ocrypto_sc_p224.h

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/*
 * Copyright (c) 2016 - 2024 Nordic Semiconductor ASA
 * Copyright (c) since 2013 Oberon microsystems AG
 *
 * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
 */
 
#ifndef OCRYPTO_SC_P224_H
#define OCRYPTO_SC_P224_H
 
#include <stddef.h>
#include <stdint.h>
 
 
#ifdef __cplusplus
extern "C" {
#endif
 
// P-224 scalar modulo group order
typedef struct {
    uint32_t w[7]; // little endian
} ocrypto_sc_p224;
 
 
// modulo P-224 number
typedef struct {
  uint32_t w[7]; // little endian
} ocrypto_mod_p224;
// scalar to 28 byte value
void ocrypto_sc_p224_to28bytes(uint8_t r[28], const ocrypto_sc_p224 *x);
 
// 28 byte value to scalar
// return 0 if x < group order
int ocrypto_sc_p224_from28bytes(ocrypto_sc_p224 *r, const uint8_t x[28]);
 
// reduce 36 bytes to range 0 < r < group order
void ocrypto_sc_p224_from36bytes(ocrypto_sc_p224 *r, const uint8_t x[36]);
 
 
#ifdef __cplusplus
}
#endif
 
#endif /* #ifndef OCRYPTO_SC_P224_H */