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/* 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, Phoebe Chen <phoebe.chen@sifive.com>
// 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 AES block cipher extension ('Zvkned')
#include <linux/linkage.h>
.text
.option arch, +zvkned
#include "aes-macros.S"
#define KEYP a0
#define INP a1
#define OUTP a2
#define LEN a3
#define IVP a4
.macro __aes_crypt_zvkned enc, keylen
vle32.v v16, (INP)
aes_crypt v16, \enc, \keylen
vse32.v v16, (OUTP)
ret
.endm
.macro aes_crypt_zvkned enc
aes_begin KEYP, 128f, 192f
__aes_crypt_zvkned \enc, 256
128:
__aes_crypt_zvkned \enc, 128
192:
__aes_crypt_zvkned \enc, 192
.endm
// void aes_encrypt_zvkned(const struct crypto_aes_ctx *key,
// const u8 in[16], u8 out[16]);
SYM_FUNC_START(aes_encrypt_zvkned)
aes_crypt_zvkned 1
SYM_FUNC_END(aes_encrypt_zvkned)
// Same prototype and calling convention as the encryption function
SYM_FUNC_START(aes_decrypt_zvkned)
aes_crypt_zvkned 0
SYM_FUNC_END(aes_decrypt_zvkned)
.macro __aes_ecb_crypt enc, keylen
srli t0, LEN, 2
// t0 is the remaining length in 32-bit words. It's a multiple of 4.
1:
vsetvli t1, t0, e32, m8, ta, ma
sub t0, t0, t1 // Subtract number of words processed
slli t1, t1, 2 // Words to bytes
vle32.v v16, (INP)
aes_crypt v16, \enc, \keylen
vse32.v v16, (OUTP)
add INP, INP, t1
add OUTP, OUTP, t1
bnez t0, 1b
ret
.endm
.macro aes_ecb_crypt enc
aes_begin KEYP, 128f, 192f
__aes_ecb_crypt \enc, 256
128:
__aes_ecb_crypt \enc, 128
192:
__aes_ecb_crypt \enc, 192
.endm
// void aes_ecb_encrypt_zvkned(const struct crypto_aes_ctx *key,
// const u8 *in, u8 *out, size_t len);
//
// |len| must be nonzero and a multiple of 16 (AES_BLOCK_SIZE).
SYM_FUNC_START(aes_ecb_encrypt_zvkned)
aes_ecb_crypt 1
SYM_FUNC_END(aes_ecb_encrypt_zvkned)
// Same prototype and calling convention as the encryption function
SYM_FUNC_START(aes_ecb_decrypt_zvkned)
aes_ecb_crypt 0
SYM_FUNC_END(aes_ecb_decrypt_zvkned)
.macro aes_cbc_encrypt keylen
vle32.v v16, (IVP) // Load IV
1:
vle32.v v17, (INP) // Load plaintext block
vxor.vv v16, v16, v17 // XOR with IV or prev ciphertext block
aes_encrypt v16, \keylen // Encrypt
vse32.v v16, (OUTP) // Store ciphertext block
addi INP, INP, 16
addi OUTP, OUTP, 16
addi LEN, LEN, -16
bnez LEN, 1b
vse32.v v16, (IVP) // Store next IV
ret
.endm
.macro aes_cbc_decrypt keylen
srli LEN, LEN, 2 // Convert LEN from bytes to words
vle32.v v16, (IVP) // Load IV
1:
vsetvli t0, LEN, e32, m4, ta, ma
vle32.v v20, (INP) // Load ciphertext blocks
vslideup.vi v16, v20, 4 // Setup prev ciphertext blocks
addi t1, t0, -4
vslidedown.vx v24, v20, t1 // Save last ciphertext block
aes_decrypt v20, \keylen // Decrypt the blocks
vxor.vv v20, v20, v16 // XOR with prev ciphertext blocks
vse32.v v20, (OUTP) // Store plaintext blocks
vmv.v.v v16, v24 // Next "IV" is last ciphertext block
slli t1, t0, 2 // Words to bytes
add INP, INP, t1
add OUTP, OUTP, t1
sub LEN, LEN, t0
bnez LEN, 1b
vsetivli zero, 4, e32, m1, ta, ma
vse32.v v16, (IVP) // Store next IV
ret
.endm
// void aes_cbc_encrypt_zvkned(const struct crypto_aes_ctx *key,
// const u8 *in, u8 *out, size_t len, u8 iv[16]);
//
// |len| must be nonzero and a multiple of 16 (AES_BLOCK_SIZE).
SYM_FUNC_START(aes_cbc_encrypt_zvkned)
aes_begin KEYP, 128f, 192f
aes_cbc_encrypt 256
128:
aes_cbc_encrypt 128
192:
aes_cbc_encrypt 192
SYM_FUNC_END(aes_cbc_encrypt_zvkned)
// Same prototype and calling convention as the encryption function
SYM_FUNC_START(aes_cbc_decrypt_zvkned)
aes_begin KEYP, 128f, 192f
aes_cbc_decrypt 256
128:
aes_cbc_decrypt 128
192:
aes_cbc_decrypt 192
SYM_FUNC_END(aes_cbc_decrypt_zvkned)
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