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/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2019-04-25 tyx the first version
*/
#ifndef __HW_BIGNUM_H__
#define __HW_BIGNUM_H__
#include <hwcrypto.h>
#ifdef __cplusplus
extern "C" {
#endif
struct hwcrypto_bignum;
/* bignum obj */
struct hw_bignum_mpi
{
int sign; /**< integer sign. -1 or 1 */
rt_size_t total; /**< total of limbs */
rt_uint8_t *p; /**< pointer to limbs */
};
struct hwcrypto_bignum_ops
{
rt_err_t (*add)(struct hwcrypto_bignum *bignum_ctx,
struct hw_bignum_mpi *x,
const struct hw_bignum_mpi *a,
const struct hw_bignum_mpi *b); /**< x = a + b */
rt_err_t (*sub)(struct hwcrypto_bignum *bignum_ctx,
struct hw_bignum_mpi *x,
const struct hw_bignum_mpi *a,
const struct hw_bignum_mpi *b); /**< x = a - b */
rt_err_t (*mul)(struct hwcrypto_bignum *bignum_ctx,
struct hw_bignum_mpi *x,
const struct hw_bignum_mpi *a,
const struct hw_bignum_mpi *b); /**< x = a * b */
rt_err_t (*mulmod)(struct hwcrypto_bignum *bignum_ctx,
struct hw_bignum_mpi *x,
const struct hw_bignum_mpi *a,
const struct hw_bignum_mpi *b,
const struct hw_bignum_mpi *c); /**< x = a * b (mod c) */
rt_err_t (*exptmod)(struct hwcrypto_bignum *bignum_ctx,
struct hw_bignum_mpi *x,
const struct hw_bignum_mpi *a,
const struct hw_bignum_mpi *b,
const struct hw_bignum_mpi *c); /**< x = a ^ b (mod c) */
};
/**
* @brief bignum context. Hardware driver usage
*/
struct hwcrypto_bignum
{
struct rt_hwcrypto_ctx parent; /**< Inheritance from hardware crypto context */
const struct hwcrypto_bignum_ops *ops; /**< !! Hardware initializes this value when creating context !! */
};
/**
* @brief Setting bignum default devices
*
* @return RT_EOK on success.
*/
rt_err_t rt_hwcrypto_bignum_default(struct rt_hwcrypto_device *device);
/**
* @brief Init bignum obj
*/
void rt_hwcrypto_bignum_init(struct hw_bignum_mpi *n);
/**
* @brief free a bignum obj
*
* @param Pointer to bignum obj
*/
void rt_hwcrypto_bignum_free(struct hw_bignum_mpi *n);
/**
* @brief Get length of bignum as an unsigned binary buffer
*
* @param n bignum obj
*
* @return binary buffer Length
*/
int rt_hwcrypto_bignum_get_len(const struct hw_bignum_mpi *n);
/**
* @brief Export n into unsigned binary data, big endian
*
* @param n bignum obj
* @param buf Buffer for the binary number
* @param len Length of the buffer
*
* @return export bin length
*/
int rt_hwcrypto_bignum_export_bin(struct hw_bignum_mpi *n, rt_uint8_t *buf, int len);
/**
* @brief Import n from unsigned binary data, big endian
*
* @param n bignum obj
* @param buf Buffer for the binary number
* @param len Length of the buffer
*
* @return import length.
*/
int rt_hwcrypto_bignum_import_bin(struct hw_bignum_mpi *n, rt_uint8_t *buf, int len);
/**
* @brief x = a + b
*
* @param a bignum obj
* @param b bignum obj
* @param c bignum obj
*
* @return RT_EOK on success.
*/
rt_err_t rt_hwcrypto_bignum_add(struct hw_bignum_mpi *x,
const struct hw_bignum_mpi *a,
const struct hw_bignum_mpi *b);
/**
* @brief x = a - b
*
* @param a bignum obj
* @param b bignum obj
* @param c bignum obj
*
* @return RT_EOK on success.
*/
rt_err_t rt_hwcrypto_bignum_sub(struct hw_bignum_mpi *x,
const struct hw_bignum_mpi *a,
const struct hw_bignum_mpi *b);
/**
* @brief x = a * b
*
* @param a bignum obj
* @param b bignum obj
* @param c bignum obj
*
* @return RT_EOK on success.
*/
rt_err_t rt_hwcrypto_bignum_mul(struct hw_bignum_mpi *x,
const struct hw_bignum_mpi *a,
const struct hw_bignum_mpi *b);
/**
* @brief x = a * b (mod c)
*
* @param a bignum obj
* @param b bignum obj
* @param c bignum obj
*
* @return RT_EOK on success.
*/
rt_err_t rt_hwcrypto_bignum_mulmod(struct hw_bignum_mpi *x,
const struct hw_bignum_mpi *a,
const struct hw_bignum_mpi *b,
const struct hw_bignum_mpi *c);
/**
* @brief x = a ^ b (mod c)
*
* @param a bignum obj
* @param b bignum obj
* @param c bignum obj
*
* @return RT_EOK on success.
*/
rt_err_t rt_hwcrypto_bignum_exptmod(struct hw_bignum_mpi *x,
const struct hw_bignum_mpi *a,
const struct hw_bignum_mpi *b,
const struct hw_bignum_mpi *c);
#ifdef __cplusplus
}
#endif
#endif
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