sw/otbn/crypto/tests/p256_base_mult_test.s

/* Copyright lowRISC contributors. */
/* Licensed under the Apache License, Version 2.0, see LICENSE for details. */
/* SPDX-License-Identifier: Apache-2.0 */
/*
 *   Standalone test for P-256 scalar multiplication with base point.
 *
 *   Performs multiplication of the base point of P-256 by a scalar. This
 *   resembles computing the public key for a given private key. The scalar
 *   (private key) is contained in the .data section below.
 *
 *   See comment at the end of the file for expected values of coordinates
 *   of resulting point.
 */

.section .text.start

p256_base_mult_test:

  /* call base point multiplication routine in P-256 lib */
  jal      x1, p256_base_mult

  /* load result to WDRs for comparison with reference */
  li        x2, 0
  la        x3, x
  bn.lid    x2++, 0(x3)
  la        x3, y
  bn.lid    x2, 0(x3)

  ecall


.data

/* scalar d */
.globl d0
.balign 32
d0:
  .word 0xc7df1a56
  .word 0xfbd94efe
  .word 0xaa847f52
  .word 0x2d869bf4
  .word 0x543b963b
  .word 0xe5f2cbee
  .word 0x9144233d
  .word 0xc0fbe256
  .word 0x00000000
  .word 0x00000000
  .word 0x00000000
  .word 0x00000000
  .word 0x00000000
  .word 0x00000000
  .word 0x00000000
  .word 0x00000000
.globl d1
.balign 32
d1:
  .zero 64

/* result buffer x-coordinate */
.globl x
.balign 32
x:
  .zero 32

/* result buffer y-coordinate */
.globl y
.balign 32
y:
  .zero 32