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/* Copyright 2015 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef __EC_CHIP_G_DCRYPTO_INTERNAL_H
#define __EC_CHIP_G_DCRYPTO_INTERNAL_H
#include <stddef.h>
#include <string.h>
#include "common.h"
#include "util.h"
#include "cryptoc/p256.h"
#include "cryptoc/sha.h"
#include "cryptoc/sha256.h"
/*
* SHA.
*/
#define CTRL_CTR_BIG_ENDIAN (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
#define CTRL_ENABLE 1
#define CTRL_ENCRYPT 1
#define CTRL_NO_SOFT_RESET 0
#define SHA_DIGEST_WORDS (SHA_DIGEST_SIZE / sizeof(uint32_t))
#define SHA256_DIGEST_WORDS (SHA256_DIGEST_SIZE / sizeof(uint32_t))
#define SHA_DIGEST_MAX_BYTES SHA256_DIGEST_SIZE
enum sha_mode {
SHA1_MODE = 0,
SHA256_MODE = 1
};
/*
* Use this structure to avoid alignment problems with input and output
* pointers.
*/
struct access_helper {
uint32_t udata;
} __packed;
#ifndef SECTION_IS_RO
int dcrypto_grab_sha_hw(void);
void dcrypto_release_sha_hw(void);
#endif
void dcrypto_sha_hash(enum sha_mode mode, const uint8_t *data,
uint32_t n, uint8_t *digest);
void dcrypto_sha_init(enum sha_mode mode);
void dcrypto_sha_update(struct HASH_CTX *unused,
const void *data, uint32_t n);
void dcrypto_sha_wait(enum sha_mode mode, uint32_t *digest);
/*
* BIGNUM.
*/
#define BN_BITS2 32
#define BN_BYTES 4
struct BIGNUM {
uint32_t dmax; /* Size of d, in 32-bit words. */
struct access_helper *d; /* Word array, little endian format ... */
};
#define BN_DIGIT(b, i) ((b)->d[(i)].udata)
void bn_init(struct BIGNUM *bn, void *buf, size_t len);
#define bn_size(b) ((b)->dmax * BN_BYTES)
#define bn_bits(b) ((b)->dmax * BN_BITS2)
int bn_check_topbit(const struct BIGNUM *N);
void bn_mont_modexp(struct BIGNUM *output, const struct BIGNUM *input,
const struct BIGNUM *exp, const struct BIGNUM *N);
uint32_t bn_add(struct BIGNUM *c, const struct BIGNUM *a);
uint32_t bn_sub(struct BIGNUM *c, const struct BIGNUM *a);
void bn_mul(struct BIGNUM *c, const struct BIGNUM *a, const struct BIGNUM *b);
int bn_modinv_vartime(struct BIGNUM *r, const struct BIGNUM *e,
const struct BIGNUM *MOD);
/*
* Utility functions.
*/
/* TODO(ngm): memset that doesn't get optimized out. */
#define dcrypto_memset(p, b, len) memset((p), (b), (len))
#endif /* ! __EC_CHIP_G_DCRYPTO_INTERNAL_H */
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