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/* SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause) */
/*
* Shared descriptors for CAAM black key and blob
*
* Copyright 2018-2020 NXP
*/
#ifndef _CAAMKEYBLOB_DESC_H_
#define _CAAMKEYBLOB_DESC_H_
#include <linux/types.h>
#include "jr.h"
#include "regs.h"
#include "desc.h"
#include "compat.h"
#include "tag_object.h"
#include "desc_constr.h"
/* Defines for secure memory and general memory blobs */
#define DATA_GENMEM 0
#define DATA_SECMEM 1
/* Encrypted key */
#define BLACK_KEY 1
/* Define key encryption/covering options */
#define KEY_COVER_ECB 0 /* cover key in AES-ECB */
#define KEY_COVER_CCM 1 /* cover key with AES-CCM */
/* Define the trust in the key, to select either JDKEK or TDKEK */
#define UNTRUSTED_KEY 0
#define TRUSTED_KEY 1
/* Define space required for BKEK + MAC tag storage in any blob */
#define BLOB_OVERHEAD (32 + 16)
#define PAD_16_BYTE(_key_size) (roundup(_key_size, 16))
#define PAD_8_BYTE(_key_size) (roundup(_key_size, 8))
/*
* ECB-Black Key will be padded with zeros to make it a
* multiple of 16 bytes long before it is encrypted,
* and the resulting Black Key will be this length.
*/
#define ECB_BLACK_KEY_SIZE(_key_size) (PAD_16_BYTE(_key_size))
/*
* CCM-Black Key will always be at least 12 bytes longer,
* since the encapsulation uses a 6-byte nonce and adds
* a 6-byte ICV. But first, the key is padded as necessary so
* that CCM-Black Key is a multiple of 8 bytes long.
*/
#define NONCE_SIZE 6
#define ICV_SIZE 6
#define CCM_OVERHEAD (NONCE_SIZE + ICV_SIZE)
#define CCM_BLACK_KEY_SIZE(_key_size) (PAD_8_BYTE(_key_size) \
+ CCM_OVERHEAD)
static inline int secret_size_in_ccm_black_key(int key_size)
{
return ((key_size >= CCM_OVERHEAD) ? key_size - CCM_OVERHEAD : 0);
}
#define SECRET_SIZE_IN_CCM_BLACK_KEY(_key_size) \
secret_size_in_ccm_black_key(_key_size)
/* A red key is not encrypted so its size is the same */
#define RED_KEY_SIZE(_key_size) (_key_size)
/*
* Based on memory type, the key modifier length
* can be either 8-byte or 16-byte.
*/
#define KEYMOD_SIZE_SM 8
#define KEYMOD_SIZE_GM 16
/* Create job descriptor to cover key */
int cnstr_desc_black_key(u32 **desc, char *key, size_t key_len,
dma_addr_t black_key, size_t black_key_len,
u8 key_enc, u8 trusted_key);
/* Create job descriptor to generate a random key and cover it */
int cnstr_desc_random_black_key(u32 **desc, size_t key_len,
dma_addr_t black_key, size_t black_key_len,
u8 key_enc, u8 trusted_key);
/* Encapsulate data in a blob */
int cnstr_desc_blob_encap(u32 **desc, dma_addr_t black_key,
size_t black_key_len, u8 color, u8 key_enc,
u8 trusted_key, u8 mem_type, const void *key_mod,
size_t key_mod_len, dma_addr_t blob, size_t blob_len);
/* Decapsulate data from a blob */
int cnstr_desc_blob_decap(u32 **desc, dma_addr_t blob, size_t blob_len,
const void *key_mod, size_t key_mod_len,
dma_addr_t black_key, size_t black_key_len,
u8 keycolor, u8 key_enc, u8 trusted_key, u8 mem_type);
#endif /* _CAAMKEYBLOB_DESC_H_ */
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