/* SPDX-License-Identifier: Apache-2.0 OR BSD-2-Clause */
//
// This file is dual-licensed, meaning that you can use it under your
// choice of either of the following two licenses:
//
// Copyright 2023 The OpenSSL Project Authors. All Rights Reserved.
//
// Licensed under the Apache License 2.0 (the "License"). You can obtain
// a copy in the file LICENSE in the source distribution or at
// https://www.openssl.org/source/license.html
//
// or
//
// Copyright (c) 2023, Christoph Müllner <christoph.muellner@vrull.eu>
// Copyright (c) 2023, Jerry Shih <jerry.shih@sifive.com>
// Copyright 2024 Google LLC
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
// 2. 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.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "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 THE COPYRIGHT
// OWNER OR CONTRIBUTORS 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.

// The generated code of this file depends on the following RISC-V extensions:
// - RV64I
// - RISC-V Vector ('V') with VLEN >= 128
// - RISC-V Vector SM4 Block Cipher extension ('Zvksed')
// - RISC-V Vector Cryptography Bit-manipulation extension ('Zvkb')

#include <linux/linkage.h>

.text
.option arch, +zvksed, +zvkb

// void sm4_expandkey_zksed_zvkb(const u8 user_key[16], u32 rkey_enc[32],
//                               u32 rkey_dec[32]);
SYM_FUNC_START(sm4_expandkey_zvksed_zvkb)
        vsetivli        zero, 4, e32, m1, ta, ma

        // Load the user key.
        vle32.v         v1, (a0)
        vrev8.v         v1, v1

        // XOR the user key with the family key.
        la              t0, FAMILY_KEY
        vle32.v         v2, (t0)
        vxor.vv         v1, v1, v2

        // Compute the round keys.  Store them in forwards order in rkey_enc
        // and in reverse order in rkey_dec.
        addi            a2, a2, 31*4
        li              t0, -4
        .set            i, 0
.rept 8
        vsm4k.vi        v1, v1, i
        vse32.v         v1, (a1)        // Store to rkey_enc.
        vsse32.v        v1, (a2), t0    // Store to rkey_dec.
.if i < 7
        addi            a1, a1, 16
        addi            a2, a2, -16
.endif
        .set            i, i + 1
.endr

        ret
SYM_FUNC_END(sm4_expandkey_zvksed_zvkb)

// void sm4_crypt_zvksed_zvkb(const u32 rkey[32], const u8 in[16], u8 out[16]);
SYM_FUNC_START(sm4_crypt_zvksed_zvkb)
        vsetivli        zero, 4, e32, m1, ta, ma

        // Load the input data.
        vle32.v         v1, (a1)
        vrev8.v         v1, v1

        // Do the 32 rounds of SM4, 4 at a time.
        .set            i, 0
.rept 8
        vle32.v         v2, (a0)
        vsm4r.vs        v1, v2
.if i < 7
        addi            a0, a0, 16
.endif
        .set            i, i + 1
.endr

        // Store the output data (in reverse element order).
        vrev8.v         v1, v1
        li              t0, -4
        addi            a2, a2, 12
        vsse32.v        v1, (a2), t0

        ret
SYM_FUNC_END(sm4_crypt_zvksed_zvkb)

.section ".rodata"
.p2align 2
.type FAMILY_KEY, @object
FAMILY_KEY:
        .word 0xA3B1BAC6, 0x56AA3350, 0x677D9197, 0xB27022DC
.size FAMILY_KEY, . - FAMILY_KEY