV_LEN 12 /* bytes */
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#define TEE_FS_KM_MAX_TAG_LEN 16 /* bytes */
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enum tee_fs_file_type {
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META_FILE,
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BLOCK_FILE
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};
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struct common_header {
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uint8_t iv[TEE_FS_KM_IV_LEN];
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uint8_t tag[TEE_FS_KM_MAX_TAG_LEN];
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};
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struct meta_header {
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uint8_t encrypted_key[TEE_FS_KM_FEK_SIZE];
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struct common_header common;
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};
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struct block_header {
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struct common_header common;
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};
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#ifdef CFG_RK_SSK_COMPATIBILITY
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void rk_change_ssk(void);
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#endif
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size_t tee_fs_get_header_size(enum tee_fs_file_type type);
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TEE_Result tee_fs_generate_fek(uint8_t *encrypted_fek, int fek_size);
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TEE_Result tee_fs_encrypt_file(enum tee_fs_file_type file_type,
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const uint8_t *plaintext, size_t plaintext_size,
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uint8_t *ciphertext, size_t *ciphertext_size,
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const uint8_t *encrypted_fek);
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TEE_Result tee_fs_decrypt_file(enum tee_fs_file_type file_type,
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const uint8_t *data_in, size_t data_in_size,
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uint8_t *plaintext, size_t *plaintext_size,
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uint8_t *encrypted_fek);
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TEE_Result tee_fs_crypt_block(uint8_t *out, const uint8_t *in, size_t size,
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uint16_t blk_idx, const uint8_t *encrypted_fek,
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TEE_OperationMode mode);
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#endif
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