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 55 lwu t0, 480(\keyp) // t0 = key length in bytes 56 li t1, 24 // t1 = key length for AES-192 57 vsetivli zero, 4, e32, m1, ta, ma 58 vle32.v v1, (\keyp) 59 addi \keyp, \keyp, 16 60 vle32.v v2, (\keyp) 61 addi \keyp, \keyp, 16 62 vle32.v v3, (\keyp) 63 addi \keyp, \keyp, 16 64 vle32.v v4, (\keyp) 65 addi \keyp, \keyp, 16 66 vle32.v v5, (\keyp) 67 addi \keyp, \keyp, 16 68 vle32.v v6, (\keyp) 69 addi \keyp, \keyp, 16 70 vle32.v v7, (\keyp) 71 addi \keyp, \keyp, 16 72 vle32.v v8, (\keyp) 73 addi \keyp, \keyp, 16 74 vle32.v v9, (\keyp) 75 addi \keyp, \keyp, 16 76 vle32.v v10, (\keyp) 77 addi \keyp, \keyp, 16 78 vle32.v v11, (\keyp) 79 blt t0, t1, \label128 // If AES-128, goto label128. 80 addi \keyp, \keyp, 16 81 vle32.v v12, (\keyp) 82 addi \keyp, \keyp, 16 83 vle32.v v13, (\keyp) 84 beq t0, t1, \label192 // If AES-192, goto label192. 85 // Else, it's AES-256. 86 addi \keyp, \keyp, 16 87 vle32.v v14, (\keyp) 88 addi \keyp, \keyp, 16 89 vle32.v v15, (\keyp) 90.endm 91 92// Encrypts \data using zvkned instructions, using the round keys loaded into 93// v1-v11 (for AES-128), v1-v13 (for AES-192), or v1-v15 (for AES-256). \keylen 94// is the AES key length in bits. vl and vtype must already be set 95// appropriately. Note that if vl > 4, multiple blocks are encrypted. 96.macro aes_encrypt data, keylen 97 vaesz.vs \data, v1 98 vaesem.vs \data, v2 99 vaesem.vs \data, v3 100 vaesem.vs \data, v4 101 vaesem.vs \data, v5 102 vaesem.vs \data, v6 103 vaesem.vs \data, v7 104 vaesem.vs \data, v8 105 vaesem.vs \data, v9 106 vaesem.vs \data, v10 107.if \keylen == 128 108 vaesef.vs \data, v11 109.elseif \keylen == 192 110 vaesem.vs \data, v11 111 vaesem.vs \data, v12 112 vaesef.vs \data, v13 113.else 114 vaesem.vs \data, v11 115 vaesem.vs \data, v12 116 vaesem.vs \data, v13 117 vaesem.vs \data, v14 118 vaesef.vs \data, v15 119.endif 120.endm 121 122// Same as aes_encrypt, but decrypts instead of encrypts. 123.macro aes_decrypt data, keylen 124.if \keylen == 128 125 vaesz.vs \data, v11 126.elseif \keylen == 192 127 vaesz.vs \data, v13 128 vaesdm.vs \data, v12 129 vaesdm.vs \data, v11 130.else 131 vaesz.vs \data, v15 132 vaesdm.vs \data, v14 133 vaesdm.vs \data, v13 134 vaesdm.vs \data, v12 135 vaesdm.vs \data, v11 136.endif 137 vaesdm.vs \data, v10 138 vaesdm.vs \data, v9 139 vaesdm.vs \data, v8 140 vaesdm.vs \data, v7 141 vaesdm.vs \data, v6 142 vaesdm.vs \data, v5 143 vaesdm.vs \data, v4 144 vaesdm.vs \data, v3 145 vaesdm.vs \data, v2 146 vaesdf.vs \data, v1 147.endm 148 149// Expands to aes_encrypt or aes_decrypt according to \enc, which is 1 or 0. 150.macro aes_crypt data, enc, keylen 151.if \enc 152 aes_encrypt \data, \keylen 153.else 154 aes_decrypt \data, \keylen 155.endif 156.endm 157