[PATCH RFC v2 14/16] RISC-V: crypto: add Zvkned accelerated AES encryption implementation
Heiko Stuebner
heiko at sntech.de
Mon Feb 27 16:05:42 PST 2023
From: Heiko Stuebner <heiko.stuebner at vrull.eu>
This adds an AES implementation using the Zvkned vector crypto instructions.
Signed-off-by: Heiko Stuebner <heiko.stuebner at vrull.eu>
---
arch/riscv/crypto/Kconfig | 14 +
arch/riscv/crypto/Makefile | 7 +
arch/riscv/crypto/aes-riscv-glue.c | 169 ++++++++
arch/riscv/crypto/aes-riscv64-zvkned.pl | 500 ++++++++++++++++++++++++
4 files changed, 690 insertions(+)
create mode 100644 arch/riscv/crypto/aes-riscv-glue.c
create mode 100644 arch/riscv/crypto/aes-riscv64-zvkned.pl
diff --git a/arch/riscv/crypto/Kconfig b/arch/riscv/crypto/Kconfig
index da6244f0c0c4..c8abb29bb49b 100644
--- a/arch/riscv/crypto/Kconfig
+++ b/arch/riscv/crypto/Kconfig
@@ -2,6 +2,20 @@
menu "Accelerated Cryptographic Algorithms for CPU (riscv)"
+config CRYPTO_AES_RISCV
+ tristate "Ciphers: AES (RISCV)"
+ depends on 64BIT && RISCV_ISA_V
+ select CRYPTO_AES
+ help
+ Block ciphers: AES cipher algorithms (FIPS-197)
+ Length-preserving ciphers: AES with ECB, CBC, CTR, CTS,
+ XCTR, and XTS modes
+ AEAD cipher: AES with CBC, ESSIV, and SHA-256
+ for fscrypt and dm-crypt
+
+ Architecture: riscv using one of
+ - Zvkns
+
config CRYPTO_GHASH_RISCV64
tristate "Hash functions: GHASH"
depends on 64BIT && (RISCV_ISA_ZBC || RISCV_ISA_V)
diff --git a/arch/riscv/crypto/Makefile b/arch/riscv/crypto/Makefile
index 3c94753affdf..e5c702dff883 100644
--- a/arch/riscv/crypto/Makefile
+++ b/arch/riscv/crypto/Makefile
@@ -3,6 +3,9 @@
# linux/arch/riscv/crypto/Makefile
#
+obj-$(CONFIG_CRYPTO_AES_RISCV) += aes-riscv.o
+aes-riscv-y := aes-riscv-glue.o aes-riscv64-zvkned.o
+
obj-$(CONFIG_CRYPTO_GHASH_RISCV64) += ghash-riscv64.o
ghash-riscv64-y := ghash-riscv64-glue.o
ifdef CONFIG_RISCV_ISA_ZBC
@@ -21,6 +24,9 @@ sha512-riscv64-y := sha512-riscv64-glue.o sha512-riscv64-zvknhb.o
quiet_cmd_perlasm = PERLASM $@
cmd_perlasm = $(PERL) $(<) void $(@)
+$(obj)/aes-riscv64-zvkned.S: $(src)/aes-riscv64-zvkned.pl
+ $(call cmd,perlasm)
+
$(obj)/ghash-riscv64-zbc.S: $(src)/ghash-riscv64-zbc.pl
$(call cmd,perlasm)
@@ -36,5 +42,6 @@ $(obj)/sha256-riscv64-zvknhb.S: $(src)/sha256-riscv64-zvknha.pl
$(obj)/sha512-riscv64-zvknhb.S: $(src)/sha512-riscv64-zvknhb.pl
$(call cmd,perlasm)
+clean-files += aes-riscv64-zvkned.S
clean-files += ghash-riscv64-zbc.S ghash-riscv64-zvkb.S ghash-riscv64-zvkg.S
clean-files += sha256-riscv64-zvknha.S sha512-riscv64-zvknhb.S
diff --git a/arch/riscv/crypto/aes-riscv-glue.c b/arch/riscv/crypto/aes-riscv-glue.c
new file mode 100644
index 000000000000..f0b73058bb54
--- /dev/null
+++ b/arch/riscv/crypto/aes-riscv-glue.c
@@ -0,0 +1,169 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Linux/riscv port of the OpenSSL AES implementation for RISCV
+ *
+ * Copyright (C) 2023 VRULL GmbH
+ * Author: Heiko Stuebner <heiko.stuebner at vrull.eu>
+ */
+
+#include <linux/crypto.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <asm/simd.h>
+#include <asm/vector.h>
+#include <crypto/aes.h>
+#include <crypto/internal/cipher.h>
+#include <crypto/internal/simd.h>
+
+struct aes_key {
+ u8 key[AES_MAX_KEYLENGTH];
+ int rounds;
+};
+
+/* variant using the zvkned vector crypto extension */
+void rv64i_zvkned_encrypt(const u8 *in, u8 *out, const struct aes_key *key);
+void rv64i_zvkned_decrypt(const u8 *in, u8 *out, const struct aes_key *key);
+int rv64i_zvkned_set_encrypt_key(const u8 *userKey, const int bits,
+ struct aes_key *key);
+int rv64i_zvkned_set_decrypt_key(const u8 *userKey, const int bits,
+ struct aes_key *key);
+
+struct riscv_aes_ctx {
+ struct crypto_cipher *fallback;
+ struct aes_key enc_key;
+ struct aes_key dec_key;
+ unsigned int keylen;
+};
+
+static int riscv64_aes_init_zvkned(struct crypto_tfm *tfm)
+{
+ struct riscv_aes_ctx *ctx = crypto_tfm_ctx(tfm);
+ const char *alg = crypto_tfm_alg_name(tfm);
+ struct crypto_cipher *fallback;
+
+ fallback = crypto_alloc_cipher(alg, 0, CRYPTO_ALG_NEED_FALLBACK);
+ if (IS_ERR(fallback)) {
+ printk(KERN_ERR
+ "Failed to allocate transformation for '%s': %ld\n",
+ alg, PTR_ERR(fallback));
+ return PTR_ERR(fallback);
+ }
+
+ crypto_cipher_set_flags(fallback,
+ crypto_cipher_get_flags((struct
+ crypto_cipher *)
+ tfm));
+ ctx->fallback = fallback;
+
+ return 0;
+}
+
+static void riscv_aes_exit(struct crypto_tfm *tfm)
+{
+ struct riscv_aes_ctx *ctx = crypto_tfm_ctx(tfm);
+
+ if (ctx->fallback) {
+ crypto_free_cipher(ctx->fallback);
+ ctx->fallback = NULL;
+ }
+}
+
+static int riscv64_aes_setkey_zvkned(struct crypto_tfm *tfm, const u8 *key,
+ unsigned int keylen)
+{
+ struct riscv_aes_ctx *ctx = crypto_tfm_ctx(tfm);
+ int ret;
+
+ ctx->keylen = keylen;
+
+ if (keylen == 16 || keylen == 32) {
+ kernel_rvv_begin();
+ ret = rv64i_zvkned_set_encrypt_key(key, keylen * 8, &ctx->enc_key);
+ if (ret != 1) {
+ kernel_rvv_end();
+ return -EINVAL;
+ }
+
+ ret = rv64i_zvkned_set_decrypt_key(key, keylen * 8, &ctx->dec_key);
+ kernel_rvv_end();
+ if (ret != 1)
+ return -EINVAL;
+ }
+
+ ret = crypto_cipher_setkey(ctx->fallback, key, keylen);
+
+ return ret ? -EINVAL : 0;
+}
+
+static void riscv64_aes_encrypt_zvkned(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
+{
+ struct riscv_aes_ctx *ctx = crypto_tfm_ctx(tfm);
+
+ if (crypto_simd_usable() && (ctx->keylen == 16 || ctx->keylen == 32)) {
+ kernel_rvv_begin();
+ rv64i_zvkned_encrypt(src, dst, &ctx->enc_key);
+ kernel_rvv_end();
+ } else {
+ crypto_cipher_encrypt_one(ctx->fallback, dst, src);
+ }
+}
+
+static void riscv64_aes_decrypt_zvkned(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
+{
+ struct riscv_aes_ctx *ctx = crypto_tfm_ctx(tfm);
+
+ if (crypto_simd_usable() && (ctx->keylen == 16 || ctx->keylen == 32)) {
+ kernel_rvv_begin();
+ rv64i_zvkned_decrypt(src, dst, &ctx->dec_key);
+ kernel_rvv_end();
+ } else {
+ crypto_cipher_decrypt_one(ctx->fallback, dst, src);
+ }
+}
+
+struct crypto_alg riscv64_aes_zvkned_alg = {
+ .cra_name = "aes",
+ .cra_driver_name = "riscv-aes-zvkned",
+ .cra_module = THIS_MODULE,
+ .cra_priority = 300,
+ .cra_type = NULL,
+ .cra_flags = CRYPTO_ALG_TYPE_CIPHER | CRYPTO_ALG_NEED_FALLBACK,
+ .cra_alignmask = 0,
+ .cra_blocksize = AES_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct riscv_aes_ctx),
+ .cra_init = riscv64_aes_init_zvkned,
+ .cra_exit = riscv_aes_exit,
+ .cra_cipher = {
+ .cia_min_keysize = AES_MIN_KEY_SIZE,
+ .cia_max_keysize = AES_MAX_KEY_SIZE,
+ .cia_setkey = riscv64_aes_setkey_zvkned,
+ .cia_encrypt = riscv64_aes_encrypt_zvkned,
+ .cia_decrypt = riscv64_aes_decrypt_zvkned,
+ },
+};
+
+static int __init riscv_aes_mod_init(void)
+{
+ if (riscv_isa_extension_available(NULL, ZVKNED) &&
+ riscv_vector_vlen() >= 128)
+ return crypto_register_alg(&riscv64_aes_zvkned_alg);
+
+ return 0;
+}
+
+static void __exit riscv_aes_mod_fini(void)
+{
+ if (riscv_isa_extension_available(NULL, ZVKNED) &&
+ riscv_vector_vlen() >= 128)
+ return crypto_unregister_alg(&riscv64_aes_zvkned_alg);
+}
+
+module_init(riscv_aes_mod_init);
+module_exit(riscv_aes_mod_fini);
+
+MODULE_DESCRIPTION("AES (accelerated)");
+MODULE_AUTHOR("Heiko Stuebner <heiko.stuebner at vrull.eu>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS_CRYPTO("aes");
diff --git a/arch/riscv/crypto/aes-riscv64-zvkned.pl b/arch/riscv/crypto/aes-riscv64-zvkned.pl
new file mode 100644
index 000000000000..176588723220
--- /dev/null
+++ b/arch/riscv/crypto/aes-riscv64-zvkned.pl
@@ -0,0 +1,500 @@
+#! /usr/bin/env perl
+# Copyright 2023 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
+
+# - RV64I
+# - RISC-V vector ('V') with VLEN >= 128
+# - RISC-V vector crypto AES extension ('Zvkned')
+
+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 $code=<<___;
+.text
+___
+
+################################################################################
+# int rv64i_zvkned_set_encrypt_key(const unsigned char *userKey, const int bits,
+# AES_KEY *key)
+# int rv64i_zvkned_set_decrypt_key(const unsigned char *userKey, const int bits,
+# AES_KEY *key)
+{
+my ($UKEY,$BITS,$KEYP) = ("a0", "a1", "a2");
+my ($T0,$T1,$T4) = ("t1", "t2", "t4");
+my ($v0, $v1, $v2, $v3, $v4, $v5, $v6,
+ $v7, $v8, $v9, $v10, $v11, $v12,
+ $v13, $v14, $v15, $v16, $v17, $v18,
+ $v19, $v20, $v21, $v22, $v23, $v24,
+) = map("v$_",(0..24));
+
+$code .= <<___;
+.p2align 3
+.globl rv64i_zvkned_set_encrypt_key
+.type rv64i_zvkned_set_encrypt_key,\@function
+rv64i_zvkned_set_encrypt_key:
+ beqz $UKEY, L_fail_m1
+ beqz $KEYP, L_fail_m1
+
+ # Get proper routine for key size
+ li $T0, 256
+ beq $BITS, $T0, L_set_key_256
+ li $T0, 128
+ beq $BITS, $T0, L_set_key_128
+
+ j L_fail_m2
+
+.size rv64i_zvkned_set_encrypt_key,.-rv64i_zvkned_set_encrypt_key
+___
+
+$code .= <<___;
+.p2align 3
+.globl rv64i_zvkned_set_decrypt_key
+.type rv64i_zvkned_set_decrypt_key,\@function
+rv64i_zvkned_set_decrypt_key:
+ beqz $UKEY, L_fail_m1
+ beqz $KEYP, L_fail_m1
+
+ # Get proper routine for key size
+ li $T0, 256
+ beq $BITS, $T0, L_set_key_256
+ li $T0, 128
+ beq $BITS, $T0, L_set_key_128
+
+ j L_fail_m2
+
+.size rv64i_zvkned_set_decrypt_key,.-rv64i_zvkned_set_decrypt_key
+___
+
+$code .= <<___;
+.p2align 3
+L_set_key_128:
+ # Store the number of rounds
+ li $T1, 10
+ sw $T1, 240($KEYP)
+
+ @{[vsetivli__x0_4_e32_m1_ta_ma]}
+
+ # Load the key
+ @{[vle32_v $v10, ($UKEY)]}
+
+ # Generate keys for round 2-11 into registers v11-v20.
+ @{[vaeskf1_vi $v11, $v10, 1]} # v11 <- rk2 (w[ 4, 7])
+ @{[vaeskf1_vi $v12, $v11, 2]} # v12 <- rk3 (w[ 8,11])
+ @{[vaeskf1_vi $v13, $v12, 3]} # v13 <- rk4 (w[12,15])
+ @{[vaeskf1_vi $v14, $v13, 4]} # v14 <- rk5 (w[16,19])
+ @{[vaeskf1_vi $v15, $v14, 5]} # v15 <- rk6 (w[20,23])
+ @{[vaeskf1_vi $v16, $v15, 6]} # v16 <- rk7 (w[24,27])
+ @{[vaeskf1_vi $v17, $v16, 7]} # v17 <- rk8 (w[28,31])
+ @{[vaeskf1_vi $v18, $v17, 8]} # v18 <- rk9 (w[32,35])
+ @{[vaeskf1_vi $v19, $v18, 9]} # v19 <- rk10 (w[36,39])
+ @{[vaeskf1_vi $v20, $v19, 10]} # v20 <- rk11 (w[40,43])
+
+ # Store the round keys
+ @{[vse32_v $v10, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vse32_v $v11, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vse32_v $v12, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vse32_v $v13, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vse32_v $v14, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vse32_v $v15, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vse32_v $v16, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vse32_v $v17, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vse32_v $v18, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vse32_v $v19, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vse32_v $v20, ($KEYP)]}
+
+ li a0, 1
+ ret
+.size L_set_key_128,.-L_set_key_128
+___
+
+$code .= <<___;
+.p2align 3
+L_set_key_256:
+ # Store the number of rounds
+ li $T1, 14
+ sw $T1, 240($KEYP)
+
+ @{[vsetivli__x0_4_e32_m1_ta_ma]}
+
+ # Load the key
+ @{[vle32_v $v10, ($UKEY)]}
+ addi $UKEY, $UKEY, 16
+ @{[vle32_v $v11, ($UKEY)]}
+
+ @{[vmv_v_v $v12, $v10]}
+ @{[vaeskf2_vi $v12, $v11, 1]}
+ @{[vmv_v_v $v13, $v11]}
+ @{[vaeskf2_vi $v13, $v12, 2]}
+ @{[vmv_v_v $v14, $v12]}
+ @{[vaeskf2_vi $v14, $v13, 3]}
+ @{[vmv_v_v $v15, $v13]}
+ @{[vaeskf2_vi $v15, $v14, 4]}
+ @{[vmv_v_v $v16, $v14]}
+ @{[vaeskf2_vi $v16, $v15, 5]}
+ @{[vmv_v_v $v17, $v15]}
+ @{[vaeskf2_vi $v17, $v16, 6]}
+ @{[vmv_v_v $v18, $v16]}
+ @{[vaeskf2_vi $v18, $v17, 7]}
+ @{[vmv_v_v $v19, $v17]}
+ @{[vaeskf2_vi $v19, $v18, 8]}
+ @{[vmv_v_v $v20, $v18]}
+ @{[vaeskf2_vi $v20, $v19, 9]}
+ @{[vmv_v_v $v21, $v19]}
+ @{[vaeskf2_vi $v21, $v20, 10]}
+ @{[vmv_v_v $v22, $v20]}
+ @{[vaeskf2_vi $v22, $v21, 11]}
+ @{[vmv_v_v $v23, $v21]}
+ @{[vaeskf2_vi $v23, $v22, 12]}
+ @{[vmv_v_v $v24, $v22]}
+ @{[vaeskf2_vi $v24, $v23, 13]}
+
+ @{[vse32_v $v10, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vse32_v $v11, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vse32_v $v12, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vse32_v $v13, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vse32_v $v14, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vse32_v $v15, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vse32_v $v16, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vse32_v $v17, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vse32_v $v18, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vse32_v $v19, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vse32_v $v20, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vse32_v $v21, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vse32_v $v22, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vse32_v $v23, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vse32_v $v24, ($KEYP)]}
+
+ li a0, 1
+ ret
+.size L_set_key_256,.-L_set_key_256
+___
+}
+
+################################################################################
+# void rv64i_zvkned_encrypt(const unsigned char *in, unsigned char *out,
+# const AES_KEY *key);
+{
+my ($INP,$OUTP,$KEYP) = ("a0", "a1", "a2");
+my ($T0,$T1, $rounds, $T6) = ("a3", "a4", "t5", "t6");
+my ($v0, $v1, $v2, $v3, $v4, $v5, $v6,
+ $v7, $v8, $v9, $v10, $v11, $v12,
+ $v13, $v14, $v15, $v16, $v17, $v18,
+ $v19, $v20, $v21, $v22, $v23, $v24,
+) = map("v$_",(0..24));
+
+$code .= <<___;
+.p2align 3
+.globl rv64i_zvkned_encrypt
+.type rv64i_zvkned_encrypt,\@function
+rv64i_zvkned_encrypt:
+ # Load number of rounds
+ lwu $rounds, 240($KEYP)
+
+ # Get proper routine for key size
+ li $T6, 14
+ beq $rounds, $T6, L_enc_256
+ li $T6, 10
+ beq $rounds, $T6, L_enc_128
+
+ j L_fail_m2
+.size rv64i_zvkned_encrypt,.-rv64i_zvkned_encrypt
+___
+
+$code .= <<___;
+.p2align 3
+L_enc_128:
+ @{[vsetivli__x0_4_e32_m1_ta_ma]}
+
+ @{[vle32_v $v10, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v11, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v12, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v13, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v14, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v15, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v16, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v17, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v18, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v19, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v20, ($KEYP)]}
+
+ @{[vle32_v $v1, ($INP)]}
+
+ @{[vaesz_vs $v1, $v10]} # with round key w[ 0, 3]
+ @{[vaesem_vs $v1, $v11]} # with round key w[ 4, 7]
+ @{[vaesem_vs $v1, $v12]} # with round key w[ 8,11]
+ @{[vaesem_vs $v1, $v13]} # with round key w[12,15]
+ @{[vaesem_vs $v1, $v14]} # with round key w[16,19]
+ @{[vaesem_vs $v1, $v15]} # with round key w[20,23]
+ @{[vaesem_vs $v1, $v16]} # with round key w[24,27]
+ @{[vaesem_vs $v1, $v17]} # with round key w[28,31]
+ @{[vaesem_vs $v1, $v18]} # with round key w[32,35]
+ @{[vaesem_vs $v1, $v19]} # with round key w[36,39]
+ @{[vaesef_vs $v1, $v20]} # with round key w[40,43]
+
+ @{[vse32_v $v1, ($OUTP)]}
+
+ ret
+.size L_enc_128,.-L_enc_128
+___
+
+$code .= <<___;
+.p2align 3
+L_enc_256:
+ @{[vsetivli__x0_4_e32_m1_ta_ma]}
+
+ @{[vle32_v $v10, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v11, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v12, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v13, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v14, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v15, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v16, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v17, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v18, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v19, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v20, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v21, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v22, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v23, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v24, ($KEYP)]}
+
+ @{[vle32_v $v1, ($INP)]}
+
+ @{[vaesz_vs $v1, $v10]} # with round key w[ 0, 3]
+ @{[vaesem_vs $v1, $v11]}
+ @{[vaesem_vs $v1, $v12]}
+ @{[vaesem_vs $v1, $v13]}
+ @{[vaesem_vs $v1, $v14]}
+ @{[vaesem_vs $v1, $v15]}
+ @{[vaesem_vs $v1, $v16]}
+ @{[vaesem_vs $v1, $v17]}
+ @{[vaesem_vs $v1, $v18]}
+ @{[vaesem_vs $v1, $v19]}
+ @{[vaesem_vs $v1, $v20]}
+ @{[vaesem_vs $v1, $v21]}
+ @{[vaesem_vs $v1, $v22]}
+ @{[vaesem_vs $v1, $v23]}
+ @{[vaesef_vs $v1, $v24]}
+
+ @{[vse32_v $v1, ($OUTP)]}
+ ret
+.size L_enc_256,.-L_enc_256
+___
+}
+
+################################################################################
+# void rv64i_zvkned_decrypt(const unsigned char *in, unsigned char *out,
+# const AES_KEY *key);
+{
+my ($INP,$OUTP,$KEYP) = ("a0", "a1", "a2");
+my ($T0,$T1, $rounds, $T6) = ("a3", "a4", "t5", "t6");
+my ($v0, $v1, $v2, $v3, $v4, $v5, $v6,
+ $v7, $v8, $v9, $v10, $v11, $v12,
+ $v13, $v14, $v15, $v16, $v17, $v18,
+ $v19, $v20, $v21, $v22, $v23, $v24,
+) = map("v$_",(0..24));
+
+$code .= <<___;
+.p2align 3
+.globl rv64i_zvkned_decrypt
+.type rv64i_zvkned_decrypt,\@function
+rv64i_zvkned_decrypt:
+ # Load number of rounds
+ lwu $rounds, 240($KEYP)
+
+ # Get proper routine for key size
+ li $T6, 14
+ beq $rounds, $T6, L_dec_256
+ li $T6, 10
+ beq $rounds, $T6, L_dec_128
+
+ j L_fail_m2
+.size rv64i_zvkned_decrypt,.-rv64i_zvkned_decrypt
+___
+
+$code .= <<___;
+.p2align 3
+L_dec_128:
+ @{[vsetivli__x0_4_e32_m1_ta_ma]}
+
+ @{[vle32_v $v10, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v11, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v12, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v13, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v14, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v15, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v16, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v17, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v18, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v19, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v20, ($KEYP)]}
+
+ @{[vle32_v $v1, ($INP)]}
+
+ @{[vaesz_vs $v1, $v20]} # with round key w[43,47]
+ @{[vaesdm_vs $v1, $v19]} # with round key w[36,39]
+ @{[vaesdm_vs $v1, $v18]} # with round key w[32,35]
+ @{[vaesdm_vs $v1, $v17]} # with round key w[28,31]
+ @{[vaesdm_vs $v1, $v16]} # with round key w[24,27]
+ @{[vaesdm_vs $v1, $v15]} # with round key w[20,23]
+ @{[vaesdm_vs $v1, $v14]} # with round key w[16,19]
+ @{[vaesdm_vs $v1, $v13]} # with round key w[12,15]
+ @{[vaesdm_vs $v1, $v12]} # with round key w[ 8,11]
+ @{[vaesdm_vs $v1, $v11]} # with round key w[ 4, 7]
+ @{[vaesdf_vs $v1, $v10]} # with round key w[ 0, 3]
+
+ @{[vse32_v $v1, ($OUTP)]}
+
+ ret
+.size L_dec_128,.-L_dec_128
+___
+
+$code .= <<___;
+.p2align 3
+L_dec_256:
+ @{[vsetivli__x0_4_e32_m1_ta_ma]}
+
+ @{[vle32_v $v10, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v11, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v12, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v13, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v14, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v15, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v16, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v17, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v18, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v19, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v20, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v21, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v22, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v23, ($KEYP)]}
+ addi $KEYP, $KEYP, 16
+ @{[vle32_v $v24, ($KEYP)]}
+
+ @{[vle32_v $v1, ($INP)]}
+
+ @{[vaesz_vs $v1, $v24]} # with round key w[56,59]
+ @{[vaesdm_vs $v1, $v23]} # with round key w[52,55]
+ @{[vaesdm_vs $v1, $v22]} # with round key w[48,51]
+ @{[vaesdm_vs $v1, $v21]} # with round key w[44,47]
+ @{[vaesdm_vs $v1, $v20]} # with round key w[40,43]
+ @{[vaesdm_vs $v1, $v19]} # with round key w[36,39]
+ @{[vaesdm_vs $v1, $v18]} # with round key w[32,35]
+ @{[vaesdm_vs $v1, $v17]} # with round key w[28,31]
+ @{[vaesdm_vs $v1, $v16]} # with round key w[24,27]
+ @{[vaesdm_vs $v1, $v15]} # with round key w[20,23]
+ @{[vaesdm_vs $v1, $v14]} # with round key w[16,19]
+ @{[vaesdm_vs $v1, $v13]} # with round key w[12,15]
+ @{[vaesdm_vs $v1, $v12]} # with round key w[ 8,11]
+ @{[vaesdm_vs $v1, $v11]} # with round key w[ 4, 7]
+ @{[vaesdf_vs $v1, $v10]} # with round key w[ 0, 3]
+
+ @{[vse32_v $v1, ($OUTP)]}
+
+ ret
+.size L_dec_256,.-L_dec_256
+___
+}
+
+$code .= <<___;
+L_fail_m1:
+ li a0, -1
+ ret
+.size L_fail_m1,.-L_fail_m1
+
+L_fail_m2:
+ li a0, -2
+ ret
+.size L_fail_m2,.-L_fail_m2
+___
+
+print $code;
+
+close STDOUT or die "error closing STDOUT: $!";
--
2.39.0
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