| /* 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 curve point test |
| * |
| * Uses OTBN ECC P-256 lib to check if a curve point is on the P-256 curve. The |
| * point is on the curve if the R and S return values are identical. The test |
| * uses an example point which is on the curve. The point's coordinates are |
| * contained in the .data section below. |
| * |
| * R and S are copied to the wide registers. See comment at the end of the file |
| * for expected values for the example point. |
| */ |
| |
| .text |
| |
| curve_point_test: |
| jal x1, p256init |
| jal x1, p256isoncurve |
| |
| /* pointer to R */ |
| lw x21, 12(x0) |
| /* pointer to S */ |
| lw x22, 16(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 curve point x-coordinate */ |
| .skip 160 |
| .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=R, w1=S): |
| w0 = 0xb103b614b389c6b8e1a08330a6ce0b9c4b3726ec0bf61f6bdd66af03a4af5660 |
| w1 = 0xb103b614b389c6b8e1a08330a6ce0b9c4b3726ec0bf61f6bdd66af03a4af5660 |
| */ |
