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#! /usr/bin/env perl
# Copyright 2022 The OpenSSL Project Authors. All Rights Reserved.
#
# Licensed under the Apache License 2.0 (the "License"). You may not use
# this file except in compliance with the License. You can obtain a copy
# in the file LICENSE in the source distribution or at
# https://www.openssl.org/source/license.html
# $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
$output = $#ARGV >= 0 && $ARGV[$#ARGV] =~ m|\.\w+$| ? pop : undef;
$flavour = $#ARGV >= 0 && $ARGV[0] !~ m|\.| ? shift : undef;
$output and open STDOUT,">$output";
################################################################################
# Utility functions to help with keeping track of which registers to stack/
# unstack when entering / exiting routines.
################################################################################
{
# Callee-saved registers
my @callee_saved = map("x$_",(2,8,9,18..27));
# Caller-saved registers
my @caller_saved = map("x$_",(1,5..7,10..17,28..31));
my @must_save;
sub use_reg {
my $reg = shift;
if (grep(/^$reg$/, @callee_saved)) {
push(@must_save, $reg);
} elsif (!grep(/^$reg$/, @caller_saved)) {
# Register is not usable!
die("Unusable register ".$reg);
}
return $reg;
}
sub use_regs {
return map(use_reg("x$_"), @_);
}
sub save_regs {
my $ret = '';
my $stack_reservation = ($#must_save + 1) * 8;
my $stack_offset = $stack_reservation;
if ($stack_reservation % 16) {
$stack_reservation += 8;
}
$ret.=" addi sp,sp,-$stack_reservation\n";
foreach (@must_save) {
$stack_offset -= 8;
$ret.=" sd $_,$stack_offset(sp)\n";
}
return $ret;
}
sub load_regs {
my $ret = '';
my $stack_reservation = ($#must_save + 1) * 8;
my $stack_offset = $stack_reservation;
if ($stack_reservation % 16) {
$stack_reservation += 8;
}
foreach (@must_save) {
$stack_offset -= 8;
$ret.=" ld $_,$stack_offset(sp)\n";
}
$ret.=" addi sp,sp,$stack_reservation\n";
return $ret;
}
sub clear_regs {
@must_save = ();
}
}
################################################################################
# util for encoding scalar crypto extension instructions
################################################################################
my @regs = map("x$_",(0..31));
my %reglookup;
@reglookup{@regs} = @regs;
# Takes a register name, possibly an alias, and converts it to a register index
# from 0 to 31
sub read_reg {
my $reg = lc shift;
if (!exists($reglookup{$reg})) {
die("Unknown register ".$reg);
}
my $regstr = $reglookup{$reg};
if (!($regstr =~ /^x([0-9]+)$/)) {
die("Could not process register ".$reg);
}
return $1;
}
sub rv64_aes64ds {
# Encoding for aes64ds rd, rs1, rs2 instruction on RV64
# XXXXXXX_ rs2 _ rs1 _XXX_ rd _XXXXXXX
my $template = 0b0011101_00000_00000_000_00000_0110011;
my $rd = read_reg shift;
my $rs1 = read_reg shift;
my $rs2 = read_reg shift;
return ".word ".($template | ($rs2 << 20) | ($rs1 << 15) | ($rd << 7));
}
sub rv64_aes64dsm {
# Encoding for aes64dsm rd, rs1, rs2 instruction on RV64
# XXXXXXX_ rs2 _ rs1 _XXX_ rd _XXXXXXX
my $template = 0b0011111_00000_00000_000_00000_0110011;
my $rd = read_reg shift;
my $rs1 = read_reg shift;
my $rs2 = read_reg shift;
return ".word ".($template | ($rs2 << 20) | ($rs1 << 15) | ($rd << 7));
}
sub rv64_aes64es {
# Encoding for aes64es rd, rs1, rs2 instruction on RV64
# XXXXXXX_ rs2 _ rs1 _XXX_ rd _XXXXXXX
my $template = 0b0011001_00000_00000_000_00000_0110011;
my $rd = read_reg shift;
my $rs1 = read_reg shift;
my $rs2 = read_reg shift;
return ".word ".($template | ($rs2 << 20) | ($rs1 << 15) | ($rd << 7));
}
sub rv64_aes64esm {
# Encoding for aes64esm rd, rs1, rs2 instruction on RV64
# XXXXXXX_ rs2 _ rs1 _XXX_ rd _XXXXXXX
my $template = 0b0011011_00000_00000_000_00000_0110011;
my $rd = read_reg shift;
my $rs1 = read_reg shift;
my $rs2 = read_reg shift;
return ".word ".($template | ($rs2 << 20) | ($rs1 << 15) | ($rd << 7));
}
sub rv64_aes64im {
# Encoding for aes64im rd, rs1 instruction on RV64
# XXXXXXXXXXXX_ rs1 _XXX_ rd _XXXXXXX
my $template = 0b001100000000_00000_001_00000_0010011;
my $rd = read_reg shift;
my $rs1 = read_reg shift;
return ".word ".($template | ($rs1 << 15) | ($rd << 7));
}
sub rv64_aes64ks1i {
# Encoding for aes64ks1i rd, rs1, rnum instruction on RV64
# XXXXXXXX_rnum_ rs1 _XXX_ rd _XXXXXXX
my $template = 0b00110001_0000_00000_001_00000_0010011;
my $rd = read_reg shift;
my $rs1 = read_reg shift;
my $rnum = shift;
return ".word ".($template | ($rnum << 20) | ($rs1 << 15) | ($rd << 7));
}
sub rv64_aes64ks2 {
# Encoding for aes64ks2 rd, rs1, rs2 instruction on RV64
# XXXXXXX_ rs2 _ rs1 _XXX_ rd _XXXXXXX
my $template = 0b0111111_00000_00000_000_00000_0110011;
my $rd = read_reg shift;
my $rs1 = read_reg shift;
my $rs2 = read_reg shift;
return ".word ".($template | ($rs2 << 20) | ($rs1 << 15) | ($rd << 7));
}
################################################################################
# Register assignment for rv64i_zkne_encrypt and rv64i_zknd_decrypt
################################################################################
# Registers to hold AES state (called s0-s3 or y0-y3 elsewhere)
my ($Q0,$Q1,$Q2,$Q3) = use_regs(6..9);
# Function arguments (x10-x12 are a0-a2 in the ABI)
# Input block pointer, output block pointer, key pointer
my ($INP,$OUTP,$KEYP) = use_regs(10..12);
# Temporaries
my ($T0,$T1) = use_regs(13..14);
# Loop counter
my ($loopcntr) = use_regs(30);
################################################################################
# void rv64i_zkne_encrypt(const unsigned char *in, unsigned char *out,
# const AES_KEY *key);
################################################################################
my $code .= <<___;
.text
.balign 16
.globl rv64i_zkne_encrypt
.type rv64i_zkne_encrypt,\@function
rv64i_zkne_encrypt:
___
$code .= save_regs();
$code .= <<___;
# Load input to block cipher
ld $Q0,0($INP)
ld $Q1,8($INP)
# Load key
ld $T0,0($KEYP)
ld $T1,8($KEYP)
# Load number of rounds
lwu $loopcntr,240($KEYP)
# initial transformation
xor $Q0,$Q0,$T0
xor $Q1,$Q1,$T1
# The main loop only executes the first N-1 rounds.
add $loopcntr,$loopcntr,-1
# Do Nr - 1 rounds (final round is special)
1:
@{[rv64_aes64esm $Q2,$Q0,$Q1]}
@{[rv64_aes64esm $Q3,$Q1,$Q0]}
# Update key ptr to point to next key in schedule
add $KEYP,$KEYP,16
# Grab next key in schedule
ld $T0,0($KEYP)
ld $T1,8($KEYP)
xor $Q0,$Q2,$T0
xor $Q1,$Q3,$T1
add $loopcntr,$loopcntr,-1
bgtz $loopcntr,1b
# final round
@{[rv64_aes64es $Q2,$Q0,$Q1]}
@{[rv64_aes64es $Q3,$Q1,$Q0]}
# since not added 16 before
ld $T0,16($KEYP)
ld $T1,24($KEYP)
xor $Q0,$Q2,$T0
xor $Q1,$Q3,$T1
sd $Q0,0($OUTP)
sd $Q1,8($OUTP)
# Pop registers and return
___
$code .= load_regs();
$code .= <<___;
ret
___
################################################################################
# void rv64i_zknd_decrypt(const unsigned char *in, unsigned char *out,
# const AES_KEY *key);
################################################################################
$code .= <<___;
.text
.balign 16
.globl rv64i_zknd_decrypt
.type rv64i_zknd_decrypt,\@function
rv64i_zknd_decrypt:
___
$code .= save_regs();
$code .= <<___;
# Load input to block cipher
ld $Q0,0($INP)
ld $Q1,8($INP)
# Load number of rounds
lwu $loopcntr,240($KEYP)
# Load the last key
slli $T0,$loopcntr,4
add $KEYP,$KEYP,$T0
ld $T0,0($KEYP)
ld $T1,8($KEYP)
xor $Q0,$Q0,$T0
xor $Q1,$Q1,$T1
# The main loop only executes the first N-1 rounds.
add $loopcntr,$loopcntr,-1
# Do Nr - 1 rounds (final round is special)
1:
@{[rv64_aes64dsm $Q2,$Q0,$Q1]}
@{[rv64_aes64dsm $Q3,$Q1,$Q0]}
# Update key ptr to point to next key in schedule
add $KEYP,$KEYP,-16
# Grab next key in schedule
ld $T0,0($KEYP)
ld $T1,8($KEYP)
xor $Q0,$Q2,$T0
xor $Q1,$Q3,$T1
add $loopcntr,$loopcntr,-1
bgtz $loopcntr,1b
# final round
@{[rv64_aes64ds $Q2,$Q0,$Q1]}
@{[rv64_aes64ds $Q3,$Q1,$Q0]}
add $KEYP,$KEYP,-16
ld $T0,0($KEYP)
ld $T1,8($KEYP)
xor $Q0,$Q2,$T0
xor $Q1,$Q3,$T1
sd $Q0,0($OUTP)
sd $Q1,8($OUTP)
# Pop registers and return
___
$code .= load_regs();
$code .= <<___;
ret
___
clear_regs();
################################################################################
# Register assignment for rv64i_zkn[e/d]_set_[en/de]crypt_key
################################################################################
# Function arguments (x10-x12 are a0-a2 in the ABI)
# Pointer to user key, number of bits in key, key pointer
my ($UKEY,$BITS,$KEYP) = use_regs(10..12);
# Temporaries
my ($T0,$T1,$T2,$T3,$T4) = use_regs(6..8,13..14);
################################################################################
# utility functions for rv64i_zkne_set_encrypt_key
################################################################################
sub ke128enc {
my $rnum = 0;
my $ret = '';
$ret .= <<___;
ld $T0,0($UKEY)
ld $T1,8($UKEY)
sd $T0,0($KEYP)
sd $T1,8($KEYP)
___
while($rnum < 10) {
$ret .= <<___;
@{[rv64_aes64ks1i $T2,$T1,$rnum]}
@{[rv64_aes64ks2 $T0,$T2,$T0]}
@{[rv64_aes64ks2 $T1,$T0,$T1]}
add $KEYP,$KEYP,16
sd $T0,0($KEYP)
sd $T1,8($KEYP)
___
$rnum++;
}
return $ret;
}
sub ke192enc {
my $rnum = 0;
my $ret = '';
$ret .= <<___;
ld $T0,0($UKEY)
ld $T1,8($UKEY)
ld $T2,16($UKEY)
sd $T0,0($KEYP)
sd $T1,8($KEYP)
sd $T2,16($KEYP)
___
while($rnum < 8) {
$ret .= <<___;
@{[rv64_aes64ks1i $T3,$T2,$rnum]}
@{[rv64_aes64ks2 $T0,$T3,$T0]}
@{[rv64_aes64ks2 $T1,$T0,$T1]}
___
if ($rnum != 7) {
# note that (8+1)*24 = 216, (12+1)*16 = 208
# thus the last 8 bytes can be dropped
$ret .= <<___;
@{[rv64_aes64ks2 $T2,$T1,$T2]}
___
}
$ret .= <<___;
add $KEYP,$KEYP,24
sd $T0,0($KEYP)
sd $T1,8($KEYP)
___
if ($rnum != 7) {
$ret .= <<___;
sd $T2,16($KEYP)
___
}
$rnum++;
}
return $ret;
}
sub ke256enc {
my $rnum = 0;
my $ret = '';
$ret .= <<___;
ld $T0,0($UKEY)
ld $T1,8($UKEY)
ld $T2,16($UKEY)
ld $T3,24($UKEY)
sd $T0,0($KEYP)
sd $T1,8($KEYP)
sd $T2,16($KEYP)
sd $T3,24($KEYP)
___
while($rnum < 7) {
$ret .= <<___;
@{[rv64_aes64ks1i $T4,$T3,$rnum]}
@{[rv64_aes64ks2 $T0,$T4,$T0]}
@{[rv64_aes64ks2 $T1,$T0,$T1]}
add $KEYP,$KEYP,32
sd $T0,0($KEYP)
sd $T1,8($KEYP)
___
if ($rnum != 6) {
# note that (7+1)*32 = 256, (14+1)*16 = 240
# thus the last 16 bytes can be dropped
$ret .= <<___;
@{[rv64_aes64ks1i $T4,$T1,0xA]}
@{[rv64_aes64ks2 $T2,$T4,$T2]}
@{[rv64_aes64ks2 $T3,$T2,$T3]}
sd $T2,16($KEYP)
sd $T3,24($KEYP)
___
}
$rnum++;
}
return $ret;
}
################################################################################
# void rv64i_zkne_set_encrypt_key(const unsigned char *userKey, const int bits,
# AES_KEY *key)
################################################################################
sub AES_set_common {
my ($ke128, $ke192, $ke256) = @_;
my $ret = '';
$ret .= <<___;
bnez $UKEY,1f # if (!userKey || !key) return -1;
bnez $KEYP,1f
li a0,-1
ret
1:
# Determine number of rounds from key size in bits
li $T0,128
bne $BITS,$T0,1f
li $T1,10 # key->rounds = 10 if bits == 128
sw $T1,240($KEYP) # store key->rounds
$ke128
j 4f
1:
li $T0,192
bne $BITS,$T0,2f
li $T1,12 # key->rounds = 12 if bits == 192
sw $T1,240($KEYP) # store key->rounds
$ke192
j 4f
2:
li $T1,14 # key->rounds = 14 if bits == 256
li $T0,256
beq $BITS,$T0,3f
li a0,-2 # If bits != 128, 192, or 256, return -2
j 5f
3:
sw $T1,240($KEYP) # store key->rounds
$ke256
4: # return 0
li a0,0
5: # return a0
___
return $ret;
}
$code .= <<___;
.text
.balign 16
.globl rv64i_zkne_set_encrypt_key
.type rv64i_zkne_set_encrypt_key,\@function
rv64i_zkne_set_encrypt_key:
___
$code .= save_regs();
$code .= AES_set_common(ke128enc(), ke192enc(),ke256enc());
$code .= load_regs();
$code .= <<___;
ret
___
################################################################################
# utility functions for rv64i_zknd_set_decrypt_key
################################################################################
sub ke128dec {
my $rnum = 0;
my $ret = '';
$ret .= <<___;
ld $T0,0($UKEY)
ld $T1,8($UKEY)
sd $T0,0($KEYP)
sd $T1,8($KEYP)
___
while($rnum < 10) {
$ret .= <<___;
@{[rv64_aes64ks1i $T2,$T1,$rnum]}
@{[rv64_aes64ks2 $T0,$T2,$T0]}
@{[rv64_aes64ks2 $T1,$T0,$T1]}
add $KEYP,$KEYP,16
___
# need to aes64im for [1:N-1] round keys
# this is from the fact that aes64dsm subwords first then mix column
# intuitively decryption needs to first mix column then subwords
# however, for merging datapaths (encryption first subwords then mix column)
# aes64dsm chooses to inverse the order of them, thus
# transform should then be done on the round key
if ($rnum < 9) {
$ret .= <<___;
@{[rv64_aes64im $T2,$T0]}
sd $T2,0($KEYP)
@{[rv64_aes64im $T2,$T1]}
sd $T2,8($KEYP)
___
} else {
$ret .= <<___;
sd $T0,0($KEYP)
sd $T1,8($KEYP)
___
}
$rnum++;
}
return $ret;
}
sub ke192dec {
my $rnum = 0;
my $ret = '';
$ret .= <<___;
ld $T0,0($UKEY)
ld $T1,8($UKEY)
ld $T2,16($UKEY)
sd $T0,0($KEYP)
sd $T1,8($KEYP)
@{[rv64_aes64im $T3,$T2]}
sd $T3,16($KEYP)
___
while($rnum < 8) {
$ret .= <<___;
@{[rv64_aes64ks1i $T3,$T2,$rnum]}
@{[rv64_aes64ks2 $T0,$T3,$T0]}
@{[rv64_aes64ks2 $T1,$T0,$T1]}
add $KEYP,$KEYP,24
___
if ($rnum < 7) {
$ret .= <<___;
@{[rv64_aes64im $T3,$T0]}
sd $T3,0($KEYP)
@{[rv64_aes64im $T3,$T1]}
sd $T3,8($KEYP)
# the reason is in ke192enc
@{[rv64_aes64ks2 $T2,$T1,$T2]}
@{[rv64_aes64im $T3,$T2]}
sd $T3,16($KEYP)
___
} else { # rnum == 7
$ret .= <<___;
sd $T0,0($KEYP)
sd $T1,8($KEYP)
___
}
$rnum++;
}
return $ret;
}
sub ke256dec {
my $rnum = 0;
my $ret = '';
$ret .= <<___;
ld $T0,0($UKEY)
ld $T1,8($UKEY)
ld $T2,16($UKEY)
ld $T3,24($UKEY)
sd $T0,0($KEYP)
sd $T1,8($KEYP)
@{[rv64_aes64im $T4,$T2]}
sd $T4,16($KEYP)
@{[rv64_aes64im $T4,$T3]}
sd $T4,24($KEYP)
___
while($rnum < 7) {
$ret .= <<___;
@{[rv64_aes64ks1i $T4,$T3,$rnum]}
@{[rv64_aes64ks2 $T0,$T4,$T0]}
@{[rv64_aes64ks2 $T1,$T0,$T1]}
add $KEYP,$KEYP,32
___
if ($rnum < 6) {
$ret .= <<___;
@{[rv64_aes64ks1i $T4,$T1,0xA]}
@{[rv64_aes64ks2 $T2,$T4,$T2]}
@{[rv64_aes64ks2 $T3,$T2,$T3]}
@{[rv64_aes64im $T4,$T0]}
sd $T4,0($KEYP)
@{[rv64_aes64im $T4,$T1]}
sd $T4,8($KEYP)
@{[rv64_aes64im $T4,$T2]}
sd $T4,16($KEYP)
@{[rv64_aes64im $T4,$T3]}
sd $T4,24($KEYP)
___
} else {
$ret .= <<___;
sd $T0,0($KEYP)
sd $T1,8($KEYP)
# last two one dropped
___
}
$rnum++;
}
return $ret;
}
################################################################################
# void rv64i_zknd_set_decrypt_key(const unsigned char *userKey, const int bits,
# AES_KEY *key)
################################################################################
$code .= <<___;
.text
.balign 16
.globl rv64i_zknd_set_decrypt_key
.type rv64i_zknd_set_decrypt_key,\@function
rv64i_zknd_set_decrypt_key:
___
$code .= save_regs();
$code .= AES_set_common(ke128dec(), ke192dec(),ke256dec());
$code .= load_regs();
$code .= <<___;
ret
___
print $code;
close STDOUT or die "error closing STDOUT: $!";
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