mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-12-15 19:08:07 +00:00
163 lines
4.9 KiB
C
163 lines
4.9 KiB
C
/*
|
|
* Copyright 2013 The Android Open Source Project
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* * Neither the name of Google Inc. nor the names of its contributors may
|
|
* be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY Google Inc. ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
|
|
* EVENT SHALL Google Inc. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
|
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
|
|
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
|
|
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
|
|
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
|
|
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef SYSTEM_CORE_INCLUDE_MINCRYPT_LITE_P256_H_
|
|
#define SYSTEM_CORE_INCLUDE_MINCRYPT_LITE_P256_H_
|
|
|
|
// Collection of routines manipulating 256 bit unsigned integers.
|
|
// Just enough to implement ecdsa-p256 and related algorithms.
|
|
|
|
#include <stdint.h>
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
#define P256_BITSPERDIGIT 32
|
|
#define P256_NDIGITS 8
|
|
#define P256_NBYTES 32
|
|
|
|
typedef int p256_err;
|
|
typedef uint32_t p256_digit;
|
|
typedef int32_t p256_sdigit;
|
|
typedef uint64_t p256_ddigit;
|
|
typedef int64_t p256_sddigit;
|
|
|
|
// Defining p256_int as struct to leverage struct assigment.
|
|
typedef struct {
|
|
p256_digit a[P256_NDIGITS];
|
|
} p256_int;
|
|
|
|
extern const p256_int SECP256r1_n; // Curve order
|
|
extern const p256_int SECP256r1_p; // Curve prime
|
|
extern const p256_int SECP256r1_b; // Curve param
|
|
|
|
// Initialize a p256_int to zero.
|
|
void p256_init(p256_int* a);
|
|
|
|
// Clear a p256_int to zero.
|
|
void p256_clear(p256_int* a);
|
|
|
|
// Return bit. Index 0 is least significant.
|
|
int p256_get_bit(const p256_int* a, int index);
|
|
|
|
// b := a % MOD
|
|
void p256_mod(
|
|
const p256_int* MOD,
|
|
const p256_int* a,
|
|
p256_int* b);
|
|
|
|
// c := a * (top_b | b) % MOD
|
|
void p256_modmul(
|
|
const p256_int* MOD,
|
|
const p256_int* a,
|
|
const p256_digit top_b,
|
|
const p256_int* b,
|
|
p256_int* c);
|
|
|
|
// b := 1 / a % MOD
|
|
// MOD best be SECP256r1_n
|
|
void p256_modinv(
|
|
const p256_int* MOD,
|
|
const p256_int* a,
|
|
p256_int* b);
|
|
|
|
// b := 1 / a % MOD
|
|
// MOD best be SECP256r1_n
|
|
// Faster than p256_modinv()
|
|
void p256_modinv_vartime(
|
|
const p256_int* MOD,
|
|
const p256_int* a,
|
|
p256_int* b);
|
|
|
|
// b := a << (n % P256_BITSPERDIGIT)
|
|
// Returns the bits shifted out of most significant digit.
|
|
p256_digit p256_shl(const p256_int* a, int n, p256_int* b);
|
|
|
|
// b := a >> (n % P256_BITSPERDIGIT)
|
|
void p256_shr(const p256_int* a, int n, p256_int* b);
|
|
|
|
int p256_is_zero(const p256_int* a);
|
|
int p256_is_odd(const p256_int* a);
|
|
int p256_is_even(const p256_int* a);
|
|
|
|
// Returns -1, 0 or 1.
|
|
int p256_cmp(const p256_int* a, const p256_int *b);
|
|
|
|
// c: = a - b
|
|
// Returns -1 on borrow.
|
|
int p256_sub(const p256_int* a, const p256_int* b, p256_int* c);
|
|
|
|
// c := a + b
|
|
// Returns 1 on carry.
|
|
int p256_add(const p256_int* a, const p256_int* b, p256_int* c);
|
|
|
|
// c := a + (single digit)b
|
|
// Returns carry 1 on carry.
|
|
int p256_add_d(const p256_int* a, p256_digit b, p256_int* c);
|
|
|
|
// ec routines.
|
|
|
|
// {out_x,out_y} := nG
|
|
void p256_base_point_mul(const p256_int *n,
|
|
p256_int *out_x,
|
|
p256_int *out_y);
|
|
|
|
// {out_x,out_y} := n{in_x,in_y}
|
|
void p256_point_mul(const p256_int *n,
|
|
const p256_int *in_x,
|
|
const p256_int *in_y,
|
|
p256_int *out_x,
|
|
p256_int *out_y);
|
|
|
|
// {out_x,out_y} := n1G + n2{in_x,in_y}
|
|
void p256_points_mul_vartime(
|
|
const p256_int *n1, const p256_int *n2,
|
|
const p256_int *in_x, const p256_int *in_y,
|
|
p256_int *out_x, p256_int *out_y);
|
|
|
|
// Return whether point {x,y} is on curve.
|
|
int p256_is_valid_point(const p256_int* x, const p256_int* y);
|
|
|
|
// Outputs big-endian binary form. No leading zero skips.
|
|
void p256_to_bin(const p256_int* src, uint8_t dst[P256_NBYTES]);
|
|
|
|
// Reads from big-endian binary form,
|
|
// thus pre-pad with leading zeros if short.
|
|
void p256_from_bin(const uint8_t src[P256_NBYTES], p256_int* dst);
|
|
|
|
#define P256_DIGITS(x) ((x)->a)
|
|
#define P256_DIGIT(x,y) ((x)->a[y])
|
|
|
|
#define P256_ZERO {{0}}
|
|
#define P256_ONE {{1}}
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif // SYSTEM_CORE_INCLUDE_MINCRYPT_LITE_P256_H_
|