| /* Copyright lowRISC contributors. */ |
| /* Licensed under the Apache License, Version 2.0, see LICENSE for details. */ |
| /* SPDX-License-Identifier: Apache-2.0 */ |
| |
| /** |
| * Standalone elliptic curve P-256 scalar multiplication test |
| * |
| * Uses OTBN ECC P-256 lib to perform a scalar multiplication with a valid |
| * example curve point and an example scalar. Both scalar and coordinates of |
| * the curve point are contained in the .data section below. |
| * |
| * x and y cordinates of the resulting curve points are copied to wide |
| * registers. See comment at the end of the file for expected values. |
| */ |
| |
| .text |
| |
| scalar_mult_test: |
| jal x1, p256_init |
| jal x1, p256_scalarmult |
| |
| /* pointer to x-coordinate */ |
| lw x21, 20(x0) |
| /* pointer to y-coordinate */ |
| lw x22, 24(x0) |
| |
| /* copy result to wide reg file */ |
| li x8, 0 |
| bn.lid x8, 0(x21) |
| li x9, 1 |
| bn.lid x9, 0(x22) |
| |
| ecall |
| |
| |
| .data |
| |
| /* pointer to k (dptr_k) */ |
| .word 0x00000020 |
| |
| /* pointer to rnd (dptr_rnd) */ |
| .word 0x00000040 |
| |
| /* pointer to msg (dptr_msg) */ |
| .word 0x00000060 |
| |
| /* pointer to R (dptr_r) */ |
| .word 0x00000080 |
| |
| /* pointer to S (dptr_s) */ |
| .word 0x000000a0 |
| |
| /* pointer to X (dptr_x) */ |
| .word 0x000000c0 |
| |
| /* pointer to Y (dptr_y) */ |
| .word 0x000000e0 |
| |
| /* pointer to D (dptr_d) */ |
| .word 0x00000100 |
| |
| /* example scalar */ |
| .word 0xfe6d1071 |
| .word 0x21d0a016 |
| .word 0xb0b2c781 |
| .word 0x9590ef5d |
| .word 0x3fdfa379 |
| .word 0x1b76ebe8 |
| .word 0x74210263 |
| .word 0x1420fc41 |
| |
| /* example curve point x-coordinate */ |
| .skip 128 |
| .word 0xbfa8c334 |
| .word 0x9773b7b3 |
| .word 0xf36b0689 |
| .word 0x6ec0c0b2 |
| .word 0xdb6c8bf3 |
| .word 0x1628ce58 |
| .word 0xfacdc546 |
| .word 0xb5511a6a |
| |
| /* example curve point y-coordinate */ |
| .word 0x9e008c2e |
| .word 0xa8707058 |
| .word 0xab9c6924 |
| .word 0x7f7a11d0 |
| .word 0xb53a17fa |
| .word 0x43dd09ea |
| .word 0x1f31c143 |
| .word 0x42a1c697 |
| |
| /* Expected values wide register file (w0=X, w1=Y): |
| w0 = 0x5f33d746a326640a739a9490ec15c10372869f3de675b2e85742271d18c9eb82 |
| w1 = 0xb5ebbd1e4ac99c9e3d70a862e41fe23ace6ab34f7ac9f99a4c403defb76c462d |
| */ |
