--- /dev/null
+#! /usr/bin/env perl
+# 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, Jerry Shih <jerry.shih@sifive.com>
+# 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.
+
+# - RV64I
+# - RISC-V Vector ('V') with VLEN >= 128
+# - RISC-V Vector Bit-manipulation extension ('Zvbb')
+# - RISC-V Vector GCM/GMAC extension ('Zvkg')
+# - RISC-V Vector AES block cipher extension ('Zvkned')
+# - RISC-V Zicclsm(Main memory supports misaligned loads/stores)
+
+use strict;
+use warnings;
+
+use FindBin qw($Bin);
+use lib "$Bin";
+use lib "$Bin/../../perlasm";
+use riscv;
+
+# $output is the last argument if it looks like a file (it has an extension)
+# $flavour is the first argument if it doesn't look like a file
+my $output = $#ARGV >= 0 && $ARGV[$#ARGV] =~ m|\.\w+$| ? pop : undef;
+my $flavour = $#ARGV >= 0 && $ARGV[0] !~ m|\.| ? shift : undef;
+
+$output and open STDOUT,">$output";
+
+my $code=<<___;
+.text
+___
+
+{
+################################################################################
+# void rv64i_zvbb_zvkg_zvkned_aes_xts_encrypt(const unsigned char *in,
+# unsigned char *out, size_t length,
+# const AES_KEY *key1,
+# const AES_KEY *key2,
+# const unsigned char iv[16])
+my ($INPUT, $OUTPUT, $LENGTH, $KEY1, $KEY2, $IV) = ("a0", "a1", "a2", "a3", "a4", "a5");
+my ($TAIL_LENGTH) = ("a6");
+my ($VL) = ("a7");
+my ($T0, $T1, $T2) = ("t0", "t1", "t2");
+my ($STORE_LEN32) = ("t3");
+my ($LEN32) = ("t4");
+my ($V0, $V1, $V2, $V3, $V4, $V5, $V6, $V7,
+ $V8, $V9, $V10, $V11, $V12, $V13, $V14, $V15,
+ $V16, $V17, $V18, $V19, $V20, $V21, $V22, $V23,
+ $V24, $V25, $V26, $V27, $V28, $V29, $V30, $V31,
+) = map("v$_",(0..31));
+
+sub compute_xts_iv0 {
+ my $code=<<___;
+ # Load number of rounds
+ lwu $T0, 240($KEY2)
+ @{[vsetivli "zero", 4, "e32", "m1", "ta", "ma"]}
+ @{[vle32_v $V28, $IV]}
+ @{[vle32_v $V29, $KEY2]}
+ @{[vaesz_vs $V28, $V29]}
+ addi $T0, $T0, -1
+ addi $KEY2, $KEY2, 16
+1:
+ @{[vle32_v $V29, $KEY2]}
+ @{[vaesem_vs $V28, $V29]}
+ addi $T0, $T0, -1
+ addi $KEY2, $KEY2, 16
+ bnez $T0, 1b
+ @{[vle32_v $V29, $KEY2]}
+ @{[vaesef_vs $V28, $V29]}
+___
+
+ return $code;
+}
+
+# prepare input data(v24), iv(v28), bit-reversed-iv(v16), bit-reversed-iv-multiplier(v20)
+sub init_first_round {
+ my $code=<<___;
+ # load input
+ @{[vsetvli $VL, $LEN32, "e32", "m4", "ta", "ma"]}
+ @{[vle32_v $V24, $INPUT]}
+
+ li $T0, 5
+ # We could simplify the initialization steps if we have `block<=1`.
+ blt $LEN32, $T0, 1f
+
+ # Note: We use `vgmul` for GF(2^128) multiplication. The `vgmul` uses
+ # different order of coefficients. We should use`vbrev8` to reverse the
+ # data when we use `vgmul`.
+ @{[vsetivli "zero", 4, "e32", "m1", "ta", "ma"]}
+ @{[vbrev8_v $V0, $V28]}
+ @{[vsetvli "zero", $LEN32, "e32", "m4", "ta", "ma"]}
+ @{[vmv_v_i $V16, 0]}
+ # v16: [r-IV0, r-IV0, ...]
+ @{[vaesz_vs $V16, $V0]}
+
+ # Prepare GF(2^128) multiplier [1, x, x^2, x^3, ...] in v8.
+ slli $T0, $LEN32, 2
+ @{[vsetvli "zero", $T0, "e32", "m1", "ta", "ma"]}
+ # v2: [`1`, `1`, `1`, `1`, ...]
+ @{[vmv_v_i $V2, 1]}
+ # v3: [`0`, `1`, `2`, `3`, ...]
+ @{[vid_v $V3]}
+ @{[vsetvli "zero", $T0, "e64", "m2", "ta", "ma"]}
+ # v4: [`1`, 0, `1`, 0, `1`, 0, `1`, 0, ...]
+ @{[vzext_vf2 $V4, $V2]}
+ # v6: [`0`, 0, `1`, 0, `2`, 0, `3`, 0, ...]
+ @{[vzext_vf2 $V6, $V3]}
+ slli $T0, $LEN32, 1
+ @{[vsetvli "zero", $T0, "e32", "m2", "ta", "ma"]}
+ # v8: [1<<0=1, 0, 0, 0, 1<<1=x, 0, 0, 0, 1<<2=x^2, 0, 0, 0, ...]
+ @{[vwsll_vv $V8, $V4, $V6]}
+
+ # Compute [r-IV0*1, r-IV0*x, r-IV0*x^2, r-IV0*x^3, ...] in v16
+ @{[vsetvli "zero", $LEN32, "e32", "m4", "ta", "ma"]}
+ @{[vbrev8_v $V8, $V8]}
+ @{[vgmul_vv $V16, $V8]}
+
+ # Compute [IV0*1, IV0*x, IV0*x^2, IV0*x^3, ...] in v28.
+ # Reverse the bits order back.
+ @{[vbrev8_v $V28, $V16]}
+
+ # Prepare the x^n multiplier in v20. The `n` is the aes-xts block number
+ # in a LMUL=4 register group.
+ # n = ((VLEN*LMUL)/(32*4)) = ((VLEN*4)/(32*4))
+ # = (VLEN/32)
+ # We could use vsetvli with `e32, m1` to compute the `n` number.
+ @{[vsetvli $T0, "zero", "e32", "m1", "ta", "ma"]}
+ li $T1, 1
+ sll $T0, $T1, $T0
+ @{[vsetivli "zero", 2, "e64", "m1", "ta", "ma"]}
+ @{[vmv_v_i $V0, 0]}
+ @{[vsetivli "zero", 1, "e64", "m1", "tu", "ma"]}
+ @{[vmv_v_x $V0, $T0]}
+ @{[vsetivli "zero", 2, "e64", "m1", "ta", "ma"]}
+ @{[vbrev8_v $V0, $V0]}
+ @{[vsetvli "zero", $LEN32, "e32", "m4", "ta", "ma"]}
+ @{[vmv_v_i $V20, 0]}
+ @{[vaesz_vs $V20, $V0]}
+
+ j 2f
+1:
+ @{[vsetivli "zero", 4, "e32", "m1", "ta", "ma"]}
+ @{[vbrev8_v $V16, $V28]}
+2:
+___
+
+ return $code;
+}
+
+# prepare xts enc last block's input(v24) and iv(v28)
+sub handle_xts_enc_last_block {
+ my $code=<<___;
+ bnez $TAIL_LENGTH, 1f
+ ret
+1:
+ # slidedown second to last block
+ addi $VL, $VL, -4
+ @{[vsetivli "zero", 4, "e32", "m4", "ta", "ma"]}
+ # ciphertext
+ @{[vslidedown_vx $V24, $V24, $VL]}
+ # multiplier
+ @{[vslidedown_vx $V16, $V16, $VL]}
+
+ @{[vsetivli "zero", 4, "e32", "m1", "ta", "ma"]}
+ @{[vmv_v_v $V25, $V24]}
+
+ # load last block into v24
+ # note: We should load the last block before store the second to last block
+ # for in-place operation.
+ @{[vsetvli "zero", $TAIL_LENGTH, "e8", "m1", "tu", "ma"]}
+ @{[vle8_v $V24, $INPUT]}
+
+ # setup `x` multiplier with byte-reversed order
+ # 0b00000010 => 0b01000000 (0x40)
+ li $T0, 0x40
+ @{[vsetivli "zero", 4, "e32", "m1", "ta", "ma"]}
+ @{[vmv_v_i $V28, 0]}
+ @{[vsetivli "zero", 1, "e8", "m1", "tu", "ma"]}
+ @{[vmv_v_x $V28, $T0]}
+
+ # compute IV for last block
+ @{[vsetivli "zero", 4, "e32", "m1", "ta", "ma"]}
+ @{[vgmul_vv $V16, $V28]}
+ @{[vbrev8_v $V28, $V16]}
+
+ # store second to last block
+ @{[vsetvli "zero", $TAIL_LENGTH, "e8", "m1", "ta", "ma"]}
+ @{[vse8_v $V25, $OUTPUT]}
+___
+
+ return $code;
+}
+
+# prepare xts dec second to last block's input(v24) and iv(v29) and
+# last block's and iv(v28)
+sub handle_xts_dec_last_block {
+ my $code=<<___;
+ bnez $TAIL_LENGTH, 1f
+ ret
+1:
+ # load second to last block's ciphertext
+ @{[vsetivli "zero", 4, "e32", "m1", "ta", "ma"]}
+ @{[vle32_v $V24, $INPUT]}
+ addi $INPUT, $INPUT, 16
+
+ # setup `x` multiplier with byte-reversed order
+ # 0b00000010 => 0b01000000 (0x40)
+ li $T0, 0x40
+ @{[vsetivli "zero", 4, "e32", "m1", "ta", "ma"]}
+ @{[vmv_v_i $V20, 0]}
+ @{[vsetivli "zero", 1, "e8", "m1", "tu", "ma"]}
+ @{[vmv_v_x $V20, $T0]}
+
+ beqz $LENGTH, 1f
+ # slidedown third to last block
+ addi $VL, $VL, -4
+ @{[vsetivli "zero", 4, "e32", "m4", "ta", "ma"]}
+ # multiplier
+ @{[vslidedown_vx $V16, $V16, $VL]}
+
+ # compute IV for last block
+ @{[vsetivli "zero", 4, "e32", "m1", "ta", "ma"]}
+ @{[vgmul_vv $V16, $V20]}
+ @{[vbrev8_v $V28, $V16]}
+
+ # compute IV for second to last block
+ @{[vgmul_vv $V16, $V20]}
+ @{[vbrev8_v $V29, $V16]}
+ j 2f
+1:
+ # compute IV for second to last block
+ @{[vsetivli "zero", 4, "e32", "m1", "ta", "ma"]}
+ @{[vgmul_vv $V16, $V20]}
+ @{[vbrev8_v $V29, $V16]}
+2:
+___
+
+ return $code;
+}
+
+# Load all 11 round keys to v1-v11 registers.
+sub aes_128_load_key {
+ my $code=<<___;
+ @{[vsetivli "zero", 4, "e32", "m1", "ta", "ma"]}
+ @{[vle32_v $V1, $KEY1]}
+ addi $KEY1, $KEY1, 16
+ @{[vle32_v $V2, $KEY1]}
+ addi $KEY1, $KEY1, 16
+ @{[vle32_v $V3, $KEY1]}
+ addi $KEY1, $KEY1, 16
+ @{[vle32_v $V4, $KEY1]}
+ addi $KEY1, $KEY1, 16
+ @{[vle32_v $V5, $KEY1]}
+ addi $KEY1, $KEY1, 16
+ @{[vle32_v $V6, $KEY1]}
+ addi $KEY1, $KEY1, 16
+ @{[vle32_v $V7, $KEY1]}
+ addi $KEY1, $KEY1, 16
+ @{[vle32_v $V8, $KEY1]}
+ addi $KEY1, $KEY1, 16
+ @{[vle32_v $V9, $KEY1]}
+ addi $KEY1, $KEY1, 16
+ @{[vle32_v $V10, $KEY1]}
+ addi $KEY1, $KEY1, 16
+ @{[vle32_v $V11, $KEY1]}
+___
+
+ return $code;
+}
+
+# Load all 15 round keys to v1-v15 registers.
+sub aes_256_load_key {
+ my $code=<<___;
+ @{[vsetivli "zero", 4, "e32", "m1", "ta", "ma"]}
+ @{[vle32_v $V1, $KEY1]}
+ addi $KEY1, $KEY1, 16
+ @{[vle32_v $V2, $KEY1]}
+ addi $KEY1, $KEY1, 16
+ @{[vle32_v $V3, $KEY1]}
+ addi $KEY1, $KEY1, 16
+ @{[vle32_v $V4, $KEY1]}
+ addi $KEY1, $KEY1, 16
+ @{[vle32_v $V5, $KEY1]}
+ addi $KEY1, $KEY1, 16
+ @{[vle32_v $V6, $KEY1]}
+ addi $KEY1, $KEY1, 16
+ @{[vle32_v $V7, $KEY1]}
+ addi $KEY1, $KEY1, 16
+ @{[vle32_v $V8, $KEY1]}
+ addi $KEY1, $KEY1, 16
+ @{[vle32_v $V9, $KEY1]}
+ addi $KEY1, $KEY1, 16
+ @{[vle32_v $V10, $KEY1]}
+ addi $KEY1, $KEY1, 16
+ @{[vle32_v $V11, $KEY1]}
+ addi $KEY1, $KEY1, 16
+ @{[vle32_v $V12, $KEY1]}
+ addi $KEY1, $KEY1, 16
+ @{[vle32_v $V13, $KEY1]}
+ addi $KEY1, $KEY1, 16
+ @{[vle32_v $V14, $KEY1]}
+ addi $KEY1, $KEY1, 16
+ @{[vle32_v $V15, $KEY1]}
+___
+
+ return $code;
+}
+
+# aes-128 enc with round keys v1-v11
+sub aes_128_enc {
+ my $code=<<___;
+ @{[vaesz_vs $V24, $V1]}
+ @{[vaesem_vs $V24, $V2]}
+ @{[vaesem_vs $V24, $V3]}
+ @{[vaesem_vs $V24, $V4]}
+ @{[vaesem_vs $V24, $V5]}
+ @{[vaesem_vs $V24, $V6]}
+ @{[vaesem_vs $V24, $V7]}
+ @{[vaesem_vs $V24, $V8]}
+ @{[vaesem_vs $V24, $V9]}
+ @{[vaesem_vs $V24, $V10]}
+ @{[vaesef_vs $V24, $V11]}
+___
+
+ return $code;
+}
+
+# aes-128 dec with round keys v1-v11
+sub aes_128_dec {
+ my $code=<<___;
+ @{[vaesz_vs $V24, $V11]}
+ @{[vaesdm_vs $V24, $V10]}
+ @{[vaesdm_vs $V24, $V9]}
+ @{[vaesdm_vs $V24, $V8]}
+ @{[vaesdm_vs $V24, $V7]}
+ @{[vaesdm_vs $V24, $V6]}
+ @{[vaesdm_vs $V24, $V5]}
+ @{[vaesdm_vs $V24, $V4]}
+ @{[vaesdm_vs $V24, $V3]}
+ @{[vaesdm_vs $V24, $V2]}
+ @{[vaesdf_vs $V24, $V1]}
+___
+
+ return $code;
+}
+
+# aes-256 enc with round keys v1-v15
+sub aes_256_enc {
+ my $code=<<___;
+ @{[vaesz_vs $V24, $V1]}
+ @{[vaesem_vs $V24, $V2]}
+ @{[vaesem_vs $V24, $V3]}
+ @{[vaesem_vs $V24, $V4]}
+ @{[vaesem_vs $V24, $V5]}
+ @{[vaesem_vs $V24, $V6]}
+ @{[vaesem_vs $V24, $V7]}
+ @{[vaesem_vs $V24, $V8]}
+ @{[vaesem_vs $V24, $V9]}
+ @{[vaesem_vs $V24, $V10]}
+ @{[vaesem_vs $V24, $V11]}
+ @{[vaesem_vs $V24, $V12]}
+ @{[vaesem_vs $V24, $V13]}
+ @{[vaesem_vs $V24, $V14]}
+ @{[vaesef_vs $V24, $V15]}
+___
+
+ return $code;
+}
+
+# aes-256 dec with round keys v1-v15
+sub aes_256_dec {
+ my $code=<<___;
+ @{[vaesz_vs $V24, $V15]}
+ @{[vaesdm_vs $V24, $V14]}
+ @{[vaesdm_vs $V24, $V13]}
+ @{[vaesdm_vs $V24, $V12]}
+ @{[vaesdm_vs $V24, $V11]}
+ @{[vaesdm_vs $V24, $V10]}
+ @{[vaesdm_vs $V24, $V9]}
+ @{[vaesdm_vs $V24, $V8]}
+ @{[vaesdm_vs $V24, $V7]}
+ @{[vaesdm_vs $V24, $V6]}
+ @{[vaesdm_vs $V24, $V5]}
+ @{[vaesdm_vs $V24, $V4]}
+ @{[vaesdm_vs $V24, $V3]}
+ @{[vaesdm_vs $V24, $V2]}
+ @{[vaesdf_vs $V24, $V1]}
+___
+
+ return $code;
+}
+
+$code .= <<___;
+.p2align 3
+.globl rv64i_zvbb_zvkg_zvkned_aes_xts_encrypt
+.type rv64i_zvbb_zvkg_zvkned_aes_xts_encrypt,\@function
+rv64i_zvbb_zvkg_zvkned_aes_xts_encrypt:
+ @{[compute_xts_iv0]}
+
+ # aes block size is 16
+ andi $TAIL_LENGTH, $LENGTH, 15
+ mv $STORE_LEN32, $LENGTH
+ beqz $TAIL_LENGTH, 1f
+ sub $LENGTH, $LENGTH, $TAIL_LENGTH
+ addi $STORE_LEN32, $LENGTH, -16
+1:
+ # We make the `LENGTH` become e32 length here.
+ srli $LEN32, $LENGTH, 2
+ srli $STORE_LEN32, $STORE_LEN32, 2
+
+ # Load number of rounds
+ lwu $T0, 240($KEY1)
+ li $T1, 14
+ li $T2, 10
+ beq $T0, $T1, aes_xts_enc_256
+ beq $T0, $T2, aes_xts_enc_128
+.size rv64i_zvbb_zvkg_zvkned_aes_xts_encrypt,.-rv64i_zvbb_zvkg_zvkned_aes_xts_encrypt
+___
+
+$code .= <<___;
+.p2align 3
+aes_xts_enc_128:
+ @{[init_first_round]}
+ @{[aes_128_load_key]}
+
+ @{[vsetvli $VL, $LEN32, "e32", "m4", "ta", "ma"]}
+ j 1f
+
+.Lenc_blocks_128:
+ @{[vsetvli $VL, $LEN32, "e32", "m4", "ta", "ma"]}
+ # load plaintext into v24
+ @{[vle32_v $V24, $INPUT]}
+ # update iv
+ @{[vgmul_vv $V16, $V20]}
+ # reverse the iv's bits order back
+ @{[vbrev8_v $V28, $V16]}
+1:
+ @{[vxor_vv $V24, $V24, $V28]}
+ slli $T0, $VL, 2
+ sub $LEN32, $LEN32, $VL
+ add $INPUT, $INPUT, $T0
+ @{[aes_128_enc]}
+ @{[vxor_vv $V24, $V24, $V28]}
+
+ # store ciphertext
+ @{[vsetvli "zero", $STORE_LEN32, "e32", "m4", "ta", "ma"]}
+ @{[vse32_v $V24, $OUTPUT]}
+ add $OUTPUT, $OUTPUT, $T0
+ sub $STORE_LEN32, $STORE_LEN32, $VL
+
+ bnez $LEN32, .Lenc_blocks_128
+
+ @{[handle_xts_enc_last_block]}
+
+ # xts last block
+ @{[vsetivli "zero", 4, "e32", "m1", "ta", "ma"]}
+ @{[vxor_vv $V24, $V24, $V28]}
+ @{[aes_128_enc]}
+ @{[vxor_vv $V24, $V24, $V28]}
+
+ # store last block ciphertext
+ addi $OUTPUT, $OUTPUT, -16
+ @{[vse32_v $V24, $OUTPUT]}
+
+ ret
+.size aes_xts_enc_128,.-aes_xts_enc_128
+___
+
+$code .= <<___;
+.p2align 3
+aes_xts_enc_256:
+ @{[init_first_round]}
+ @{[aes_256_load_key]}
+
+ @{[vsetvli $VL, $LEN32, "e32", "m4", "ta", "ma"]}
+ j 1f
+
+.Lenc_blocks_256:
+ @{[vsetvli $VL, $LEN32, "e32", "m4", "ta", "ma"]}
+ # load plaintext into v24
+ @{[vle32_v $V24, $INPUT]}
+ # update iv
+ @{[vgmul_vv $V16, $V20]}
+ # reverse the iv's bits order back
+ @{[vbrev8_v $V28, $V16]}
+1:
+ @{[vxor_vv $V24, $V24, $V28]}
+ slli $T0, $VL, 2
+ sub $LEN32, $LEN32, $VL
+ add $INPUT, $INPUT, $T0
+ @{[aes_256_enc]}
+ @{[vxor_vv $V24, $V24, $V28]}
+
+ # store ciphertext
+ @{[vsetvli "zero", $STORE_LEN32, "e32", "m4", "ta", "ma"]}
+ @{[vse32_v $V24, $OUTPUT]}
+ add $OUTPUT, $OUTPUT, $T0
+ sub $STORE_LEN32, $STORE_LEN32, $VL
+
+ bnez $LEN32, .Lenc_blocks_256
+
+ @{[handle_xts_enc_last_block]}
+
+ # xts last block
+ @{[vsetivli "zero", 4, "e32", "m1", "ta", "ma"]}
+ @{[vxor_vv $V24, $V24, $V28]}
+ @{[aes_256_enc]}
+ @{[vxor_vv $V24, $V24, $V28]}
+
+ # store last block ciphertext
+ addi $OUTPUT, $OUTPUT, -16
+ @{[vse32_v $V24, $OUTPUT]}
+
+ ret
+.size aes_xts_enc_256,.-aes_xts_enc_256
+___
+
+################################################################################
+# void rv64i_zvbb_zvkg_zvkned_aes_xts_decrypt(const unsigned char *in,
+# unsigned char *out, size_t length,
+# const AES_KEY *key1,
+# const AES_KEY *key2,
+# const unsigned char iv[16])
+$code .= <<___;
+.p2align 3
+.globl rv64i_zvbb_zvkg_zvkned_aes_xts_decrypt
+.type rv64i_zvbb_zvkg_zvkned_aes_xts_decrypt,\@function
+rv64i_zvbb_zvkg_zvkned_aes_xts_decrypt:
+ @{[compute_xts_iv0]}
+
+ # aes block size is 16
+ andi $TAIL_LENGTH, $LENGTH, 15
+ beqz $TAIL_LENGTH, 1f
+ sub $LENGTH, $LENGTH, $TAIL_LENGTH
+ addi $LENGTH, $LENGTH, -16
+1:
+ # We make the `LENGTH` become e32 length here.
+ srli $LEN32, $LENGTH, 2
+
+ # Load number of rounds
+ lwu $T0, 240($KEY1)
+ li $T1, 14
+ li $T2, 10
+ beq $T0, $T1, aes_xts_dec_256
+ beq $T0, $T2, aes_xts_dec_128
+.size rv64i_zvbb_zvkg_zvkned_aes_xts_decrypt,.-rv64i_zvbb_zvkg_zvkned_aes_xts_decrypt
+___
+
+$code .= <<___;
+.p2align 3
+aes_xts_dec_128:
+ @{[init_first_round]}
+ @{[aes_128_load_key]}
+
+ beqz $LEN32, 2f
+
+ @{[vsetvli $VL, $LEN32, "e32", "m4", "ta", "ma"]}
+ j 1f
+
+.Ldec_blocks_128:
+ @{[vsetvli $VL, $LEN32, "e32", "m4", "ta", "ma"]}
+ # load ciphertext into v24
+ @{[vle32_v $V24, $INPUT]}
+ # update iv
+ @{[vgmul_vv $V16, $V20]}
+ # reverse the iv's bits order back
+ @{[vbrev8_v $V28, $V16]}
+1:
+ @{[vxor_vv $V24, $V24, $V28]}
+ slli $T0, $VL, 2
+ sub $LEN32, $LEN32, $VL
+ add $INPUT, $INPUT, $T0
+ @{[aes_128_dec]}
+ @{[vxor_vv $V24, $V24, $V28]}
+
+ # store plaintext
+ @{[vse32_v $V24, $OUTPUT]}
+ add $OUTPUT, $OUTPUT, $T0
+
+ bnez $LEN32, .Ldec_blocks_128
+
+2:
+ @{[handle_xts_dec_last_block]}
+
+ ## xts second to last block
+ @{[vsetivli "zero", 4, "e32", "m1", "ta", "ma"]}
+ @{[vxor_vv $V24, $V24, $V29]}
+ @{[aes_128_dec]}
+ @{[vxor_vv $V24, $V24, $V29]}
+ @{[vmv_v_v $V25, $V24]}
+
+ # load last block ciphertext
+ @{[vsetvli "zero", $TAIL_LENGTH, "e8", "m1", "tu", "ma"]}
+ @{[vle8_v $V24, $INPUT]}
+
+ # store second to last block plaintext
+ addi $T0, $OUTPUT, 16
+ @{[vse8_v $V25, $T0]}
+
+ ## xts last block
+ @{[vsetivli "zero", 4, "e32", "m1", "ta", "ma"]}
+ @{[vxor_vv $V24, $V24, $V28]}
+ @{[aes_128_dec]}
+ @{[vxor_vv $V24, $V24, $V28]}
+
+ # store second to last block plaintext
+ @{[vse32_v $V24, $OUTPUT]}
+
+ ret
+.size aes_xts_dec_128,.-aes_xts_dec_128
+___
+
+$code .= <<___;
+.p2align 3
+aes_xts_dec_256:
+ @{[init_first_round]}
+ @{[aes_256_load_key]}
+
+ beqz $LEN32, 2f
+
+ @{[vsetvli $VL, $LEN32, "e32", "m4", "ta", "ma"]}
+ j 1f
+
+.Ldec_blocks_256:
+ @{[vsetvli $VL, $LEN32, "e32", "m4", "ta", "ma"]}
+ # load ciphertext into v24
+ @{[vle32_v $V24, $INPUT]}
+ # update iv
+ @{[vgmul_vv $V16, $V20]}
+ # reverse the iv's bits order back
+ @{[vbrev8_v $V28, $V16]}
+1:
+ @{[vxor_vv $V24, $V24, $V28]}
+ slli $T0, $VL, 2
+ sub $LEN32, $LEN32, $VL
+ add $INPUT, $INPUT, $T0
+ @{[aes_256_dec]}
+ @{[vxor_vv $V24, $V24, $V28]}
+
+ # store plaintext
+ @{[vse32_v $V24, $OUTPUT]}
+ add $OUTPUT, $OUTPUT, $T0
+
+ bnez $LEN32, .Ldec_blocks_256
+
+2:
+ @{[handle_xts_dec_last_block]}
+
+ ## xts second to last block
+ @{[vsetivli "zero", 4, "e32", "m1", "ta", "ma"]}
+ @{[vxor_vv $V24, $V24, $V29]}
+ @{[aes_256_dec]}
+ @{[vxor_vv $V24, $V24, $V29]}
+ @{[vmv_v_v $V25, $V24]}
+
+ # load last block ciphertext
+ @{[vsetvli "zero", $TAIL_LENGTH, "e8", "m1", "tu", "ma"]}
+ @{[vle8_v $V24, $INPUT]}
+
+ # store second to last block plaintext
+ addi $T0, $OUTPUT, 16
+ @{[vse8_v $V25, $T0]}
+
+ ## xts last block
+ @{[vsetivli "zero", 4, "e32", "m1", "ta", "ma"]}
+ @{[vxor_vv $V24, $V24, $V28]}
+ @{[aes_256_dec]}
+ @{[vxor_vv $V24, $V24, $V28]}
+
+ # store second to last block plaintext
+ @{[vse32_v $V24, $OUTPUT]}
+
+ ret
+.size aes_xts_dec_256,.-aes_xts_dec_256
+___
+}
+
+print $code;
+
+close STDOUT or die "error closing STDOUT: $!";
projects / openssl.git / commitdiff