1/* SPDX-License-Identifier: Apache-2.0 OR BSD-2-Clause */ 2// 3// This file is dual-licensed, meaning that you can use it under your 4// choice of either of the following two licenses: 5// 6// Copyright 2023 The OpenSSL Project Authors. All Rights Reserved. 7// 8// Licensed under the Apache License 2.0 (the "License"). You can obtain 9// a copy in the file LICENSE in the source distribution or at 10// https://www.openssl.org/source/license.html 11// 12// or 13// 14// Copyright (c) 2023, Christoph Müllner <christoph.muellner@vrull.eu> 15// Copyright (c) 2023, Phoebe Chen <phoebe.chen@sifive.com> 16// Copyright (c) 2023, Jerry Shih <jerry.shih@sifive.com> 17// Copyright 2024 Google LLC 18// All rights reserved. 19// 20// Redistribution and use in source and binary forms, with or without 21// modification, are permitted provided that the following conditions 22// are met: 23// 1. Redistributions of source code must retain the above copyright 24// notice, this list of conditions and the following disclaimer. 25// 2. Redistributions in binary form must reproduce the above copyright 26// notice, this list of conditions and the following disclaimer in the 27// documentation and/or other materials provided with the distribution. 28// 29// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 30// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 31// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 32// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 33// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 34// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 35// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 36// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 37// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 38// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 39// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 40 41// This file contains macros that are shared by the other aes-*.S files. The 42// generated code of these macros depends on the following RISC-V extensions: 43// - RV64I 44// - RISC-V Vector ('V') with VLEN >= 128 45// - RISC-V Vector AES block cipher extension ('Zvkned') 46 47// Loads the AES round keys from \keyp into vector registers and jumps to code 48// specific to the length of the key. Specifically: 49// - If AES-128, loads round keys into v1-v11 and jumps to \label128. 50// - If AES-192, loads round keys into v1-v13 and jumps to \label192. 51// - If AES-256, loads round keys into v1-v15 and continues onwards. 52// 53// Also sets vl=4 and vtype=e32,m1,ta,ma. Clobbers t0 and t1. 54.macro aes_begin keyp, label128, label192, key_len 55.ifb \key_len 56 lwu t0, 480(\keyp) // t0 = key length in bytes 57.endif 58 li t1, 24 // t1 = key length for AES-192 59 vsetivli zero, 4, e32, m1, ta, ma 60 vle32.v v1, (\keyp) 61 addi \keyp, \keyp, 16 62 vle32.v v2, (\keyp) 63 addi \keyp, \keyp, 16 64 vle32.v v3, (\keyp) 65 addi \keyp, \keyp, 16 66 vle32.v v4, (\keyp) 67 addi \keyp, \keyp, 16 68 vle32.v v5, (\keyp) 69 addi \keyp, \keyp, 16 70 vle32.v v6, (\keyp) 71 addi \keyp, \keyp, 16 72 vle32.v v7, (\keyp) 73 addi \keyp, \keyp, 16 74 vle32.v v8, (\keyp) 75 addi \keyp, \keyp, 16 76 vle32.v v9, (\keyp) 77 addi \keyp, \keyp, 16 78 vle32.v v10, (\keyp) 79 addi \keyp, \keyp, 16 80 vle32.v v11, (\keyp) 81.ifb \key_len 82 blt t0, t1, \label128 // If AES-128, goto label128. 83.else 84 blt \key_len, t1, \label128 // If AES-128, goto label128. 85.endif 86 addi \keyp, \keyp, 16 87 vle32.v v12, (\keyp) 88 addi \keyp, \keyp, 16 89 vle32.v v13, (\keyp) 90.ifb \key_len 91 beq t0, t1, \label192 // If AES-192, goto label192. 92.else 93 beq \key_len, t1, \label192 // If AES-192, goto label192. 94.endif 95 // Else, it's AES-256. 96 addi \keyp, \keyp, 16 97 vle32.v v14, (\keyp) 98 addi \keyp, \keyp, 16 99 vle32.v v15, (\keyp) 100.endm 101 102// Encrypts \data using zvkned instructions, using the round keys loaded into 103// v1-v11 (for AES-128), v1-v13 (for AES-192), or v1-v15 (for AES-256). \keylen 104// is the AES key length in bits. vl and vtype must already be set 105// appropriately. Note that if vl > 4, multiple blocks are encrypted. 106.macro aes_encrypt data, keylen 107 vaesz.vs \data, v1 108 vaesem.vs \data, v2 109 vaesem.vs \data, v3 110 vaesem.vs \data, v4 111 vaesem.vs \data, v5 112 vaesem.vs \data, v6 113 vaesem.vs \data, v7 114 vaesem.vs \data, v8 115 vaesem.vs \data, v9 116 vaesem.vs \data, v10 117.if \keylen == 128 118 vaesef.vs \data, v11 119.elseif \keylen == 192 120 vaesem.vs \data, v11 121 vaesem.vs \data, v12 122 vaesef.vs \data, v13 123.else 124 vaesem.vs \data, v11 125 vaesem.vs \data, v12 126 vaesem.vs \data, v13 127 vaesem.vs \data, v14 128 vaesef.vs \data, v15 129.endif 130.endm 131 132// Same as aes_encrypt, but decrypts instead of encrypts. 133.macro aes_decrypt data, keylen 134.if \keylen == 128 135 vaesz.vs \data, v11 136.elseif \keylen == 192 137 vaesz.vs \data, v13 138 vaesdm.vs \data, v12 139 vaesdm.vs \data, v11 140.else 141 vaesz.vs \data, v15 142 vaesdm.vs \data, v14 143 vaesdm.vs \data, v13 144 vaesdm.vs \data, v12 145 vaesdm.vs \data, v11 146.endif 147 vaesdm.vs \data, v10 148 vaesdm.vs \data, v9 149 vaesdm.vs \data, v8 150 vaesdm.vs \data, v7 151 vaesdm.vs \data, v6 152 vaesdm.vs \data, v5 153 vaesdm.vs \data, v4 154 vaesdm.vs \data, v3 155 vaesdm.vs \data, v2 156 vaesdf.vs \data, v1 157.endm 158 159// Expands to aes_encrypt or aes_decrypt according to \enc, which is 1 or 0. 160.macro aes_crypt data, enc, keylen 161.if \enc 162 aes_encrypt \data, \keylen 163.else 164 aes_decrypt \data, \keylen 165.endif 166.endm 167